New Forward Clutch Assembly

SUBJECT:

New Forward Clutch Assembly
TRANSMISSION APPLICATIONS:

1987 THM 700-R4 (MD8)
TRANSMISSION MODELS:

All Models

Figure 20 - Forward Clutch Assemblies:

Figure 21 - Forward Clutch Components:

Figure 22 - Forward Clutch Backing Plate:

CHANGE TO ASSEMBLY COMPONENTS:

^ New clutch plate stack up for all models (Figures 20 & 21), pages 20 and 21.
- 5 steel plates (649)
- 5 composition plates (649)
- 1 apply plate (646)
- 1 waved steel plate (648)
- 1 selective backing plate (650, Figures 21 & 22)
NOTE: eliminate forward clutch spacer plate (647) and thin apply plate (646)

Figure 23 - Internal Components:

Figure 24 - Forward Clutch Sprag Assembly:

^ New forward clutch sprag assembly (Figures 23 & 24), page 22
- increase of 2 elements (total of 28 elements)
- larger inside diameter of sprag outer race (644)
- larger outside diameter of sprag retainer and race assembly (641)
- new retainer rings (643) for sprag elements

^ New overrun clutch hub (639) due to elimination of:
- sprag assembly wear plate (640)
- thrust washer (input carrier/sprag) (660)
DATE OF CHANGE:

July 17, 1986, Julian Date 198, for all 1987 THM 700-R4 transmission models. All 1987 Service Replacement Transmission Assemblies (SRTA) models have the new forward clutch assembly.


SERVICE ACTION:

Component parts of the new sprag are not serviced separately. When using the new sprag, race, and hub assembly on 1982 through 1986 THM 700-R4 transmissions, the sprag assembly wear plate (640) and input carrier to race thrust washer (660) must be removed and not used.

NOTE: If transmission has auxiliary valve body, solid turbine shaft seals must be used.


SERVICE PARTS INFORMATION:

Part Number Description

8663773 Sprag, Race and Hub Assembly (1987 YAM, YCM, YDM, YMM, YSM, YWM,

YZM, models only)

8663774 Sprag, Race and Hub Assembly (All other 1987 models)