SERVICE MANUAL - HWH Corporation
Contents
1. REFER TO MP85 192C MI91 2128 29JUN04 TROUBLE SHOOTING PROBLEM 4g One or more jacks will not retract while the DOWN ARROW is being pushed NOTE Remember when checking for voltage or grounds all harnesses must be plugged in and a DOWN ARROW must be pushed SOLUTION CAUTION VEHICLE MUST BE PROPERLY SUPPORTED SO THE VEHICLE CAN NOT DROP IF PERFORMING A TEST WOULD PLACE A TECHNICIAN UNDER THE VEHICLE Check the YELLOW and RED LED s for the jacks that will not retract If both LED s are lit Manually open the solenoid valve for the jack that will not retract If the jack does not retract loosen the hose for the jack s that will not retract This can be done at the jack or hydraulic manifold IMPORTANT This may cause the vehicle to drop and cause a loss of fluid If the jack does not retract replace the jack If the jack retracts the problem may be the check valve or the velocity valve if so equipped With the solenoid valves closed and the system off remove the outer check valve Replace the cap and retry If the jack retracts replace the check valve If the jack does not retract replace the velocity valve If the jack retracts when the solenoid valve is manually opened check for voltage at the solenoid valve for the jack s that will not retract If voltage is present replace the solenoid valve If voltage is not present there is a conne2. the 9300 wire that is in the 12 BLACK connector CN5 ao om at the control box or the HWH air valve or pilot valve is shorted Em Note There is one 9300 wire from the control box to control e the dump valves either HWH valves or the chassis pilot dump E m 4 If the fuse is not blown replace the control box REFER TO 85 2195 HWH AIR DUMP VALVES If the YELLOW 11 LED and the RED 12 LED are both lit check for 12 the 9300 wire ground the white wire at the HWH air dump valves or at the four pin UML plug if the vehicle is equipped with a pilot dump system If power and ground is present there is a problem with the dump valves or the pilot dump system if so equipped Contact the vehicle manufacturer for assistance with a pilot dump system 9310 DUMP 9311 TRAVEL 6231 GRND Note If the vehicle is equipped with HWH dump valves make sure the exhaust port for the valve is not plugged REFER TO MP85 2215 If power is not present at the valve or four pin UML plug the PILOT DUMP SYSTEM problem is with the 9300 wire the ground wire or their PLOT BUM SYS connections MI91 2168 28JUL04 TROUBLE SHOOTING PROBLEM SOLUTION DIAGRAM For vehicles that Make sure there i
3. SERVICE MANUAL HWH TOUCH PANEL CONTROLLED 305 325 SERIES LEVELING SYSTEM FEATURING Touch Panel Leveling Control BI AXIS Hydraulic Leveling Central Grounding Straight Acting Jacks With or Without Air Dump HWH HYDRAULIC LEVELING lo STORE L O O O CAUTION UNDERSTAND OPERATOR S MANUAL BEFORE USING BLOCK FRAME AND TIRES SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE HWH CORPORATION On 1 80 Exit 267 South 2096 Moscow Road Moscow lowa 52760 Ph 800 321 3494 or 563 724 3396 Fax 563 724 3408 www hwh com ML33832 MI91 0025 10JAN05 SECTION 1 4 2 2 PART FOLDER HOW TO USE MANUAL This manual is written in two sections Section 1 is the Trouble Shooting Guide Section 2 is the figures Begin diagnosis of the system with Section 1 the Trouble Shooting Guide The Trouble Shooting Guide describes system operation with each phase of operation followed by symptoms of possible problems The problem section is broken into 3 columns Problem Solutions and Figures Under Problems find the symptom you have encountered The testing and repair for that problem is in the Solution center column Diagrams for a particular Problem and Solution are in the Figures right hand column This column will direct you to the proper figure in Section 2 Figures for a more detailed view Before beginning your repair it is IMPORTANT to read the CAUTIONS and N
4. are on 2b The pump runs Unplug CN2 from the control box if the pump continues to at this time run replace the control box If the pump stops replace the Touch Panel REFER TO MP85 206C Part 3 With the ignition in the ACC position push the LEVEL I button The red LEVEL MODE light should glow steady One or two yellow LEVEL lights may be on No other lights should be on The pump should not run If the vehicle is equipped with an air suspension the air will dump from the suspension when the Touch Panel is turned on If the Touch Panel comes on but will not dump at this time see part 6 PROBLEM SOLUTION DIAGRAM 3a The Level Mode Check PIN 1 wire number 6120 of connector CN1 of the Touch light will not come Panel There should be a good 12 volt signal with the ignition on when the LEVEL in the ACC position Check PIN 3 wire number 6230 of button is pushed connector CN3 of the Touch Panel This should be a good p ground If 12 volts and ground is present replace the Touch REFER TO MP85 192C Panel MI91 2068 31JUL07 TROUBLE SHOOTING PROBLEM 3b The LEVEL MODE light will come on but will not stay on when the LEVEL button is released 3c More than two or opposite yellow level lights are on 3d A red warning light is on no jacks are extended 3e The pump runs when the touch panel is turned on 3f The air
5. INDICATOR SHOULD ALWAYS BE USED WHEN THE LEVELING SYSTEM HAS STRAIGHT ACTING JACKS A WARNING BUZZER MUST BE USED NOTE BY SUPPLYING IGNITION POWER TO THE WARNING BUZZER AND LIGHT AND ACC POWER TO THE CONTROL BOX THE SYSTEM MAY BE OPERATED ACCESSORY WITHOUT THE BUZZER SOUNDING THE NEGATIVE SIGNAL FOR THE WARNING INDICATORS MUST ALWAYS COME FROM THE TOUCH PANEL E CONNECT THIS END TO 12 VOLT IGNITION E SEE TOUCH PANEL 9 PIGTAIL W DIODE CEA JACK AND IN LINE FUSE HOLDER 6121 DOWN r LIGHT J BUZZER PIGTAIL PROVIDED 7699 85 3040 105 02 READ pINSIHUCHONS ELECTRICAL CONNECTION DIAGRAM A BEFORE ELECTRONIC SENSING UNIT JUMPER PLACEMENT PROCEEDING 5 777 IMPORTANT 325 AND 625 ELECTRONIC SENSING UNITS USED AFTER MARKET INSTALLATIONS OR REPLACEMENT SITUATIONS ARE PROGRAMMABLE DURING INSTALLATION OF A SYSTEM OR REPLACEMENT OF AN ELECTRONIC SENSING UNIT DO NOT ASSUME THAT THE SENSING UNIT JUMPERS ARE PRE SET THE MOUNTED ORIENTATION OF THE CONTROL BOX ASSEMBLY AND THE SUSPENSION TYPE MUST BE ESTABLISHED IN ORDER TO SET THE JUMPERS AS NEEDED TO PROGRAM THE SENSING UNIT TO THE COACH JP1 AND JP2 CONTROL BOX ORIENTATION Page 1 of 2 MOVE JUMPERS JP1 AND JP2 ACCORDING TO THE ORIENTATION OF THE CONTROL BOX USE THE DRAWI
6. THEY ARE SHIPPED WILL NOT CAUSE PROBLEMS JP4 JP3 JP2 JP1 SHIPPED MOVED POSITION POSITION THE FOLLOWING DRAWINGS SHOW THE SENSING UNIT INSIDE THE CONTROL BOX AS VIEWED WHEN LOOKING DOWN FROM THE TOP OF THE CONTROL BOX REMOVE THE RUBBER RING AND PLASTIC COVER ONLY IF NEEDED THE RING AND COVER MUST BE REINSTALLED FRONT OF VEHICLE FRONT OF VEHICLE 4321 5 o Ab JUMPERS m d MOVE JP1 ONLY PLEXIGLASS PLEXIGLASS di JUMPERS T J L LEAVE JP1 AND JP2 AS ml Dj SHIPPED AN E gal FRONT OF VEHICLE FRONT OF VEHICLE PLEXIGLASS Hs WS lt 1 5 95 nre lk 4 QU d E AS 4 16 H zz 2 TF E D O 8 JUMPERS PLEXIGLASS JUMPERS MOVE JP2 ONLY MOVE JP1 AND JP2 NOTE AFTER MOVING THE JUMPERS REMOVE AND REAPPLY 12 POWER MP45 272M MI15 100A FOR THE CONTROL BOX THIS WILL RE BOOT THE SENSING UNIT 175 07 2 H H H IMPORTANT 325 AND 625 ELECTRONIC SENSING UNITS USED IN AFTER MARKET INSTALLATIONS OR REPLACEMENT SITUATIONS ARE PROGRAMMABLE DURING INSTALLATION OF A SYSTEM OR REPLACEMENT OF AN ELECTRONIC SENSING UNIT DO NOT ASSUME THAT THE S
