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SKYTRON Elite 6000 O/R Table Service Manual

1. 43 6 11 Motor PUMP ASSEmMDI aem 44 SECTION VII 6001NB BATTERY MODEL ELECTRICAL TROUBLESHOOTING 46 715 c 46 2 Tro bleshooting 46 REM nr 48 7 4 sug 48 7 5 Battery Charging 49 750 SWitch Over Relay c rL 50 Jy P ndant Conil ess esses 51 7 8 Auxiliary SWitCnes feb au vee tat Ced a ae ep cerae us 53 7 8 gt Relay BOK EE 54 7 10 Main Wire Harness Continuity Tests 56 PENA ET E 57 7 12 Motor Pump Assembly cans Ua cu bei t eus tentus 58 SECTION VIII ELECTRICAL SYSTEM ADJUSTMENTS 60 8 1 Relay Box Adjustments Models 6001N amp 6001NB 60 8 2 Relay Box Adjustments Model 6001B enr ic See bee te Creer e ei eu uta 61 SECTION HYDRAULIC SYSTEM 1 1 General Electro Hydraulic System The hydraulic system with the exception of the hydraulic cylinders and hoses is contained within the base of the table The hydraulic valves and pump are electrically controlled by the use of a hand held push button pendant control The power requirements for the table are 120 VAC 5 amp 60 Hz T
2. 23 Sisi cp 23 4 3 Battery Model Components e eet 23 SECTION V ELECTRICAL SYSTEM 24 S t Troubleshooting NOI6S cu leute telam ud 24 5 27 sui e desi 24 5 3 Pendant COMMON e m 26 Sm Mai Bo n em 27 5 5 29 5 6 Motor Pulmp ASSOITIDIV dE 31 5 7 Return To Level Micro SWIICh6S s d Fen ete A E Cd lex etn Lees eti 32A 5 8 22 2266 32A SECTION 6001B BATTERY MODEL ELECTRICAL TROUBLESHOOTING 33 Gelb 34 6 2 Troubleshooting Notes oi 34 6 3 I EL rete a 25 6 4 Batteries MC e 35 6 5 Battery Charging BOX eddie ee aire Redes Ur pae n erat 36 6 5 Pendant Control Mot cach ake 37 0 7 Switche s mt oa oca ic llus ou 39 5 5 Relay BOX ec 40 6 9 Main Wire Harness Continuity 41
3. iii ii Hj E n i ER 20 5 5 78 d di E E 15 E Hi T 2 2370 24 37 32 32 32 5 7 47947174 7 E 3 2 al 1 zl ly EB e b i E b E S i 82 Ys OO BOO 90 GO GCE GO OO OO 0909 Om 3 a in ER e dta a 41 a Wiring Diagram Model 6001KB Page 65 RL22 RL 9 RLS RL 14 LEER x Fi 15 4 RL 37 RL 3O ie MNPC cui pa 1 2 me 15 COOCOO OOO RUST Model 6001NB iagram D iring Page 66
4. INLET OUTLET Figure 1 7 Mini Valve Right Port Activated 1 Spool Valve Pushed to the left by electric solenoid This opens the internal oil pressure gal ley allowing the fluid to go through the check valve and on to the cylinder Also the spool valve opens the oil return line providing an oil path through the internal oil galley back to the reservoir 2 Pilot Plunger Valve Left pilot plunger valve is pushed up by the incoming oil pressure mechani cally opening the check valve located above it in the return circuit This action allows the oil from the left side of the slave cylinder to go back into the reservoir The right pilot plunger valve is not affected in this operation mode 3 Check Valves Both check valves are opened in this operation mode The right check valve is pushed open by the oil pressure created by the pump The oil then continues to go through the lines and pushes the slave cylinder piston to the left At the same time the left check valve is held open mechanically by the pilot plunger providing a return path for the oil through the mini valve back to the reservoir 4 Speed Adjustment The right speed control output side does not have any effect in this operation mode because the oil is routed around the speed adjustment through a by pass valve and then to the output port The left speed adjustment control
5. ren JX J FFTs oR OF Bg Y 7 N 5000 36th Street S E Grand Rapids 49512 1 800 SKYTRON or 1 616 957 0500 FAX 1 616 957 5053
6. The power supply is directly connected to the relay contacts When these contacts are closed 24 volts is supplied to the solenoids which are mounted on the hydraulic mini valves One relay is used to supply power to the pump motor and is always activated no matter what control function is se lected The brake locking circuit relay is also activated when any control function other than BRAKE UNLOCK is initially selected The following tests will determine if the relay box is functioning correctly a Checking Relay Box Input Power 1 Plug the power cord into the 120VAC supply wall receptacle Disconnect connector CN4 leave all other connectors connected 2 Using a DC voltmeter test input power for both the BATTERY and AC120V operating modes See figure 6 14 Meter should read approximately 24 28 volts in BATTERY mode and 26 511 volts in AC120V mode BATTERY mode AC120V mode 1 5 2 6 Connector CN4 Color Code Pin 1 White Pin 5 Yellow Pin 2 Black Pin 6 Black Pin 3 Red Pin 7 Blue Pin 4 Blue Figure 6 14 Relay Box Input b Test Results If you do not receive the correct meter readings the problem is in the input wiring connectors or Page 40 components If the correct readings are obtained proceed to the next step c Checking Output to Pump 1 Connect all connectors and activate either BATTERY or AC120V operating mode 2 Test CN4 at pin 3 and pin 4 wi
7. Figure 5 15 Lateral Tilt Return Switches Page32C H amp 5 Back Section Down Test at pins 5 amp 14 Table Switch Meter Position Position Reading When the Back Section is Down NS 5 brings the Back Section Up to level RISER CORD m qmm m ee Sera cece Snes NS 6 Back Section Up Tast at pins 6 amp 14 Infinity Infinity Closed 0 When the Back Section is Up NS 6 brings the Back Section Down te level Figure 5 16 Back Section Return Switches b Switch Adjustment If proper readings are not obtained during test or if table does not properly return to level use the following procedure to adjust the switches 1 Apply table brakes and using a level level the table top using the TRENDELENBURG and LATERAL TILT function buttons on the pendant control 2 Carefully loosen the switch retaining screws and adjust the switches as needed See figure 5 17 Page 32D RETAINING SCREWS MICROSWITCH Figure 5 17 Micro Switch Adjustment 6001 SECTION VI 6001 BATTERY MODEL ELECTRICAL TROUBLESHOOTING oo PENDANT O O CONTROL L3 L3 L m oo oo AUXILIARY SWITCHES PUMP 24vDC POWER BOX THERMAL RELAY u SWITCH FUSE PLATE RECHAREGING POWER CORD Figure 6 1 Electrical Circuit Block Diagram Model 6001B Page 33 6001 6 1 General The battery table components operate
8. fine wire or a paper clip may be needed to accurately test the small sockets in the connector The connec toris low voltage and there is no danger of electrical shock To make sure all operating modes are OFF connect the pendant control turn AC120V power OFF atthe main switch wait approximately 5 seconds to make sure BATTERY operating mode is not activated and disconnect the pendant control 2 With the AC120V and BATTERY operating modes in the OFF position test connector CN13 at pin 1 and pins 2 through 16 Meter should 6001NB read OVDC Test at pin 21 and 22 meter should read 24 28VDC 3 With AC120V power ON Main Power Switch activated test connector CN13 at pin 1 and pins 3 through 16 Meter should read 5 6VDC 4 Activate BATTERY operating mode by switching Main Power Switch OFF and momen tarily placing a jumper wire between pin 21 and pin 22 Test pin 1 and pins 2 through 16 Meter should read OVDC for pin 3 5 6VDC for pins 2 and 4 through 16 Figure 7 19 Table Base Connector CN13 e Test Results If you do not receive the correct meter readings the relay box or wiring is defective Test appropriate wires and connectors as necessary If the correct readings are obtained this part of the relay box is okay Proceed to the next step f Checking Output to Solenoids This test checks the voltage that is used to energize the solenoids 1 Activate either BATTERY or AC120V
9. REAR PIVOT BLOCK O RING TAIL CYLINDER HEAD UP CIRCUIT INTERMAL OIL FROM PUMP INTERNAL OIL RETURN TO RESERVOIR Figure 3 2 Trendelenburg Circuit Page 16 3 5 LATERAL TILT DIAGNOSIS CHART Problem Reason Lateral tilt function moves improperly Incorrect Speed Adjustment Spool Valve Not Centered Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Bad Solenoid Defective Relay Box or Pendant Control Lateral tilt function chatters or loses position Defective or Dirty Check Valves Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil REAR PIVOT BLOCK e CYLINDER HOUSING PISTON O RING CYLINDER CAP LEFT TIL T FLEXIBLE HOSES PLUMBING i COPPER LINE TERMINAL i E T RIGHT TILT SPEED GOHTROL INTERNAL OIL FROM PUMP INTERNAL OIL RETURN TO RESERVOIR MIMI VALVE 7 Figure 3 3 Lateral Tilt Circuit Page 17 3 6 FLEX SYSTEM DIAGNOSIS CHART Problem Back Section or Trendelenburg function moves improperly IMPORTANT If Flex System does not function prop erly check the back section and tren delenburg functions before adjusting the flex system Back Section or Trendelenburg function chatters or loses position TREND CIRCUIT THENDELENBURG MINL VALWE CHECK VALVE SPEED CONTROL MIMI VALVE INTERNAL OIL FROM PUMP PLUMBING TERMINAL Reason In
10. 5 LAT TILT RIGHT Figure 3 11 Pivot Block Hoses Figure 3 12 shows the placement and number code for the long flexible hoses that connect from the elevation clamp ring to the plumbing terminal 6 BACK SECTION DOWN 8 LEG UP TOP VIEW 9 LEG DOWH FRONT 7 BACK d PIVOT BLOCK SECTION UP Figure 3 12 Elevation Clamp Ring Hoses SECTION IV ELECTRICAL SYSTEM 4 1 General The complete electrical system with the excep tion of the hand held pendant control and the return circuit micro switches is contained within the base of the table The pump motor and the hydraulic valves are controlled electrically with the pendant control The electrically operated functions are as follows ELEVATION Up and Down TRENDELENBURG Head up and down LATERAL TILT Right and left BACK SECTION Up and Down LEG SECTION Up and Down FLEX REFLEX RETURN TO LEVEL BRAKE UNLOCK Brake release The power requirements are 120 VAC 60 Hz fuse protected The main power on off switch is an enclosed DPST type and the power cord is a three wire fifteen foot long UL listed cord with a three prong hospital grade plug 4 2 Components Refer to figure 4 1 for the relationship of the elec trical components a Wires Connectors Switches Fuse These provide the path for the various electrical circuits b Relay Box Contains the step down trans former full wave rectifier and relay switches The
11. Es KI A JERN A A A ACI ELITE SERIES SURGICAL TABLES MAINTENANCE MANUAL MODEL ELITE 6000N 6001N AND ALL BATTERY MODELS Table of Contents SEGTION I HYDRAULIC SYSTEM 1 E EET EIE EE E E AE E 1 1 2 Component 3 Molot P mp Operation Etui ecd 3 b Pressure Relief Valve c qe ach 3 Ungu 4 d Mini valve in Neutral Position rere re ee E aetna 4 e Mini Valve Right Port Activated Dome mr oe M 5 Mini Valve Left Port Activated eis s ma NER Qon 5 g Hydraulic Cylinders Slave Cylinders sseseeeecesseseeeneeeeenneneenenenn nnn 6 h Elevation Cylinder Return Circuit be pee ibt poured 7 Brake a 8 j Emergency Brake 9 k Fl xeflex System eee od tede ederet Rd 9 1 3 Hydraulic AC USUMCIIS s ooo ooo ER itta Se 10 NN 10 b Bleeding The Hydraulic System 2 eir 10 Pressure Relief Valve 10 Speed Controls rS 10 SECTION MECHANICAL TABLE ADJUSTMENTS eese nme 12 2 1 Back Section Gear Mesh Adjustment lt era
12. Does the problem affect only one control function 3 If the problem affects one control function is itin both directions 4 Is the problem intermittent 5 15 the problem no movement of a table surface or does the table surface lose position Page 14 Oncethe problem has been determined concen trate on that particular hydraulic circuit or control function Listed below are the hydraulic components that are common with all hydraulic circuits If there is a problem with any of them it could affect all control functions 1 Motor Pump Assembly 2 Reservoir 3 Pressure Relief Valve 4 Certain Oil Lines and Galleys Ifthere was a problem in the following components only one control function would normally be af fected 1 Mini Valve 2 Slave Oylinder 3 Lines NOTE Whenever a hydraulic line or compo nentis replaced bleed the air out of the lines using the pump pressure before making the final connection After all connections are tight cycle the control function back and forth two or three times to purge the remaining air from the system IMPORTANT When installing new O rings use hy draulic oil to thoroughly lubricate the O rings and cylinder Keep every thing clean Each complete oil circuit is shown on the following pages When troubleshooting a particular function refer to the appropriate oil circuit diagram and the list of possible problems 3 3 ELEVATION DIAGNOSIS CHART Problem
13. See figure 5 3 3 Ohmmeter must show continuity between the pins that are indicated when the appropriate buttons are pressed NOTE Pins 2 and 3 are connected to the LED power on light on the pendant control and cannot be checked with an ohm meter Pin 19 is used on KR models only Pins 17 amp 18 are not used COMMON TABLE UP TABLE UF TABLE TABLE DH REV TREND REV TREND TREND Ls TREND 7 BACK BACK UP _ BACK DOWN BACK DOWN 9 TILT LEFT i TILT LEFT TILT RIGHT TILT RIGHT o LEG im LEG LEG GOWN D LEG GOWN D FLEX REFLEX BRAKE STANDARD KR Figure 5 3 Pendant Control Test Page 26 b Test Results If you do not receive continuity between any of the pins either the micro switch in the Pendant Control is defective or a wire is broken Either of these problems can be repaired easily If you receive correct readings with the meter the Pendant Control is okay c Wiring Harness Test The following test checks the wires leading from the relay box connector 8 to the 19 pin connec tor table socket These wires apply low voltage to the pendant control buttons 1 The power cord should be plugged into the wall socket and the main switch turned ON 2 Disconnect the pendant control from the base connector All other connectors should be connected 3 Use a DC voltmeter 10V scale and measure the following pin
