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Rev-2 April 1 , 1994 Price $20.00 71 C -72C Direct Drive and Reduction Ratios 1.5:1, 1.88:1, 1.91:1, 2.1:1, 2.57:1,2.91:1 -..·· '.. ' ' Borg·Warner Automotive Diversified Transmission Products Corporation Marine & Industrial Transmissions 200 Theodore New Bedford Rice Boulevard Massachusetts Industrial 02745 Park Telephone 508 995 2616 FAX 508 998 1579 This manual reflects the transmission models as of April 1986. Later models may have differences. The following direct-drive and reduction models are covered in this manual: Transmission Previous Trans. Transmission Ratio Assembly Number Assembly Number Forward Reverse 1 0-1 7-000-001 AS1 -71 C 1:1 1 : 1 1 0-1 7-000-002 1:1 1: 1 1 0-1 7-000-003 1:1 1:1 1 0-1 7-000-004 1:1 1:1 1 0-1 7-000-005 AS2-71 C 1.52:1 1.52:1 1 0-1 7-000-006 AS2-71 CR 1.52:1 1.52:1 1 0-17-000-007 AS7-71C 1.91 :1 1.91 :1 1 0-1 7-000-008 AS7-71CR 1.91 :1 1.91 :1 1 0-1 7-000-009 AS3-71 C 2.1 0:1 2.1 0:1 10-17-000-010 AS3-71CR 2.10:1 2.10:1 2.57:1 2.57:1 10-17-000-011 AS14-71C 2.57:1 2.57:1 10-17-000-012 AS14-71CR 2.91 :1 2.91 :1 1 0-17-000-013 AS15-71C 2.91 :1 2.91 :1 10-17-000-014 AS15-71CR 1:1 1:1 10-1 7-000-01 5 AS20-71C 1:1 1 :1 10-17-000-016 AS20-71CR 1.88:1 1.88:1 10-1 7-000-108 None 1:1 1.10:1 1 0·1 8-000-001 AS1 1 -72C 1 :1 1.10:1 1 0-1 8-000-002 AS1 1 -72CR 1.52:1 1.68:1 1 0-1 8-000-003 AS1 2-72C 1.52:1 1.68:1 1 0-1 8-000-004 AS1 2-72CR 1.88:1 2.07:1 1 0-1 8-000-1 06 None 1.91 :1 2.10:1 1 0-1 8-000-005 AS1 7-72C 1 .91 :1 2.1 0:1 1 0-1 8-000-006 AS1 7-72CR 2.1 0:1 2.31 :1 1 0-18-000-007 AS13-72C 2. 1 0:1 2.31 :1 1 0-1 8-000-008 AS1 3-72CR 2.57:1 2.83:1 1 0-1 8-000-009 AS1 4-72C 2.57:1 2.83:1 1 0-1 8-000-01 0 AS1 4-72CR 2.91 :1 3.20:1 1 0-1 8-000-01 1 AS1 5-72C 2.91 :1 3.20:1 1 0-1 8-000-0 12 AS15-72CR 1:1 1.10:1 1 0-1 8-000-0 1 3 AS20-72C 1:1 ' 1.10:1 ' 1 0-18-000-0 14 AS20-72CR 1:1 1.10:1 1 0-1 8-000-0 1 5 None 1 :1 1.10:1 1 0-18-000-1 06 None 1:1 1.10:1 1 0-1 8-000-01 7 None The following international symbols are used in this service manual. WARNING: THIS SYMBOL WARNS OF POSSIBLE PERSONAL INJURY. CAUTION: This symbol warns of possible damage to transmission. OEM: Original Equipment Manufacturer (Boat/Engine Manufacturer). TABLE OF CONTENTS Section Page • DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 B. Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . . 1 INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 B. Scheduled Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 B. Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 B. Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 OVERHAUL......................................................... 12 A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 B. Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 C. Cleaning.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 D. Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 E. Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 • • F. Assembly....................................................... 13 INSTALLATION....................................................... 28 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 1.523:1 REDUCTION UNITS............................................ 39 A. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 B. Overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 1.88:1 AND 1.91 :1 REDUCTION UNITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 A. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 B. Overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 48 2.57:1 AND 2.91:1 REDUCTION UNITS.................................... 58 A. Description . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 B. Overhaul....................................................... 58 2.10:1 REDUCTION UNITS............................................. 68 A. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 B. Overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 • ii LIST OF FIGURES Title Page 1 . 71 C and 72C Transmission Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Typical Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Forward Power Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4. Reverse Power Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5. Hydraulic Circuit Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6. Bushing Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7A. Shift Cable Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7B. Oil to Cooler Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 8. 71 C and 72C Transmission Assembly-Current Production . . . . . . . . . . . . . . . . . . 29 9. Optional Drive Gear Alarm Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 10. 1.523:1 Reduction Units-Current Production. . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 11. 1.523:1 Reduction Units-Early Production. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 12. 1.88:1 and 1.91:1 Reduction Units-Current Production . . . . . . . . . . . . . . . . . . . . 54 13. 1.88:1 and 1.91:1 Reduction Units-Early Production . . . . . . . . . . . . . . . . . . . . . . 57 14. 2.57:1 and 2.91:1 Reduction Units-Current Production . . . . . . . . . . . . . . . . . . . . 64 15. 2.57:1 and 2.91:1 Reduction Units-Early Production . . . . . . . . . . . . . . . . . . . . . . 67 16. 2.10:1 Reduction Units-Current Production.... ......................... 74 17. 2.10:1 Reduction Units-Early Production. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 LIST OF TABLES ... Title Page 1. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Scheduled Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4. Bolt and Fastener Torques (Non-Lubricated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5. Spring Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6. Test Pressures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 iii DESCRIPTION • SHIFT LEVER COOLER OUTLET (SEE FIG. 78, PAGE 28) COOLER RETURN NOTE: SHOWN WITHOUT REDUCTION UNIT Figure 1. 71 C and 72C Transmission Assembly -.. • • A. INTRODUCTION (See Figure 1 ). valve are forward-neutral-reverse. An internal regulator valve controls system pressure. Oil disThe 71 C and 72C transmissions consist of a charged by the regulator valve is sent to the oil planetary gear set and multiple disc clutches. cooler. The input and output shafts are in line. B. THEORY OF OPERATION. Hydraulic Pressure is provided by a crescent type pump. The pump is driven at engine speed General. Forward is direct drive. A planetary by the input shaft. Oil from the pump is sent to gear set (1.1 to 1.0 ratio for 72C, and 1.0 to 1.0 the control valve. The positions on the control ratio for 71 C) is used to obtain reverse. Table 1. Technical Specifications DESCRIPTION MODEL 71C MODEL 72C Speeds One Forward One Forward One Reverse One Reverse Horsepower Gasoline (maximum) 31 0 HP @ 4200 RPM 475 HP @ 4200 RPM Diesel (maximum) 182 HP@ 3200 RPM 274 HP @ 3200 RPM Torque and Input Speed See Ratings Charts See Ratings Charts (Form No. 1237) (Form No. 1237) Approximate Dry Weight Direct Drive 951b. 109 lb. Reduction 1451b . 1531b. • 1 The transmission oil pump is driven by the input shaft. It supplies oil pressure to operate the clutch packs, lubricate parts, and provide cooling. A damper plate is bolted to the engine flywheel. The damper plate is splined to connect to the input shaft. The damper plate reduces torsional vibrations to the transmission from the engine. (See Figure 2). ENGINE FLYWHEEL DAMPER ASSEMBLY 12717A Figure 2. Typical Installation Forward. The forward clutch is applied hydraulically when the shift lever is placed in the forward position. This connects the input shaft to the output shaft. The unit then transmits power at a 1 to 1 speed ratio in the same direction of rotation as the engine (See Figure 3). FORWARD CLUTCH 12668A Figure 3. Forward Power Flow Reverse. The reverse clutch is applied hydraulically when the shift lever is placed in the reverse position (See Figure 4). The applied clutch holds the ring gear. The input shaft and sun gear, driven by the engine, drive pinions, which drive the carrier output shaft. The output shaft turns opposite to engine rotation at a 1.1 to 1 speed reduction ratio for model 72C, and 1 to 1 speed ratio for model 71 C. CLUTCH 12647A Figure 4. Reverse Power Flow 2 • • Hydraulic Circuit. Oil from the sump enters the pump suction passage and is directed to the pump (See Figure 5). The pump supplies oil under pressure through passages to the control and regulator valves. Oil pressure on the end of the regulator valve moves the valve, compressing the spring. This movement allows oil to flow to the cooler. Selector Valve. The selector valve shifts the transmission from neutral to forward or reverse. When selector valve is placed in the forward position, oil is directed to the forward clutch. When the selector valve is placed in reverse position, oil is fed to the reverse clutch. When one clutch is engaged the other is exhausted by a slot in the selector valve. • PUMP PRESSURE SELECTOR VALVE SELECTOR VALVE FORWARD, NEUTR AL, OR RE VERSE RE VERSE CLUTCH PRESSURE TAP A 1/4" PIPE PLUG LOCATED IN ADAP TER AT TOP CENTER OR 1/8" PIPE PLUG CENTERED AT REAR OVER VALVE . IMPOR TANT-ALL EXTERNAL OIL LINES AND FI T TINGS SHOULD HAVE MINIMUM INSIDE DIAME TER OF 13/32 INCH. COOLER MUST WHICH WILL INSURE IT IS FILLED PERMI T FREE FLOW OF FLUID FROM REGULATOR VALVE. REGULATOR VALVEEXHAUSTS TO SUMP WHEN PUMP PRESSURE EXCEEDS APPROXIMATELY 200 P.S.I. FORWARD CLUTCH FEED DOES NOT HAVE AN EXTERNAL TAP FOR CHECKING PRESSURE. WHEN SELECTOR IS IN "F" POSITION, LINE PRESSURE INDICATES CLUTCH PRESSURE. PRESSURE DROP FROM "N" TO "F" INDICATES LEAK AGE IN FORWARD CLUTCH CIRCUI T. SCREEN INSTALL COOLER IN A POSITION WITH OIL AT ALL TIMES, AND WILL NOT DRAIN BACK TO SUMP. COOLER RETURN TO SUMP 12669C Figure 5. Hydraulic Circuit Schematic (Model 72C Direct-Drive Shown) • 3 INSPECTION A. GENERAL. B. SCHEDULED INSPECTIONS (See Table 2). The transmission, cooler, cooler lines, and conThe following recommended inspection intervals trol linkage should be inspected at regular interare based on normal operating conditions. Intervals. Regular inspections will ensure proper vals should be adjusted for extremes of temperaoperation and help detect minor problems that ture or other adverse operating conditions. can be corrected before they cause a transmission failure. Table 2. Scheduled Inspections i' I! INSPECTION INTERVAL INSPECTION TASK WEE KLY PERIODIC 1 month or 1 00 hours, whichever comes first SAFETY Annual or1000 hours, whichever comes first GEN ERAL WARNING: FAILURE TO PERFORM THESE INSPECTIONS AT REQUIRED INTERVALS CAN RESULT IN INJURY TO PERSONNEL. Inspect control linkage and shift lever for operation. There should be no sticking, binding, or looseness. OIL COOLER AND LIN ES CAUTIO N: Fa il ure to perform these inspections at required intervals can result in transmission failure. Inspect cooler for signs of leakage, damage, or loose mounting bolts. Inspect all connection points for signs of leakage. X X X X X X Table 2. Scheduled Inspections (Continued) • INSPECTION INTERVAL INSPECTION TASK WEEKLY PERIODIC 1 month or 1 00 hours, whichever comes first SAFETY Annual