7. VALVE SOL VALVE VALVE LR LF RF RR INNER lt lt CHECK TIR Prel Ty OUTER A X X LEFT RIGHT FRONT FRONT JACK l CYLINDER LEFT 65 3005 07MARO03 ELECTRICAL CONNECTION DIAGRAM 305 325 SERIES LEVELING SYSTEM TOUCH PANEL CONNECTIONS u TORAR HWH HYDRAULIC LEVELING e FROM 12 SEE ELECTRICAL SWITCH FUSE 8720220 15 DIAGRAM MASTER BIS 6120 WARNING LIGHT BUZZER 9000 mne 7699 0 CAUTION PARK BRAKE e SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE SWITCH 9000 NOTE THERE MAY BE A CONNECTOR BETWEEN THE PARK BRAKE HARNESS AND THE TOUCH PANEL a 6235 2000 IRE ff LF 1000 6235 RFE uU TOUCH PANEL CONTROL BOX WARNING CONNECTION SWITCH CABLE HARNESS NOTE SEE ELECTRICAL CONNECTION DIAGRAM 305 AND 325 SERIES LEVELING SYSTEM TOUCH PANEL FOR TOUCH PANEL CONNECTION INFORMATION SEE ELECTRICAL CONNECTION DIAGRAMS CONTROL BOX PUMP MANIFOLD C
8. assistance NOTE Make sure the white wires of the harness and warning switch are in the A pins of the Packard connectors The black wires must be in the B pins of the connectors If the warning light does not go out with the warning switch unplugged remove the wire for that switch from CN5 at the touch panel If the light goes out the wire is shorted to ground If the light does not go out replace the touch panel Disconnect the 7699 wire from the CN1 connector at the touch panel If the master warning light and buzzer turn off replace the touch panel If they remain on the 7699 wire is shorted to ground DIAGRAM FOR JACK RETRACTION SOLENOID VALVES REFER TO MP65 270C REFER TO MP85 192C war pus PIN 12 Hee Ree REFER TO MP85 206C REFER MP85 192C NO gt e 2 REFER 85 192 MI91 2148 15 08 TROUBLE SHOOTING Part 5 STORE button The STORE button is used to retract all of the jacks at the same time The STORE button will also put the suspension in the TRAVEL MODE if the vehicle is equipped with a pilot air dump system The LEVEL MODE light must be OFF to use the STORE button The STORE button will not work if the LEVEL MODE light is ON The ign
9. not terminals 1 2 and 3 of the pump relay Terminal 4 is a ground 8600 1 run when the supplied by the park brake switch Terminal 1 is battery power to 5 E x1 FROM ARROW is pushed the relay Terminal 2 is switched 12 power to the pump motor Try a different UP Make sure all pump assembly mounts are tight and that the ARROW If the assembly has a adequate ground for the pump motor Terminal 3 pump runs replace is switched 12 volts to control the relay Terminals 1 2 and 3 the Touch Panel should have a minimum of 9 0 volts when trying to run the pump Check LED 9 yellow and LED 10 red for the pump relay in the REFER TO MP85 2195 Control Box If both LED s are lit Check terminal 3 of the pump relay If power is present skip to the next paragraph If power is not present the problem is with the connections CN2 PIN 12 or the wire 8600 If the yellow LED is lit but but not the red Check the fuse If the fuse is check the 6100 wires the rs 4 PIN gray connector for 12 volts If voltage is present replace the Control If voltage is present the problem is the 6100 wire connections at the pump relay or power from the battery TA e Check that the CN2 brown connector is plugged in properly This connector can be plugged in upside down If the fuse is bad the problem is the 8600 wire or
10. the pump relay If the yellow LED is not Check CN1 12 of the control box for 12 volts and PIN 11 for ground If PIN 12 has 12 volts and PIN 11 has a ground replace the Control Box If PIN 12 has no voltage check REFER TO MP85 212C CN3 PIN 1 at the Touch Panel If voltage is present the problem is the connection or wire 6120 of that harness If voltage is not present replace the Touch Panel If PIN 11 1 of the control f box has no ground check CN3 PIN 10 at the Touch Panel If PIN 10 has ground the problem is the connections or wire 8600 EIU PIN 12 N BROWN CN2 If PIN 10 has no ground replace the Touch Panel If there is no power on terminal 1 check connection to the battery the battery and the ground connections for the battery If there is power on terminals 1 2 and 3 the problem is connections to the pump motor or the pump motor itself REFER TO MP85 206C AND If there is power on terminals 1 3 ground on terminal 4 REFER TO 85 207 but no power on terminal 2 the pump relay is bad If there is no ground on terminal 4 check CN2 PIN 7 If ground is present the connections wire 9000 is the problem If there 9 is no ground on PIN 7 check 1 PIN 7 for ground If there is ground replace the Control Box If there is no ground in PIN 7 CN1 the problem is t
11. will not dump from the suspension when the Touch Panel is turned on SOLUTION Use a volt meter to check between PIN 1 of connector CN1 and PIN of connector CN3 of the Touch Panel while pushing the LEVEL button If there is less than 11 volts there is a wire connection or battery problem If there is 12 volts while pushing the LEVEL button replace the Touch Panel With the panel on unplug the Sensing Unit connector CN4 Use a test light to ground pins 2 rear 3 right side 4 front and 5 left side If the correct light does not come on at once replace the Touch Panel If the Touch Panel works properly plug in CN4 at the Touch Panel and unplug CN3 at the Control Box Use a test light to ground PIN 1 rear 2 right side 3 front and 4 left of the harness plug If the correct light does not come on or two lights come on the harness is the problem If the panel lights work properly replace the Sensing Unit Unplug the CN2 connector at the Touch Panel If the warning light remains on replace the Touch Panel If the warning light s goes out plug the CN2 connector back in and unplug the warning switch at the jack If the warning light remains on the harness is bad If the light goes out the problem is probably the warning switch If a new switch does not fix the problem the magnet in the cylinder may be bad NOTE Make sure the white wires of the harness and warning switch are in the A pins of the Packard co
12. ACK 9301 3 GROUND WHITE 6230 2 NOT USED KEY PIN 1 ACCESSORY BLACK 6121 NOTE FOR WIRE FUNCTION INFORMATION SEE ELECTRICAL CONNECTION DIAGRAM TOUCH PANEL WIRE LEGEND MP85 192C O9JUN04 ELECTRICAL CONNECTION DIAGRAM TOUCH PANEL WIRE LEGEND WIRE WIRE COLOR NUMBER 1 RED 6120 2 3 4 BLACK 7699 5 CN2 1 WHITE 6235 2 3 BLACK 1000 4 BLACK 2000 5 BLACK 3000 6 BLACK 4000 CN3 1 BLACK 6121 2 3 WHITE 6230 4 BLACK 9301 5 BLACK 9300 6 BLACK 1400 7 BLACK 4400 8 BLACK 3400 9 BLACK 2400 10 BLACK 8600 11 BLACK 8110 1 RED 6122 2 ORANGE 0400 3 GREEN 0300 4 BLACK 0200 5 YELLOW 0100 6 7 WHITE WIRE DESCRIPTION AND FUNCTION 5 PIN CONNECTOR 12V ACC POWER KEY PIN NO CONNECTION NO CONNECTION SWITCHED GROUND FOR WARNING LIGHT BUZZER CONTROL NO CONNECTION 6 PIN CONNECTOR GROUND FOR JACK WARNING SWITCHES KEY PIN NO CONNECTION SWITCHED GROUND FOR LF WARNING LIGHT SWITCHED GROUND FOR RF WARNING LIGHT SWITCHED GROUND FOR RR WARNING LIGHT SWITCHED GROUND FOR LR WARNING LIGHT 11 PIN
