Torque-Hub Planetary Final Drive W6CG Series Service Manual
Contents
1. TEAK TEST ADA TER Fimas 2 4 ALL LOOSE DETAILS TO ME STAMPED WITH THDR RESPECTIVE Duseo e DONOT SCALE PEFORT ERRORS I A TB was 3 4 l TH TOCE 2 MACH EQ 172 REDRAWN REDESIGNED 5 7 20 T 170237 39 T223989 ROLL TEST TOOL 50 INSANE eves ma ev cam TOMAANCE ON 008 KK DOMS UNLESS OTHERWISE SPECIREO CHAMPERS 04 X 45 RADI 04 R SMUARTO STAMP PART NO STAMP TOOLNO 1 Tem ll 40 Mailing Address Shipping Address Fax E mail Website Planetary Final Drive Repair Instructions With more than 90 years of experience Fairfield Manufacturing Co Inc has become the largest U S non captive producer of gears custom gear assemblies planetary final drives and related gear products Fairfield Manufacturing Co Inc headquartered in Lafayette Indiana USA is distinguished by our extensive design manufacturing and applications engineering capabilities Our 500 000 square foot plant is a modern fully equipped manufacturing facility that includes a full service heat treat department Our philosophy of synchronous engineering is a partnership that matches our best and brightest people with your people to evaluate your unique requirements and devel2. 4 Remove the two Pipe Plugs 1L from the Housing 1G This concludes the Housing Spindle Disassembly 16 Planetary Final Drive Service Manual Input Coupling Disassembly CAUTION Safety glasses must be worn during this next steps 1 Remove Internal Retaining Ring 20 from the groove Coupling 19 2 Remove the Retaining Ring 21 from the groove of the Coupling 19 This concludes the Carrier Disassembly Brakes 17 THIS PAGE INTENTIONALLY LEFT BLANK ASSEMBLY Planetary Final Drive Service Manual Input Carrier Subassembly Apply a liberal coat of grease to the bore of the Planet Gear 3F This will enable the Needle Rollers 3C to be held in place during assembly Install Needle Rollers 3C into the bore of the Planet Gear 3F NOTE The last roller installed must be installed end wise That is the end of the last roller must be placed in between the ends of the two rollers that form the space and then slide parallel to the other rollers into place Place the Carrier 3A into the tool fixture so that one of the roll pin holes is straight up Start Planet Shaft 3E with end opposite roll pin hole first through the planet shaft hole in Carrier making sure that the roll pin hole with the large chamfer in the planet shaft is straight up Grease and install two Thrust Washers 3B onto the end of Planet Shaft 3E Continued on Next Page 20 6 Place the Planet Gear 3F into position
3. CARRIER SUBASSEMBLY 29 Number 1A 1B 1C 1D 1G 1H 1 1J 1L Planetary Final Drive Repair Instructions Parts List Qty Description SPINDLE LIP SEAL 20 TAPERED BEARING CUP TAPERED BEARING CONE HOUSING STEEL SHIM BEARING CARRIER SOCKET BOLT MAGNETIC PIPE PLUG STUD SEAL BOOT INTERNAL GEAR CARRIER THRUST WASHER BEARING NEEDLE PIN ROLL PLANET SHAFT PLANET GEAR CARRIER THRUST WASHER BEARING NEEDLE THRUST WASHER PLANET SHAFT PLANET GEAR ROLL PIN O RING MAGNETIC PIPE PLUG ID PLATE SCREW DRIVE HEXAGONAL BOLT COVER CAP O RING O_RING SUN GEAR INPUT SPACER THRUST WASHER INPUT SHAFT HEXAGONAL BOLT 30 Number Qty Description SHOULDER BOLT COUPLING INTERNAL RETAINING RING EXTERNALRETAINING RING 31 Planetary Final Drive Repair Instructions Assembly Tools T155655 BEARING CUP ASSEMBLY TOOL AMT MATS STOCK 1121 OR PATTERN FAIRFIELD MANUFACTURING Co LAFAYETTE INDIANA Dne ac THON c 45 50 32 T148965 ASSEMBLY TORQUING FIXTURE TOOL Sew tutu m Tae pene ance i 1 pa canotto DUP Buasts 4 rron Racu pos 2 IRERT LETT ozr 7 N Gow onr uS Two CARB 5 08
4. CUTTING EOSES TOLERANCE ON DIMENSIONS UNLESS OTHERWISE SPECIFIED FULE STAMP TOOL NC T 160969 35 T160299 CRADLE FOR STAKING PINS 36 T159975 CRADLE FOR STAKING PINS Faz DIA DRWY THRI Vez pa co Bose I2 2 TOP Tuan DST 2 MOLES LOC 55 N ONE rim BTL MICRCF 0 Lor L FAIRFIELD MANUFACTURING Co LAFAYETTE INDIANA Ni LOOSE GET AILS TORE STAMPED WITH THEIR RESPECTIVE WUNDGRS BREAN ALL CORNERS EXCEST CUTTING POSES DOMOTSCALE REPORT ERRORS 85 ra 1 TTAW PART Toot 12 37 9 5 3 T211488 STUD FOR PRESSING FIXTURE 404 Nevis Sv CHD vas 03 SONS 4330 OF 38 T170237 LEAK TEST TOOL 73 DIA 7 6 pia Be 7 a 5 pia 1 Dia DRILL THRY 4 995 THO amu WELD TYR 2 570 wing NUT STOCK SIZE OR PATTERN FAIRFIELD MANUFACTURING Micros LAFAYETTE INDIANA SHEET luri