or1000 hours, whichever comes first TRANSMISSION Inspect for damage or signs of leakage around housing and/or bolts. . CAUTION: If oil is discolored or has been overheated (abo ve 190°F) it must be replaced. Remove dipstick. Check oil for signs of water or other contaminants. Check (smell) oil for signs of burnt oil (overheating). If found, replace fluid. See Maintenance. Inspect breather. Check for movement of cap. If no movement replace breather. Check mounting bolts for tightness. If loose, tighten to torque specified in OEM manual. X X X X • • 5 MAINTENANCE A. GENERAL Maintenance to the transmission will normally consist of the following items. • Checking oil level or changing oil. Regular scheduled oil changes are an important part of transmission maintenance. WARNING: SHIFT LINKAGE MUST BE ADJUSTED FOR PROPER OPER ATION OF TRANSMISSION. NOTE: For details on each of these adjustments refer to the OEM manual. • Checking pressure in each circuit (if a problem is detected). CAUTION: Transmission mounting bolts should be checked and tightened to torque specified in OEM manual. Do not overtighten! Damage to the transmission can result. B. LUBRICATION. Due to the various installation angles and oil cooler set-ups, it may be necessary to adjust your oil level. WARNING: DO NOT REMOVE DIPSTICK WITH ENGINE RUNNING. HOT OIL CAN CAUSE BURNS. CAUTION: Clean around the area of the dipstick, before removing. Small particles of dirt can cause damage to internal components and cause valves to stick. Check Oil Level. The transmission should be at operating temperture (190° max.) to get an accurate oil level reading. Oil will expand when it is heated. Oil will drain back from the cooler. Expansion and drainback can significantly affect oil level. Warm Oil Level Check. When the transmission is at operating temperature, place selector lever in neutral. Shut off engine. Carefully remove transmission dipstick. Immediately insert clean dipstick and read oil level. NOTE: Oil level must be checked immediately after engine shut-down to prevent an incorrect reading. Oil drains back into transmission from the cooler and cooler lines. Add or remove oil if necessary. Repeat the above checking procedure as required until oil is at the dipstick mark. Cold Oil Level Check. For ease of checking the oil prior to engine startup, a cold oil level mark can be made. To find the cold oil level mark, the oil level must first be set according to the warm oil level checking procedure. Then, let the boat sit overnight. Insert clean dipstick and read oil level. Put a mark on the dipstick at the cold oil level reading. You can use the new mark to check the oil level when cold. If oil level adjustment is needed, add oil to the new mark. Type of Oil. • Check oil for signs of metal or rubber particles. Dextron II, or any hydraulic fluid which meets the C-4 oil specification is acceptable. Do not mix different brands. If engine doesn't exceed 3,000 R.P.M., a premium SAE 30, API-CD engine oil is acceptable. SAE 40 and . multiviscosity oils are not recommended. If the transmission oil temperature has exceeded 190° F or the alarm sounds, the oil must be changed in the transmission and cooler system. Changing Oil. Oil in transmission, cooler, and cooler lines should be changed after every 1 ,000 hours of operation or annually. Severe service conditions or high operating temperatures may require more frequent changes. • Place selector lever in neutral. Run engine for five minutes at 1500 RPM. Shut down engine. CAUTION: Clean around the area of drain plug, before removing. Small particles of dirt can cause damage to internal components and cause valves to stick. • Drain oil from transmission, cooler, and cooler lines into a suitable container . CAUTION: A few small metal particles are normal. However, if large metal chips or a large number of particles are found, this could be an early sign of transmission failure. The transmission should be disassembled and inspected for internal damage. NOTE: Particles of rubber can indicate cooler line wear. Each line should be inspected for cracks or fraying and should be replaced if damaged. • Fill transmission with new oil. NOTE: The amount of oil required will vary based on length of cooler lines. Use an amount equal to about three-fourths the quantity removed. • Install dipstick. Run engine for two minutes to fill cooler and cooler lines with oil. Set oil level according to procedure at start of section 8, Lubrication. • 7 TROUBLESHOOTING A. GENERAL Before troubleshooting the transmission, do the following. • Check oil level and condition of oil. See Maintenance section for details. • Check transmission, oil cooler and oil cooler lines for physical damage or leakage. Correct any problem. • Check that engine, damper plate, or drive train alignment are not causing the problem. Refer to OEM manual or Velvet-Drive Installation Manual (Form No. 1131) for drive train alignment requirements. Perform all pressure checks at normal operating temperature. Refer to Specification section for details. Pressure gauges used should have a range of 0-200 or 0-300 psi. They must be accurate. B. GUIDELINES. When troubleshooting, shift into each selector position to determine when noise or problem occurs. Determine which parts are moving. This will help pinpoint the cause. Use the following information as a guide to common problems. Damper Plate. Some transmission problems are damper plate related. Check and/or replace damper plate when the following problem occurs. • Transmission "knocks" at idle or low RPM, then stops at 1 ,000 RPM or higher. If the damper plate springs are too soft the sides of the windows will wear. If the springs are too hard the splines will wear. Consult engine OEM for correct damper plate recommended. Clutches. Check and/or replace clutches if the following problem occurs. • Excessive engine RPM (over the rated RPM). This can indicate a slipping clutch. The slipping clutch will usually squeal. WARNING: DO NOT OPERATE TRANSMISSION IF THE FOLLOWING CONDITION IS SUSPECTED. FAILURE TO COMPLY CAN RESULT IN PERSONAL INJURY BECAUSE TRANSMISSION CAN NOT BE DISENGAGED. The slipping clutch will normally overheat. This can result in warped plates. In severe overheating plates can weld together. This will cause a tie up condition in transmission when the other clutch is applied. 