13. ACK 8600 SWITCHED 412 FOR PUMP RELAY CN3 8 PIN GRAY CONNECTOR SENSING UNIT 1 BLACK 0400 REAR SWITCHED GROUND 2 BLACK 0300 RIGHT SIDE SWITCHED GROUND 3 BLACK 0200 FRONT SWITCHED GROUND 4 BLACK 0100 LEFT SIDE SWITCHED GROUND 5 THRU 7 NO CONNECTION 8 BLACK 6122 ACCESSORY MP85 206C 09JUN04 ELECTRICAL CONNECTION DIAGRAM 325 SERIES LEVELING SYSTEM CONTROL BOX CONNECTION INFORMATION PAGE 2 OF 2 BROWN CN2 PIN 1 BLACK CN5 FOR AIR DUMP PIN 1 PIN 4 TO PUMP RELAY AND GROUND STUD WIRE WIRE PIN COLOR NUMEEE WIRE DESCRIPTION AND FUNCTION GRAY CONNECTOR 1 RED 6100 2 RED 6100 WHITE 6230 4 WHITE 6230 CN5 1 THRU 5 6 WHITE 6230 7 BLACK 9300 8 THRU 12 4 PIN GRAY CONNECTOR 12V BATTERY POWER FROM PUMP RELAY 12V BATTERY POWER FROM PUMP RELAY GROUND FROM HWH GROUND STUD GROUND FROM HWH GROUND STUD 12 PIN BLACK CONNECTOR NO CONNECTION GROUND FOR AIR DUMP VALVES SWITCHED 12 TO AIR DUMP VALVES NO CONNECTION MP85 207C 09JUN04 ELECTRICAL CONNECTION DIAGRAM LED FUSE LOCATION AND DESCRIPTION 305 325 CONTROL BOX P 2am 258 835 288 a gt ao ast 025 UZ D cd wal
14. CHECK LR RF RR SHUTTLE VALVES 4 2 VALVE NOTE SOME MANIFOLDS S ARE EQUIPPED 50PSI WITH VELOCITY PRESSURE VALVES h SWITCH Q PUMP MANIFOLD ASSEMBLY LARGE VALVE WITH RELEASE NUT LOCATED ROOM EXTENSION MANIFOLD NOT SHOWN VELOCITY VALVE Hl RIGHT REAR 65 270 080CT07 HYDRAULIC SCHEMATIC 305 310 325 SERIES LEVELING SYSTEM WITH STRAIGHT ACTING JACKS 7 RELIEF VALVE lt A 12 VOLT D C WERT SOLENOID MANIFOLD ASSEMBLY RETURN PRESSURE SHUTTLE VALVE 50 SWITCH Em w SOL VALVE SOL VALVE SOL
15. CONNECTOR 12V ACC POWER FOR CONTROL BOX KEY PIN NO CONNECTION CHASSIS GROUND FROM CONTROL BOX SWITCHED GROUND TO CONTROL BOX FOR TRAVEL SWITCHED GROUND TO CONTROL BOX FOR DUMP SWITCHED GROUND TO CONTROL BOX FOR LF SOLENOID VALVE SWITCHED GROUND TO CONTROL BOX FOR LR SOLENOID VALVE SWITCHED GROUND TO CONTROL BOX FOR RR SOLENOID VALVE SWITCHED GROUND TO CONTROL BOX FOR RF SOLENOID VALVE SWITCHED GROUND TO CONTROL BOX FOR PUMP RELAY SWITCHED GROUND TO CONTROL BOX FOR PRESSURE SW OVERIDE 7 PIN CONNECTOR 412V ACC POWER FOR LEVEL SENSING UNIT SWITCHED GROUND FOR REAR LEVEL LIGHT SWITCHED GROUND FOR RIGHT SIDE LEVEL LIGHT SWITCHED GROUND FOR FRONT LEVEL LIGHT SWITCHED GROUND FOR LEFT SIDE LEVEL LIGHT KEY PIN NO CONNECTION GROUND FOR LEVEL SENSING UNIT MAY NOT BE USED MP85 194C 18 05 ELECTRICAL CONNECTION DIAGRAM 325 SERIES LEVELING SYSTEM CONTROL BOX CONNECTION INFORMATION PAGE 1 OF 2 TOLEVELING BROWN CN2 N SYSTEM T MANIFOLD E PIN 1 PIN 12 BLACK CN5 PIN 1 SRAN PIN 1 GRAY Nee GRAY J TAY Jf m PIN 12 w PIN 8 TOUCH PANEL WIRE WIRE PIN COLOR NUMBER WIRE DESCRIPTION AND FUNCTION CN1 12 PIN GRAY CONNECTOR 1 BLACK 1400 SWITCHED GROUND FROM TOUCH PANEL LEFT FRONT CO
16. DIAGRAM 305 325 SERIES POWER UNIT LEVELING MANIFOLD RELAY PILOT AIR DUNP LEVEL CONTROL HARNESS FROM CONTROL PANEL KER SRS SERRE RRR RY xD OI CSI X f BROWN BLACK LEVELING MANIFOLD i E Scd 1 8 _ PUMP lass LU e RELAY 5 5 e RLI lt lt x 1 4 TO BATTERY d TO GROUND 4546 STUD 2 9310 DUMP 9311 TRAVEL e 6231 gt lt Nen SES PRESSURE SWITCH 50PSI S a NOTE THE FOUR PIN UML oor JF 7 CONNECTOR FOR THE PILOT ls x DUMP MAY BE IN THE TOUCH 6241 1 LEVELING HARNESS 2400 E 72 159 MANIFOLD i O 6242 a o 1400 22222 pgs 6243 de 7o 4400 m p LR Q IEE 6240 PUMP RELAY N 8600 22 48 o J PUMP COACH MOTOR BATTERY 9000 MP85 2215 29JUN04 MASTER LIGHT BUZZER CONNECTION DIAGRAM MANUAL LEVELING SYSTEMS 305 310 325 SERIES LEVELING SYSTEM A MASTER WARNING
17. ENSING UNIT JUMPERS ARE PRE SET THE MOUNTED ORIENTATION OF THE CONTROL BOX ASSEMBLY AND THE SUSPENSION TYPE MUST BE ESTABLISHED IN ORDER TO SET THE JUMPERS AS NEEDED TO PROGRAM THE SENSING UNIT TO THE COACH JP3 AND JP4 CONTROL SUSPENSION TYPE Page 2 of 2 MOVE JUMPERS JP3 AND JP4 ACCORDING TO THE TYPE OF SUSPENSION ON THE VEHICLE JUMPERS JP3 AND JP4 DETERMINE SUSPENSION TYPE SPRING LEAVE JUMPERS AND JP4 AS SHIPPED NEITHER JUMPER NEEDS TO BE MOVED AIR LEAVE JUMPER JP4 AS SHIPPED MOVE JP3 ONLY DIAGRAM BELOW SHOWS AIR SUSPENSION SETUP x E Ze MP45 273M 15 100 175 7 HYDRAULIC LINE CONNECTION DIAGRAM 305 325 SERIES LEVELING SYSTEM WITH 4 STRAIGHT ACTING JACKS LEFT REAR NOTE BEFORE OPERATING ANY MANUAL VALVE RELEASE READ AND UNDERSTAND PROCEDURE FOR MANUAL JACK RETRACTION IN OPERATOR S INSTRUCTIONS THIS MANIFOLD IS SHOWN WITH 1 LARGE VALVE WITH A VALVE RELEASE T HANDLE 2 SMALL VALVES WITH VALVE RELEASE NUTS AND 1 LARGE VALVE WITH A VALVE RELEASE NUT BREATHER CAP SMALL VALVES WITH RELEASE NUTS LARGE VALVE UNDER WITH RELEASE PLASTIC PLUG T HANDLE gt ui CHECK PUMP PRESSURE HERE TN
18. ING UNIT JUMPER PLACEMENT PROCEEDING 5 lt 5 PSA SA BS IMPORTANT 325 AND 625 ELECTRONIC SENSING UNITS USED IN AFTER MARKET INSTALLATIONS OR REPLACEMENT SITUATIONS ARE PROGRAMMABLE DURING INSTALLATION OF A SYSTEM OR REPLACEMENT OF AN ELECTRONIC SENSING UNIT DO NOT ASSUME THAT THE SENSING UNIT JUMPERS ARE PRE SET THE MOUNTED ORIENTATION OF THE CONTROL BOX ASSEMBLY AND THE SUSPENSION TYPE MUST BE ESTABLISHED IN ORDER TO SET THE JUMPERS AS NEEDED TO PROGRAM THE SENSING UNIT TO THE COACH JP3 AND JP4 CONTROL SUSPENSION TYPE Page 2 of 2 MOVE JUMPERS JP3 AND JP4 ACCORDING TO THE TYPE OF SUSPENSION ON THE VEHICLE JUMPERS JP3 AND JP4 DETERMINE SUSPENSION TYPE SPRING LEAVE JUMPERS JP3 AND JP4 AS SHIPPED NEITHER JUMPER NEEDS TO BE MOVED AIR LEAVE JUMPER JP4 AS SHIPPED MOVE JP3 ONLY DIAGRAM BELOW SHOWS AIR SUSPENSION SETUP x E Ze MP85 451D 29JUN04
19. M WITH THE CONTROL BOX TOUCH PANEL OR CONNECTION CABLE MP85 212C 09JUNO04 ELECTRICAL CONNECTION DIAGRAM 305 325 SERIES POWER UNIT LEVELING MANIFOLD RELAY OPTIONAL HWH AIR DUMP LEVEL CONTROL HARNESS FROM CONTROL PANEL BROWN Y ES 38 FA LEVELING MANIFOLD 7 Wo TO BATTERY Sic d TO GROUND a 6230 AIR DUMP STUD VALVE u 6230 9900 Bl AIR DUMP DUMP DUMP 900 a100 eo L 6230 5368 B a mm NOTE AIR DUMP Sop E nn P 5 AND 3 50 PSI VALVES ARE NOT 2400 _ rS PRESSURE USED ON ALL Ea gt SYSTEMS SYSTEMS cj SWITCH S242 l IS a WITH HWH AIR DUMP is VALVES MAY HAVE 1400 O DIFFERENT VALVE oe LF cee LEVELING THEN SHOWN 4400 r MANIFOLD 4 P lt LR E 6240 i 1 PUMP RELAY 8600 P 48 MO 1 O O O 5 AIR DUMP 3 P 4 5 VALVE 9300 TO FROM PUMP COACH MOTOR BATTERY 24 9000 6230 85 2195 29JUN04 ELECTRICAL CONNECTION
20. N properly LED S LOCATION MAY DIFFERENT D O 55 B SIDE VIEW CONTROL BOX ADJUSTMENT NUT 5 16 OLD 1 2 NEW OLD STYLE ADJUSTMENT 7 8 or 3 4 CONTROL BOX WALL 1 OLD STYLE J ADJUSTMENT ADJUSTMENT SCREW Phillips 1 4 NUT 7 8 or 3 4 TN ADJUSTMENT SCREW ADJUSTMENT NUT 5 16 OLD 1 2 NEW MP45 271M MP85 6148 01JUN10 GREAD INSTRUCTION SHEET JUMPER PLACEMENT FOR INSTRUCTIONS THOROUGHLY 325 AND 625 AFTER MARKET INSTALLATIONS OR IBEFOHE proceepine ELECTRONIC SENSING UNIT REPLACEMENT Q 525 IMPORTANT 325 AND 625 ELECTRONIC SENSING UNITS USED AFTER MARKET INSTALLATIONS OR REPLACEMENT SITUATIONS ARE PROGRAMMABLE DURING INSTALLATION OF A SYSTEM OR REPLACEMENT OF AN ELECTRONIC SENSING UNIT DO NOT ASSUME THAT THE SENSING UNIT JUMPERS ARE PRE SET THE MOUNTED ORIENTATION OF THE CONTROL BOX ASSEMBLY AND THE SUSPENSION TYPE MUST BE ESTABLISHED IN ORDER TO SET THE JUMPERS AS NEEDED TO PROGRAM THE SENSING UNIT TO THE COACH JP1 AND JP2 CONTROL BOX ORIENTATION Page 1 of 2 MOVE JUMPERS JP1 AND JP2 ACCORDING TO THE ORIENTATION OF THE CONTROL BOX USE THE DRAWINGS PROVIDED TO DETERMINE WHICH APPLICATION IS FOR THE ORIENTATION OF YOUR CONTROL BOX FOR SHIPPING PURPOSES THE 4 JUMPERS ARE SLID ONTO ONE SIDE OF JP1 THROUGH JP4 MOVE ONLY THE JUMPERS NEEDED TO DETERMINE ORIENTATION AND SUSPENSION LEAVING THE REMAINING JUMPERS AS
