User Manual of Wells Engine Unit
Contents
1. LUBRICATE 7 51 Disconnect the power cord Slip the plug retainer from the 6 prong connector and disconnect the Foot Control NI 7 5 2 Remove the four rubber feet and lift off the base cover 7 5 3 Apply a small amount of grease to the wiper arm contacts Use Wells lubricant part number 112 LUBRICANT or a high temperature automotive grease with molybdenum disulfide 7 5 4 Replace the base cover and four rubber feet 7 5 5 Apply a small amount of grease to the forward reverse locating pin under the pedal 7 56 Connect the 6 prong cord socket and slip the plug retainer over the connector PULLEY GUARD Figure 9 Foot Control 7 6 MOTOR BRUSH MAINTENANCE Inspect the brushes periodically to detect worn out brushes which can cause jerky erratic motor operation and damage to the commutator Brush life depends on the amount of use as well as the age of the motor and other factors Brushes last about 4 to 9 months with continuous use 7 6 1 Tools needed 1 4 straight blade screwdriver 3 16 straight blade screwdriver and the 3 32 hex wrench 7 6 2 Disconnect the power cord 7 6 3 Remove the belt and arm assembly from the hood 7 6 4 Remove the pulley guard 7 6 5 Remove the motor pulley after loosening the set screw with the 3 32 hex wrench 7 6 6 the hood amp motor upside down and remove the four rubber feet Do not remove the four pan head screws in the2. SHORT STUD 2 AS530 FELT WASHER 3 3 AS536 SCREW 10 52 X 5 8 BHSS Y 4 AS203 SPRING CAP J 5 AS537 SCREW 2 56 X 1 16 PHSS 6 AS535 SCREW 10 52 X 1 2 BHSS 2 7 AS543 SCREW SET 10 32 X 3 8 2 8 AS201 PLANETARY SHORT aed 9 5505 PULLEY WRENCH AS404 PYRATHANE BELT 6 6 not illustrated U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 15 WELLS PARTS LIST for WHISPER ARM LONG DENTAL INC Product No AS052 5860 FLYNN CREEK ROAD BOX 106 COMPTCHE CA USA 95427 PHONE 707 937 0521 1 800 255 0521 707 937 2809 ey N 18 O Z 4 gt 2 REF PART NO DESCRIPTION QTY 1 5104 POST N A 6 2 amp 19 5211 WHISPER ARM PULLEY W WRENCH 6 5 5518 LONG STUD 4 AS533 HUB BOLT 5 AS108 ARM THUMBSCREW 2 3 6 AS209 BLOCK LONG 7 5558 WASHER 1 4 STAR SS 8 AS541 UT 1 4 28 THIN HEX SS 9 AS534 FIBER WASHER 2 Pse 19 0 AS587 4 ARM LONG 1 1 AS520 SHORT STUD 2 AS530 FELT WASHER 3 3 AS536 SCREW 10 32 X 5 8 BHSS OY 4 AS203 SPRING CAP 1 5 5537 SCREW 2 56 X 1 16 PHSS 6 AS535 SCREW 10 32 X 1 2 55 2 7 5545 SCREW SET 10 32 X 3 8 2 8 5207 PLANETARY LONG 9 5505 PULLEY WRENCH AS406 PYRATHANE BELT 9 8 not illustrated U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT WELLS 5860 FLYNN P O BOX 106 COMPTCHE CA USA
3. arm thumbscrew 7 3 FUSE REPLACEMENT 7 31 If the motor does not turn when the foot control pedal is pressed first check that the power cord is connected to alive receptacle Check the receptacle with a lamp or such to confirm that the power is on 7 3 2 1 the motor still does not turn disconnect the power cord and replace the fuse the foot control You order Wells part number F109 FUSE 5 AMP PKG 2 Use a type 3AG NORMAL BLOW 250 VOLT 5 AMP fuse ONLY Connect the power cord to a grounded receptacle 7 33 If the motor still does not turn follow the instructions for MOTOR BRUSH MAINTENANCE in paragraph 7 6 7 3 4 If the motor still does not turn when the pedal is pressed the fuse blows a second time contact Wells Dental Inc U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 10 7 4 ARM PULLEY REPLACEMENT 7 41 Disconnect the power cord and remove the belt 7 42 remove a pulley insert a AS505 PULLEY WRENCH 7 64 diameter rod into the hole behind the pulley and turn the pulley counterclockwise as you face the flat side of the pulley You will have to remove the pulley wrench and insert it into the opposite hole every half turn See Figure 8 7 4 3 To install pulley reverse the procedure of step 7 4 2 Make sure all the pulleys are tight 7 44 Install the belt See step 4 1 6 7 4 5 Adjust the belt tension See section 7 2 7 5 FOOT CONTROL LUBRICATION every six months