8 Table 3. Troubleshooting PROBLEM • LEAKS: 1. At pump or output shaft seal. 2. Between seal and bore. 3. At gasket(s). 4. Loss of oil with no trace of missing oil. 5. Oil out of breather. CAUSE CORRECTION Faulty seal. Replace. Misalignment. Correct. Rough shaft. Replace. Rough housing bore. Replace seal. Loose bolts. Torque bolts properly. Defective gaskets. Replace gaskets. Face(s) not flat. Replace defective parts. Oil leaking from cooler or cooler Replace cooler, or cooler lines lines. that are defective. Oil has been overheated. Replace oil. (Lost anti-foam additive) Correct oil level. High or low oil level. Change oil. Water in oil. • • MALFUNCTION IN BOTH FORWARD AND REVERSE: 1. Low oil pressure. Regulator valve jammed. Internal leakage. Low oil level. Pump defective. 2. No oil pressure. Regulator valve jammed. Internal leakage. Pump defective. No oil. Pump incorrectly indexed. 3. High oil temperature. Regulator valve jammed. Cooler line defective. Oil cooler too small. • Restrictions in cooler lines or cooler. Clean and polish. Replace defective sealing rings. Add oil. Replace pump. Clean and polish. Replace defective parts. Replace pump. Add oil. Rotate pump to correct position. Clean and polish. Replace cooler line. Install larger cooler . Back flush to remove restrictions. 9 Table 3. Troubleshooting (Continued) ' t! II ·' ' :! il' II iI ' , , I ; , I!, , 1 i PROBLEM CAUSE CORRECTION MALFUNCTION IN BOTH FORWARD AND REVERSE: (Cont.) 3. High oil temperature. 4. No power, noise. 5. No line pressure. 6. Noisy in Forward and Reverse. Defective cooler. Defective temperature sensor. Broken gear teeth -gears not meshed. Heavy weight oil (90 weight). Pump Incorrectly indexed. Oil inlet shield or screen blocked. Misalignment of damper plate with engine, or misalignment of output shaft components. Damaged gears. Replace cooler. Replace sensor. Replace defective parts. Remove and use proper weight oil. Rotate pump to correct position. Inspect and clean. Align drive train components. Replace damaged gears. MALFUNCTION IN FORWARD OR REVERSE: 1. Clutch drags or does not release. 2. Clutch does not apply. 3. Harsh engagement. 4. Soft engagement. 5. Won't move or sluggish. Warped clutch plate. Mechanical failure. Tight pack clearance. Low pressure. Defective parts. High pressure -valve sticking. Engine idle too fast. Linkage binding or misadjusted. Low pressure. Forward clutch seized. Worn or broken sealing rings. Replace defective parts. Replace defective parts. Increase clearance to specification. See low oil pressure. Replace defective parts. Clean and polish regulator valve. Adjust engine idle. Repair as required and adjust to OEM spec. See low oil pressure. Replace defective parts. Replace defective parts. Table 3. Troubleshooting (Continued) • .. PROBLEM CAUSE CORRECTION MISCELLANEOUS PROBLEMS: 1. Hydraulic noise or buzz. 2. Gear noise in forward. 3. Gear noise in reverse. Low oil level, or air in hydraulic circuit. Regulator valve sticking. Broken, pitted, or cracked gear teeth. Broken, pitted, or cracked gear teeth. Check oil level and fill if low. Operate engine in neutral at 1200 RPM to remove air. Clean and polish. Replace defective parts. Replace defective parts. MALFUNCTION IN NEUTRAL: 1. Drives in forward direction. 2. Drives in reverse direction. 3. Noisy in neutral only. 4. Transmission overheating. Broken sealing rings or bushings. Warped forward clutch plates or mechanical failure of clutch. Exhaust blocked in control valve. Warped reverse clutch plates or mechanical failure of clutch . Exhaust blocked in control valve. Low oil pressure. Pump gears worn. Oil level low. Oil level low. Cooler too small or restricted lines. Pump pressure low -worn or damaged pump. Clutches slipping . Internal leakage bypassing cooler. Temperature sensor defective. Incorrect type of oil. Regulator valve sticking. Replace defective parts. Replace defective parts. Clean control valve. Replace defective parts. Clean control valve. Replace pump assembly. Add oil. Add oil. All external oil lines should have minimum inside diameter of 13/32". Cooler must permit free flow of oil. Check pressures. If low, inspect pump. If worn or damaged, replace. Check sealing rings. Replace if damaged. Locate and fix leak. Replace sensor. Drain, flush and replace with correct type of oil. Clean and polish. • 11 11 . ; OVERHAUL A. GENERAL. Before removal and disassembly, review the following procedures. Use the proper hand tools, slings, or hoists for the job. WARNING: KEEP WORK AREA, TOOLS, AND TRANSMISSION CLEAN. WIPE UP ANY SPILLED TRANSMISSION FLUID TO PREVENT ACCIDENTS. AS REQUIRED, WEAR SAFETY GLASSES, SAFETY SHOES AND A HARD HAT TO PREVENT PERSONAL INJURY. B. DISASSEMBLY. NOTE: Read OEM Vehicle manual for specific removal instructions. Before starting disassembly, review the exploded-view shown in Figure 8. The transmission can be disassembled