5. HO CAES Hb 33 T160970 SEAL ASSEMBLY PRESSING TOOL 4 000 5 188 ONE 4140 Q amp T DRAW Rc 28 34 GRD uA 1 625 DRILL THRU 9 HOLES EG SPACED LOCATE AS SHOWN 1 000 P FITTO ON A 96 000 1 i DET 101 i 101 ONE 4140 STL DRAW Rc 43 48 GRD SG 29 750 STOCK SIZE OR PART NUMBER FAIRFIELD ENGINEERED DRIVE SOLUTIONS SEAL ASSEMBLY PRESSING TOOL LAFAYETTE 0 5 AL LOOSE DETAILS BE STAMPED WITH THEIR RESPECTIVE NUMBERS BREAK ALL CORNERS EXCEPT CUTTING EDGES TOLERANCE ON DIMENSIONS UNLESS OTHERWISE SPECIFIED 1005 XX 015 X 2 03 UNLESS OTHERWISE SPECIFIED CHAMPERS 04 X 45 RADII 06 R FULL DO NOT SCALE DRAWING REFORT ERRORS CDK 02 17 86 STAMP PART NO STAMP TOOL NO W6CG0ZD26 T 160970 DRAWN 34 T160969 ASSEMBLY PRESSING TOOL 00 DIA 2 4340 STL 22 6 75 DRAW TO 37 40 UNLESS OTHERWISE SPECIFIED ALL CHAMFERS 06 45 RADII 36 R REWORK 6 00 DIA 7 50 DIA FAIRFIELD FORCE THE FUTURE LAFAYETTE INDIANA USA TOOL ASSEMBLY PRESSING TOOL INSTALL 36990 CONE ALL LOOSE CETAILS TO BE STAMPED WITH THEIR RESPECTIVE NUMBERS BREAK ALL CORNERS EXCEPT
6. Pipe Plugs 41 into the Carrier 4A using thread sealant This concludes the Output Carrier Subassembly 23 Planetary Final Drive Service Manual Input Coupling Subassembly CAUTION Safety glasses must be worn during these next steps 1 Install External Retaining Ring 21 into groove of the Coupling 19 2 Install Internal Retaining Ring 20 into the groove of the Coupling 19 This concludes the Carrier Subassembly Brakes 24 Planetary Final Drive Service Manual Housing Spindle Subassembly NOTE Spray a light film of oil on all component parts during assembly Spray a generous amount of oil on bearings during installation 1 Place Hub 1G on the table with long end up Press one Bearing Cup 1C into bearing counter bore of until seated against shoulder in housing Use Tool T155655 2 Turn Hub 1G over and press Bearing Cup 1C into bore until it bottoms out 3 Place one Bearing Cone 1D into the Bearing Cup 1C NOTE Generally seals should not be reused 4 Install Seal 1B into Hub 1G until it flush with end of Hub 1G 5 Assemble Seal Boot 1Q onto the end of Hub 1G outside diameter if required and grease the face of Seal Boot 1Q 6 Press Bearing Cone 1D onto Bearing Carrier 11 until it bottoms on the flange of Bearing Carrier 11 Continued on Next Page 25 10 11 12 13 Place Spindle 1A on the table with splined end up Make sure that threaded hole in th
7. and push the Planet Shaft 3E through the planet gear 3F without going all the way through Carrier 3A 7 Slide two more Thrust Washers 3B between Planet Gear 3F and Input Carrier 3A Slide Planet Shaft 3E through and into Input Carrier 3A 8 Align the chamfered side of the Planet Shaft hole with the roll pin hole of the Input Carrier using a 1 8 inch punch 9 Drive the Roll Pin 3D into the roll pin hole in Carrier and into the Planet Shaft until the end of the roll pin is flush with the outside diameter of Carrier 3A 10 Repeat steps 1 to 9 for the remaining two Planet Gears 3F This concludes the Input Carrier Subassembly 21 Planetary Final Drive Service Manual Output Carrier Subassembly E Apply a liberal coat of grease to the bore of the Planet Gear 4F This will enable the Needle Rollers 4C to be held in place during assembly Install Needle Rollers 4C into the bore of the Planet Gears 4F NOTE The last roller installed must be installed end wise That is the end of the last roller must be placed in between the ends of the two rollers that form the space and then slide parallel to the other rollers into place Grease and install Thrust Washer 4D into the bore of Planet Gear 4F on top Needle Rollers 4C Install second set of Needle Rollers 4C into the bore against Thrust Washer 4D of the Planet Gear 4F Place the Carrier 4A into th