4. center of the motor base 7 6 7 Carefully turn the hood amp motor right side up and set it on a bench Slowly lift the hood and note how the wires are routed Lay the hood on its side next to the motor Do not disconnect any wires 7 6 8 Remove both brush caps and brushes Figure 10 Brush maintenance U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 11 7 6 9 The brushes will stop working when they are about 1 4 long If the length of the carbon brushes is less than 3 8 or the brushes are unequal lengths replace BOTH brushes as a set Use the brushes supplied in the accessory kit or order Wells part number E101 BRUSHES BODINE SMALL PKG 2 See Figure 11 7 6 10 Install the brushes making sure that they slide freely Do not over tighten the caps 7 6 11 Place the hood over the motor routing the wires as was noted in step 7 6 7 CAUTION Take extreme care that the wires do not lay on the motor shaft or get pinched under the hood 7 6 12 Fasten the four rubber feet install the pulley pulley guard arm assembly and belt Adjust the belt tension For further maintenance or repairs send the unit to WELLS DENTAL INC for factory service E101 BRUSHES BALDOR MOTOR PKG 2 1 8 x 3 16 5 8 3 17mm x 4 76mm x 15 87mm Figure 11 Replacement brushes RED BLACK BLACK BROWN ORANGE 5 WIRE i MOTOR YELLOW RED q f OUND TO q E
5. onto the threaded rod about 1 4 of a turn POSER re 65555555 9555 555 RRS Figure 6 Engage the thumbscrew 7 1 9 Push the thumbscrew forward and engage the bronze threads into the pulley 7 1 10 Insert a 3 32 shanked tool into the collet and tighten the thumbscrew 7 1 11 There should be from 1 16 to 1 8 bronze threads visible between the pulley and the hub of the thumbscrew when the thumbscrew is tight on a tool 1 16 TO 1 8 Figure 7 Check thumbscrew engagement 7 1 12 If less than 1 16 is visible remove the thumbscrew and return to step 7 1 8 but engage the thumbscrew onto the threaded rod 1 4 of a turn more this time A worn collet will require that the thumbscrew be engaged further onto the threaded rod 7 1 13 If more than 1 8 is visible remove the thumbscrew and return to step 7 1 8 but engage the thumbscrew onto the threaded rod a little less this time 7 1 14 Replace the nose cone and tighten it by hand using the rubber wrench Remove the rubber wrench DON T operate the Handpiece with a loose nose cone 7 2 BELT TENSION ADJUSTMENT 7 21 Disconnect the power cord 7 2 2 Loosen the arm thumbscrew and lift the block assembly until the tension spring is compressed about half an inch Tighten the
6. t use if the power cord motor switch or other parts are in poor condition Don t use if the unit has been dropped damaged or exposed to water Have a qualified service person inspect and replace parts when necessary 1 13 FOR LABORATORY USE ONLY The WELLS Engine Unit is intended for use by trained professional laboratory personnel Do not use the unit for any type of work done directly to a patient U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 3 2 0 PRODUCT DESCRIPTION The WELLS Engine Unit is designed for heavy duty laboratory service U905 ENGINE UNIT GRAY LONG ARM 230V E029 HOOD 8 MOTOR GRAY 230V 013 FOOT CONTROL 230V AS052 WHISPER ARM LONG 010 LABORATORY HANDPIECE with WRIST JOINT U906 ENGINE UNIT GRAY SHORT ARM 230V E029 amp MOTOR GRAY 230V F013 FOOT CONTROL 230V 5051 WHISPER ARM SHORT LABORATORY HANDPIECE with WRIST JOINT H010 U907 ENGINE UNIT CHROME LONG ARM 230V 028 HOOD amp MOTOR CHROME 230V 013 FOOT CONTROL 230V AS052 WHISPER ARM LONG 010 LABORATORY HANDPIECE with WRIST JOINT U908 ENGINE UNIT CHROME SHORT ARM 230V E028 HOOD amp MOTOR CHROME 230V F013 FOOT CONTROL 230V 5051 WHISPER ARM SHORT 010 LABORATORY HANDPIECE with WRIST JOINT 3 0 SPECIFICATIONS COLLET SIZE MAXIMUM HANDPIECE RPM Forward Reverse MAXIMUM NO LOAD MOTOR RPM ELECTRICAL RATING UNIT DIMENSIONS E028 and E029 Hood amp Motor F013 Foot Control H010 Labor
