A/T - Oil Pump Production Changes
Number 85-7-4 Date 10/84Subject: NEW OIL PUMP DRIVE SHAFT AND SPACER ASSEMBLY, PUMP SHAFT BEARING AND SEAL ASSEMBLY AND CONTROL VALVE AND PUMP ASSEMBLY
Models Affected: Late 1984 Model and All 1985 Model THM 125/125C Transmissions
Starting in May, 1984, a new oil pump drive shaft and spacer assembly, pump shaft bearing and seal assembly and control valve and pump assembly went into production on all THM 125/125C transmissions built in the United States.
The new parts provide easier and improved assembly procedures.
FIGURE 1 - OIL PUMP DRIVE SHAFT AND SPACER ASSEMBLY:
FIGURE 2 - PUMP SHAFT AND BEARING SEAL ASSEMBLY:
The former parts (Figure 1) are not interchangeable with the new parts (Figure 2) listed above for the following reasons:
1. The new oil pump drive shaft and spacer assembly has a thinner spacer and a longer bearing journal diameter to accommodate the new pump shaft bearing and seal assembly (Figure 2).
2. The new pump shaft bearing and seal assembly was also made longer in length to accommodate the seal as part of the bearing assembly (Figure 2).
3. The new control valve and pump assemblies were changed to accommodate the new oil pump drive shaft and roller pump shaft bearing and seal assemblies.
Refer to Chart 1 (Page 2) for the serial number breakpoints. If the transmission being serviced has a serial number smaller than the number shown in Chart 1, it will have the former parts (refer to the 1984 parts list book). If the number is the same or larger, it will have the new parts (refer to Charts 2 and 3 (Pages 2 and 3) for new part numbers and model applications).
FIGURE 3 - U.S. SERIAL NUMBERS FOR THM 125C TRANSMISSIONS:
FIGURE 4 - JULIAN DATES FOR CANADIAN MODELS:
Important: All THM 125C transmissions built in Canada will have these new parts beginning start of production 1985. Some model THM 125C transmissions built in Canada are also built in the United States and can be distinguished from each other by their nameplates. The U.S. models have serial numbers (Figure 3) and Canadian models have Julian dates (Figure 4).
Note: This change affects only the transmissions built in the United States.
CHART 1
SERIAL NUMBERS STARTING WITH NEW OIL PUMP SHAFT AND SPACER ASSEMBLY, PUMP SHAFT BEARING AND SEAL ASSEMBLY, AND CONTROL VALVE AND PUMP ASSEMBLY
MODEL SERIAL NO.
CA 2921
CB 240974
CC 1787
CE 83327
CF 8695
CT 4840
EF 7651
EI 7493
EK 11230
EL 4824
EM 3343
EQ 14460
EB 3452
EP 2433
MODEL SERIAL NO.
EN 4986
EW 1656
HC 2355
HM 3147
HS 20389
HX 7171
HY 33059
PD 2762
PE 70659
PF 34901
PG 69397
PJ 9033
PW 90895
CHART 2
PART NAME PART NUMBER MODEL
Oil Pump Drive
Shaft and Spacer 8643764 All
Assembly
Pump Shaft
Bearing and 8643762 All
Seal Assembly
CHART 3
NEW CONTROL VALVE BODY ASSEMBLIES STARTING WITH SERIAL NUMBERS SHOWN IN CHART NUMBER 1 (PAGE 2)
Part Number Model
8652251 CE
8652255 CA, CB, CF
8652263 CC, CT
8652412 EB
8652421 EF
8652416 EI
8652410 EK
8643419 EQ
8652417 EL
8652256 EM
8652269 EN
8652415 EP
Part Number Model
8652257 EW
8652262 HC
8652418 HM
8652259 HS
8652414 HX
8652261 HY
8652254 PE, PG
8652265 PD
8652268 PF
8652267 PJ
8652260 PW