following the index numbers shown in Figure 8. Seals. Remove 0-rings, sealing rings, and oil seals carefully to prevent damage if they must be reused. It is best to replace these items. Bearings. Do not remove bearings unless replacement is required, or cleaning can not be done properly. • Keep matched parts or sets together. Do not reverse or mix them. C. CLEANING. WARNING: CLEANING SOLVENTS CAN BE TOXIC, FLAMMABLE, AN IRRITANT TO THE SKIN, OR GIVE OFF HARMFUL FUMES. AVOID PROLONGED CONTACT, INHALATION OF VAPORS, OR SMOKING. FAILURE TO COMPLY CAN RESULT IN INJURY OR DEATH TO PERSONS. • Rinse all metal parts in solvent to remove dirt, grease, and transmission fluid. • Take special care to remove solvent from all parts. • Air dry clutch plates. • If 0-rings are to be reused, air dry them. D. INSPECTION. Case. Inspect for cracks. Check sealing surfaces for nicks, scratches, or burrs that can cause leaks. Inspect output shaft bore for signs of wear on one side. This can indicate misalignment of prop shaft. Gears. Inspect for unusual wear patterns, chipped, cracked, or broken teeth. Bearings. Inspect for chips, cracks, galling, or missing bearings. Check for signs of overheating. Threaded Parts. Inspect for stripped, damaged threads, or burrs. Springs. Inspect for distortion, cracks, or other damage. Check springs against dimensions in Specification section. E. REPAIR. • Remove scratches, burrs, or minor surface defects with very fine emery cloth. • Threaded holes can be retapped using the same size tap. Do not make the hole oversize. • Repair or replace all damaged parts. 12 FORWARD & REVERSE GEAR TRANSMISSION CASE 3/64" SHOWN. 71 -28C • • F. ASSEMBLY. CAUTION: Threaded plugs, screws, bolts, and coupling nuts must be tigtened to the torques shown in Table 4 to prevent premature failure of transmission. • A new coupling nut must be used at assembly. • Prior to assembly, dip or coat internal parts with transmission fluid. Let excess fluid drain off. • Use a light coat of vasoline to position or hold a gasket, 0-ring, or small part for assembly. Apply to sealing rings before assembly. • Inspect assemblies pressed together for proper fit and position. • Check that each snap ring is fully engaged in groove. • Threaded plugs, screws, and bolts should be tightened to the torques shown in Table 4. NOTE: The following procedures are correct for most transmissions. Minor differences may be found on some models. • Assemble the transmission using the following procedures. If a reduction unit is mounted to the transmission, refer to the correct section at the back of this manual for assembly procedures. CAUTION: Transmissions manufactured prior to September 1978 used bushings instead of sealing rings. If bushings were in case they must be installed before assembly of transmission. See Figure 6 for details. '"' • HOLES IN BUSHING MUST REGISTER WITH HOLES IN CASE AS SHOWN. -EACH BUSHING TO BE ASSEMBLED IN CASE BORE TO DIMENSIONS NOTE: THE 71 -28C BUSHING IS THE PRE-SIZED BUSHING FOR FIELD SERVICE OF THE ORIGINAL 71-28B BUSHING INSTALLED AT FACTORY. 1276 !5 A Figure 6. Bushing Installation 13 STEP 1. If removed, install the following parts in case (98). Tighten threaded parts to torque shown in Table 4. Press bearing (7) into back of case (98). Apply loctite #92, or equivalent, to threads of pipe plugs (96 and 97) and thread into top of case (98). Apply loctite #592, or equivalent, to threads of dipstick tube (18) and thread into side of case (98). NOTE: Plug (88) is a plastic shipping plug and should be installed hand-tight. STEP 2. Install shield (92) in case (98) with slot facing bottom of case (98). Install washer (91) and spring (90) inside shield (92). Apply loctite #92, or equivalent, to threads of bushing (89). Thread bushing (89) into side of case (98) and tighten to torque shown in Table 4. NOTE: Plug (88) is a plastic shipping plug and should be installed hand-tight. STEP 3. Install baffle (87) in case (98). Place thrustwasher (86) on face of bearing bore. Notch in thrustwasher (86) must align with notch in case (98). CAUTION: Thrustwasher is used only on some models. (See Model Chart 71C and 72C Transmissions.) Difficulty may be encountered when installing the oil baffle into some transmission cases. To overcome this, it may be necessary to trim the baffle as described below. The 2 baffles used are similar with the exception of length. 1017-036-002 is used in 71 C models and is 3 3/8 inches long. 1018-036-002 is used in 72C models and is 4 inches long. BEARING GROOVE IN BEARING MUST FACE AWAY FROM CASE 12648A Case Assembly 1 CASE DRVSEAL OIL INLET SHIELD SPRING 12649A Oil Shield Assembly 12650A NEW STYLE BAFFLE Installation is made easier Installation is made easier on 71 C Models by trimming on 72C Direct Drive Models the two ears as shown in by trimming one of the ears Figure #1. as shown in Figure #2. 