7. 95427 PHONE 707 937 0521 18 70 0807 022510 Q DENTAL INC CREEK ROAD 255 0521 7 937 2809 16 PARTS LIST for HANDPIECE WITH WRIST JOINT Product 010 5 4 REF PART NO DESCRIPTION QTY 1 2 3 4 5 ANDPIECE without WRIST JOINT 2 H108 THUMBSCREW 3 H102 COLLE 4 H104 OSE CONE 5 H110 RUBBER WRENCH 2 amp 3 H206 COLLET amp THUMBSCREW 4 amp 5 H208 OSE CONE WITH RUBBER WRENCH 6 7 8 amp 9 W011 WRIST JO 1 7 W102 RETAINING SCREW PKG 2 1 8 W505 SPRING CLIP 1 9 w509 PLUNGER 1 7 8 amp 9 W204 SPRING CLIP KIT WELLS DENTAL INC
8. CURE LOOSE ARTICLES Fasten long hair Do wear clothing necktie jewelry They can get caught in rotating and moving parts 1 6 USE PARTICLE MASK when there is dust particles the air 1 7 ALWAYS KEEP A TOOL IN THE COLLET Never operate the unit without a tool The handpiece thumbscrew and collet can come loose Ww 1 8 DO NOT EXCEED THE MAXIMUM OPERATING SPEED OF THE TOOL If a tool is operated at too high a speed it can fly apart and cause serious personal injury Always check the tool manufacturer s maximum operating speed for the tool being used Parting disks and polishing wheels usually have lower maximum operating speeds than the smaller diameter tools Position the belt onto the proper pulley diameter to limit the speed of the handpiece 1 9 MAINTAIN THE WHEEL OR TOOL Never operate with a damaged or bent tool It could break apart or come loose causing serious personal injury 1 10 CHECK TOOL IS SECURE Insert the tool shank into the collet to the MAXIMUM depth that will allow free rotation of the tool An extended tool is likely to break or bend causing serious personal injury Always check that the tool is securely held in the collet 1 11 KEEP CHILDREN AWAY All visitors should be safe distance from the work area Do not run the unit unattended 1 12 MAINTAIN THE UNIT Inspect periodically for damaged or worn parts Follow the instructions for maintenance Don
9. SCREW POWER CORD 3 Figure 12 Wiring diagram for Hood amp Motor U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 12 WELLS PARTS LIST for HOOD amp MOTOR 230V DENTAL INC Product No E028 or E029 5860 FLYNN CREEK ROAD BOX 106 COMPTCHE CA USA 95427 PHONE 707 937 0521 1 800 255 0521 707 937 2809 PART DESCRIPTION 1 527 SCREW 10 32 X 1 4 RHZC 5 SERB PULLEY GUARD W SCREWS 3 E124 HOOD GRAY or E120 HOOD CHROME 4 546 E110 5 WIRE CORD KIT 51 ESO4 CONNECTOR PRONG FEMALE 6 520 CORD STRAIN RELIEF 7 E134 CAPS BALDOR MOTOR PKG 2 8 BRUSHES BALDOR MOTOR PKG 2 9 E133 BALDOR MOTOR 230V O E20 WIRE CONNECTOR 5 1 500 OTOR BASE 114 RUBBER FEET PKG 4 3 530 SCREW 10 32 X 1 2 PHZC 4 4 510 RUBBER GROMMET 4 5 E540 LABEL FOR BALDOR BRUSH 6 E544 LABEL FOR E029 or 543 LABEL FOR E028 7 E150 OTOR PULLEY W SET SCREW 618 E112 POWER CORD KIT g E208 ACCESSORY KIT BALDOR MOTOR Includes replacement motor brushes 3 32 HEX WRENGH for pulley U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT WELLS Wa NC 5860 FLYNN CREEK ROAD P O BOX 106 CONPTCHE CA USA 95427 PHONE 707 937 0521 800 233 0521 Gon 937 2809 1
10. U807 022510 PAGE 13 PARTS LIST for FOOT CONTROL 230V Product No F013 REF PART NO DESCRIPTION QTY 1 F109 FUSE 5 PKG 2 2 514 FUSE HOLDER W NUT F511 FUSE LABEL 4 515 SCREW 10 52 X 5 4 RHZC 5 F206 RETURN SPRING KIT 6 F503 PLUG RETAINER 7 545 SCREW 6 32 X 3 8 CHCH 2 8 F590 CONNECTOR 6 PRONG MALE SUB 9 F560 REVERSING SWIICH 0 571 SCREW 10 32 X 3 8 THZC 2 1 F510 COVER INSULATION 1 2 F203 CIRCUIT BOARD KIT 230V 4 538 SCREW 4 40 X 1 4 TCSF 5 F573 WIRE WHT 18GA 2 3 4 6 526 SCREW 10 32 X 3 8 R 2 7 F542 SCREW 6 52 X 3 16 R 25 8 F500 PHENOLIC ARM 9 F540 SCREW 6 32 X 5 16 FHZC 20 F519 