8. anual Main Assembly INPUT COUPLING SUBASSEMBLY HUB SPINDLE SUBASSEMBLY INPUT CARRIER SUBASSEMBLY 1 Install Internal Gear 2 onto Hub Spindle Sub Assembly 2 Install Thrust Washer 12 onto the groove of Internal Gear 2 3 Install Input Shaft 13 into the groove in the Internal Gear 2 4 Install Input Carrier Sub Assembly onto the Internal Gear 2 NOTE Insure the teeth of Carrier is properly meshing with the teeth of Input Shaft 13 5 If necessary grease and install Input Spacer 7 onto the bore of the Input Shaft 6 6 Install Input Shaft with Input Spacer onto the Input Carrier Subassembly Continued on Next Page 27 10 11 12 13 Grease and install O Ring 5 onto the groove in the Hub 1G Install Output Carrier Subassembly onto the Hub Spindle Assembly Turn unit over and install the Input Coupling Subassembly bore of the Spindle Tighten four Shoulder Bolts 18 onto the reamed holes of Hub 1G to a torque of 45 47 ft lbs use Loctite 263 Apply Loctite 263 and install twenty Hexagonal Bolts 17 to a torque of 45 47 ft lbs Install Pipe Plug 41 into Cover Carrier 4A using thread sealant The unit should now be leak and roll checked as per instructions on page 5 and 6 This concludes the Main Assembly 28 Planetary Final Drive Service Manual Assembly Drawing INPUT COUPLING SUBASSEMBLY HUB SPINDLE SUBASSEMBLY INPUT CARRIER SUBASSEMBLY OUTPUT
9. ary Final Drive Service Manual Tightening and Torguing Bolts If an air impact wrench is used to tighten bolts extreme care should be taken to ensure the bolts are not tightened beyond their specified torque The following steps describe how to tighten and torque bolts or socket head cap screws in a bolt circle BOLT A Tighten but do not torque bolt A until snug Go to the opposite side of the bolt circle and tighten bolt B until equally snug Crisscross around the bolt circle and tighten the remaining bolts Use a torque wrench to apply the specified torque to bolt A Using the same sequence crisscross around the bolt circle and apply an equal torque to the remaining bolts General Properties Planetary Final Drive Service Manual Lubrication Information The lubricant used in most Torque Hub drives should be petroleum based gear fluid containing anti oxidation anti foaming and extreme pressure additives The lubricant should have a minimum viscosity index of 95 cst and maintain a minimum viscosity of 40 cst under normal operating conditions Some applications require special considerations consult the machine manufacturer and Oerlikon Fairfield for more additional information The table below lists the recommended viscosities for various ambient operating temperatures These recommendations are based on temperature rise of 50 to 100 F at normal operating conditions Differential Planetary Si
10. ate the gears in the unit applying constant force to the roll checker If more drag is felt in the gears only at certain points then the gears are not rolling consistently and easily and should be examined for improper installation or defects Some gear packages roll with more difficulty than others Do not be concerned if the gears in the unit seem to roll hard as long as they roll with consistency Rotate the gearbox both clockwise and counterclockwise the same number of turns as the ratio of the unit The gearbox ratio is the same number as the last three numbers on the ID tag ROLL CHECK TOOL Model Code Roll Test Tool W6CGXXXXXXXX T223989 The Leak Test The purpose of a leak test is to make sure the unit is airtight The unit has a leak if the pressure gauge reading on your leak check fitting starts to fall after the gearbox has been pressurized and allowed to equalize Leaks will most likely occur at the pipe plugs the main seal or wherever o rings or gaskets are located The exact location of a leak can usually be detected by brushing a soap and water solution around the main seal and where the o rings or gaskets meet on the exterior of the unit and then checking for air bubbles If a leak is detected in a seal o ring or gasket the part must be replaced and the unit rechecked Leak test at 10 psi for 20 minutes LEAK CHECK TOOL Model Code Leak Test Tool W6CGXXXXXXXX T170237 Planet