14 STEP 4. Lubricate sealing rings (83) and bush ings (84) with vasoline. • • If removed, press bushings (84) into pinion car rier (85). SEALING RINGS 12666A Pinion Carrier Assembly SEE DETAIL "C" RING GEAR REACTION PLATE FIGURE "A" DETAIL "C" STEEL PRESSURE PLATE DRAIN HOLES (3) 11829A CLUTCH PLATE 11830A CAUTION: Do not block pressure holes in pinion carrier (85) with bushings (84). Install sealing rings (83) in grooves of pinion carrier (85). Compress each sealing ring (83) until it locks in place. Install pinion carrier (85) in case (98). STEP 5. Install pressure plate (74) in ring (76). Late production ring gears for 72C transmissions have 3 large oil drain holes 120° apart. Early production ring gears have 4 small 3/16 holes goo apart. Either ring gear can be used successfully in marine applications. • STEP 6. Starting with a friction clutch plate (73), alternately stack friction clutch plates (73) and steel clutch plates {72). Friction clutch plates are now designed with 3 missing teeth 120° apart. When installed in a late designed ring gear, they should be installed with the missing teeth aligned with the 3 large drain holes as shown in detail "C". Early and late friction plates can be mixed indiscriminately when installed in an early 72C • ring gear or in any 71 C ring gear. Forward Clutch Pack Arrangement FIGURE "B" 15 STEP 7. Install clutch plates (72 and 73) and PRESSURE pressure plate (71) in ring gear (76). PLATE STEP 8. Install snap ring (70) in ring gear (76) . CAUTION: Several different snap rings are used to assemble the clutch group. They have different thicknesses. Be sure the correct snap ring is used. STEP 9. Lubricate 0-ring (66) lightly with vasaline and install in groove of forward clutch cylinder (64). 11831A Forward Clutch Pack Assembly PRESSURE PLATE 11832A Snap Ring Installation FORWARD CLUTCH CYLINDER 11833A 0-Ring Installation STEP 10. Lubricate clutch spring bearing ring (68) and piston sealing ring (67) with vasoline. Install clutch spring bearing ring (68) in groove on • piston (65) face. Install piston sealing ring (67) in outer groove of piston (65). NOTE: Check that piston sealing ring (67) is not twisted, cut, or deformed. Replace if damaged. PISTON SEALING RING 12651A Clutch Rings Installation STEP 11. Install piston (65) in forward clutch cylinder (64). FORWARD CLUTCH CYLINDER 11835A • STEP 12. Place clutch belleville (dish) spring (69) inside rim of forward clutch cylinder (64). Spring is dished. The inside of the spring should be lower than the outside. Piston Installation CLUTCH BELLEVILLE SPRING (DISHED) FORWARD CLUTCH CYLINDER 11836A Clutch Spring Assembly • 17 STEP 13. Install ring gear (76) over forward clutch cylinder (64), with piston (65) and spring (69)facing up. Press ring gear (76) down over forward clutch cylinder (64). CAUTION: Check to see that clutch spring bearing ring (68) is still seated in the groove of clutch piston (65). STEP 14. Remove clutch assembly from press. Install snap ring (60) in groove of ring gear (76}. CAUTION: Several different snap rings are used to assemble the clutch group. They have different thicknesses. Be sure the correct snap ring is used. STEP 15. Place ring gear (76) in press with external splines facing down. Assembly tool should support the ring gear (76) only. The forward clutch cylinder (64) should not be touching the assembly tool. Press forward clutch cylinder (74) against snap ring (60). Remove clutch assembly from press. FORWARD CLUTCH CYLINDER 12652A Forward Clutch Cylinder Installation EXTERNAL SPLINES 11838A Snap Ring Installation RIM OF CLUTCH CYLINDER 11837A Compressing Clutch Pack 18 • • STEP 16. Push down, by hand, on clutch plates. Measure snap ring gap. Select proper thickness snap ring (75) or combination of snap rings (75) to set clutch pack clearance. Refer to chart be low. More than one snap ring may be required. Clearance for bronze pack (71 C)-0.018"-0.053" Clearance for bronze pack (72C)-0.035"-0.055" Clearance for paper pack (71C)-0.018"-0.053" Clearance for paper pack (72C)-0.021"-0.046" PART SNAP RING THICKNESS NUMBER in. mm 1 0-00-1 39-048 1 0-00-1 39-049 4768 1 0-00-1 39-01 8 4768A 47688 .033-.037 .050-.054 .050-.054 .062-.066 .074-.078 .096-. 100 .84-.94 1.27-1 .37 1.3-1 .4 1.6-1 .7 1.9-2.0 2.4-2.5 STEP 17. Install selected snap ring(s) (75) in groove of ring gear (76). STEP 18. If removed, install woodruff key (81) in drive gear assembly (82). Slide forward clutch hub (80) on drive gear assembly (82) and align with woodruff key (81 ). Press forward clutch hub (80) on drive gear assembly (82) and against shoulder. Install snap ring (79) in groove of drive gear assembly (82). Lubricate sealing rings (78) with vasoline and install in grooves of drive gear assembly (82). RING GEAR 11840A Snap Ring Selection SNAP RING RING GEAR 11841A Snap Ring Assembly FORWARD CLUTCH HUB DRIVE GEAR ASSEMBLY 12635A Sealing Ring Installation • Compress each sealing ring (78) until it locks in place. 19 STEP 19. Install drive gear assembly (82) in clutch assembly. Slide bearing (63) down drive gear assembly (82). Place complete assembly in press. Press bearing (63) into drive gear assembly (82) until seated against shoulder. STEP 20. Install snap rings (61 and 62) in grooves of drive gear assembly (82) and forward clutch cylinder (64). STEP 21 . Apply vasoline to bronze thrustwasher (77). Install over end of shaft and against face of gear. RING GEAR Bearing Installation SNAP RINGS RING GEAR 11844A Snap Ring Installation Thrustwasher Assembly 20 STEP 22. Install clutch and drive gear assembly (82) in case (98). Rotate clutch and drive gear assembly (82) back and forth to engage ring gear teeth with pinion gear teeth. CASE DRIVE GEAR ASSEMBLY Clutch and Drive Gear Installation Thrustwasher Installation STEP 23. If original case and clutch cylinder are used, install thrustwasher (59) on face of clutch cylinder. On model 10-18 transmissions select new thrustwasher (59) as follows: Position case vertically as shown. Measure from face of case (98), without gasket (49), to face of clutch cylinder. • • When dimension is 0.433 inch (11.0 mm) or less, use 71-158 thrustwasher. When dimension is greater than 0.433 inch (11.0 mm), use 10-16-193-001 thrustwasher. Friction Plate Installation STEP 24. Install one bronze reverse clutch friction plate (56) in case (98) . • 21 -----""'.. Y"" STEP 