LABEL 230V 21 114 RUBBER FEET 4 22 F508 BASE COVER 23 F113 PLUG RETAINER KIT 24 F202 MALE CONNECTOR KIT WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 14 WELLS PARTS LIST for WHISPER ARM SHORT DENTAL INC Product No AS051 5860 FLYNN CREEK ROAD BOX 106 COMPTCHE CA USA 95427 PHONE 707 937 0521 1 800 233 0521 FAX 707 937 2809 PART NO DESCRIPTION QTY AS104 POST A 5211 WHISPER ARM PULLEY W WRENCH 6 5518 LONG STUD 4 AS533 HUB BOLT 5 AS108 ARM THUMBSCREW 2 3 6 AS205 BLOCK 5 7 AS538 WASHER 1 4 STAR SS 8 AS541 UT 1 4 28 THIN HEX SS gt S 9 AS534 FIBER WASHER 2 19 0 5581 4 ARM SHORT 1 1 5520
11. WELLS DENTAL 5860 FLYNN CREEK ROAD READ ALL INSTRUCTIONS P O BOX 106 BEFORE PROCEEDING COMPTCHE CALIFORNIA U S A 95427 SAVE THIS FOR FUTURE REFERENCE THIS PRODUCT IS FOR PROFESSIONAL LABORATORY USE ONLY USER S MANUAL WELLS ENGINE UNIT 230 VOLT Product No U905 U906 U907 U908 SALES CUSTOMER SERVICE TECHNICAL ASSISTANCE CALL TOLL FREE 1 800 233 0521 PHONE 707 937 0521 FAX 707 937 2809 MONDAY FRIDAY 8 00 a m 4 30 p m P S T DENTAL EQUIPMENT FOR TECHNICIANS WHO VALUE TIME AND QUALITY USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 2 1 0 SAFETY INSTRUCTIONS WARNING WHEN USING ELECTRIC TOOLS BASIC SAFETY PRECAUTIONS SHOULD ALWAYS BE FOLLOWED TO REDUCE THE RISK OF FIRE ELECTRIC SHOCK AND PERSONAL INJURY INCLUDING THE FOLLOWING ITEMS 1 1 GROUND THE DEVICE This machine must be grounded while in use to protect the user from electric shock Connect to a properly grounded receptacle only If in doubt have a licensed electrician check the receptacle for PROPER GROUNDING 1 2 HANDLE WITH DRY HANDS Never handle the plug power cord or any part of this unit with wet hands 1 3 DISCONNECT THE POWER CORD Before adjusting the belt removing the collet or servicing unplug the power cord to prevent unintentional starting or electric shock 1 4 ALWAYS USE SAFETY GLASSES Wear industrial certified safety glasses for ALL work and maintenance 1 5 SE
12. atory Handpiece with Wrist U905 amp 0907 Engine Unit Long Arm Normal working position U906 amp U908 Engine Unit Short Arm Normal working position 230 Volts WEIGHT E028 and E029 Hood amp Motor F013 Foot Control 5052 Whisper Arm Long 5051 Whisper Arm Short H010 Laboratory Handpiece with Wrist U905 amp U907 Engine Unit Long Arm U906 amp U908 Engine Unit Short Arm 9905 0906 0907 amp U908 Shipping Weight BELTS AS406 Pyrathane Belt 9 8 long arm AS404 Pyrathane Belt 6 6 Short arm APPROVAL 3 32 24000 RPM 20000 RPM 13000 RPM 1 0 Amps 60 Hz DC Single Phase 6 x 8 x 6 high 4 11 x 5 5 high 1x 1 x 6 long Joint JONU ua g 3 32 dia 3 32 dia Electrical Testing Laboratory City of Los Angeles No 245979 U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 4 WELLS ENGINE UNIT PRODUCTS NO U905 U906 U907 amp U908 HOOD amp MOIOR LOC RM THUMBSCREW OST PRING CAP HISPER ARM ANETARY HANDPIECE THUM LABORATORY HAN WRIST JOINT FOOT CONTROL pre ee Oo eh lt FORWARD ROTATION Figure 1 Engine Unit features U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 5 4 0 INSTALLATION 4 1 ASSEMBLY 41 Unpack and inspect all the
13. components Check that the following items were shipped Hood amp Motor Accessory kit which contains one pair of motor brushes and a 3 32 hex wrench Foot Control Whisper Arm and belt Handpiece with Wrist Joint and rubber wrench User s Manual 41 2 Set the Hood amp Motor a solid level surface 4 1 3 Remove the Whisper Arm from the carton Loosen the arm thumbscrew and remove the post Insert the long flat end of the post into the opposite bottom side of the block With the post all the way in tighten the arm thumbscrew 41 4 Place the post and arm into the support on the hood Swing the arm to center over the hood 4 1 5 Remove the Handpiece with Wrist Joint from the carton Insert the Wrist Joint onto the end of the arm and push to