11. cerlikon fairfield Torque Hub Planetary Final Drive W6CG Series Service Manual Rev 03 07 13 While every precaution has been taken in the preparation of this document Fairfield Manufacturing Co Inc assumes no liability with respect to the use of the documentation described herein or for any act or omission of Fairfield Manufacturing Co Inc concerning this documentation Torque Hub is a registered trademark of Fairfield Manufacturing Co Inc Features and specifications are subject to change without notice Disassembly Instructions Assembly Instructions General Information Planetary Final Drive Service Manual Content Introduction Roll and Leak Test Tightening and Torquing Bolts Lubrication Information Main Disassembly Output Carrier Disassembly Input Carrier Disassembly Housing Spindle Disassembly Input Coupling Disassembly Input Carrier Subassembly Output Carrier Subassembly Input Coupling Subassembly Housing Spindle Subassembly Main Assembly Assembly Drawing Parts List Assembly Tools Contact Information Planetary Final Drive Service Manual Introduction This manual is a step by step guide to the disassembly and assembly of the W6CG Torque Hub units It is designed for the customer or mechanic who is repairing this particular Torque Hub model Users of this manual should note that each part mentioned is followed by an identification number enclosed in parentheses These part numbers may be ref
12. e Spindle in the face adjacent to splines are clean and oil free Oil the seal diameter with finger print oil Be careful not to get oil into threaded hole in the Spindle 1A Turn Hub Bearing seal assembly over and lower onto Spindle 1A Locate Bearing Cone onto the Spindle 1A against shoulder BEARING SETUP Place Bearing Carrier 11 and Bearing Cone 1D onto Spindlle 1A and Bearing Cup 1 Use two Bolts 1J in the holes next to small through holes Torque Bolts 1J to 35 40 ft lbs Use Loctite 263 Loosen the Bolts 1J and re torque to 150 in lbs Roll the Hub 1G Roll the Hub and check the bolt torque Re torque to 150 in Ibs if required Using a depth mic measure the distance from the surface of the Bearing Carrier 11 adjacent to the Bolt counter bores through the small holes in the Bearing Carrier down to the Spindle face record this length Disassemble the Bearing Carrier 11 and Bearing Cone 1D from the Spindle and measure the thickness of the Bearing Carrier 11 Subtract the Bearing Carrier 11 thickness from the distance measured in step 10 and add 0 0035 to this value This is thickness required for Shim 1H Assemble the Shims 1H onto Spindle 1A with the Bearing Carrier 11 Torque Bolts 1J to 35 40 ft lbs Use Loctite 263 Install Pipe Plugs 1L into Hub 1G pipe plug holes using thread sealant This concludes the Housing Spindle Subassembly 26 Planetary Final Drive Service M
13. e off the shaft as it is removed Remove O Ring 4H from the slot of the Planet Shaft 4E and discard O ring Using a hammer and punch drive the Roll Pin 4G out of the Planet Shaft 4E and Carrier 4A Remove first set of Needle Bearings 4C from the inside of the Planet Gear 4F Remove Thrust Washer 4D from Planet Gear 4F Remove second set of Needle Bearings 4C from the inside of the Planet Gear 4F Repeat steps 1 7 for the remaining two Planet Gears 4F Remove four Hexagonal Bolts 4M from the Cover Cap 4P Continued on Next Page 12 10 Remove Cover Cap 4P from the Carrier 4A 11 Remove O Ring 4S from the flange of Cover Cap 4P and discard it This concludes the Output Carrier Disassembly 13 Planetary Final Drive Service Manual Input Carrier Disassembly 1 Drive Planet Shaft 3E out of the planet shaft holes forcing the Roll Pin 3D to sheer off 2 Hold on to the Planet Gear 3F and push the Planet Shaft 3E out of the Carrier 3A The Thrust Washers 3B will slide off the shaft as it is removed 3 Using a hammer and punch drive the Roll Pin 3D out of the Planet Shaft 3E and Carrier 3A 4 Remove Thrust Washer 3B from internal groove of the Carrier 3A 5 Remove Planet Gear Subassembly from the Input Carrier 3A 6 Remove Needle Bearings 3C from the Planet Gear 3F 7 Repeat the Steps 1 to 6 for the remaining two Planet Gears 3F This concludes the Inpu