14. TRENDELENBURG SECTION LEG SECTION 6001 ONLY Um TILT T ELEVATION on Mf naio CAEN 72727 gt EMERGENCY E13 709 BRAKE RELEASE MINI E ai NI INSA SN m ion nuages LI UL Em OIL RESERVOIR MOTOR PUMP ASSEMBLY Figure 1 2 Hydraulic Block Diagram Model 6001N Page 2 1 2 Component Operation a Motor Pump Operation The motor pump assembly is a gear type pump that provides the oil pressure and volume for the entire hydraulic system The pump has an inlet side and an outlet side The inlet side is connected to the reservoir which provides the oil supply The reservoir has a very fine mesh screen strainer which prevents foreign material from entering the oil system The outputline of the pumpis connected to the main oil galley which is internal and common to all the hydraulic mini valves and pressure relief valve Also common to the hydraulic mini valves and pressure relief valve is an oil galley that internally connects to the oil reservoir to provide a return path for the hydraulic oil See figure 1 3 MAIN RETURN PUMP MAIN PRESSURE OIL GALLEY OUTLET OIL GALLEY INTERNAL INTERNAL MOTOR PUMP PRESSURE ASSEMBLY _ RELIEF VALVE PUMP INLET 1 3 Pressure Relief Valve This device provides an alternate oil path when the hydraulic cylinders reach the end of their stroke and the pump continues to run If this path were n
15. replaced NOTE Before deciding the relay box is de fective check the wires and pins in the connector blocks to make sure they are not loose or making a bad connection with their mate 5 5 Solenoids The solenoids are energized by 120 volt potential that is controlled by the relays located inside the relay box The solenoid windings are protected from exces sive heat with an internal thermal fuse that will open after approximately seven 7 minutes of continu ous operation The solenoid must be replaced if the internal thermal fuse has been blown The solenoids are mounted directly on either side of the hydraulic mini valves and push the spool valve in one direction or the other depending upon which solenoid is activated a Solenoid Test Thefollowing tests check the voltage applied to the solenoids and the resistance of the solenoid coil NOTE Ifa solenoid does not function when the pendant control button is pushed the problem could be the pendant control the relay box or the solenoid NOTE Each solenoid is controlled with 120V source coming from the relay box This source can easily be checked by mea suring the voltage at the 2 pin connec tor in question CAUTION Line voltage will be measured in this test Do nottouch uninsulated connec tor pins or meter test leads b Step 1 1 Plug the table cord into the wall receptacle and turn main switch ON 2 Disconnect the 2 pin connector from the s
16. 4 Speed Adjustment The left speed control output side does not have any effect in this oper ation mode because the oil is routed around the speed adjustment through a by pass valve and then to the output port The right speed adjustment controls the speed of the table function by restrict ing the amount of oil going back to the reservoir Page5 9 Hydraulic Cylinders Slave Cylinders There are several different types of hydraulic cylin ders used in the table that activate the control functions With the exception of the elevation and brake cylinders all operate basically the same way The control functions are listed below See figure 1 9 Back Section 2 double action cylinders Leg Section 2 double action cylinders Trendelenburg 1 double action cylinder Lateral Tilt 1 double action cylinder Elevation 1 single action cylinder Brakes 4 single action cylinders BACK SECTION CYLINDER TRENDELENBURG CYLINDER ry i on ee LEG SECTION CYLINDER LATERAL TILT CYLINDER ELEVATION CYLINDER Figure 1 9 Cylinder Placement 1 Back Section and Leg Section Cylinders The double action cylinders are closed at one end and have a movable piston with hydraulic fluid on both sides Connected to this piston is a ram or shaft that exits out of the other end of the cylinder Through the use of either a gear or clevis and pin arrangement this ram is connected to a movable table surface The
17. 7 17 Meter should read 0 ohms If the switches check out the problem would have to be in the wires or connector 9 Figure 7 17 Auxiliary Switch Test La FT e MA LAJEA 25 13A 1 1 14 78 THEA 18 68 Fai irma 1888 soria 21014 go 24126 213A EE Yellow Brirem hie Grange Auxiliary Switch Connector CN9 Page 53 6001 7 9 Relay power supply is directly connected to the relay contacts When these contacts are closed 24 volts is supplied to the solenoids which are mounted on the hydraulic mini valves One relay is used to supply power to the pump motor and is always activated no matter what control function is se lected The brake locking circuit relay is also activated when any control function other than BRAKE UNLOCK is initially selected Also inside the 6001NB relay box is a step down transformer and full wave rectifier which decreases the voltage to 5 6 volts This low voltage potential controls the relays by the use of the hand held pendant control buttons Basically the relays en able a 5 6 volt potential to control the 24 volt circuit The following tests will determine if the relay box is functioning correctly a Checking Relay Box Input Power 1 Plug the power cordinto the 120VAC supply wall receptacl
18. AC120V power ON use a DC voltme terto test pin 3 and pin 4 of CN12 DO NOT disconnect connector CN12 See figure 6 6 3 Meter should read 26 5 1VDC Page 36 Figure 6 6 Connector CN12 Test 4 Test pin 5 and pin 6 of CN12 with DC voltmeter to test operation of CHARGING indicator light next to power cord connector 5 Meter should read approximately 26 5 VDC if charger is operating If batteries are fully charged there will be under 5 volts at pins 5 and 6 b Test Results If you do not receive the correct readings the charger or the transformer may be defective c Charging System Output Adjustment If output reading at pins and 4 is not 26 5 1VDC the output can be adjusted at the variable resistor VR R59 on the circuit board inside the Charging Box See figure 6 7 Turn the adjuster clockwise to decrease the voltage Counterclockwise to increase the voltage NOTE The battery connector CN16 must be disconnected to adjust the battery charger output Figure 6 7 6001 6 6 Pendant Control The Pendant Control consists of 14 micro switches buttons When any ofthe circuits are completed by depressing a function button the appropriate relay contacts located in the relay box close and a 24V potential is applied to the solenoid to operate the hydraulic mini valve The 6001B Pendant Control has 24 volts applied to it a Pendant Control Test The following test will determine if the m
19. AZ 120 120 Figure 5 10 Connector CN15 c Test Results If you do notreceive the correct meter readings the problem could be in the wires connectors relay box or main switch refer to appropriate section for troubleshooting If the correct voltage is obtained everything is good up to that point and the problem could be either the motor or the starting capacitor d Step 2 If the starting capacitor is shorted or grounded the motor will not run Capacitors very seldom fail and it requires a dielectric tester to accurately test one However an ohmmeter can be used to determine if the capacitor will store a low voltage charge and most of the time this is adequate 1 Turn the main switch OFF 2 Connector CN15 should be disconnected 3 Use the R x 100 scale of the ohmmeter and touch pins 2 and 3 of connector CN15 See figure 5 10 e Test Results The meter needle should move up scale and then back down to infinity This would indicate that the capacitor is storing an electrical charge Page 31 capacitor have to be dis charged first by shorting pins 2 and 3 OHM together before you will be able to see the ohmmeter needle swing up the scale f Step 3 METER The motor windings can be statically checked for Approx 5 ohms j j Approx 4 ohms resistance using an ohmmeter Approx 8 ohms 1 Turn main power switch OFF Figure 5 11 Pump Connector CN1
20. DC voltmeter measure the voltage between pin 1 and pins 4 through 19 of the table base connector See figure 5 4 Meter should read 5 6 volts Page 28 d Test Results If you do not receive the correct meter readings the relay box or wiring is defective the correct readings are obtained this part of the relay box is okay Proceed to the next step e Relay Box Output Connectors CN6 amp CN7 This test checks the high voltage 120V that is used to energize the solenoids CAUTION 120 VAC will be measured in this test Do not touch uninsulated connector pins or meter test leads 1 The power cord should be plugged into the wall receptacle and main switch turned ON 2 Disconnect the motor connector CN15 All other connectors should be connected Test con nectors CN6 and CN7 from the back while attached to the relay box 3 Activate each of the Pendant Control but tons and using an AC voltmeter capable of measur ing 120VAC measure the voltage between the appropriate connector pins located in connector CN6 or CN7 See figure 5 7 Polarity of meter test leads is notimportant Meter should read 120VAC CNG CN Tobie Up Leg Lip Table Down E Fee Tran Brake Set Trend Brake Uniock Back Back Gown Tilt Right Tik Lat Figure 5 7 Relay Box Output Connectors CN6 and CN7 f Test Results If you do notreceive the correct meter readings the relay box or wiring is defective and should be
21. EMERGENCY BRAKE RELEASE SPEED CONTROL INTERNAL OIL BRAKE RELEASE LEVER FROM PUMP CYLINDER INTERNAL OIL RETURN TO RESERVOIR Figure 3 7 Brake System Circuit Page 21 3 10 Flexible Hose Identification and Placement The following figures will show the correct place ment of the flexible hydraulic hoses used in the table and their respective number codes Figure 3 8 shows the hose connections to the plumbing terminal 2040 6080 10 30 50 70 90 Figure 3 8 Plumbing Terminal Figure 3 9 shows the placement of the short flex ible hoses which connect to the back section cylinders BACK CYLINDER RAM RIGHT BACK CYLINDER RAM LEFT TOP VIEW CYLINDER PISTON RIGHT BACK CYLINDER PISTON LEFT Figure 3 9 Back Section Hoses Figure 3 10 shows the placement of the short flexible hoses which connect to the leg section cylinders Page 22 LEG CYLINDER PISTON LEFT a 886 LEG CYLINDER PISTON RIGHT TOP VIEW FRONT m PIVOT BLOCK LEG CYLIMDER RAM RIGHT LEG CYLINDER RAM LEFT Figure 3 10 Leg Section Hoses Figure 3 11 shows the placement and number code for the long flexible hoses which connect from the plumbing terminal to the front and rear pivot blocks NOTE The number codes will be stamped into the elevation clamp ring and the plumb ing terminal 3 TREND CH LAT TILT LEFT TOP VIEW REAR PIVOT FRONT PLOCK PIVOT BLOCK 2 REV TREND
22. Reason Table will not elevate properly Pressure Relief Valve Not Set Properly Low on Oil Spool Valve Not Centered Defective Pump Defective Mini Valve Defective Solenoid or Wiring Defective Relay Box or Pendant Control Table will not descend properly Incorrect Speed Adjustment Bad Check Valve Spool Valve Not Centered Galled Slider Assembly Defective Solenoid or Wiring Defective Relay Box or Pendant Control Table loses elevation Bad Check Valve Leaking Mini Valve Loose Fittings Joints Hoses Leaking O Ring Inside Cylinder PISTON O RING CYLINDER BASE COPPER CYLINDER BASE PLUMBING a j ELEVATION MINI VALVE INTERNAL OIL FROM PUMP INTERNAL OIL RETURN TO RESERVOIR Figure 3 1 Elevation Circuit Page 15 3 4 TRENDELENBURG DIAGNOSIS CHART Problem Trendelenburg function moves improperly Trendelenburg function chatters or loses position PINION GEAR FRONT PIVOT BLOCK PISTON ASSEMBLY HEAD CYLINDER CAP HEAD DOWN CIRCUIT PLUMBING TERMINAL LINES CHECK VALVE FLEXIBLE HOSES Reason Incorrect Speed Adjustment Spool Valve Not Centered Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Bad Solenoid or Wiring Defective Relay Box or Pendant Control Defective or Dirty Check Valve Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil
23. To compensate for non level floors some early tables were equipped with adjustable brake feet Thetwo adjustable brake feet arelocated as shown in figure 2 5 To adjustthe feet activate the brake system until the brakes are completely set Insert a 7 32 pin punch into the access hole on the adjustable foot requiring adjustment and rotate the foot as needed See figure 2 5 BRAKE CYLINDER 43 FRICTION ADJUSTMENT SCREW TIGHTEN IF FOOT ROTATES TOO FREELY PUNCH Figure 2 5 Adjustable Brake Feet Page 13 SECTION HYDRAULIC TROUBLESHOOTING 3 1 Precautions Before attempting to troubleshoot any hydraulic problem on the table please read through the pre cautions and notes below CAUTION When disconnecting any of the hydrau lic lines fittings joints hoses etc for the following control functions be sure these table surfaces are in their down position or completely supported Elevation Back Section Leg Section When working on the trendelenburg or lateral tilt hydraulic circuits be sure to support the table top When working on the brake system make sure the brakes are completely retracted CAUTION Failure to follow these precautions may result in an uncontrolled oil spray and damage to the table or personal injury 3 2 Troubleshooting Notes When troubleshooting a table malfunction first determine the following 1 Does the problem affect all control func tions 2