25. Install three dowel pins (58) and eleven pressure plate springs (57) in case (98) . Measure the depth of the pin cavity shown to determine the proper pin to use. A Use Pin Number .646 71-87 12655A .782 71.87 Spring and Dowel Pin Installation .857 R6-177 .911 71.87 1.074 4622E 1.200 1 000-043-031 STEP 26. Install one steel separator plate (55) in case (98) with large part of tab to left of dowel pin (58). Alternately stack remaining reverse clutch friction plates (56) and steel separator plates (55) in case (98). *SEE PAGE 34. Reverse Clutch Pack Installation STEP 27. Install reverse clutch pressure plate (54) in case (98) with three half moons aligned with dowel pins (58). Be sure all springs are seated in their holes. V-NOTCH HERE 12657A Pressure Plate Installation 22 • .. STEP 28. Lubricate sealing ring (52) with vasaline and install in groove of reverse clutch piston {51) . NOTE: Be sure sealing ring (52) is not twisted, cut or distorted. Replace if damaged. STEP 29. If removed, press needle bearing (48) into adapter (45). Needle bearing must be installed flush (even) with back face of adapter (45). Lubricate 0-ring (53) with vasoline and install in groove of adapter (45). NOTE: Be sure 0-ring (52) is not twisted, cut, or distorted. Replace if damaged. If removed, install dryseal plug (50) in adapter (45). Lightly coat gasket (49) with vasoline and place on adapter (45). 11852A Sealing Ring Assembly FORWARD AND REVERSE ADAPTER 12638A Sealing Ring Installation STEP 30. Install reverse clutch piston (51) in adapter (45). FORWARD AND REVERSE REVERSE CLUTCH PISTON 12639A Reverse Clutch Piston Assembly • 23 STEP 31 . Install adapter (45) on case (98) and align bolt holes. Thread four capscrews (46) into case (98). Tighten in a criss-cross pattern to final torque specified in Table 4. Lightly tap woodruff key (44) into place in drive gear (82) with a soft-faced mallet. STEP 32. Press oil seal (42) into pump body. CAUTION: Oil seal must be installed dry. Lubricants can damage rubber coating. I, STEP 33. Install driven gear in pump body. NOTE: Pump gear should be installed the same side down as removed. FORWARD AND REVERSE ADAPTER 12641A Adapter Installation OIL SEAL 12658A Oil Seal Installation DRIVEN GEAR WEDGE 12659A Pump Driven Gear Assembly 24 • • STEP 34. Lubricate pump gasket (43) with vasaline and install in groove of adapter (47). Install pump drive gear onto input shaft (82). Check that pump drive gear locates freely on woodruff key (44) and shaft (82). STEP 35. Install pump assembly (40) on top of adapter (47) and align bolt holes. CAUTION: Position pump housing with cast arrow at top pointing in the same direction as engine rotation. Thread four bolts (41) into adapter (47). Tighten in a criss-cross pattern to final torque specified in Table 4 . STEP 36. Assemble control valve assembly (33). Refer to Figure 6. Lubricate 0-ring (38) with vasoline and install on end of valve assembly (33). NOTE: Gap in snap ring must be aligned with notch in control valve. Pump Gasket Installation Pump Assembly Installation 0-RING CONTROL i VALVE REGULATOR VALVE VALVE SPRING SPRING RE TAINER 12693A Valve Assembly • STEP 37. Lubricate control valve O.D. Slide control valve assembly (33) into side of case (98). STEP 38. Install switch cam (31) on end of valve assembly (33). Be sure tab on switch cam (31) sets in notch of valve assembly (33). STEP 39. Install valve cover (28) as follows: Position gasket (31) on case (98). Place valve cover (28) over gasket (32) and align bolt holes. Thread three bolts (29) and lockwashers (30) into case (98). Tighten bolts in a criss-cross pattern to final torque specified in Table 4. If removed, lubricate 0-ring (27) with vasoline and install in groove of neutral switch (26). Thread neutral switch assembly (25) into valve cover (28) and tighten to torque specified in Table 4. CASE CONTROL VAL VE ASSEMBLY NOTCH ALIGNED WITH THIS BOLT HOL E Valve Assembly Installation SWITCH CAM TAB NOTCH Switch Cam Installation VAL VE COVER Valve Cover Installation 26 STEP 40. Install shift lever (19) as follows: Lubricate poppet spring (24) and hole in case (98) with grease, shell alvania #2 or equivalent. Place poppet spring (24) and steel ball (23) in case (98). Slide shift lever (19) over end of control valve assembly (33) and against steel ball (23). Rotate shift lever (19) to engage steel ball (23) in hole of shift lever (19). SHIFT LEVER -( POPPET SPRING LOCKWASHER FLATWASHER 12640A • , -· ... , Hold shift lever (19) against steel ball (23). Install washers (21 and 22) and thread nut (20) on control valve assembly (33). Tighten nut (20) to torque specified in Table 4. STEP 41 . Install bearing retainer (3) as follows: If removed, press oil seal (6) into bearing retainer (3). CAUTION: Oil Seal must be installed dry. Lubricants can damage rubber coating. Install gasket (8) and bearing retainer (3) on back of case (98). Thread bolts (4) and lockwashers (5) into case (98). Tighten bolts (4), in a criss-cross pattern, to torque shown in Table 4. STEP 42. Slide coupling (2) on output shaft. Thread nut (1) on output shaft. Tighten nut (1) to torque shown in Table 4 . Shift Lever Assembly GASKET I BOLT Bearing Retainer 12645A Coupling Installation • STEP 43. Install dipstick (17} in side of case (98). Turn handle until snug. Do not overtighten. NOTE: For assembly of reduction units refer to the sections in the back of this manual. 