21. NGS PROVIDED TO DETERMINE WHICH APPLICATION IS FOR THE ORIENTATION OF YOUR CONTROL BOX FOR SHIPPING PURPOSES THE 4 JUMPERS ARE SLID ONTO ONE SIDE OF JP1 THROUGH JP4 MOVE ONLY THE JUMPERS NEEDED TO DETERMINE ORIENTATION AND SUSPENSION LEAVING THE REMAINING JUMPERS AS THEY ARE SHIPPED WILL NOT CAUSE PROBLEMS JP4 JP3 JP2 JP1 SHIPPED MOVED POSITION POSITION THE FOLLOWING DRAWINGS SHOW THE SENSING UNIT INSIDE THE CONTROL BOX AS VIEWED WHEN LOOKING DOWN FROM THE TOP OF THE CONTROL BOX REMOVE THE RUBBER RING AND PLASTIC COVER ONLY IF NEEDED THE RING AND COVER MUST BE REINSTALLED FRONT OF VEHICLE FRONT OF VEHICLE T 4321 o X E JUMPERS M MOVE JP1 ONLY L D PLEXIGLASS PLEXIGLASS L o V 7 JUMPERS 1 a LEAVE JP1 1234 AND JP2 AS SHIPPED AE Z FRONT OF VEHICLE FRONT OF VEHICLE PLEXIGLASS dh amp g 4 3 MM E 4 41 pL B EE b 5 JUMPERS PLEXIGLASS JUMPERS MOVE JP2 ONLY MOVE JP1 AND JP2 MP85 451C 29JUN04 READ pINSIHUCHONS ELECTRICAL CONNECTION DIAGRAM A BEFORE ELECTRONIC SENS
22. NTROL 2 BLACK 3400 SWITCHED GROUND FROM TOUCH PANEL RIGHT REAR CONTROL 3 BLACK 9301 SWITCHED GROUND FROM TOUCH PANEL FOR TRAVEL 4 WHITE 6230 GROUND FOR TOUCH PANEL 5 BLACK 8110 SWITCHED GROUND FROM TOUCH PANEL FOR PRESS SW OVERIDE 6 BLACK 9300 SWITCHED GROUND FROM TOUCH PANEL FOR DUMP 7 BLACK 9000 SWITCHED GROUND FROM PARK BRAKE SWITCH 8 NO CONNECTION 9 BLACK 2400 SWITCHED GROUND FROM TOUCH PANEL RIGHT FRONT CONTROL 10 BLACK 4400 SWITCHED GROUND FROM TOUCH PANEL LEFT REAR CONTROL 11 BLACK 8600 SWITCHED GROUND FROM TOUCH PANEL PUMP RELAY CONTROL 12 BLACK 6121 412V ACC POWER FROM TOUCH PANEL CN2 12 PIN BROWN CONNECTOR 1 NO CONNECTION 2 WHITE 6243 GROUND FOR LEFT FRONT SOLENOID VALVE 3 WHITE 6242 GROUND FOR RIGHT FRONT SOLENOID VALVE 4 WHITE 6241 GROUND FOR RIGHT REAR SOLENOID VALVE 5 WHITE 6240 GROUND FOR LEFT REAR SOLENOID VALVE 6 BLACK 8100 SWITCHED GROUND FROM MANIFOLD PRESSURE SWITCH 7 BLACK 9000 GROUND FROM PARK BRAKE SWITCH TO PUMP RELAY 8 BLACK 4400 SWITCHED 412 FOR LEFT REAR SOLENOID VALVE 9 BLACK 2400 SWITCHED 412 FOR RIGHT FRONT SOLENOID VALVE 10 BLACK 1400 SWITCHED 412 FOR LEFT FRONT SOLENOID VALVE 11 BLACK 3400 SWITCHED 412 FOR RIGHT REAR SOLENOID VALVE 12 BL
23. ONNECTION INFORMATION 6235 3000 8 E N LR RR T LR 4000 6235 ET RR E MP85 047C 020 03 ELECTRICAL CONNECTION DIAGRAM 305 AND 325 SERIES LEVELING SYSTEM TOUCH PANEL 6 LR WARN SWITCH BLACK 4000 5 RR WARN SWITCH BLACK 3000 4 RF WARN SWITCH BLACK 2000 3 LF WARN SWITCH BLACK 1000 O 2 NOT USED KEY PIN 1 GROUND WHITE 6230 a em 1 ACCESSORY RED 6120 O O HWH HYDRAULIC LEVELING Vit Q 1 l J S FE CAUTION UNDERSTAND OPERATOR S MANUAL BEFORE USING BLOCK FRAME AND TIRES O SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE O SENSING UNIT NOT r USED WITH 305 SYSTEMS gt 7 NOT USED 6 KEY PIN 5 LS BLACK 0100 L 4 FRONT BLACK 0200 3 RS BLACK 0300 CN1 2 REAR BLACK 0400 1 12V ACC BLACK 6122 FUSE CN3 2 NOT USED KEY PIN 3 NOT USED 4 WARN LIGHT BUZZER CONTROL BLACK 7699 5 NOT USED 11 PSW DISSABLE BLACK 8110 10 PUMP RELAY BLACK 8600 9 RIGHT FRONT BLACK 2400 8 RIGHT REAR BLACK 3400 7 LEFT REAR BLACK 4400 6 LEFT FRONT BLACK 1400 5 DUMP BLACK 9300 4 TRAVEL BL
24. OTES AND CHECKS in the first section TROUBLE SHOOTING GUIDE In many cases this will save time and mistakes when trouble shooting a system This Repair Manual is offered as a guide only It is impossible to anticipate every problem or combination of problems For any problems encountered that are not addressed in this manual contact HWH Corporation for assistance 800 321 3494 PROCEED WITH TROUBLE SHOOTING GUIDE MI91 115C 270CT03 TROUBLE SHOOTING WARNING BLOCK FRAME AND TIRES SECURELY BEFORE CRAWLING UNDER VEHICLE DO NOT USE THE LEVELING JACKS OR AIR SUSPENSION TO SUPPORT VEHICLE WHILE UNDER VEHICLE OR CHANGING TIRES VEHICLE MAY DROP AND OR MOVE FORWARD OR BACKWARD WITHOUT WARNING CAUSING INJURY OR DEATH WHEN ROUTING OR REROUTING HYDRAULIC HOSES AND WIRES BE SURE THEY ARE NOT EXPOSED TO ENGINE EXHAUST OR ANY HIGH TEMPERATURE COMPONENTS OF THE VEHICLE NEVER PLACE HAND OR OTHER PARTS OF THE BODY NEAR HYDRAULIC LEAKS OIL MAY CUT AND PENETRATE THE SKIN CAUSING INJURY OR DEATH SAFETY CLASSES ARE TO BE WORN TO PROTECT EYES FROM DIRT METAL CHIPS OIL LEAKS ECT FOLLOW ALL OTHER SHOP SAFETY PRACTICES NOTES AND CHECKS Read and check before proceeding with Trouble Shooting Steps NOTE HWH CORPORATION ASSUMES NO LIABILITY FOR DAMAGES OR INJURIES RESULTING FROM THE INSTALLATION OR REPAIR OF THIS PRODUCT 1 If the jacks cannot be retracted see TROUBLE SHOOTING Step 4h for temporary measures Make sure the ma
25. TE If opposing LED s are lit there is a problem with the Sensing Unit If LED A is lit Turn the adjustment screw COUNTER CLOCKWISE until the LED is off If LED C is lit Turn the adjustment screw CLOCKWISE until the LED is off If LED B is lit Turn the adjustment nut COUNTER CLOCKWISE until the LED is off If LED D is lit Turn the adjustment nut CLOCKWISE until the LED is off IMPORTANT When all 4 LED s are off move the vehicle to an unlevel position so one or two yellow lights are on Level the vehicle according to the yellow LEVEL lights Recheck the level If more adjustment is needed DO NOT try to adjust the sensing unit until the yellow level lights go out instead just tweak the sensing unit ignoring the LED s on the sensing unit Example After the initial adjustment and releveling the vehicle the front is still low This means the front yellow level light is turning off too soon Determine which sensing unit light is the front light A B C or D Move the adjustment for that light very very slightly in the OPPOSITE direction that is given in the above instructions for LED s A B C and D This will allow the front yellow light to stay on slightly longer to bring the front up more Again unlevel the vehicle then relevel the vehicle using the yellow level lights on the touch panel Recheck with a level Repeat the PIE tweaking process until the system levels the vehicle y
26. Unit Test The sensing unit is located in the control box There are four yellow LED s on the sensing unit These LED s will match the yellow Level Sensing lights on the touch panel With the vehicle level all of the lights on the sensing unit and the touch panel should be out If one or two lights are on adjust the sensing unit according to the SENSING UNIT ADJUSTMENT page in the diagram section It is important to note that very small movements of the adjusting nut or screw should be all that is needed to change the yellow LED s on the sensing unit Use the jacks to raise one side or end of the vehicle at a time to make sure each yellow Level light will come on and go back out The sensing unit LED s can be checked with just the ignition on The Level Sensing lights on the touch panel can only be checked if the LEVEL MODE light is on PROBLEM SOLUTION DIAGRAM 7a The Sensing Check the sensing unit adjustment bracket for cracks breaks REFER TO Unit cannot be or deformities Make sure the adjustment screw is not stripped 85 6148 adjusted to turn out If the components of the adjustment bracket are OK Sensing Unit Adjustment off the yellow replace the sensing unit LED s MP85 451C MP85 451D 7b The lights on Due to the fact that the control box power unit assembly may Jumper Placement the touch panel be mounted in any one of four directions the sensing unit may not match the lights be programmed to match the mounting direc