24. activates the Switch Over Relay The relay then supplies the AC operating mode output power to the relay box and also activates the battery charging circuit See figure 7 10 NOTE The battery charging circuit is only op erational when the table is in the AC120V operating mode RELAY BOX RELAY BOX SIGNAL OUT 5 0 RELAY CHARGING BOX Figure 7 10 Relay in Activated Position c Switch Over Relay Test Using a DC voltmeter test the operation of the relay in both the OFF AC120V OFF and Acti vated AC120V ON positions See figure 7 11 NOTE The Switch Over Relay mounting block may have to be removed from the base for test access OFF AC120V OFF term 7 and term 1 24 to 28VDC term 7 and term 6 OVDC Activated AC120V ON term 7 and term 6 26 5 1VDC 6001 Figure 7 11 Switch Over Relay 7 7 Pendant Control The Pendant Control consists of 14 or 15 micro switches buttons When any of the circuits are completed by depressing a function button the appropriate relay contacts located in the relay box close and a 24V potential is applied to the solenoid to operate the hydraulic mini valve and to the hydraulic pump motor The 6001NB Pen dant Control has 5 volts applied to it a Pendant Control Test The following test will determine if the micro switches inside the Pendant Control are function ing correctly 1 Unplug the 24 pin Pendant Control c
25. between pins 1 and 2 of CN4 and pins 1 and 2 of between pins 3 and 4 of CN4 and pins 1 and 2 of CN10 See figure 6 17 CN11 See figure 6 18 NOTE The 15 amp battery protection fuse is in the line between CN4 pin 1 and CN10 pin 1 Test the continuity of the fuse if correct meter reading is not received Figure 6 18 CN4 to CN12 Test 1 Disconnect connectors CN4 CN12 Leave all other connectors connected Figure 6 17 2 Using an ohmmeter test for continuity b CN4 to CN11 Test between pins 5 and 6 of CN4 and pins 3 and 4 of CN12 See figure 6 19 1 Disconnect connectors CN4 and 11 Leave all other connectors connected Figure 6 19 Page 42 6001 6 10 Solenoids Each solenoid operates 24 source The solenoids are energized by 24 volt potential from the relay box This source can be that is controlled by the relays located inside the checked by measuring the voltage at relay box the 2 pin connector in question The solenoid windings are protected from exces sive heat with an internal thermal fuse that will 1 Activate either BATTERY or AC120V oper open after approximately seven 7 minutes of ating mode continuous operation The solenoid must be re placed if the internal thermal fuse has been blown The solenoids are mounted directly on either side of the hydraulic mini valves and push the spool valve in one direction or the other depending upon b Test 1 2 Disconnect
26. connector in question as shown in figure 6 20 Connector must be disconnected Polarity of meter leads is not important 2 meter should read approximately 16 ohms at room temperature 3 Measure the resistance between either pin and ground 4 Meter should read infinity e Test Results If the solenoid does not check out with the meter it is more than likely defective and must be replaced NOTE Whenever there are several compo nents of the same type a defective unit can also be detected by substi tuting a known good unit or wire con nector In some cases this may be faster than using a multi meter Page 44 6 11 Motor Pump Assembly The hydraulic pump motor is a 24 volt DC electric motor The oil pump unit is attached to the bottom of the motor and is a gear type displacement pump with a pumping capacity of 4 liter per min The Motor Pump Assembly is mounted on insula tors in the base of the table a Motor Pump Test 1 Disconnect motor connector CN11 Leave all other connectors connected and activate either BATTERY or AC120V operating mode 2 Activate any function and use a DC voltme ter to measure across the two pin connector Pin 1 and pin 2 See figure 6 21 Meter should read 24 28 volts Figure 6 21 Motor Input Voltage NOTE Ifthe pump has been activated continu ously for 1 1 2 to 2 minutes the thermal relay will interruptthe power tothe pump b Thermal Relay Test The Therm
27. eccentric cams as required to shift either cylinder fore or aft as needed so no twisting or flexing of the leg section is observed when it is stalled in the above horizontal position Tighten locking nuts when proper adjustment is achieved See figure 2 3 LEG SECTION a ee e rita p ES ea ur d Je 2 A E e TABLE SIDE FRANE T a t LEG CYLINDER la 4 a ie 7 7 SPANNER WRENCH Figure 2 3 Leg Section Adjustment 2 3 Split Leg Section Horizontal Adjustments Model 6000 Both leg sections should be level or even with each other when the table top is in the horizontal position If they are not an adjustment is necessary on the leg that is not level To adjust 1 Loosen the three small allen head bolts that are visible from the outside of the table 2 Loosen the allen head bolt located on the inside of the table frame Loosen the jam nutand turn the adjusting bolt located under the table side frame as required until the leg sections are even with each other and level with the table top See figure2 4 4 Tighten the adjusting nut and all of the allen head bolts when the adjustment is complete SMALL ALLEN BOLTS a E PIVOT AXIS JAM ADJUSTING ALLEN BALI WRENCH Figure 2 4 Horizontal Adjustment 2 4 Adjustable Brake Feet S N 6000 1986 3 000 to 6000 1988 12 000
28. for the brake release function for approximately 7 seconds If the brakes are already released using the BRAKE UNLOCK button no output is provided 1 Activate either BATTERY or AC120V oper ating mode 2 Test connectors CN6 and CN7 from the back while attached to the relay box All connectors should be connected 3 Activate each of the pendant control buttons and measure the output voltage for the corre sponding connector pins with a DC voltmeter See figure 6 16 9 Test Results If you do not receive the correct meter readings the relay box is defective and should be replaced NOTE Before deciding the relay box is de fective check the wires and pins in the connector blocks to make sure they are notloose or making a bad connec tion with their mate Brake Liniock Figure 6 16 Connector CN6 or CN7 NOTE If the battery power is ON and no table functions have been activated for ap proximately 3 minutes the power off circuit will interrupt the battery power 6 9 Main Wire Harness Continuity Tests If correct meter readings are not received in tests between components before replacing the com ponents test the Main Wire Harness to be sure all connectors and wires are making a good connec tion a CN4 to CN16 Test 1 Disconnect connectors 4 and 10 Leave all other connectors connected Page 41 6001 2 Using ohmmeter test for continuity 2 Using an ohmmeter test for continuity
29. measure across the two pin connector Pin 1 and pin 2 See figure 7 25 Meter should read 24 28 volts Figure 7 25 Motor Input Voltage NOTE Ifthe pump has been activated continu ously for 1 1 2to 2 minutes the thermal relay will interruptthe powertothe pump b Thermal Relay Test The Thermal Relay is used to interrupt the current flow to the pump motor to protect it from possible damage due to overheating 1 Turn OFF both BATTERY and AC120V operating modes 2 Use an ohmmeter to test for continuity between terminals 7 and 8 on the Thermal Relay See figure 7 26 9 DECREASE INCREASE RESET SWITCH Figure 7 26 Thermal Relay 6001 3 Thermal Relay should reset itself after approximately one minute if it is in the AUTO mode normal factory setting If the relay fails to reset itself check to make sure that the reset button is held IN with the small metal plate See figure 7 27 MET Al PLATE Figure 7 27 4 The Thermal Relay should activate after 1 1 2 to 2 minutes of continuous pump operation If necessary adjust the thermal cut out time by turn ing the adjustment screw clockwise to increase the time counterclockwise to decrease the time Refer to figure 7 26 c Test Results If you do not receive the correct meter readings the problem could be in the wires connectors relay box or main switch refer to that section for trouble shooting If the corre
30. oper ating mode NOTE The Brake Lock function is activated by pressing any function button except BRAKE UNLOCK A timer in the Relay Box allows continuous output for about 7 seconds If the brakes are already locked no output is provided The BRAKE UNLOCK button activates another timer in the relay box which allows continuous output for the brake release function for approximately 7 seconds If the brakes are already released using the BRAKE UNLOCK button no output is provided 2 Test connectors CN6 and CN7 from the back while attached to the relay box All connectors should be connected 3 Activate each ofthe pendant control buttons and measure the output voltage for the corre sponding connector pins with a DC voltmeter See figure 7 20 Figure 7 20 Connector CN6 or CN7 Page 55 6001 9 Test Results If you do not receive the correct meter readings the relay box is defective and should be replaced NOTE Before deciding the relay box is de fective check the wires and pins in the connector blocks to make sure they are notloose or making a bad connec tion with their mate elf the battery power is ON and no table functions have been activated for 3 hours the power off circuit will interrupt the battery power 7 10 Main Wire Harness Continuity Tests If correct meter readings are not received in tests between components before replacing the com ponents test the Main Wire Harness to
31. the 2 pin connector from the solenoid in question all other connectors should be connected See figure 6 20 which solenoid is activated 3 Use a DC voltmeter and measure the voltage across the 2 pin connector Pin 1 and a Solenoid Test pin 2 Meter should read approximately 24 28 The following tests will check the voltage applied volts to the solenoids and the resistance of the solenoid coil NOTE The appropriate pendant control button NOTE must be pushed during this test The If a solenoid does not function when the motor will run when this test is per pendant control button is pushed the formed and the brake locking solenoid problem could be the pendant control will be activated by any function other the relay box or the solenoid than MOVE Ja 1 a rh hw M Mc M u n M 0 ee W M M D a M A wA an Figure 6 20 Solenoid Test Page 43 6001 Test Results If you do not receive the correct voltage the prob lem could be in the wires leading down to the connector The problem could also be the relay box or the Pendant Control refer to appropriate section for troubleshooting If the correct voltage is obtained everything is good upto that point and the problem is more than likely the solenoid d Test 2 The solenoid can be checked out using an ohm meter 1 scale 1 Measure the resistance between the two pin
32. to check it out Certain defective components could cause the entire table to stop functioning or only one control function to stop It would depend on what part of the component failed Other defective components would only cause one control function to stop The following defective components could cause all control functions to be affected a Motor Pump Assembly b Main Switch Circuit and Wiring The following defective components could cause all control functions to be affected or only one control function a Relay Box b Pendant Control The componentlisted below would only affect one control function Solenoid When troubleshooting an electrical circuit start at the problem and work back to the power source NOTE On the battery model tables trouble shooting should begin by switching the operating mode For example ifa function fails when attempting to oper ate the table in the AC120V mode switch to the BATTERY mode If the function now operates the problem is probably located between the power cord and the relay box If the function also fails when in battery operation use the auxiliary switches to operate the function If the function now operates the problem is probably in the pendant control connectors or wiring from the pendant control to the relay box All connector pins are numbered usu ally with very small numbers 6001 IE AIDE n0 d BATTERY CHAR
33. vent cap with a phillips screwdriver and add fluid through this opening using a funnel See figure 1 20 NOTE The elevation cylinder should be com pletely down and all the other control functions in their neutral position when checking oil level RESERVOIR OPENING Figure 1 20 The type of oil that should be used is Mobil DTE 25 or equivalent This is a very high quality hydraulic oil The table requires approximately two quarts of oil to operate properly b Bleeding The Hydraulic System To purge the air from the hydraulic system operate each function back and forth at least two or three times NOTE Whenever a hydraulic line or com ponent is replaced bleed the air out of the lines using the pump pressure before mak ing the final connection Then operate the function until it stalls in both direc tions c Pressure Relief Valve The pressure relief valve is adjusted by turning the adjustment nut until the desired pressure is reached Page 10 To adjust 1 Remove the blind cap and attach a hydraulic pressure gauge to the main oil galley using plumbing bolt See figure 1 21 PRESSURE RELIEF VALVE PRESSURE GAUGE LONG 6 mm PLUMBING BOLT Figure 1 21 2 Raise the table top until the piston reaches the end of its stroke and stalls Observe reading on pressure gauge and turn the adjustment nut clock wise to increase oil pressure counterclockwise to decrease until desired reading i