14. e tool fixture so that one of the roll pin holes is straight up Grease O Ring 4H and install into groove in Planet Shaft 4E Start Planet Shaft 4E with end with roll pin hole first through the planet shaft hole in Carrier 4A making sure that the roll pin hole with the large chamfer in the planet shaft is straight up Continued on Next Page 22 10 11 12 13 14 15 16 Grease and install two Thrust Washers 4B onto the end of Planet Shaft 4E Install the Planet Gear 4F into position in Output Carrier 4A and push Planet Shaft 4E into Planet Gear 4F without going all the way through Slide two more Thrust Washers 4B between Planet Gear 4F and Output Carrier 4A Slide Planet Shaft 4E through and into Output Carrier 4A Be careful not to shear the O Ring 4H Align the chamfered side of the Planet Shaft 4E hole with the roll pin hole of the Output Carrier 4A using a pin punch Drive the Roll Pin 4G through the Output Carrier 4A and into the Planet Shaft 4E until flush with Output Carrier 4A Repeat Steps 1 thru 11 for the installation of the remaining Planet Gears 4F Install O ring 4S onto the hub of the Cover Cap 4P and against the flange Assemble Cover Cap 4P into the Carrier 4A align the holes in the flange with the holes in the Carrier 4A Install 4 Hex bolts 4M through the Cover Cap 4P into the Carrier 4A and torque to 70 80 in Ibs Install
15. erred to in the Parts List and Assembly Drawing sections of this manual Specialized tools used to assemble this unit are noted in the assembly procedures and diagrammed in the Assembly Tools section Users should familiarize themselves with the procedures for roll and leak testing as well as bolt tightening and torquing found on the following three pages before starting any repairs Standard safety practices should be followed during the disassembly and assembly procedures described Safety glasses and safety shoes should be worn and heavy heat resistant gloves should be used when handling heated components Be especially alert when you see the word CAUTION This indicates that a particular operation could cause personal injury if not performed properly or if certain safety procedures are not followed The word NOTE is used to bring attention to certain procedures or helpful hints that will aid in the disassembly and assembly process The Roll Test Continued on Next Page Planetary Final Drive Service Manual Roll and Leak Test Torque Hub units should always be roll and leak tested before disassembly if possible and after assembly to make sure the unit s gears bearings and seals are working properly The following information briefly outlines what to look for when performing these tests The purpose of the roll test is to determine if the unit s gears are rotating consistently easily and properly It should be able to rot
16. mple Planetary Ambient AGMA AGMA ISO Index Lubricant ISO Index Lubricant p Number Number 40 to 5 F VG100 SEP VG100 3EP 5 to 40 F VG150 4EP VG100 SEP 40 to105 VG220 VG320 5EP 6EP VG150 VG220 4EP 5EP 105910 150 VG460 7EP VG320 6EP Footnotes 1 For operation in this ambient temperature range synthetic oil is recommended with a pour point of 10 F lower than the minimum ambient temperature 2 Foroperation in this ambient temperature range synthetic oil is recommended for proper lubricant life at elevated temperatures Maintenance Oil Fill Level Oil amounts for each series of Torque Hub drives are indicated in the appropriate series literature An initial oil change