27. able egs B EI 47 5 Left Front LED s 5 and 6 Right Front LED s 3 and 4 Right Rear LED s 7 and 8 up HS Left Rear LED s 1 and 2 ii If the YELLOW and RED LED s come on while pushing the B DOWN arrows the touch panel and touch cable are OK V TTE om If the LED s come on refer to problem 4b and check the pump REFER TO MP85 212C pressure and voltage If the pump pressure and voltage is OK open any valve release T Handle or nut Push the appropriate 8100 pan caper 50 PSI PRESSURE lt Ips SWITCH m UP arrow for that jack If the jack does not extend the problem is the shuttle valve If the jack extends unplug the 50 PSI manifold pressure switch and close the valve releases on the solenoid valves Ground the 8100 wire and try any UP arrow If the jacks extend replace the pressure switch If the EE jacks do not extend the problem is the 8100 wire it s mn connections or the control box Check for continuity between HE 3 EE the two pins for the 8100 wire If the wire and connections are _ M MANIFOLS OK replace the control box E If after replacing the control box the jacks will still not extend refer to part 4d and check individual pairs of jacks REFER TO 85 2195 MI91 2108 28JUL04 TROUBLE SHOOTING PROBLEM 4d One or more jac
28. ction problem between the control box and manifold Check the yellow and red LED s for the solenoid valve while pushing DOWN ARROWS It is assumed jacks will extend when UP ARROWS are pushed If the YELLOW LED is lit but not the RED LED check the fuse for that valve If the fuse is blown the solenoid valve or harness is shorted to ground If the fuse is not blown replace the control box If neither LED is lit replace the touch panel DIAGRAM indino REFER MP85 212C BREATHER CAP VALVE RELEASE NUTS PRESSURE OUTLET CHECK LR VALVES 4 irae a 975 6 MANIFOLDS ARE EQUIPPED WITH VELOCITY VALVES VALVE RELEASE HANDLES SHUTTLE VALVE 50 PSI PRESSURE SWITCH PUMP MANIFOLD ASSEMBLY REFER TO MP65 270C MI91 2138 18 05 TROUBLE SHOOTING PROBLEM 4h No jacks will retract when DOWN arrows are pushed It is assumed jacks will extend when UP ARROWS are pushed 4i One or more jacks retract slowly or start to retract but will not retract completely 4j A red Warning light on the Touch Panel will not go out The jacks are fully retracted 4k The Master Warning light and or buzzer will not go out All Warning lights on the Touch Panel are off SOLUTION Check the YELLOW and RED LED s for the solenoid valves whi
29. e RED LED check the fuse for that valve If the fuse is OK replace the box If the fuse is blown the problem is a short in the harness or a bad solenoid valve If neither the YELLOW LED or the RED LED is lit check for a ground on the correct pin in the CN1 GRAY 12 pin connector at the control box If a ground is present replace the control box If a ground is not present check for a ground on the correct pin in the CN3 11 pin connector at the touch panel If a ground is present the problem is the harness or harness connections If a ground is not present replace the touch panel DIAGRAM 1431 indino Loa 4 ee Us Oo FUSE LED REFER TO MP85 212C BROW N CN2 M PIN1 12 FUSE _ ses Acc 1 M 3 529999999 EFER TO MP85 192C MI91 2118 29JUN04 TROUBLE SHOOTING PROBLEM 4e The red WARNING light on the Touch Panel will not come on as it s jack starts to extend The ignition must be on while testing warning switches 4f The Master Warning light and or buzzer will not come on when a Touch Panel warning light is on The ignition must be on SOLUTION Unplug the warning switch at the jack Short the two pins in the harness plug together If the warning light comes on re
30. h panel warning lights or master warning light and buzzer at this time refer to problems 4j and 4k MI91 2158 24AUG10 TROUBLE SHOOTING Part 6 This part is for vehicles with an air suspension The air must be dumped from the vehicle air suspension before leveling the vehicle This is done with a HWH air dump system or a pilot air dump system supplied by the chassis manufacturer HWH air dump system consists of a minimum of one normally closed 12 volt actuated solenoid valve at the front and one valve at the rear of the vehicle Some vehicles have one air dump valve for each height control valve There are 2 wires to each valve The white wire is constant ground The black 9300 wire is switched 12 volts to open the valve The 9300 wire will be hot whenever the LEVEL MODE LIGHT is on The valve should open and the air should exhaust from the vehicle suspension and air tanks When the LEVEL MODE light is off the air dump valves should be closed Air should not leak through the valves The chassis supplied pilot dump system has two positions One position is the TRAVEL mode which allows the height control valves to work The other position is the DUMP mode which will exhaust the air from the suspension air bags only There are three wires in a four pin UML plug from HWH to operate the pilot valve The 9300 wire is switched 12 when the LEVEL MODE light is on to put the system in the DUMP mode The 9301 wire is switched 12 when
31. he connections wire 9000 or the park brake circuit mE Note Make sure all connections the relay are clean and tight NY Corrosion that may not be visible can cause problems at the relay REFER 85 192 Remember the ARROW must pushed when testing the relay MI91 2098 29JUN04 TROUBLE SHOOTING PROBLEM SOLUTION DIAGRAM PRESSURE 4b The jack s will If the pump is running under no load the problem is the pump AN not extend or will or the shuttle valve Connect a 5000 PSI pressure gauge to VALVES 4 AR extend but will not the pressure outlet fitting on the manifold Run the pump The wore A KA Q MANIFOLDS lift the vehicle The pump pressure should be 3500 PSI Check the voltage at the TES rd pump runs under pump while the pump is running If the voltage is under Bg v no load 10 volts the pump pressure may be low The minimal allowable Hi lm pressure would be 3300 PSI The maximum allowable pressure would 3800 PSI pumps an adjustable relief valve If proper pressure cannot be achieved replace the pump REFER 65 270 4c No jacks will The problem is most likely the 50 psi manifold pressure switch extend the pump but could be the shuttle valve control box touch panel or runs under load touch panel c
32. he white ground wire and the 9301 wire inthe fo HWH 4 pin UML plug If power is not present the problem is REFER TO MP85 212C either the white ground wire the 9301 wire or their connections mE If power is present the problem is with the chassis equipment or harness Contact the vehicle manufacturer for assistance If the YELLOW 13 LED is lit but not the RED 14 LED check the F7 fuse for TRAVEL If the fuse is OK replace the control box If the fuse is blown the 9301 wire is shorted to ground or there is a short in the vehicle pilot dump equipment Unplug the HWH 4 pin UML plug Replace the fuse and retry If the fuse blows again the 9301 wire is the problem If the fuse does not blow the vehicle equipment is the problem If neither LED is lit check for a ground on PIN 4 at the REFER TO MP85 2215 touch panel If there is no ground replace the touch panel If there is a ground on PIN 4 check for a ground on PIN 3 in EA PS the 12 pin GRAY connector CN1 at the control box If there is no ground the problem is the 9301 wire or it s connections m at the touch panel or control box If there is a ground on PIN 3 eof EE replace the control box one te ees vehicle will not return to ride height 9310 DUMP E D 6231 GRND gt REFER TO MP85 207C MI91 2178 28JUL04 TROUBLE SHOOTING Part 7 Sensing