34. 001 7 5 b Test Results A reading of 11 volts or below indicates the battery needs charging After batteries have been fully charged repeat the full load test If either battery s voltage drops below 11VDC it should be replaced 7 5 Battery Charging Box AC120V Transformer The Battery Charging Box contains the battery charging system as well as the components for AC120V operation except the transformer a Transformer Test 1 Confirm 120 VAC input at CN15 using Main Switch test in 7 3a 2 Connect CN15 disconnect CN18 brown and red wires and using an AC voltmeter test the transformer output at CN18 See figure 7 6 3 Meter should read 22VAC Figure 7 6 Connector CN18 Test b Test Results If the correct voltage is obtained everything is good up to this point and the problem would have to be in another area If you do not receive the correct measurements the problem may be in the wires connectors or transformer The transformer is located in the rear of the base under the stainless steel base cover The stainless steel cover will have to be discon nected and lifted from the base for access to the transformer for further testing c Battery Charging Box Test 1 Make sure all connectors are connected and turn AC120V operation ON Using a DC voltmeter test pin 3 and pin 4 of CN51 DO NOT disconnect connector CN51 See figure 7 7 RED WHITE 5 BLUE WHITE 6 BLA
35. 1 Using an ohmmeter R x 1 scale measure the resistance between the two pins of CN11 See figure 6 24 2 The meter should read 1102 ohms atroom temperature 3 Measure the resistance between either pin and ground 4 Meter should read infinity Figure 6 24 Motor Connector CN11 e Test Results If you do not receive the correct meter readings the motor or wiring is defective Page 45 6001 SECTION VII 6001 BATTERY MODEL ELECTRICAL TROUBLESHOOTING 7 1 General The battery table components operate on 24VDC The internal charging system also incorporates the components to transform the 120VAC input to 24VDC output to the components The Model designation 6001B is for all battery tables with a Serial Number of 6001B 1992 2 amp Prior The designation 6001NB is for all battery models with the Serial Number of 6001NB 1992 3 amp Later The two models can be easily identified by the position of the Main Power switch The power switch is on the lower front of the base on the 6001NB models See figure 7 2 NOTE This section covers the electrical troubleshooting for the 6001NB model ONLY Electrical Troubleshooting forthe 6001B is covered in section 6 SWITCH SH 6004 HB 1882 3 amp LATER S N 6001 B 1992 2 amp PRIOR Figure 7 2 Model Identification Page 46 7 2 Troubleshooting Notes The basic operation of each component will be defined along with a drawing and explanation on how
36. 2 Connector CN4 2 PIN CONNECTOR SOLENOIDS ERU PENDANT CONTROL TO RETURN CIRCUIT MICRO SWITCHES CN10 KR MODELS AUXILIARY BASE CONNECTOR BASE CONNECTOR a oam am am m am RELAY BOX ASSEMBLY DPST MAIN 9 POWER SWITCH ME am POWER CORD M 10 AMP FUSES Figure 4 1 6001N Electrical Circuit Block Diagram Page 25 b Test Results If you do not receive the correct voltage measure ment the problem would have to be in the wires main switch fuses or power cord If the correct voltage is obtained everything is good up to this point and the problem would have to be in another area 5 3 Pendant Control The Pendant Control consists of 13 or 14 micro switches buttons When any of the circuits are completed by depressing a control button the appropriate relay contacts located in the relay box close applying 120V potential to the appropri ate solenoid to operate the mini valve and the pump motor The Pendant Control has only 5 6 volts applied to it a Pendant Control Test The following test will determine if the micro switches inside the Pendant Control are func tioning correctly Y BRAKE 1 Unplug the pendant control from the base of the table You will be checking the cord side connector 2 Use an ohmmeter R x 1 scale and check the continuity between pin 1 and pins 4 through 19
37. 24VDC The internal charging system also incorporates the components to transform the 120VAC input to 24VDC output to the components The Model designation 6001B is for all battery tables with a Serial Number of 6001B 1992 2 amp Prior The designation 6001NB is for all battery models with the Serial Number of 6001NB 1992 3 amp Later The two models can be easily identified by the position of the Main Power switch The power switch is on the top of the base on the 6001B models See figure 6 2 NOTE This section covers the electrical troubleshooting for the 6001B model ONLY Electrical Troubleshooting for the 6001NB is covered in section 7 6001 NE POWER SWITCH S H 6001 NB 1992 3 amp LATER MAIN POWER SWITCH 5 6001 B 1992 2 amp PHIOH Figure 6 2 Model Identification Page 34 6 2 Troubleshooting Notes The basic operation of each component will be defined along with a drawing and explanation on how to check it out Certain defective components could cause the entire table to stop functioning or only one control function to stop It would depend on what part of the component failed Other defective components would only cause one control function to stop Thefollowing defective components could cause all control functions to be affected a Motor Pump Assembly b Main Switch Circuit and Wiring The following defective components could cause all control functions to be affected or only one cont
38. 5 2 Connector CN15 should be disconnected 9 Test Results 3 Use the R x 1 scale of the ohmmeter and measure the resistance between the pins located Ifyou do not receive the correct meter readings the in the pump connector CN15 See figure 5 11 motor or wiring is defective Page 32 5 7 Return to Level Micro Switches The return to level feature is activated by a single button on the pendant control and automatically levels the major table functions lateral tilt tren delenburg back section and leg section The return to level system consists of 6 micro switches 2 electrical connectors and the related wiring The micro switches are mounted on or adjacent to the function they control and are wired for normally open or normally closed operation The micro switches are lever actuated and can be adjusted at the individual switch mounting brack ets See figure 5 12 The micro switches operate on low voltage and control the function circuits pump motor and ap RELAY BOX mu propriate solenoid valves when activated by the pendant control RETURN button The micro switches are wired to the relay box through a riser cord and to the 15 pin connector CN2 See figure 5 12 for switch location and identification 5 8 Troubleshooting If a problem is suspected in the return circuits disconnect the connector CN2 from the Relay Box to eliminate the circui
39. Brena Mihi Mean rernm Urue finge Orange Wea Villa vert at Hri ihis DD E Sh o zz Figure 6 11 Base Connector Continuity Test 6001 6 7 Auxiliary Switches The following tests will determine if the auxiliary switches are functioning properly a Switch Test Disconnect connector 9 at the Relay Box and using an ohmmeter check for continuity between pin 23 and pins 4 through 28 while activating the appropriate switch See figure 6 12 Meter should read 0 ohms b Test Results If proper meter readings are not received test the individual switches as necessary Using an ohm TABLE UP TABLE BACK WIHITE IBROWN a TILT RIGHT ORANGE LEFT WHITEJORANGE LEG LIP GREY o LEG DOWN WHITE GREY PLEX WHITEJBLUE BLACK REFLEX WHJBLACK a _ BRAKE UNLOCK meter test the operation of individual switch with the test lead at the center terminal of the switch and the test lead at the terminal opposite the direction of the switch actuation See figure 6 13 Meter should read 0 ohms If the switches check out the problem would have to be in the wiring or connector 9 Figure 6 13 Auxiliary Switch Test 6 21 16 22 0 23 4 21 17 23 97 71 eo O020260202800 MP NL Eu TA 11 233 EA 5 23 12 71 25 23 14 21 Figure 6 12 Auxiliary Switch Connector CN9 Page 39 6001 6 8 Relay
40. CK 4 BROWN 2 BROWN 1 Figure 7 7 Connector CN51 2 Meter should read 26 5 1VDC 3 Test pin 5 and pin 6 of CN51 with DC voltmeter to test operation of CHARGING indicator light next to power cord connector 4 Meter should read 26 5 1VDC if charger is operating If batteries are fully chargedthere willbe under 5 volts at pins 5 and 6 d Test Results If you do not receive the correct readings the charger system connectors wires or the trans former may be defective Page 49 6001NB e Charging System Output Adjustment If output reading at pins 3 and 4 is not 26 5 1 VDC the output can be adjusted at the variable resistor VR R59 on the circuit board inside the Charging Box See figure 7 8 Turn the adjuster clockwise to decrease the voltage Counterclockwise to increase the voltage NOTE The battery connectors must be dis connected to adjustthe battery charger output Figure 7 8 7 6 Switch Over Relay a Switch Over Relay in OFF Position The Switch Over Relay supplies the 24 volt input power from either the BATTERY or AC120V oper ating modes to the relay box for table operation In the normal OFF position BATTERY power is sup plied to the relay box See figure 7 9 RELAY BOX 2 5 0 RELAY BATTERY Figure 7 9 Relay in OFF Position Page 50 b Switch Over Relay in Activated Position When the AC120V mode is activated by the main switch a signal from the relay box
41. GE Figure 7 1 Electrical Circuit Block Diagram Model 6001NB Page 47 6001 7 3 Switch The main power supply 120 VAC 60 HZ comes inthrough the power cord and through the main switch The main switch opens both lines when inthe OFF position Two 10 amp fuses are used to protect the complete electrical system and are located next to the main switch See figure 7 2 a Main Switch Test The following test will determine if line voltage is applied to connector CN15 which in turn would supply 120VAC power to the table 1 Plug the power cord into the 120VAC supply wall receptacle and turn the main switch ON 2 Disconnect connector CN15 See figure 7 1 Leave all other connectors connected CAUTION Line voltage 120 VAC will be mea sured in this test Do not touch uninsu lated connector pins or meter testleads 3 Use an AC voltmeter capable of measuring 120 VAC and measure the voltage between pins 1 and 2 black and white wires located in connector CN15 See figure 7 3 You should receive line voltage 120 VAC BLACK Figure 7 3 Connector CN15 Test b Test Results If the correct voltage is obtained everything is good up to this point and the problem would have to be in another area If you do not receive the correct measurements the problem would have to be in the wires main switch fuses or power cord Check the continuity from the power cord connec tor ICN1 through the fuses
42. TION Line voltage 120 VAC will be mea sured in this test Do not touch uninsu lated connector pins or meter testleads 3 Use an AC voltmeter capable of measuring 120 VAC and measure the voltage between pins 1 and 2 black and white wires located in connector CN12 See figure 6 3 You should receive line voltage 120 VAC Connector CN12 Color Code Pin 1 Black Fin 4 Black Pin 2 White Pin Hed Pin 3 Yellow Pin amp Blue Figure 6 3 Connector CN12 Test b Test Results If the correct voltage is obtained everything is good up to this point and the problem would have to be in another area If you do not receive the correct measurements the problem would have to be in the wires main switch fuses or power cord Check the continuity from the power cord connec tor CN13 through the fuses switch and wiring to connector CN12 Remove the power cord discon nect CN12 turn the Main Power Switch ON and test as shown in figure 6 4 13 DH 12 SWITCH SWITCH OW OFF 1 obmr x 2 Infinity Figure 6 4 CN12 to CN13 Continuity Test 6 4 Batteries The BATTERY operating mode is powered by two 12 volt batteries connected in series to provide the 24 volt operating power The battery system voltage should be 24VDC with a range of 22VDC to 26VDC If the battery charge level falls below 23 5 volts the BATTERY operation indicator on the pendant control will blink indicating that the batte
43. al Relay is used to interrupt the current flow to the pump motor to protect it from possible damage due to overheating 1 Turn OFF both BATTERY and AC120V operating modes 6001 2 Use an ohmmeter to test for continuity between terminals 7 and 8 on the Thermal Relay See figure 6 22 9 DECREASE e IHCHEASE Figure 6 22 Thermal Relay 3 The Thermal Relay should reset itself after approximately one minute if it is in the AUTO mode this is the normal factory setting If the relay fails to reset itself check to make sure that the reset button is held IN with the small metal plate See figure 6 23 HESET BUTTON Figure 6 23 4 The Thermal Relay should activate after 1 1 2 to 2 minutes of continuous pump operation If necessary adjust the thermal cut out time by turn ing the adjustment screw clockwise to increase the time counterclockwise to decrease the time Refer to figure 6 22 c Test Results If you do not receive the correct meter readings the problem could be in the wires connectors relay box or main switch refer to that section for trouble shooting If the correct voltage is obtained everything is good up to that point and the problem could be the motor d Motor Resistance Test The motor can be statically checked for resistance using anohmmeter This testis not 100 accurate because you are checking the motor with very low voltage from the meter and without any load