snap it into place 4 1 6 To install the belt first loop the belt around the motor pulley Bring both sides of the belt over the block pulleys See Figure 1 Continue both sides over the spring cap pulleys Continue under the planetary pulleys Now with the Handpiece pointing down loop the belt around the small handpiece pulley Next put one side of the belt under a wrist joint pulley Finally stretch the belt under the other wrist joint pulley The belt may look too short but go ahead and stretch it 41 7 belt tension may be adjusted by loosening the arm thumbscrew and lifting the block until the tension spring is compressed about half an inch Tighten the arm thumbscrew A new belt will stretch a
14. ess the pedal slowly until the motor starts rotating Hold the pedal in this position and turn the trimmer to select the desired speed Take care not to turn the trimmer beyond its limits of about one full turn Figure 2 Bottom of Foot Control U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 7 5 0 OPERATION WARNING READ ALL INSTRUCTIONS BEFORE OPERATING FAILURE TO COMPLY WITH INSTRUCTIONS COULD RESULT IN SEVERE PERSONAL INJURY AND OR PROPERTY DAMAGE 5 1 READY THE ENGINE UNIT 5 1 1 Check the tool manufacturer s maximum operating speed for the tool you are using 5 1 2 Disconnect the power cord before moving the belt to the desired pulley combination See the table below 5 1 3 Insert the tool shank into the collet to the MAXIMUM depth that will allow free rotation of the tool and tighten the handpiece thumbscrew 5 1 4 Connect the power cord to a receptacle with PROPER GROUNDING 5 2 FORWARD OPERATION 5 2 1 Remove the Handpiece from the hook and press the foot control pedal to increase the speed 5 3 REVERSE OPERATION 5 3 1 Depress the rear of the pedal with the heel and swing the front to the right with the toes until it clicks 5 3 2 Remove the handpiece from the hook and press the pedal for reverse operation 5 3 3 return to forward operation depress the rear of the pedal with the heel and allow the spring to swing the pedal to the left Figure 3 Re
15. he belt correctly See step 4 1 6 Re adjust the belt tension U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 6 4 3 4 3 1 4 3 2 4 3 3 4 3 4 4 4 4 5 4 5 1 BELT BREAK IN Be sure there is a tool in the handpiece collet and the thumbscrew is tight Remove the Handpiece from the hook and press the foot control pedal Run the Engine Unit for about ten minutes at various speeds Disconnect the power cord from the receptacle to prevent unintentional starting Re adjust the belt tension Loosen the arm thumbscrew and lift the block assembly until the tension spring is compressed about half an inch Tighten the arm thumbscrew HANDPIECE AND PULLEY BREAK IN The Wells Handpiece and arm pulleys will run hot when first put into operation This condition may last several days depending upon the amount of use The Handpiece and pulleys are run in at the factory until the bearing grease is channeled and running normally During shipping the grease re enters the bearing races and causes the Handpiece and pulleys to run hot again until the grease is re channeled SLOW SPEED ADJUSTMENT An electronic trimmer located in the Foot Control regulates the slowest speed the motor will run Adjust the trimmer by inserting a small screwdriver through the hole in the foot control base cover See Figure 2 ADJUST c TRIMMER Place the Foot Control upside down on a bench Pr