33. ition must be in the ON or ACC position for the STORE button to function Push the STORE button The STORE light will come on steady All four jacks will start to retract If the vehicle is equipped with an air suspension the suspension should start to return to ride height at this time As each jack is completely retracted within 1 4 to 1 2 inch it s red warning light on the touch panel will go out and it s solenoid valve will turn off When all of the red warning lights are out the master warning light and buzzer will be off The STORE light will remain on until the OFF button is pushed or the ignition key is turned NOTE The park brake does not have to be on to use the STORE button The STORE light should be on whenever the vehicle is traveling PROBLEM SOLUTION DIAGRAM 5a The STORE light Push the LEVEL MODE button If the LEVEL MODE light will not come on comes on push the OFF button Make sure the LEVEL MODE when the STORE light is OFF Retry the STORE button If the STORE light button is pushed does not come ON replace the touch panel light is on If the LEVEL MODE light does not come ON when pushing the LEVEL MODE button refer to problem 3a 5b The STORE light Check voltage between PIN 1 CN1 and PIN 3 CN3 at the Pd will not stay on touch panel If there is 11 volts while pushing the STORE BEES button and the STORE light does not come ON replace the touch pane
34. k N FUSE LED 3 n N 10 gt lt lt m HHR N PIN1 A CX CN4 LED RELAY DESCRIPTION FUSE NOTE FOR DETAILED INPUT OUTPUT INFORMATION ABOUT PIN CONNECTIONS SEE 1 YELLOW LEFT REAR F1 15 AMP ELECTRICAL CONNECTION DIAGRAM CONTROL 2 RED LEFT REAR BOX CONNECTION INFORMATION 3 YELLOW RIGHT FRONT F2 15 AMP 4 RED RIGHT FRONT NOTE A LIT YELLOW LED INDICATES THERE 5 YELLOW LEFT FRONT F3 15 AMP IS A GROUND SIGNAL TO TURN THE 6 RED LEFT FRONT CORRESPONDING RELAY ON 7 YELLOW RIGHT REAR F4 15 AMP 8 RED RIGHT REAR A LIT RED LED INDICATES THERE IS 9 YELLOW F5 5 AMP VOLTAGE ON IT S CORRESPONDING OUTPUT PIN 10 RED PUMP 11 YELLOW DUMP F6 5 AMP IF A YELLOW LED IS LIT AND THE 12 RED DUMP CORRESPONDING RED LED IS OFF EITHER 13 YELLOW TRAVEL F7 5 AMP IT S FUSE IS BLOWN OR THE RELAY IS BAD 14 RED TRAVEL PARK BRAKE F12 3 AMP IF THE YELLOW LED S ARE WORKING BUT NO RED LED IS COMING ON THERE MAY BE NOTE DUMP AND TRAVEL FUNCTIONS MAY NOT BE PRESENT CN4 SENSING UNIT CONNECTIONS PIN1 RED 12 ACC FOR SENSING UNIT PIN2 RED GROUND FOR REAR YELLOW LEVEL LIGHT PIN3 GREEN GROUND FOR RIGHT SIDE YELLOW LEVEL LIGHT PIN4 BLACK GROUND FOR FRONT YELLOW LEVEL LIGHT PIN5 YELLOW GROUND FOR LEFT SIDE YELLOW LEVEL LIGHT PIN6 WHITE GROUND FOR SENSING UNIT PROBLEM WITH INPUT VOLTAGE IN THE 4 PIN CONNECTOR IF A YELLOW LED IS NOT LIT THERE IS A PROBLE
35. ks or the correct jacks will not extend when an UP arrow is pushed Other jacks extend OK NOTE Remember when refering to 4d from 4c the manifold pressure switch and shuttle valve have been checked and are OK SOLUTION Check the YELLOW and RED LED s for the jack s that won t extend while the UP ARROW is being pushed Left Rear LEDs 1 and 2 Right Front LEDs 3 and 4 Left Front LEDs 5 and 6 Right Rear LEDs 7 and 8 If the YELLOW and RED LED s are both lit or the YELLOW LED s are lit but not the RED LED s the problem is between the control box and the hydraulic manifold If the YELLOW and RED LED s are not lit the problem is between the control box and the touch panel Note Remember when checking for voltage or ground all harnesses must be plugged in and the correct UP ARROW must be pushed The signal between the touch panel and the control box to run the pump and solenoid valves is a ground signal The signal between the control box and the pump relay or jack solenoid valves is a 12 volt signal If the YELLOW and RED LED s are lit check the correct pins in the BROWN CN connector for 12 and ground If 12 or ground is not present replace the control box If 12 and ground is present check for 12 and ground at the solenoid valve If 12 or ground is not present the harness is the problem If 12 and ground is present at the solenoid valve replace the solenoid valve If the YELLOW LED is lit but not th
36. l If the voltage is bellow 11 volts there may be a ground wire connection or voltage problem 99994999959 5c The STORE light If a red jack down warning light is not it s jack will not is on the jacks will retract Refer to part 4e to diagnose warning light issues not retract It is assumed at this point the jacks will retract properly using the DOWN arrows on the touch panel If some jacks will retract but one or more jacks will not retract recheck problems 49 and 4h If the jacks retract properly replace the touch panel 5d The STORE light Recheck problems 4j and 4k to make sure the jacks retract is on NO jacks will properly in the manual mode With the STORE light on check REFER TO 85 206 retract pins 4 6 7 8 and 9 of CN3 at the touch panel for ground If ground is not present on pins 4 6 7 8 or 9 replace the touch panel If ground is present on these pins check pin 3 CN1 at the control box for ground If ground is not present the problem is the cable or the connections to the touch panel or control box If ground is present replace the control box 5e The vehicle will Proceed to Part 6 not return to ride height 5f The Warning lights on the Touch Panel or the Master Warning light and buzzer will not turn off Again it is assumed these items have been checked and are functioning properly If there is a problem with the touc
37. le pushing DOWN arrows If the LED s are coming on manually open the solenoid valves If the jacks do not retract the problem is most likely the shuttle valve Loosen a hydraulic hose for a jack The jack should start to retract If the jack does not retract the problem is the jack If the jack starts to retract replace the shuttle valve If the YELLOW and RED LED s are not coming on while pushing the DOWN arrows check for a ground on PIN 11 of CN3 at the touch panel and PIN 5 of the 12 pin GRAY connector CN 1 at the control box while pushing DOWN arrows If a ground is not present at the touch panel on PIN 11 replace the touch panel If there is a ground at the touch panel but not at the box on PIN 5 there is a connection or harness problem If there is a ground at the control box on PIN 5 replace the control box If a jack will not retract completely the problem is most likely the jack If a jack retracts slowly more than three minutes above 55 degrees outside temperature or more than five minutes at freezing loosen the hose for that jack If that does not increase the retract speed replace the jack If the jack retracts at a normal speed with the hose loose the problem would be the velocity valve or solenoid valve Unplug the warning switch at the jack If the warning light goes out replace the warning switch If replacing the switch does not fix the problem the cylinder may need to be replaced Contact HWH Technical Service for