44. ant control buttons Basically the relays enable a 5 5 volt potential to control the 120 volt circuit The following tests will determine if the relay box is functioning correctly a Relay Box Input Connector CN4 1 Plug the power cord into the 120 VAC power supply wall receptacle and turn the main switch ON Leave all connectors connected CAUTION Line voltage 120 VAC will be mea sured in this test Do not touch uninsu lated connector pins or meter testleads Page 27 2 Use AC voltmeter capable of measuring 120 volts and measure the voltage between pins 1 white and 2 black of connector CN4 for input voltage See figure 5 6 Meter should read line voltage 120 VAC 3 Activate any table function with the Pendant Control and using an AC voltmeter test the voltage at pins 3 and 4 of CN4 for output to the pump Meter should read 120 VAC hata Black Fine 5 6 4 b Test Results If you do not receive the correct meter readings the relay box or wiring is defective the correct readings are obtained this part of the relay box is okay Proceed to the next step c Relay Box Output Connector CN8 This test checks the low voltage applied to the pen dant control buttons 1 The power cord should be plugged into the wall receptacle and main switch turned ON 2 Disconnect Pendant Control connector All other connectors should be connected 3 Using a
45. be sure all connectors and wires are making a good connec tion a CN4 to Batteries Test 1 Disconnect connectors 4 and the and connectors from the batteries Leave all other connectors connected 2 Using an ohmmeter test for continuity between pin 1 of CN4 and battery connector Also test between pin 2 of CN4 and battery connector See figure 7 21 NOTE The 15 amp battery protection fuse is in the line between CN4 pin 1 and the battery connector Test the continuity of the fuse if correct meter reading is not received Figure 7 21 Page 56 b CN4 to CN12 Test 1 Disconnect connectors CN4 and CN12 Leave all other connectors connected 2 Using an ohmmeter test for continuity between pins 3 and 4 of CN4 and pins 1 and 2 of CN12 See figure 7 22 Figure 7 22 c CN4 to Charging Box Test 1 Disconnect connectors CN4 CN11 and CN51 Leave all other connectors connected 2 Using an ohmmeter test for continuity between pins 4 5 and 6 of CN4 pins 1 and 2 of CN11 and pin 4 of CN51 See figure 7 23 Figure 7 23 CN4 CN11 and CN51 6001 7 11 Solenoids The solenoids are energized by 24 volt potential that is controlled by the relay box The solenoid windings are protected from exces sive heat by an internal thermal fuse that will open after approx 7 minutes of continuous operation The solenoid must be replaced if the internal ther mal fuse has been blown The sol
46. correct Speed Adjustment Trendelenburg Back section or Flex check with gauge Spool Valve Not Centered Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Bad Solenoid Defective Relay Box or Pendant Control Defective or Dirty Check Valves Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil TO SECTION MINI VALVE INTERNAL OIL RETURN TO RESERVOIR Figure 3 4 Flex System Circuit Page 18 3 7 BACK SECTION DIAGNOSIS CHART Problem Reason Back Section function moves improperly Incorrect Speed Adjustment Spool Valve Not Centered Bad Check Valves Low on Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Bad Solenoid Defective Relay Box or Pendant Control Back Section function chatters or loses position Defective or Dirty Check Valves Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil BACK SECTION CYLINDER ASSEMBLY FLEXIBLE HOSES FLEXIBLE HOSES NOTE ONE SIDE SHOWN FOR CLARITY SPEED CONTROL INTERNAL FROM PUMP INTERNAL OIL RETURN RESERVOIR MINI VALVE 7 5 Figure 3 5 Back Section Circuit Page 19 3 8 LEG SECTION DIAGNOSIS CHART Problem Reason Leg function moves improperly Incorrect Speed Adjustment Spool Valve Not Centered Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Bad Solen
47. ct readings are obtained everything is good up to that point and the problem could be the motor d Motor Resistance Test The motor can be statically checked for resistance using anohmmeter This testis not 100 accurate because you are checking the motor with very low voltage from the meter and without any load 1 Using anohmmeter R x 1 scale measure the resistance between the two pins of CN12 See figure 7 28 2 The meter should read 1102 ohms atroom temperature 3 Measure the resistance between either pin and ground 4 Meter should read infinity Figure 7 28 Motor Connector CN12 e Test Results If you do notreceive the correct meter readings the motor or wiring is defective Page 59 SECTION VIII ELECTRICAL SYSTEM ADJUSTMENTS 8 1 Relay Box Adjustments Models 6001N amp 6001NB The Relay Box contains variable resistors for ad justing the operating timers for the BRAKE SET and BRAKE UNLOCK functions The Relay Box for the battery model tables 6001NB also has variable resistors for setting the Power Off timer and the battery recharge warning circuit These timers are set at the factory and usually never need adjustment If an adjustment is necessary remove the relay box cover and use the following proce dures See figures 8 1 and 8 2 a Brake Release Timer The Brake Release Timer is set for about 7 sec onds and is controlled by the variable resistor VR1 on the relay box circuit board Turn th
48. djuster clockwise to increase the operating time Counter clockwise to decrease the operating time b Battery Low Voltage Indicator When the battery voltage drops below 23 5 volts the BATTERY power indicator will begin to Flash indicating low battery power This circuit is con trolled by the variable resistor VR1 and should be set at 23 5 volts Turn the adjuster clockwise to increase the voltage at which the circuit is acti vated counterclockwise to decrease Page 61 Figure 8 3 Relay Box Adjustments Model 6001 Page 62 H 3 E 454 656506969 69 00 00 Ye 8 t 199996 009090090600 SOOO OO 1 eT 5V d ps GND TRAI 2 RS RLI QP RL2 RL 3 RL 4 RL 5 e RL 6 RL 7 RL 8 RL 9 RL IO RL H RL 12 RL 13 RL 14 RL 21 RL 22 RL 20 044 CNIO Wiring Diagram Model 6001KR Page 63 E Q6 1 09 Allis ocev 2 3 t HHHH HH i D T1
49. e Disconnect connector CN4 leave all other connectors connected 2 Using a DC voltmeter test input power for both the BATTERY and AC120V operating modes See figure 7 18 Meter should read approximately 24 28 volts BATTERY mode AC120V mode 1 5 2 6 Connector CN4 Color Code Pin 1 Red Pin 5 White Pin 2 Blue Pin 6 Black Pin 3 Yellow Pin 7 Yellow Pin 4 Blue Figure 7 18 Relay Box Input Page 54 b Test Results If you do not receive the correct meter readings the problem is in the input wiring connectors or components If the correct readings are obtained proceed to the next step c Checking Output to Pump 1 Disconnect pump connector CN12 connect all other connectors and activate the AC120V oper ating mode 2 Test CN12 at pin 1 and pin 2 with a DC voltmeter Meter should read approximately 24 28 volts when any function button is activated If no voltage is present use an ohmmeter to test the continuity from CN12 to CN4 yellow and blue wires Refer to figure 7 18 for pin locations d Checking Output to Pendant Control NOTE The Relay Box connectors CN1 Pen dant Control and CN8 Auxiliary Base Connector are interchangeable 1 Disconnect the Pendant Control connector from the base connector connect all other connec tors and use a DC voltmeter to measure the follow ing sockets located in the table base connector CN13 See figure 7 19 NOTE
50. e adjuster clockwise to increase the operating time Counter clockwise to decrease the operating time b Brake Set Timer The Brake Set Timer is set for about 7 seconds and is controlled by the variable resistor VR2 on the relay box circuit board Turn the adjuster clockwise to increase the operating time Counterclockwise to decrease the operating time c Battery Low Voltage Indicator When the battery voltage drops below 23 5 volts the BATTERY power indicator will begin to Flash indicating low battery power This circuit is con trolled by the variable resistor VR3 and should be set at 23 5 volts Turn the adjuster clockwise to increase the voltage at which the circuit is acti vated counterclockwise to decrease Figure 8 1 Relay Box Adjustments Model 6001N Page 60 VRZ VR1 ogo cl 3 ol Figure 8 2 Relay Box Adjustments Model 6001 8 2 Relay Box Adjustments Model 6001B The Relay Box contains variable resistors for ad justing the operating timers for the BRAKE UN LOCK Power Off timer and the battery recharge warning circuit These timers are set at the factory and usually never need adjustment If an adjust mentis necessary remove the relay box cover and use the following procedures See figure 8 3 a Brake Release Timer The Brake Release Timer is set for about 7 sec onds and is controlled by the variable resistor VR3 on the relay box circuit board Turn the a
51. embly starting capacitor b Main Switch Circuit and Wiring The following defective components could cause all control functions to be affected or only one control function a Relay Box b Pendant Control The component listed below would only affect one control function Solenoid When troubleshooting an electrical circuit start at the problem and work back to the power source 5 2 Main Switch The main power supply 120 VAC 60 HZ comes in through the power cord and through the main switch The main switch opens both lines when in the OFF position An 8 amp ortwo 10 amp fuses are used to protect the complete electrical system and are located next to the main switch a Main Switch Test The following test will determine if line voltage is applied to connector CN4 which in turn would power the table Page 24 1 Plug the power cord into the 120VAC power supply wall receptacle and turn ON the main switch 2 Disconnect connector 4 from the relay box See figure 5 1 Leave all other connectors connected RELAY BOX Figure 5 1 Main Power Test CAUTION Line voltage 120 VAC will be mea sured in this test Do not touch uninsu lated connector pins or meter test leads 3 Usean AC voltmeter capable of measuring 120 VAC and measure the voltage between pins 1 and 2 black and white wires located in connec tor CN4 See figure 5 2 You should receive line voltage 120 VAC Yellow Figure 5
52. enoids are mounted directly on either side of the hydraulic mini valves and push the spool valve in one direction or the other depending upon which solenoid is activated a Solenoid Test The following tests will check the voltage applied to the solenoids and the resistance of the solenoid coil b Test 1 1 Activate either BATTERY or AC120V oper ating mode mum ELLOS i um g M 1 I 1 M a i 1 aia 2 Disconnect the 2 pin connector from the solenoid in question all other connectors should be connected See figure 7 24 3 Use a DC voltmeter and measure the voltage across the 2 pin connector Pin 1 and pin 2 Meter should read approximately 24 28 volts NOTE appropriate pendant control but ton must be pushed during this test The motor will run when this test is performed and the brake locking sole noid will be activated by any function other than MOVE elf a solenoid does not function when the pendant control button is pushed the problem could be the pendant con trol the relay box or the solenoid e mrL AY pr BLUE BLUE Figure 7 24 Solenoid Test Page 57 6001 Test Results If you do not receive the correct voltage the prob lem could be in the wires leading down to the connector The problem could also be in the relay box or the Pendant Contr
53. eral tilt assem bly consists of two cylinders pistons and connect ing rods The connecting rods attach to the lateral tilt lever which connects to the table side frames When hydraulic fluid is pumped into one cylinder the piston and connecting rod pushes the lateral tilt lever which tilts the table top to one side To tilt the table top in the opposite direction fluid is pumped into the opposite cylinder See figure 1 13 LATERAL TILT LEVER a yo END VIEW PISTON CONNECTING RODS Figure 1 13 Lateral Tilt Cylinder Assembly PISTON 4 Elevation Cylinder This single action cylin der does not have hydraulic fluid on both sides of the piston It depends on the weight of the table top assembly to lower it The cylinder is set in the center of the elevation main column cylinder is elevated by the driven force of the oil pressure When lowering the oil that is accumulated in the cylinder is returned to the oil reservoir through the mini valve due to the table top weight A slider support assembly is used to support the weight of the upper table section A stainless steel shroud covers the flexible hydraulic hoses and slider See figure 1 14 ELEVATION CYLINDER RHOD EXTERIOR SHROUD SLIDER T ELEVATION SUPPORT CYLINDER ASSEMBLY TUBE ELEVATION ii PISTON O RING _ CYLINDER TUBE O RING Figure 1 14 Elevation Cylinder Assembly 5 Brake Cylinders The brake cylinde
54. from a few minutes to several hours 2 None of the table functions will operate properly if the valve is wide open All of the hydraulic fluid from the pump is simply pumped through the brake bypass circuit because that is the easiest path for the oil to follow k Flex Reflex System The Flex Reflex system on the early model tables consists of two hydraulic systems trendelenburg and back section operating simultaneously When the systemis activated by the pendant control both the trendelenburg and back section mini valves are activated andthe hydraulic cylinders operate in parallel The Flex Reflex system used on the present tables incorporates an additional mini valve 7 total which connects the trendelenburg and back section hy draulic systems in a series When FLEX is acti vated by the pendant control the Flex Reflex mini valve opens the oil pressure path to the Reverse Trendelenburg piston The return oil path from the trendelenburg piston is routed through the back section cylinder to the mini valve return port See figure 1 19 _ TREND BACK UP REV TREND BACK DOWN PLUMBING TERMINAL FLEX REFLEX MINI VALVE Figure 1 19 Flex Reflex System Page9 1 3 Hydraulic Adjustments a Fluid Level The fluid level should be approximately 1 2 below the filler hole or gasket surface If additional fluid is needed remove the filler