16. nd will require re adjustment 4 1 8 Insert a tool with a 3 32 shank into the handpiece collet and tighten the handpiece thumbscrew 4 1 9 If the electric cord s to go through hole the bench top or partition bore a 1 1 4 hole and pass the cord s through 4 1 10 Remove the Foot Control from the carton Connect the six prong cord socket to the Foot Control It will only fit one way Slip the plug retainer over the connector to hold it in place 4 1 11 Make sure that both electric cords are clear of the motor pulley and the belt Secure them out of the way if necessary 4 1 12 Connect an appropriate 230 volt plug to the end of the bare power cord Connect the plug to a 230 volt grounded receptacle WARNING To prevent danger of electrical shock connect the power cord to a receptacle with PROPER GROUNDING 4 2 CHECK FOR CORRECT ROTATION 42 1 Be sure there is a tool in the handpiece collet and the thumbscrew is tight 4 2 2 Check that the belt is properly positioned over each pulley For now use the large motor pulley and the small handpiece pulley 4 2 3 Remove the Handpiece from the hook and slowly press the foot control pedal until the Handpiece is rotating 424 If the rotation of the handpiece thumbscrew is forward clockwise the rotation is correct See Figure 1 Continue with step 4 3 BELT BREAK IN 4 2 5 If the rotation is counterclockwise the belt has been installed incorrectly Disconnect the power cord install t
17. r the rubber wrench If the nose cone is still too tight use another pair of pliers padded with rubber or cloth on the smooth LARGER diameter of the handpiece body See Figure 4 Never use pliers on the knurled or labeled section of the handpiece body Figure 4 Remove the nose cone 7 1 3 Remove the thumbscrew from the rear and pull the collet out the front 7 1 4 Use 3 32 drill or small burr to remove material packed in the bottom of the collet Wash the collet thumbscrew and nose cone in solvent Solvent may be used on these disassembled parts only Dry the parts thoroughly 7 1 5 Clean the hole in the end of the handpiece shaft with a pipe cleaner a small cloth on the end of a burr shaft 7 1 6 Put a THIN film of grease or Vaseline outside the collet on the threaded portion of the rod on the thumbscrew threads and the nose cone threads DO NOT use oil 7 1 7 CAUTION Insert the collet carefully IMPORTANT With a VERY SLIGHT pressure on the end of the collet turn it slowly until it engages with the flat Slide it in until it seats into the shaft DON T force the collet Figure 5 Insert the collet U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 9 7 1 8 Hold the collet all the way so the threaded rod protrudes from the pulley Engage the thumbscrew
18. verse To leave the WELLS Engine Unit unattended unplug the power cord from the receptacle CAUTION DISCONNECT THE POWER CORD WHEN USE 6 0 PULLEY RATIOS Pulley combinations may be selected to limit the handpiece RPM to keep from exceeding the tool manufacturer s recommendations For the maximum RPM place the belt on the LARGE motor pulley and the SMALL handpiece pulley Other pulley combinations will limit the handpiece RPM according to the table below MOTOR HANDPIECE MAX FORWARD MAX REVERSE PULLEY PULLEY HANDPIECE RPM HANDPIECE RPM LARGE SMALL 24000 20000 SMALL SMALL 20000 17000 LARGE LARGE 18000 15000 SMALL LARGE 15000 12000 U807 022510 WELLS DENTAL INC USER S MANUAL for WELLS ENGINE UNIT 230 VOLT PAGE 8 7 0 MAINTENANCE CAUTION The bearings in the motor pulleys and Handpiece are permanently lubricated with special compounds If anything enters the bearings they will be damaged KEEP OIL SOLVENT AND COMPRESSED AIR AWAY from these components NO OIL NO SOLVENT NO AIR CAUTION There are no user serviceable parts inside the pulleys Wrist Joint or Handpiece except as described below DO NOT DISASSEMBLE these parts 7A CLEANING AND ADJUSTING THE COLLET The collet should be cleaned monthly or after 200 hours of service 7 44 Disconnect the power cord 7 1 2 Slide the rubber wrench provided onto the nose cone and unscrew it If the nose cone is too tight to remove by hand use a pair of pliers ove
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