38. listed in this guide If this occurs contact HWH Corporation Customer Service for assistance Part 1 Make sure the transmission is in the recommended position for parking and the park brake is set With the ignition off there should be no power to the leveling system There should be no Touch Panel lights on The pump should not be running PROBLEM SOLUTION DIAGRAM 1a The Touch Panel Wire number 6122 on PIN 1 of CN1 on the touch panel has a light on or can should be connected to a 12 source on the accessory side be turned on with of the ignition switch There should be no power on this wire the ignition off ith the igniti ff 9 win enn REFER 85 192 1b pump runs Unplug CN2 from the control box If the pump continues to continuously run the pump relay is stuck and needs to be replaced If the pump stops running unplug CN1 from the control box and ge 7 plug CN2 back in If the pump starts running the control box REFER TO MP 85 206C REFER MP85 192C is bad If the pump does not run unplug CN3 from the touch panel and plug CN1 back in If the pump runs wire 8600 in the harness is shorted to ground If the pump does not run the touch panel is the problem Part 2 Turn the ignition switch to the position The touch panel should remain off PROBLEM SOLUTION DIAGRAM 2a The Level Mode Push the OFF button If panel lights stay on light and or other replace the touch panel
39. n switch is in the ON position MI91 1175 28JUL04 TROUBLE SHOOTING The 325 series leveling system is a manually operated If the vehicle is equipped with a pilot air dump system system Push and hold the Up Arrow EXTEND buttons the diagnostics for HWH is limited to a 12 Travel or Dump and Down Arrow RETRACT buttons to operate the jacks signal from the HWH Touch Panel and Control Box Refer to the chassis manufacturer for the correct procedures when The jacks will always extend in pairs both front both rear working on the chassis pilot dump equipment right front and right rear or left front and left rear When testing the system always operate all 4 sets of buttons In the following repair guide each Part describes an This assures the correct pair of jacks will extend or retract operation or function of the leveling system Below each when their button is pushed Part there are three columns The left hand column describes a possible symptom The center column gives a Vehicles with an active air suspension will have an air dump diagnostic procedure and solution The right hand column system This will be an HWH system with several normally shows a diagram or refers to a diagram in the diagram section closed dump valves or a factory installed pilot air dump System which is part of the chassis equipment This manual It is important to remember it is possible to encounter a will discuss diagnostics of each problem not
40. ng systems should contact HWH technical service 800 321 3494 before beginning Special attention should be given to all cautions wiring and hydraulic diagrams Special note When installing a new control box make sure the box is properly grounded before applying power to the system Tightening of hose ends If tightening a new hose end make the hose end snug finger tight on the fitting then tighten the hose end 1 3 turn 2 FLATS If tightening an existing hose end tighten the hose end to snug plus 1 4 turn 1 FLAT Suggested tools for trouble shooting the HWH leveling systems JUMPER WIRES UP TO 10 GAUGE PRESSURE GAUGE 3500 PSI MIN MULTI METER 12 VOLT TEST LIGHT PROCEED WITH THE TROUBLE SHOOTING STEPS ON THE FOLLOWING PAGE MI91 1169 25APR11 CONTROL IDENTIFICATION LEVEL MODE LIGHT LEVEL BUTTON STORE LIGHT STORE BUTTON LEFT SIDE EXTEND BUTTON OFF BUTTON LEFT SIDE RETRACT BUTTON gt UNDERSTAND OPERATOR S MANUAL BEFORE USING BLOCK FRAME AND TIRES SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE Q FRONT RETRACT BUTTON FRONT EXTEND BUTTON WARNING LIGHTS 4 Red RIGHT SIDE EXTEND BUTTON RIGHT SIDE RETRACT BUTTON LEVEL LIGHTS 4 Yellow REAR EXTEND BUTTON REAR RETRACT BUTTON CONTROL FUNCTIONS CONTROL BUTTONS LEVEL BUTTON This button places the system in leveling mode OFF BUTTON This button turns off contr
41. nnectors The black wires must be in the B pins of the connectors Replace the touch panel See Part 6 of the TROUBLE SHOOTING STEPS DIAGRAM FUSE o E aco 85 192 CN3 59009999919 Fa EN REFER TO MP85 192 MI91 2078 15 08 TROUBLE SHOOTING The jacks operate in pairs front side and rear UP ARROWS EXTEND and DOWN ARROWS RETRACT the jacks Part 4 Push and hold the front UP ARROW both front jacks should extend At approx 1 4 to 1 2 extension each red Warning light should come on One jack may reach the ground and even lift the vehicle slightly before the other With both jacks extended to the ground and lifting the vehicle release the UP ARROW both jacks should remain extended Push and hold the front DOWN ARROW both front jacks should retract Within 1 4 to 1 2 of complete retraction each red Warning light should go out Repeat the process with each set of UP and DOWN ARROWS making sure the correct pair of jacks extend and retract properly Three or four jacks should never extend at the same time PROBLEM SOLUTION DIAGRAM 4a The Panel is on While the UP ARROW is pushed there should be 12 volts on PUMP RELAY the pump does
42. nual retract valves are closed before trouble shooting 2 The Trouble Shooting Guide must be followed in order Problems checked for in one step are assumed correct and may not be checked again in following steps 3 Check that the oil reservoir is full with the jacks in the fully retracted position If the vehicle is equipped with HWH room extensions refer to the HWH Owners Manual for proper position of the room when checking the oil level 4 Most coaches have more than one battery one for the engine and the other s for the coach The engine battery supplies power for the control box and hydraulic pump Batteries under no load should read 12 6 volts Batteries must maintain good voltage under load Batteries must be in good condition with no weak cells An alternator converter or battery charger will not supply enough power for the system to operate properly 5 Proper grounding of all components is critical See the electrical circuit for specific grounds required Faulty grounds especially for the control box solenoid manifold or the pump assembly may cause control box component damage and or improper or erratic operation 6 Do not replace the control box unless the Repair Steps say to replace it Otherwise the malfunctions may damage the new control box This manual is intended for use by experienced mechanics with knowledge of hydraulic and automotive electrical systems People with little or no experience with HWH leveli