55. h has pump pressure allowing the oil to flow through the various parts of the mini valve to the function The spool valve also opens an oil return circuit which allows the oil to return to the oil reservoir The main components of the mini valve and their functions are listed below 1 Spool Valve Opens the main oil galley pump pressure to either mini valve outlet de pending on which direction the spool valve is pushed Also it provides a return path for the oil returning back into the reservoir 2 Pilot Plunger There are two plungers ina four way mini valve one in a 3 way mini valve one under each check valve The purpose of the pilot plungers is to mechanically open the return check valve allowing the oil to return back into the reservoir 3 Check Valve Two are provided in each four way mini valve to seal the oil in the cylinders and oil lines and prevent any movement of the table One check valve is provided in a 3 way mini valve 4 Speed Adjustments There are two speed adjustments in each mini valve They are needle valve type controls which restrict the volume of oil returning back into the reservoir thereby control ling the speed of the table surface movement A 3 way mini valve has only one speed adjustment The speed controls are always located in the return oil circuit This prevents uncontrolled movement of the piston in the slave cylinder due to one side of the piston being loaded with hydraulic press
56. he table contains the following components Re fer to the block diagrams figures 1 1 amp 1 2 for relationship a Oil Reservoir Main oil supply Approximately two quarts TRENDELENBURG ELEVATION CYLINDER PLUMBING TERMINAL MOTOR PUMP PRESSURE ASSEMBLY RELIEF GIL RESERVOIR NOTE Continuing development of the Model 6000 6001 Table has resulted in sev eral changes However the basic op eration of the internal components re mains the same Figure 1 1 depicts the hydraulic system of the early models and figure 1 2 depicts the later N series models This manual covers the 6000N 6001N series Serial Num ber 6001N 1992 1 amp Later and all battery model tables b Motor Pump Assembly A positive displace ment gear type pump provides the necessary oil pressure and volume BRAKE SYSTEM LEG SECTION 6001 ONLY PENDANT CONTROL MINI VALVES RELAY BOX 31 ON OFF SWITCH BRAKE 120 VAC LEG 60 HZ Figure 1 1 Hydraulic Block Diagram Early Models Page 1 Pressure Relief Valve Provides an alternate e Hydraulic Lines Fittings Connections They path when the hydraulic cylinders reach the end of provide a path for the hydraulic oil their stroke f Hydraulic Cylinders They convert the hydraulic d Electro Hydraulic Mini Valve Assemblies These fluid pressure and volume into mechanical motion direct the fluid to the appropriate hydraulic cylin ders BACK
57. hen ing continuity checks NOTE If you do not receive the proper continu ity results at connector CN2 it does not necessarily mean the micro switch is defective There could be a problem with the riser cord between connectors CN2 and CN10 orin the wiring from the switch to connector CN10 Further tests will have to be made to determine the exact problem RISER CORD Figure 5 13 Return Micro Switch Test Page32B ME 1 Trendelenburg Test at pinz 1 amp amp Table Switch Meter Position Position Reading Open Infinity Open Infinity Closed 0 When table is in Trendelenburg Position 5 1 brings the top back to level NS 2 Reverse Trendelenburg Test at ping 2 amp 9 Table Switch Meter Position Position Reading Level Open Infinity Head Up Closed 0 Head Dn Open Indinity When table in Reverse Trendelenburg Position NS 2 brings the tap back to bevel Figure 5 14 Trendelenburg Return Switches SS eee ME 3 Lateral Tilt Lett H amp 4 Lateral Test at pins 3 amp 9 Test at pins 4 amp 9 Table Swilch Meter Position Position Reading Lavel Infinity Tilt Rilght Infinity Table Switch Meter Pasitlamn Position Reading Level Infinity Tilt Righi Tilt Lefi 0 Tilt Lett Lrifinity When table is inTilt Left Position NS 3 When table is in Tilt Right Position 54 brings the top back to level brings the top back to level
58. here is nothing wrong with the Pendant Control c LED Test The BATTERY and AC120V power ON indicators can be checked with an LED tester Test BAT TERY indicator at pin 1 and pin 2 of 24 pin Pendant Control connector Test AC120V indica tor at pin 1 and pin 3 See figure 7 12 If no LED tester is available the LEDs can be tested by applying 5 volts to the appropriate pins To avoid damage to the LED a 330 ohm resistor must be placed between the power source and the connector pins See figure 7 13 OHM BVOC Figure 7 13 LED Test d Wiring Harness Test The following test checks the wires leading from the relay box connector to the 24 pin connector table socket These wires apply low voltage to the pendant control buttons 1 Activate the AC120V operating mode 2 Disconnect the pendant control from the table base connector All other connectors should be connected 3 Use a DC voltmeter and measure the following pins located in the 24 pin table base connector CN13 See figure 7 14 Page 52 NOTE fine wire or a paper clip may be needed to accurately test the small sockets in the connector The connec tor is low voltage and there is no danger of electrical shock Pin 19 will have no voltage potential unless one of the return to level micro switches are activated Figure 7 14 Table Base Connector e Test Results If you do not receive the correct voltage reading the wiri
59. icro switches inside the Pendant Control are func tioning correctly 1 Unplug the 19 pin Pendant Control connec tor from the base ofthe table You willbe checking the cord side connector A i ic i La BATTERY LED hs nx THT LEFT en _ LEG UP 4 LEG DOWN 3 FLEX 8 iS UNLOCK o BATTERY Ga 2 Use ohmmeter R x 1 and check the continuity between pin 1 and 4 through 16 while pressing the appropriate button Also test between pins 18 and 19 See figure 6 8 3 Ohmmeter must show continuity between the pins that are indicated when the appropriate buttons are pressed NOTE Pins 2 and 3 are connected to the LEDs AC120V and BATTERY indicator lights on the pendant control and cannot be checked with an ohmmeter Pa POWER LED ix TABLE 4 TABLE DOWN HEY TREND a TREND 7 eoo EEUU TRI TILT RIGHT Figure 6 8 Pendant Control Test Page 37 6001 b Test Results If you do notreceive continuity between any of the pins either the micro switch in the Pendant Con trol is defective or a wire is broken Either of these problems can be repaired easily If you receive correct readings with the meter there is nothing wrong with the Pendant Control c LED Test The BATTERY and AC120V power ON indicators can be checked with an LED tester Test BAT TERY indicat
60. ion Turn the speed controls until desired values are obtained Back Section Up 65KG CMt 925PSI Dn 65KG CMt 925PSI Trendelenburg Up 65KG CMt 925PSI Dn 65KG CMt 925PSI Flex 70KG CMT 995PSI Reflex 70KG CMT1 995PSI NOTE When adjusting Flex Reflex speed con trols set Reflex last Elevation There is not a speed adjustment for raising the table The speed control will only affect the rate of descent and it should equal the rate of elevation Page 11 SECTION MECHANICAL TABLE ADJUSTMENTS 2 1 Back Section Gear Mesh Adjustment The gear mesh is adjusted by the use of an eccen tric cam This cam moves the gear teeth closer together to eliminate gear lash This adjustment arrangement compensates for any wear between the gears that might occur To adjust Loosen the cam locking nut and allen set screw Use a spanner wrench to rotate the eccentric cam Use firm pressure on the spanner wrench See figure 2 1 Tighten the locking nut and set screw when adjustment is complete SPANNER WRENCH Figure 2 1 Eccentric Cam Adjustment 2 2 Hydraulic Cylinder Adjustment Back amp Foot Leg Sections The hydraulic cylinder rams that control both the back and foot leg sections must move together so that these sections are not twisted when operated This is accomplished by the use of eccentric cams that move the cylinder bodies fore and aft to adjust their effective stroke NOTE Adjust gear mesh before adjusting ec cen
61. movable surface can be moved one way or the other by pumping hydraulic fluid into the cylin der on either side of the piston Obviously if oil is pumped into one side of the cylinder a return path must be provided for the oil on the other side See figure 1 10 Page 6 O RING O RING i D PISTON HYDRAULIC LINE Figure 1 10 Back Section Cylinder 2 Trendelenburg Cylinder Assembly This cylinder piston arrangement has rack teeth cut into the top of each piston These teeth mesh with a pinon gear that is connected directly to the table side frames The pinion gear shaft and table side frames are supported by bearings at either side When hydraulic fluid is pumped into one side of the cylinder the pistons are pushed in one direction moving the pinion gear and table side frames with them Oil pressure can be applied to either side of the piston making the table tilt end for end See figure 1 11 SIDE VIEW Figure 1 11 Trendelenburg Cylinder Assy In order to remove any looseness or play in the table top the trendelenburg pistons are made in two pieces as shown figure 1 12 This arrange ment eliminates any gear lash between the piston teeth and the table pinion gear due to oil pressure always being present on both sides of the pistons OIL PRESSURE OIL PRESSURE SPLIT PISTONS TOP VIEW REMOVE GEAR LASH Figure 1 12 Trendelenburg Cylinder Pistons 3 Lateral Tilt Assembly The lat
62. ng or connector pins may be faulty Discon nect connector CN1 from the Relay Box and using an ohmmeter test the continuity between the cor responding pins in connectors CN1 and CN13 See figure 7 15 If the correct readings are ob tained this part of the circuit is okay and the problem may be the relay box 12 hia 13 14 i noo 15 Purple ithe 16 Black Nhiip 17 Usad 18 Liner 19 Hat Lemi 20 21 fe White 1 2 J 4 7 B 10 ii Figure 7 15 Base Connector Continuity Test 6001NB 7 8 Auxiliary Switches The following tests will determine if the auxiliary switches are functioning properly a Switch Test Disconnect connector 9 at the Relay Box and using an ohmmeter check for continuity at the connector pins pin 1A common while activating the appropriate switch See figure 7 16 Meter should read 0 ohms b Test Results If proper meter readings are not received test the individual switches as necessary Using an ohm exe bbe a L While range Figure 7 16 Fase Tide White Red White Valine White Grow meter test the operation of an individual switch with the test lead at the center terminal of the switch and the test lead at the terminal opposite the direction of the switch actuation See figure
63. oid Defective Relay Box or Pendant Control Leg function chatters or loses position Defective or Dirty Check Valves Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil LEG SECTION CYLINDER ASSEMBLY FLEXIBLE DOWN CIRCUIT CHECK VALVE a a NOTE ONE SIDE ett SHOWN FOR CLARITY 1 i di ENT cl ery 77 FLEXIBLE HOSES INTERNAL OlL INTERNAL FROM PUMP TO RESERVOIR Figure 3 6 Leg Section Circuit Page 20 3 9 BRAKE CIRCUIT Problem Brakes will not set properly NOTE If brakes have been released with the Emergency Brake Release Valve brakes will not reset until BRAKE UN LOCK Circuit has been activated Brakes Will Not Stay Locked Brakes will not retract properly PLUMBING TERMINAL BARAKE CYLINDER FLEXIBLE HOSES CHECK VALVE DIAGNOSIS CHART Reason Emergency Brake Release Valve Open or Defec tive Spool Valve Not Centered Bad Check Valve Low on Oil Pressure Relief Valve Not Set Properly Pinched Hose Defective Mini Valve Defective Relay Box or Pendant Control Emergency Brake Release Valve Open or Defec tive Defective or Dirty Check Valve Oil Leakage in Circuit Leaking O Ring Inside Cylinder Incorrect Speed Adjustment Bad Check Valve Spool Valve Not Centered Defective Mini Valve Pinched Hose Defective Solenoid or Wiring Defective Relay Box or Pendant Control RETURN TO RESERVOIR 7
64. ol refer to appropriate section for troubleshooting If the correct voltage is obtained everything is good up to that point and the problem is more than likely the solenoid d Test 2 The solenoid can be checked out using an ohm meter 1 scale 1 Measure the resistance between the two pin connector in question as shown in figure 7 24 Connector must be disconnected Polarity of meter leads is not important 2 meter should read approximately 16 ohms at room temperature 3 Measure the resistance between either pin and ground 4 Meter should read infinity e Test Results If the solenoid does not check out with the meter it is more than likely defective and must be replaced NOTE Whenever there are several compo nents of the same type a defective unit can also be detected by substi tuting a known good unit or wire con nector In some cases this may be faster than using a multi meter 7 12 Motor Pump Assembly The hydraulic pump motor is a 24 volt DC electric motor The oil pump unit is attached to the bottom of the motor and is a gear type displacement pump with a pumping capacity of 4 liter per min Page 58 The Motor Pump Assembly is mounted on insula tors in the base of the table a Motor Pump Test 1 Disconnect motor connector CN12 Leave all other connectors connected and activate either BATTERY or AC120V operating mode 2 Activate any function and use a DC voltme ter to
