BORG WARNER VELVET DRIVE 70C 71C 72C 73C Gearbox Manual

B! lBokLgMhrner. Automotive ,: Transmission Systems

SERVICE MANUAL Price $5.00 UYVR~ltlIC TRAN&WSION DIRECT DRIVE MODEL 70C & 71C SERIES This Service Manual is prepared and illustrated for the ASI-70C and ASI-7lC direct drive transmission, but it also contains supplementary information and illustra- tions which allow it to be used for the servicing of the other earlier model transmissions, ASI-7OF.3, ASI- 7lB, ASI- and ASI-71. Borg-Warner Transmission 5401 Muncie Telephone Automotive, Systems Kilqore lndiana 317 2866100 BorgWarner Inc. Avenue 47304 Telex Automotive 27 491 FORM 1137 / lo-85 PRINTED IN U.S A

TABLE OF CONTENTS INSTALLATION DRAWINGS AND INFORMATION ........................................ .5 CROSS SECTlON ASSEMBLY DRAWlNGS .............................................. .fi EXPLODED VIEWS AND PARTS LISTS ................................................ I2 ClRCULATION DIAGRAM ......................................................... I9 DESCRIPTION..................................................................2 0 lNSTALLATIONPRECAUTIONS.....................................................2 I Transmission oil cooler .......................................................... .2 1 Control lever position........................................................... .2l Front pump mounting .......................................................... ,2 l LUBRICATION RECOMMENDATlONS ................................................. 21 Checking oil level ................................ 1 ............................. .2 I Changing oil ................................................................. .2 1 Transmission fluid ............................................................. .2 1 Oilcapacity..................................................................7 1 TIiANSMISSIONOPERATlON.......................................................2 2 Forward ................................................................. ...2 2 Ncutr:~l.....................................................................~ 2 Revcrsc.....................................................................2 . Frecwhceling ................................................................. 2~ Oilpressures..................................................................2 2 DISASSEMBLY OF TRANSMISSION. ................................................. .24 Oil draining procedure .......................................................... .24 Disassembly ofvalvc and spring asscrnhly from transmission .................................. 24 Removal of front pump assembly ................................................... .24 Removal of adapter and reverse clutch piston ............................................ 35 Removal of thrust washer, reverse clutch pressure plate, pressure plate springs and dowel pins ........... .75 Removal of drive gear and clutch assembly ............................................. .25 Dissssen~hly of forward cluicl~ ..................................................... .2S Removal of pinion cage and output shaft assembly from transmihon case ........................ .25 Removal of rear bearing ......................................................... .26 REASSEMBLYPRECAUTIONS.. .................................................. ..2 6 INSPECTION AND GENERAL INSTRUCTIONS.......................................... .27 ASSEMBLYOFTRANSMlSSlON ................................................... ..2 7 Assembling oil seal in bearing retainer ................................................ .27 Installation of baffle in the transmission case ............................................ .28 Installation of pinion cage and output shaft assembly in the transmission case...................... .28 Assembly of the forward clutch into tl~c ring gear ........................................ .3 I Asscmhly of forward clutch huh and sealing rings on drive gears. .............................. .34 Assemhlillg drive gear and clutch assembly ............................................. .35 Instnllation of drive gear and clutch assembly. reverse clutch plate, and reverse clutch prcssurc plate in transInissiot~ case ............................................................ .30 Assembly of I-everse clutch piston into adapter ........................................... 3X Asscml~ly of adapter and I-CV~I-SC clutch piston onto transmission cast ............................ 3’) Assembly of front pump......................................................... .40 Mounting front pump or1 transmission ................................................ .41 Assembling valve spring assembly ................................................... .4’3 Installation of the valve and spring assembly in the transmission’casc. ........................... .43 Assembly of shili lever .......................................................... .44 Installation of oil strainer assembly and oil drain plug into transmission case. ...................... .45 Installation of miscellaneous transmission parts.......................................... .45

EXTRAEQUIPMENT..............,.....,........................................46 Assembly of neutral switch kit. . . . . . . . . . . . .46 SPECIAL INFORMATION AND INSTRUCTIONS -MODEL 70C AND 7 IC TRANSMISSIONS. . . .47 Installation of oil filler cap and dipstick assembly . . . . . . . . . . . . .47 Installation of oil strainer assembly and oil drain plug into transmission case. .47 Installation of breather assembly . . . . . . . . . . . . . . . . . . . .48 Assembly of front pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 Mounting front pump on transmissiori. . / ,. . . SO Elimination of regulator valve buzz. . . . . . . . . . . . . . . .5 I Drive gear and plug assemblies . . . . . . . . . . .52 Pinion cage and output shaft assembly. . . . . . . . . . . . . . . . . . .52 Forward and reverse gear transmission case and bushing assembly. . . . . . . . .52 SPECIAL INFORMATION AND INSTRUCTIONS - MODEL 70B AND 7 1B TRANSMISSIONS .53 Instailation of breather assembly . . . . . . . . . . . . . . . . .53 Assembly of front pump. . . . . . . . . . . . . . . . . . . .5? Drive gear and plug assembly. . . . . . .53 Assembly of shift lever. . . . . . . . . . . . . . .53 Adapter capscrews. . . . . .54 SPECIAL INFORMATION AND 1NSTRUCTIONS - MODEL 70 AND 71 TRANSMISSIONS . . .S4 Assembly of front pump. . . . . . . . . . . . . . . . . . . .54 Installation of the baffle in the transmission case, .S4 Installation of oil strainer assembly and oil drain plug into transmission case. .55 Cooler return to transmission. . . . . . . . .S5 SERVICE INSTRUCTIONS FOR SERIES lo-17 AND lo-18 TRANSMISSIONS ..56 TKOUBLE SHOOTING Cl IART . . , . . .58 BOLT TORQUE SPEClFlCATlONS. 1.1. . . . . .60 ASSEMBLY TOOL DRAWINGS . . . . .6 1

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BORG WARNER VELVET DRIVE 70C 71C 72C 73C Gearbox Manual

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