12663A Dipstick Installation INSTALLATION CAUTION: After a transmission failure the cooler and cooler lines must be flushed to remove contaminated hydraulic fluid and metal/rubber particles. Failure to comply can result in premature wear or failure of overhauled transmission. • Align input shaft spline with damper plate. • Assemble transmission to engine, and then install bolts. Do not use bolts to draw transmission ·-·"' WARNING: CHECK THE SHIFT ·.; LEVER AT THE HELM TO SEE THAT ·. · J J FORWARD POSITION IS ALSO FORWARD POSITION AT THE TRANSMISSION SHIFT LEVER. (TRANSMISSION SHOULD NOT BE RUNNING IN REVERSE WHEN BOAT IS GOING FORWARD.) • Adjust the shift cable so the holes in the shift lever are centered over the. detent ball at each tl1 selector location. See Figure 7 A. ' • Read OEM manual for complete installation instructions. Installation literature is available from Borg-Warner Automotive-Transmission Systems. Request Form No. 1131. • Connect oil line to oil to the cooler outlet. See Figure 78. DETENT BALL CENTEREQIN HOLE 12714A Figure 7 A. Shift Cable Adjustment BREAT HER MAINLINE PRESSURE TAP RE VERSE CLU TCH.. PRESSURE TAP SHIPPING PLUG I 12785A Figure 7B. Oil to Cooler Outlet 28 .// 75 74 12718C USED ON SOME 10-17 TRANSMISSIONS 89 93 Figure 8. 71 C and 72C Transmission Assembly • Production : - . ' • ·} :.;-.. r.. INDEX NO . PART NUMBER DESCRIPTION QTY 39 71 -244A • • CONTROL VALVE 1 40 71 C-A60 • PUMP ASSEMBLY 1 41 42 1 0-00-1 83-021 I 1 0-00-044-0 14 • HEX HEAD BOLT (5/16-18 x 1-3/a) • • OIL SEAL 4 1 43 3-61 • PUMP GASKET 1 44 4873 • WOODRUFF KEY 1 45 71 C-A8 • FORWARD AND REVERSE ADAPTER ASSEMBLY 1 46 47 491 1 NO NUMBER • C..PSCREW (3/a-16 X 1-1/4) • • FORWARD AND REVERSE ADAPTER (NSS) 4 1 48 49 4840D 71 -144B • • NEEDLE BEARING • GASKET 1 1 50 0000444858 • PIPE PLUG (1/4) 1 51 71 -35 • REVERSE CLUTCH PISTON 1 52 4805A • CLUTCH SEALING RING 1 53 54 / 4804G 71 -71 • 0-RING • REVERSE CLUTCH PRESSURE PLATE 1 1 55 ' 72-1 76 • STEEL CLUTCH PLATE * 0-2 56 / 57 72-A66B 71 ..7 • FRICTION CLUTCH PLATE • PRESSURE PLATE SPRING * 1-3 11 58 71-87A • DOWEL PIN C312 DIA x .438 LONG) 3 58 A R6-177 • DOWEL PIN P12 DIA x .621 LONG) 3 58B 4622E • DOWEL PIN (.312 DIA x .875 LONG) 3 58C 1 0-00-043-031 • DOWEL PIN (.312 DIA X 1.000 LONG) 3 59 71 -1 5B • THRUSTWASHER 1 59 A 10-16-1 93-001 • THRUSTWASHER 1 60 4822 • SNAP RING 1 61 RBA-?1/2 • SNAP RING (10-1 7 ONLY) 1 61A 4766BJ • SNAP RING (10..18 ONLY) 1 62 4734. • SNAP RING (1.0-1 7 ONLY) 1 62A 4559A • SNAP RING (10-1 8 ONLY) 1 63 1 0-00-130-01 7 • BEARING (10-1 7 0NLY) 1 63A 10-00-130-016 • BEARING 1 64 71 -70 • FORWARD CYLINDER (1 0-1 7 ONLY) 1 64A 65 72-70 10-1 6-124-001 • :FORWARD CYLINDER (1 0-18 ONLY) ·.· .,. FORWARD PISTON 1:'...1 65A 71 -45 ..:t=ORWARD CLUTCH PISTON 1 66 5M-122 • 0-RING 1 67 5L-36 • PISTON SEALING RING 1 68 5C-33 • CLUTCH SPRING BEARING RING 1 69 3-37 • CLUTCH BELLEVILLE SPRING 1 70 4755. • SNAP RING 1 71 5C-1,75A • CLUTCH PRESSURE PLATE 1 72 3-1 76 • STEEL CLUTCH PLATE (10-1 7 ONLY) ... ·;·..f 4 72A 73 3-176 5C-A66A • STEEL CLUTCH PLATE (1 0-18 ONLY) • FRICTION CLUTCH PLATE (1 0-1 7 0NLY) 6 5 73A 7475 5C-A66A 5L-67 1 0-00-1 39-048 • FRICTION CLUTCH PLATE (1 0-18 ONLY) • CLUTCH PRESSURE PLATE. • SNAP RING (.033-.037 THICK) (10-1 7 ONLY) (Yellow) 7 1 1 75A 1 0-00-1 39-049 • SNAP RING {.050-.054 THICK) (1 0-17 ONLY) (Pink) 1 75B 4768 • SNAP RING (.050-.054 THICK) (1 0-18 ONLY) (Green) 1-2 75C 4768A • SNAP RING (.074-.078 THICK) (10-18 ONLY) (Orange) 1 75D 4768B • SNAP RING (.096-.100 THICK) (1 0-18 ONLY) (White) 1 75E 10-00-1 39-018 • SNAP RING (.062-.066 THICK) (10-18 ONLY) (Purple) 1 . . . NSS -NOT SERVICED SEPARATELY, BUY NEXT HIGHER ASSEMBLY. , · * SEE CHART ON PAGE 34 TO DETERMINE PROPER AMOUNT. L.. . ,-. 31 INDEX PART DESCRIPTION QTY NO. NUMBER 76 71-6 • RING GEAR (10-17 ONLY) 76A 72-6 • RING GEAR (10-18 ONLY) 77 71-17 • THRUSTWASHER 1 78 4806J • SEALING RING 2 4495 • SNAP RING 71 -40 • FORWARD CLUTCH HUB (10-17 ONLY) BOA 1 0-16-179-001 81 0000218211 81 A 00001 24553 82 71C-3A16 82A 72C-2A1 6 83 4806B 84 A4867DD (Kil) 85 . 1 0-17-659-* * * 85A 1 0-18-659-* * * 86 71-159 86A 10-17-193-001 87 1 0-17-036-002 87A 1 0-18-036-001 88 1 0-00-191-002 89 4885B 90 5L-222 91 35-143 92 1 0-00-238-002 • FORWARD CLUTCH HUB (10-18 ONLY) • WOODRUFF KEY (10-17 ONLY) • WOODRUFF KEY (10-18 ONLY) • DRIVE GEAR ASSEMBLY (10-17 ONLY) • DRIVE GEAR ASSEMBLY (10-18 ONLY) . • SEALING RING • BUSHING • PINION CARRIER ASSEMBLY (10-17 ONLY) • PINION CARRIER ASSEMBLY (10-18 ONLY) • THRUSTWASHER (USE W/BUSHING STYLE CASE) • THRUSTWASHER (USE W/SEALING RING STYLE CASE) • Oil BAFFLE (USED ON 71 C) • OIL' BAFFLE (USED ON 72C) • PLUG (3/a-18) • DRYSEAL BUSHING (3/4-14) • SPRING • FLAT WASHER • OIL INLET SHIELD 1 4 2 1 1 1 1 1 1 2 1 1 1 1 94 71 C-84 • OIL RETURN TUBE 1 71 C-A98 • OIL STRAINER ASSEMBLY 1 96 A4740G • BREATHER 1 0000444866 • PIPE PLUG (3/a-18) 1 97 0000444687 • PIPE PLUG (1/a-27) 98 10-17-565-* * * • CASE (10-17 ONLY) 98A 1 0-18-565-* * * • CASE (10-18 ONLY) * * * CHECK MODEL CHART PAGE 35 TO DETERMINE CORRECT PART NUMBER NOTE: The following kits are available for the Model 71 C and 72C transmissions. Index numbers shown match the index numbers on the exploded-view, Figure 8. INDEX NO. PART NUMBER DESCRIPTION ·:QTY 7172A 73A74 A4867AB 5C-1 75A 3-1 76 5C-A66A 5L-67 FORWARD CLUTCH PACK KIT (10-1 8 ONLY) • CLUTCH PRESSURE PLATE • STEEL CLUTCH PLATE • FRICTION CLUTCH PLATE • CLUTCH PRESSURE PLATE 1 6 7 1 32 • INDEX NO. PART NUMBER DESCRIPTION QTY 71 72 7374 A4867AE 5C-1 75A 3-176 5C-A66A 5L-67 FORWARD CLUTCH PACK KIT (1 0-1 7 ONLY) " --• CLUTCH PRESSURE PLATE • STEEL CLUTCH PLATE • FRICTION CLUTCH PLATE • CLUTCH PRESSURE PLATE 1 4 5 1 INDEX NO. PART NUMBER DESCRIPTION QTY A4867HA OIL SEAL AND SEALING RING KIT 6 71 C-1 10 • OIL SEAL 1 38 4804H .. • 0-RING 1 42 1 0-00-044-0 14 ... • OIL SEAL 1 43 3-61