65. olenoid in question See figure 5 8 3 Use a voltmeter capable of measuring 120 VAC and measure the voltage across the 2 pin connector Polarity of meter leads is not important NOTE The appropriate pendant control but ton must be pushed during this test The motor will run when this test is performed and the brake locking sole noid will be activated by any function other than UNLOCK c Test Results If you do not receive the correct voltage the prob lem could be in the wires leading to connectors CN6 and CN7 The problem could also be in the relay box or the Pendant Control refer to appropri ate section for troubleshooting If the correct voltage is obtained everything is good up to that point and the problem is more than likely the solenoid d Step 2 The solenoid can be checked out using an ohm meter 1 scale 1 Measure the resistance between the two pins of the connector in question See figure 5 8 Connector being tested must be disconnected Polarity of meter leads is not important 2 The meter should read approximately 80 90 ohms at room temperature Page 29 3 Measure the resistance between either pin and ground 4 Meter should read infinity e Test Results If the solenoid does not check out with the meter it is more than likely defective and must be replaced NOTE Whenever there are several compo nents of the same type a defective unit can also be detected by substitu
66. onnec tor from the base of the table You will be checking the cord side connector 2 Use an ohmmeter R x 1 and check the continuity between pins 1 and pins 4 through 19 while pressing the appropriate button Also test between pins 21 and 22 See figure 7 12 3 Ohmmeter must show continuity between the pins that are indicated when the appropriate buttons are pressed NOTE Pins 2 and 3 are connected to the LEDs AC120V and BATTERY indicator lights on the pendant control and cannot be checked with an ohmmeter Pin 19 is used on KRB Models ONLY Pins 17 18 20 23 amp 24 are NOT USED GATT LEO BATT LED E AC POWER LED POWER LED bi TABLE UF TAMLE LP TABLE LIH TABLE DH z G REV TREND REY TRENG TREND UF 9 BACK UP BACK DOWN RACK DOWN TILT BIGHT TELT RIGHT LEFT TILT LEFT a LEG G3 LEG UP a LUE DOWN 3 LEG Dow 3 n Q FU 3 _ i 8 SKY vii ine gt BRAKE UHLE D BRAKE UHLE BATTERY DNIOFE is 6 BATTERY E 600i NE e 6 amp 001KRB OO Figure 7 12 Pendant Control Test Page 51 6001 b Test Results If you do not receive continuity between any of the pins either the micro switch in the Pendant Con trolis defective or awire is broken Either of these problems can be repaired easily If you receive correct readings with the meter t
67. open by the pilot plunger through pump pressure ELEVATION CYLINDER CHECK SPEED VALVE CONTROL PLUNGER SPOOL 1 4 VALVE PRESSURE oF RELIEF VALVE a RESERVOIR Figure 1 16 Elevation Return Circuit i Brake System The brake system consists of the following compo nents figure 1 17 1 Single action slave cylinders 4 each 2 3 way single check valve type mini valve 3 Manually controlled emergency brake re lease 4 Plumbing terminal flexible hoses copper lines and O rings 5 Portions of the electrical system Page 8 BRAKE SYSTEM Ju EMERGENCY BRAKE RELEASE ASSEMBLY Figure 1 17 Brake System Block Diagram Each corner of the cast iron table base has hydraulic brake cylinder These single action cyl inders are hydraulically connected in parallel to the mini valve and all four are activated together It is normalfor one corner ofthe table to raise before the others due to the weight distribution of the table On early models the brakes are activated when the elevation up button on the pendant control is pushed and held down The brakes are completely set when the elevation function table top starts to move upward Later models use an electronic timer in the relay box so that when any function on the pendant control is pushed momentarily the pump motor and brake system mini valve is activated and the brake cylinders are completely set The electronic time
68. or at pin 1 and pin 2 of 19 pin Pendant Control connector Test AC120V indica tor at pin 1 and pin 3 See figure 6 6 If no LED tester is available the LEDs can be tested by applying voltage to the appropriate pins To avoid damage to the LED a 1 5K ohm resistor must be placed between the power source and the connector pins See figure 6 9 R 1 5K OHM Figure 6 9 LED Test d Wiring Harness Test The following test checks the wires leading from the relay box connector to the 19 pin connector table socket These wires apply voltage to the pendant control buttons 1 Activate the AC120V operating mode 2 Disconnect the pendant control from the table base connector All other connectors should be connected 3 Use a DC voltmeter and measure the following pins located in the 19 pin table base connector See figure 6 10 Page 38 Figure 6 10 Table Connector e Test Results If you do not receive the correct voltage reading the wiring or connector pins may be faulty Discon nect connector CN1 from the Relay Box and using an ohmmeter test the continuity between the cor responding pins in connectors CN1 and 14 See figure 6 11 If the correct readings are ob tained this part of the circuit is okay and the problem may be in the relay box 14 EH 14 CH 1 PiHMO Lund PIN ro WIRE COLOR CH 1 COLOR Pandata ray Black White falls Find Purpinl ihin WhitaiAled Yolow
69. ot provided the pump motor would stall because the oil cannot be compressed The pressure relief valve is directly connected to the mini valve bodies and shares both the common internal main pres sure oil galley and the return oil galley that inter nally connect to the reservoir The main component of the valve is an adjustable spring loaded plunger that is pushed off from its seat by the oil pressure The oil then flows back into the reservoir Turning the adjustment nut clock wise increases the amount of oil pressure required to open the valve and turning it counterclockwise decreases the amount of oil pressure See adjust ment section for specification PRESSURE RELIEF ADJUSTMENT NUT SPRING LOADED PLUNGER Figure 1 4 Pressure Relief Valve Not Functioning PRESSURE RELIEF ADJUSTMENT NUT SPRING LOADED PLUNGER Figure 1 5 Pressure Relief Valve Functioning Page3 Mini Valves The operation the mini valves is identical for all table functions except the elevation and Single Action Brake circuits These two hydraulic circuits use a 3 way single check valve type mini valve All other functions use a 4 way dual check valve type mini valve Either type mini valve is controlled by two pushing type electrically operated solenoids The sole noids push the spool valve located in the lower portion of the valve one way or the other This motion opens the main supply galley whic
70. r runs for approx 8 10 seconds The brakes are released by pushing the BRAKE UNLOCK button momentarily An electronic timer in the relay box activates the brake function hy draulic mini valve and pump motor When activated the return hydraulic circuit oper ates similar to the elevation cylinder return circuit Return springs inside the single action brake cylin ders retract the brake pads and provide the pres sure to return the hydraulic oil back to the reservoir The electronic timer operates the return circuit for approximately 8 10 seconds j Emergency Brake Release The emergency brake release is simply a manually operated bypass valve connected in parallel to the brake cylinders and the oil reservoir See figure 1 18 When the valve is opened turned counter clockwise a return circuit for the brake hydraulic fluid is opened The return springs force the pistons up pushing the hydraulic oil back into the reservoir and retracting the brake pads EMERGENCY BRAKE RELEASE LEVER Figure 1 18 IMPORTANT The emergency brake release valve must be tightened securely when not in use elf the emergency brake release valve has been operated the UNLOCK but ton on the pendant control may have to be pressed before brakes will lock again If the emergency brake release valve is open or loose two conditions could occur 1 The brakes will release slowly depending on how loose the valve is this could take anywhere
71. relay switches are activated by the pendant control and in turn energize the solenoid c Hand Held Pendant Control Closes micro switches to activate relay box Operates on 5 VDC d Solenoids These electrically open and close the hydraulic ports of the mini valve to direct the fluid to the correct cylinders They operate on 120 VAC e Motor Pump Assembly 120 VAC 60 HZ 200 Watt capacitor induction motor 4 3 Battery Model Components The functions of the battery model tables are the same as the standard 120 VAC models The electrical components and operation however vary greatly between the two models To simplify the troubleshooting procedures the battery model tables are covered separately in Section VI for the model 6001B and Section VII for the model 6001NB Page 23 SECTION ELECTRICAL SYSTEM TROUBLESHOOTING 5 1 Troubleshooting Notes The basic operation of each component will be defined along with a drawing and explanation on how to check it out NOTE This section does not cover the bat tery table components They are covered separately in Section 6 and 7 Certain defective components could cause the entire table to stop functioning or only one control function to stop It would depend on what part of the componentfailed Other defective components would only cause one control function to stop The following defective components could cause all control functions to be affected a Motor Pump Ass
72. ries require recharging The built in charging system automatically keeps the batteries atthe proper charge level when the AC120V oper ating mode is ON charging system will operate while the table is being operated in the AC120V mode a Battery System Test 1 Disconnect the main power cord and using a DC voltmeter test the voltage of each individual battery at its terminals Meter should read 12VDC 1V 35 6001 2 To accurately test the batteries they must be tested under a full load Disconnect the main power cord and make sure all other connectors are connected 3 Turn BATTERY power ON and elevate the table to its full up position 4 Continue to press the TABLE UP button on the pendant control so that the pump motor contin ues to run and using a DC voltmeter check the voltage drop of each battery individually See figure 6 5 5 Meter should read 12VDC 1VDC BATTERY 2 BATTERY 1 Figure 6 5 b Test Results A reading of 11 volts or below indicates the battery needs charging After batteries have been fully charged repeat the full load test If either battery s voltage drops below 11VDC it should be replaced 6 5 Battery Charging Box The Battery Charging Box contains the battery charging system as well as the transformer and components for the AC120V operation a Battery Charging Box Test 1 Confirm 120 VAC input at CN12 using Main Switch test in 6 3a 2 With
73. rol function a Relay Box b Pendant Control The component listed below would only affect one control function Solenoid When troubleshooting an electrical circuit start at the problem and work back to the power source NOTE On the battery model tables trouble shooting should begin by switching the operating mode For example if a function fails when attempting to oper ate the table in the AC120V mode switch to the BATTERY mode If the function now operates the problem is probably located between the power cord and the relay box If the function alsofails when battery operation use the auxiliary switches to operate the function If the function now operates the problem is probably in the pendant control connectors or wiring from the pendant control to the relay box 6001 6 3 Main Switch The main power supply 120 VAC 60 HZ comes inthrough the power cord and through the main switch The main switch opens both lines when in the OFF position An 8 amp fuse is used to protect the complete electrical system and is located next to the main switch See figure 6 2 a Main Switch Test The following test will determine if line voltage is applied to connector CN12 which in turn would supply 120VAC power to the table 1 Plug the power cord into the 120VAC supply wall receptacle and turn the main switch ON 2 Disconnect connector CN12 See figure 6 1 Leave all other connectors connected CAU
74. rs are single action type similar to the elevation cylinder The movable piston s ram is connected to a brake pad figure 1 15 Oil pumped into the top of the cylinder pushes the piston down raising the table base off its casters Aninternal return spring onthe bottom of the piston pushes the piston up to return the oil through the mini valve to the reservoir RAM Figure 1 15 Single Action Brake Cylinder h Elevation Cylinder Return Circuit Three way single check valve type mini valves control both the elevation and return circuits The elevation circuit operation within the mini valve is identical to the operation of the four way valves previously described inlet pressure opens the check valve allowing the oil to enter the cylinder In the return position inlet pressure pushes the pilot plunger up and opens the return check valve See figure 1 16 The open check valve allows a path for the oil in the elevation cylinder to return to the reservoir When the pilot plunger valve is opened the continuing pump pressure opens the pressure relief valve which provides a return oil path to the reservoir Page7 mini valve used the elevation circuit tains only one check valve all four way mini valves use two check valves The check valve is used to trap the oil in the elevation cylinder thereby supporting the table top When the top is being lowered the check valve is mechanically held