43. ol power to the leveling system STORE BUTTON This button will retract all four jacks The panel must be off before pressing the STORE button EXTEND BUTTONS UP ARROWS These buttons will extend their respective jack pairs to lift the vehicle RETRACT BUTTONS DOWN ARROWS These buttons will retract their respective jack pairs to lower the vehicle FRONT Right Front and Left Front jacks RIGHT SIDE Right Front and Right Rear jacks LEFT SIDE Left Front and Left Rear jacks REAR Left Rear and Right Rear jacks INDICATOR LIGHTS LEVEL MODE LIGHT This light indicates the system is in the leveling mode STORE LIGHT This light will be on when the system is in the store mode LEVELING LIGHTS If a yellow LEVELING light is on that indicates a side corner or end of the vehicle is low Extend the appropriate jack pairs to put out the yellow light One or two yellow LEVELING lights can be on at a time The vehicle is level when all yellow lights are out WARNING LIGHTS A red WARNING light will be on when ever the corresponding jack is extended approximately 1 2 inch provided the ignition is in the ACC or ON position Some vehicles are equipped with a dash mounted master JACKS DOWN light which will be on when one or more jacks are extended approximately 1 2 inch and the ignition is in the ON position WARNING BUZZER A buzzer will sound if a jack is extended approximately 1 2 inch or more and the ignitio
44. or use the leveling system to manually level the vehicle It is recommended to use the vehicle trim line to determine level An alternative would be to use a small bubble level If using a bubble level the level should be placed on a flat surface close to the mounting location of the control box sensing unit With the vehicle level if there are no yellow light lit on the Touch Panel the sensing unit is properly adjusted If there are yellow LEVEL lights lit on the Touch Panel manual adjustments to the Sensing Unit are needed A Phillips Screw driver or sockets w driver or box end wrenches of 7 8 3 4 1 2 5 16 or 1 4 sizes will be needed The Sensing Unit is mounted inside the Control Box The Control Box is mounted to the power unit valve assembly There are four LED s on the Sensing Unit A B C and D Refer to the drawing below The Sensing Unit is adjusted by turning the adjustment nut to turn out LED s B and D The adjustment screw will turn out LED s A and C If the adjustment nut has to be turned more than 1 2 flat or the adjustment screw has to be turned more than 3 4 turn to turn the LED out there may be a problem with the Sensing Unit or the mounting of the Control Box If two LED s are on it is best to make the B D adjustments first then hold the adjustment nut from moving while making the A C adjustment TOP VIEW SENSING UNIT NO
45. place the warning switch Retract the jacks before removing the warning switch If the warning light does not come on ground the pin for the black wire in the harness If the warning light comes on the problem is the white ground wire or it s connections If the light does not come on ground the correct pin in the CN2 connector at the touch panel If the warning light comes on there is a connection or harness problem If the warning light does not come on replace the touch panel Check for 12 power at the warning light and buzzer If 12 is not present trace the wire to it s source If the fuse is blown the 12 supply wire is shorted to ground If 12 is present at the warning light and buzzer check for a ground on PIN 4 CN1 of the touch panel If ground is not present replace the touch panel If ground is present check for a ground at the warning light and buzzer If a ground is present the problem is the light or buzzer If a ground is not present the problem is a connection or the 7699 wire 5 15 AMP FUSE J DOWN pu LIGHT DIAGRAM U REFER TO MP85 047C 000 EEA 235 J 3AMP FUSE Essa acc CONNECT THIS END TO 7 12 VOLT IGNITION ON POWER PIGTAIL W DIODE AND IN LINE FUSE HOLDER 6121 JACK BUZZER
46. s at least 100 psi of air in the vehicle air tanks PO are equipped with The ignition must be on Make sure the touch panel LEVEL V HWH air dump MODE light is OFF If air is not exhausting from the dump valves System the problem is in the vehicle suspension most likely a height DUMP control valve If air is exhausting from the dump valve s unplug ums m 6b The vehicle will the dump valve s If the air continues to exhaust from the TP oma not return to ride valve s replace the valve s qu height If the air stops exhausting from the dump valve s when they are AR DUMP unplugged check for a ground on PIN 5 of CN3 at the touch 9900 panel with the CN3 connector unplugged If a ground is present rat replace the touch panel If a ground is not present unplug the Em GRAY 12 pin connector CN1 at the control box Check PIN 6 REFER TO MP85 2195 in the harness plug for a ground If a ground is present the 9300 gt wire in the touch panel harness is shorted to ground If there is no ground on PIN 6 replace the control box E MEL P REFER 85 192 For vehicles Make sure there is at least 100 psi of air in the vehicle air tanks 00009 with ignition must sure the STORE light is 8 pilot air dump Check the YELLOW 13 LED and the RED 14 LED for travel z ET system Both LED s should be lit If both LED s are lit check for 12 WL volts between t
47. the STORE light is on to put the system in the TRAVEL mode The white wire is constant ground The ignition must be on to have power on the 9301 wire The 9301 wire will be hot any time the ignition is on if the park brake is off HWH is only responsible for the three wires from the control box to the four pin UML plug All other harnesses and equipment are supplied by the chassis or vehicle manufacturer PROBLEM SOLUTION DIAGRAM 6a Air will not CAUTION wHEN TESTING THE AIR DUMP SYSTEM dump from the MAKE SURE THE VEHICLE IS SUPPORTED PROPERLY suspension when BEFORE GOING UNDER THE VEHICLE THE VEHICLE the LEVEL MODE WILL DROP SUDDENLY WHEN THE AIR IS EXHAUSTED light is on FROM THE AIR BAGS NOTE The HWH Check the YELLOW 11 LED and the RED 12 LED in the and the pilot dump control box If neither LED is lit check for a ground on PIN 5 System will be the CN3 connector at the touch panel and PIN 6 12 pin GRAY same basic tests CN1 connector at the control box If there is no ground at the for dumping air panel replace the touch panel If there is a ground at the panel but not the control box the problem is a connection or the 9300 wire in the harness If there is a ground on PIN 6 at the control box replace the control box r3 If the YELLOW 11 LED is lit but not the RED 12 LED check the fuse If the fuse is blown there is a short to ground
48. tion Aftermarket on the sensing and replacement control boxes and sensing units are equipped unit with programming jumpers If the unit is equipped with these jumpers check the programming instructions in the diagram section to make sure the jumpers are in the correct position If the jumpers are correct or the sensing unit is not equipped with the jumpers check and CN4 of the control box and of the touch panel to make sure that the wires in the proper positions If the sensing unit is not equipped with the programming jumpers get the AP part number off the control box and contact HWH to make sure the proper control box is being used REFER TO MP85 451C If the wiring the jumper placement and the control box is OK replace the sensing unit 7c Level Sensing Refer to problem 3c lights cannot be made to come on or go out __ FUSE Acc 1 p ON 85 192 MI91 2188 31JUL07 SENSING UNIT MAINTENANCE SERVICE SENSING UNIT ACCURACY TOLERANCE The sensing unit has an accuracy tolerance of 5 4 inches front to rear and 1 inch side to side on a 36 foot vehicle Typical leveling results will be better SENSING UNIT ADJUSTMENT To adjust the sensing unit first the vehicle must be level Either position the vehicle on a level surface
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