should be made after the first 50 hours of operation Subsequent oil changes should be made at 1 000 hour intervals or annually whichever comes first Oil temperatures should be not higher than 160 to 180 F for continuous operation and no higher than 200 F for intermittent operation For special applications high horsepower high speeds or wide temperature changes please consult Oerlikon Fairfield When the Torque Hub unit is mounted horizontally unless otherwise specified the gearbox should be filled half full of oil Consult the appropriate series literature for approximate fill volumes Vertically mounted Torque Hub units may require special lubrication procedures Please c
17. ontact Oerlikon Fairfield for vertically mounted applications DISASSEMBLY Planetary Final Drive Service Manual Main Disassembly 4 1 Perform a roll check and leak check prior to disassembling the unit 2 Remove two magnetic Pipe Plugs 41 and the oil out of the gearbox NOTE Record the condition and volume of the oil 3 2 four Shoulder Bolts 18 twenty Hexagonal Bolts 17 from the Output Carrier 4 Lift the Output Carrier Subassembly 4A off of the unit 5 Remove the O Ring 5 from the unit Discard the O Ring Continued on Next Page 10 INPUT COUPLING SUBASSEMBLY HUB SPINDLE SUBASSEMBLY INPUT CARRIER SUBASSEMBLY 6 Remove Sun Gear 6 from Input Carrier Subassembly 7 If necessary remove Input Spacer 7 from the bore of Sun Gear 6 8 Lift out the Input Carrier Subassembly from Internal Gear 2 9 Remove the Input Shaft 13 out of the Spindle 1A 10 Remove Thrust Washer 12 from the Internal Gear 2 11 Remove Internal Gear 2 from Hub Spindle Subassembly 12 Remove Input Coupling Subassembly from the Hub Spindle Subassembly This concludes the Main Disassembly 11 Planetary Final Drive Service Manual Output Carrier Disassembly a Drive Planet Shaft 4E out of the planet shaft holes forcing the Roll Pin 4G to shear off Hold on to the Planet Gear 4F and push the Planet Shaft 4E out of the Carrier 4A The Thrust Washers 4B will slid
18. op products and assemblies that meet your needs For more information contact Fairfield Manufacturing Co Inc today Fairfield Manufacturing Co Inc U S 52 South P O Box 7940 Lafayette IN 47903 7940 2309 Concord Road Lafayette IN 47909 Main 765 772 4001 Applications Engineering 765 772 4011 Sales and Service 765 772 4010 Applications Engineering apps fairfieldmfg com Sales sales fairfieldmfg com www oerlikon com fairfield 41 cerlikon fairfield Oerlikon Fairfield U S 52 South P O Box 7940 Lafayette IN 47903 USA 765 772 4000 www oerlikon com fairfield 42
19. t Carrier Disassembly 14 Planetary Final Drive Service Manual Housing Spindle Disassembly 1 Set the unit on a bench so that the Spindle 1A flange is down 2 Remove the twelve Bolts 1J from Spindle 1A through the Bearing Carrier 11 3 Remove the Bearing Carrier 11 from the Spindle 1A 4 Remove the Bearing Cone 1D from the Bearing Carrier 11 CAUTION The Shim edges are sharp wear gloves when handling or installing Shims to prevent injury 5 Remove the Shims 1H out of the Housing 1G Continued on Next Page 15 USING DEAD BLOW HAMMER ON THE HOUSING DRIVE THE BEARING CONE OFF THE SPINDLE SUPPORT SPINDLE USING SUPPORT BASE 6 Turn over the unit and carefully place the unit on a support base until the Spindle 1A rests on it Ensure there is enough gap to lower the Housing 1G down 7 Use a dead blow hammer on the Housing 1G flange to drive the Housing 1G off of the Spindle 1A 8 Lift the Spindle 1A out of the Housing 1G 9 Remove Boot Seal 1Q from the Spindle 1A 10 Remove Lip Seal 1B from the Housing 1G 11 Remove outboard Bearing cone 1D from the Housing 1G 12 Using a hammer and punch drive the inboard Bearing Cup 1C out of the Housing 1G Be careful not to damage the counter bore in the housing 13 Turn the Housing 1G over drive the outboard Bearing Cup 1C out of the Housing Be careful not to damage the counter bore in the housing 1
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