75. s located in the 19 pin table base connector See figure 5 4 NOTE Pin 19 will have no voltage potential un less one of the return to level micro switches are activated i e trend or tilt KR models Pins 17 amp 18 are notused Figure 5 4 Table Base Connector d Test Results If you do not receive the correct voltage reading the wiring or connector pins may be faulty Discon nect connector CN8 from the relay box and using an ohmmeter test the continuity between the corre sponding pins in connectors CN8 and the table base connector Seefigure 5 5 Ifthe correct readings are obtained this part of the circuit is okay White Grange ony Whigalow Binsk hin 1 2 a 4 5 T 8 10 Que eire Figure 5 5 Base Connector Continuity Test 5 4 Relay Box The 120 volt power supply is directly connected to the relay contacts When these contacts are closed 120 volts is supplied to the solenoids which are mounted on the hydraulic mini valves One relay is used to supply 120V to the pump motor and is always activated no matter what control function is selected The brake locking circuit relay is also activated when any control function other than BRAKE UNLOCK is initially selected Also inside the relay box is a step down transformer and full wave rectifier which decreases the line volt age to 5 5 volts This low voltage potential controls the relays by the use of the hand held pend
76. s obtained Pressure should be 80KG CMT 1138 PSI d Speed Controls The speed controls restrict the volume of oil return ing back to the reservoir thereby controlling the speed of each control function All four way mini valves have two speed controls located in the ends of each valve body All three way mini valves have only one speed control One speed control adjusts one direction of a particular function and the opposite speed control adjusts the other direction They are adjustable by using a small straight blade screwdriver and turning the adjustment screw clockwise to de crease the speed and counterclockwise 10 increase the speed Refer to figure 1 22 TREND on TILT RIGHT Figure 1 22 Any control function should move in either direc tion atthe same rate Ifthe rate of acertain function is too slow open the speed control slightly and recheck Use the second hand on a watch and time a particular function Match that time in the oppo site direction by opening or closing the speed control Approximate operating times are as fol lows Lateral Tilt 7 seconds Back Up 25 seconds Back Down 15 seconds A pressure gauge should be used to set the speed of the back section trendelenburg and flex control functions To adjust 1 Attach the pressure gauge onto the main oil galley as shown in figure 1 21 2 Thegauge should read the following values when operating the various control functions in either direct
77. s the speed of the table function by restrict ing the amount of oil going back into the reservoir f Mini Valve Left Port Activated See figure 1 8 Slave Oylinder Piston Moves to Right Left Mini Valve Port is Supply Line Right Mini Valve Port is Return Line OUTLET INLET Figure 1 8 Mini Valve Left Port Activated 1 Spool Valve Pushed to the right by electric solenoid This opens the internal oil pressure gal ley allowing the fluid to go through the check valve and onto the cylinder Also the spool valve opens the oil return line providing an oil path through the internal oil galley back to the reservoir 2 Pilot Plunger Valve Right pilot plunger valve is pushed up by the incoming oil pressure mechani cally opening the check valve located above it in the return circuit This action allows the oil from the right side of the slave cylinder to go back into the reservoir The left pilot plunger valve is not affected in this operation mode 3 Check Valves Both check valves are opened in this operation mode The left valve is pushed open by the oil pressure created by the pump The oil then continues to go through the lines and pushes the slave cylinder piston to the right Atthe same time the right check valve is held open mechanically by the pilot plunger providing a return path for the oil through the mini valve back to the reservoir
78. switch and wiring to Page 48 connector CN15 Remove the power cord discon nect CN15 black and white wires and test as shown in figure 7 4 TO GHOUNMD L Figure 7 4 CN15 ICN1 Continuity Test 7 4 Batteries The BATTERY operating mode is powered by two 12 volt batteries connected in series to provide the 24 volt operating power The battery system voltage should be 24VDC ata range of 22VDC to 26VDC If the battery charge level falls below 23 5 volts the BATTERY operation indicator on the pendant control will blink indicating that the batteries require recharging The built in charging system automatically keeps the batteries at the proper charge level when the AC120V oper ating mode is ON The charging system will oper ate while the table is being operated in the AC120V mode a Battery System Test 1 Disconnect the main power cord and using a DC voltmeter test each individual battery at its terminals Meter should read 12VDC 1V 2 To accurately test the batteries they must be tested under a full load Disconnect the main power cord and make sure all other connectors are connected 3 Turn BATTERY power ON and elevate the table to its full up position 4 Continue to press the TABLE UP button on the pendant control so that the pump motor contin ues to run and using a DC voltmeter check the voltage drop of each battery individually See figure 7 5 5 Meter should read 12VDC 1VDC 6
79. ted ee 12 2 2 Hydraulic Cylinder Adjustment 12 BACK ciel ec 12 Log SOCOn E 12 2 3 Split Leg Section Horizontal Adjustments Model 6000 13 2 4 Adjustable Brake Feet 13 SECTION Ill HYDRAULIC TROUBLESHOOTING teen 14 Precautions tte 14 9 2 Troubleshooting Notes ieies of edu 14 3 3 ELEVATION DIAGNOSIS CHART 5i tr e ete th i e enh 15 3 4 TRENDELENBURG DIAGNOSIS CHART espe 16 3 5 LATERAL TILT DIAGNOSIS CHART tt er ro exte Eel Reed etti 17 3 6 FLEX SYSTEM DIAGNOSIS CHART iie ee po hei rui eren RO ANNO RENS NUES 18 3 7 BACK SECTION DIAGNOSIS CHART ertet eter tenet tere Pate ence d teret rune 19 3 8 LEG SECTION DIAGNOSIS CHAR te Dicto sets cd bolsos e Cosi 20 3 9 BRAKE CIRCUIT DIAGNOSIS CHART rn bebe onn 21 3 10 Flexible Hose Identification and mmn 22 Although current at time of publication SKYTRON s policy of continuous development makes this manual subject to change without notice REV 3 00 Table of Contents continued SECTION IV ELECTRICAL SYSTEM tr aeree risen tube Ro a EE RU ER a e dan EE 23 RING ea Ns Sie T
80. th a DC voltmeter DO NOT disconnect connector CN4 Meter should read approximately 24 volts when any function button is activated Refer to figure 6 14 for pin locations d Checking Output to Pendant Control NOTE The Relay Box connectors CN1 Pen dant Control CN8 Auxiliary Base Con nector and CN9 Auxiliary Switches are interchangeable 1 Disconnect the Pendant Control connector from the base connector connect all other connec tors and use a DC voltmeter to measure the follow ing sockets located in the table base connector CN14 See figure 6 15 for pin locations NOTE A fine wire or a paper clip may be needed to accurately test the small sockets in the connector The connec toris low voltage and there is no danger of electrical shock Figure 6 15 Connector CN14 6001 Test Results If you do not receive the correct meter readings the relay box or wiring is defective If the correct readings are obtained this part of the relay box is okay Proceed to the next step f Checking Output to Solenoids This test checks the voltage that is used to energize the solenoids NOTE Brake Lock function is activated by pressing any function button except BRAKE UNLOCK A timer in the Relay Box allows continuous output for about 7 seconds If the brakes are already locked no output is provided The BRAKE UNLOCK button activates another timer in the relay box which allows continuous output
81. ting a known good unit or wire connector In some cases this may be faster than using a multi meter Figure 5 8 Solenoid Test Page 30 5 6 Motor Pump Assembly The electric motor is a capacitor start type with a rating of 120 VAC 200 watts The field windings are protected with a thermal protector that will open the winding circuit if the motor is run continuously for approximately 10 minutes This protector will take about 10 minutes to automatically reset The oil pump unit is attached to the bottom of the motor and is a gear type displacement pump with a pumping capacity of 4 liter per min The Motor Pump Assembly is mounted onan insulated motor plate inthe base ofthe table The starting capacitor is mounted along side the motor pump assembly a Motor Pump Test The following tests will check the voltage applied to the motor and the resistance of the motor field windings CAUTION Line voltage will be measured in this test Do not touch uninsulated connec tor pins or meter test leads b Step 1 1 Plug the power cord into 120 VAC power supply wall receptacle Turn main switch ON 2 Disconnect the 3 pin connector CN15 at the motor Leave all other connectors connected See figure 5 9 PUMP MOTOR ASSEMBLY Y M CHIS P CAPACITOR Figure 5 9 3 Use a voltmeter capable of measuring 120 VAC and measure the following connector pins in connector CN15 See figure 5 10
82. tric cams for the back section a Back Section Position the back section all the way up until it stalls Both sides of the back section should stop Page 12 moving at the same time and should not show any signs of twisting Any twisting or flexing of the back section as it approaches the stalled position indicates that one of the cylinders is not reaching its fully extended position at the same time as the other This condition would require an adjustment To adjust Loosen the cam locking nuts located inside the table side frames Use a spanner wrench to turn the cylinder eccentric cams as required to shift either cylinder fore or aft as needed so no twisting or flexing of the back section is observed when itis stalled in the full up position See figure 2 2 BACK SECTION e BACK SECTION CYLINDER SPANNER 4r WRENCH TABLE SIDE FRAME Figure 2 2 Back Section Adjustment b Leg Section Model 6001 Position the leg section all the way up Both sides of the leg section should stop moving at the same time and should not show any signs of twisting Any twisting or flexing of the leg section as it approaches the stalled position indicates that one of the cylinders is not reaching its fully extended position at the same time as the other and an adjustment is required To adjust Loosen the cam locking nuts located inside the table side frames Use a spanner wrench to turn the cylinder
83. ts Ensure that all table functions operate properly using the Pendant Con trol If the functions do not work properly using the Pendant Control refer to the appropriate test sec tion and make all needed repairs before working on the return circuits i ceee ee 1 1 1 I 1 VIEW 1 1 1 1 1 1 1 1 1 Trisudalenburng Fre Trixestalanburng Lateral Tit Let TIE Back Smin Back Doran Lawal Back Section Back Up Levell Figure 5 12 Page32A Itis normal for the back section to move operation at the appropriate pin numbers for the micro switch in question as shown in figures 5 14 through 5 18 up if the RETURN button is pushed when connector CN2 is disconnected from the relay box All of the micro switches are connected to the relay box via a wiring harness and the micro switch riser cord using connectors CN2 and CN10 Connector CN10is located under the slider shroud inthe same area as the hydraulic hoses Connector CN2 plugs into the relay box and is the most convenient location to make circuit continuity checks See figure 5 13 for connector pin locations a Switch Test Turn Main Power ON lock the table brakes and place the table top sections in a level position Disconnect connector CN2 from the relay box and using an ohmmeter test the wiring and switch BACK UP BACK DOWN HS 5 TILT RIGHT Be sure to isolate the circuit w
84. ure and the other side having no load Page 4 Also by using this control method it doesn t matter what size cylinder and piston is used because the speed can be controlled by restricting the return oil Ifthe pump puts out more volume to acertain slave cylinder than the speed control is allowing to go back to the reservoir the pressure relief valve provides an alternate path for the pump oil d Mini Valve in Neutral Position No fluid flow See figure 1 6 1 Spool Valve Centered This closes off both oil pressure and oil return galleys 2 Pilot Plungers Both Closed The pilot plung ers control the opening of the check valves If they are closed the check valves must be closed 3 Check Valves Both check valves are closed trapping the oil in the cylinder and oil lines 4 Speed Adjustment When the mini valve is in the neutral position the speed adjustment does not affect anything because there is not any oil flow BALL OIL LINE VALVE OIL LINE 0 SPEED D s dip ex d CONTROL E m8 a PILOT E PLUNGER CHECK eyar VALVE J e OIL GALLERY OILRETURN SPOOL SOLENOID PRESSURE RETURN VALVE PISTON Figure 1 6 Mini Valve in Neutral Position Mini Valve Right Port Activated See figure 1 7 Slave Cylinder Piston Moves to Left Right Mini Valve Port is Supply Line Left Mini Valve Port is Return Line

SKYTRON Elite 6000 O/R Table Service Manual

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