New Auxiliary Valve Body Assembly
SUBJECT:New Auxiliary Valve Body Assembly
TRANSMISSION APPLICATIONS:
1987 THM 700-R4 (MD8)
TRANSMISSION MODELS:
All Models
Figure 3 - Auxiliary Valve Body Assembly:
Figure 5 - Valve Body Checkballs:
Figure 6:
Figure 8 - Auxiliary Valve Body Assembly:
CHANGE TO ASSEMBLY COMPONENTS:
^ New auxiliary valve body assembly with the following components (Figure 3 & 6):
- lo overrun clutch valve (364) and spring (365)
- abuse valve (360) and spring (361)
- orificed cup plug (359)
- accumulator piston (367) and spring (370)
- #5 checkball (used in the valve body on 1982 through early 1987 models, Figures 3 & 5)
- tube (96) from pump cover to auxiliary valve body (Figures 6 & 8)
Figure 19 - Oil Pump Assembly:
MAJOR COMPONENTS CHANGED WITH ADDITION OF NEW AUXILIARY VALVE BODY ASSEMBLY:
^ Cup plug (244) eliminated from pump cover (Figure 19) page 18
- tube (96) is used in this bore
Figure 7 - Installing And Sizing Turbine Shaft Seals:
^ New input housing assembly (621) with solid turbine shaft seals (619) (Figure 7)
- scarf cut seals MUST NOT be used in place of solid seals
- 6 mm forward clutch feed hole in turbine shaft (Figure 7)
Figure 4 - Case Checkballs And Filters:
Figure 6:
Figure 8 - Auxiliary Valve Body Assembly:
^ New spacer plate (56) and gaskets (88 & 89) (Figure 6, page 8)
^ New case assembly (10) (Figure 6)
- rib added to lo/reverse passage under auxiliary valve body (Figure 4)
- new orificed lube hole near governor bore in case
^ New auxiliary valve body assembly (67) (Figure 6)
- not interchangeable on transmissions without an auxiliary valve body
DATE OF CHANGE:
October 6, 1986, Julian Date 279, for all 1987 THM 700-R4 transmission models. All 1987 Service Replacement Transmission Assemblies (SRTA) models have the new auxiliary valve body assembly.
SERVICE ACTION:
IMPORTANT: THE "MAJOR COMPONENTS CHANGED" LISTED ON PAGE 4 CANNOT BE USED TO SERVICE 1982 THROUGH 1987 TRANSMISSIONS THAT DO NOT HAVE AN AUXILIARY VALVE BODY.
^ When using a new pump cover (see page 17) for a transmission with an auxiliary valve body, cup plug (244) must be removed.
Figure 4 - Case Checkballs And Filters:
^ When replacing a case assembly on a 1987 transmission, inspect the new case for a rib in the lo/reverse passage (Figure 4).
- if rib is present: use only on models with an auxiliary valve body
Figure 7 - Installing And Sizing Turbine Shaft Seals:
^ When servicing the turbine shaft seals (619) do not use scarf cut seals on a transmission with an auxiliary valve body. (See "Service Parts" section below).
- use installation tool (J 36418-1) and sizing tool (J 36418-2) for solid turbine shaft seals (Figure 7) page 8
^ Input housing and shaft assemblies (621) used on transmissions with an auxiliary valve body are not interchangeable with previous model year transmissions.
SERVICE PARTS:
Four input housing and turbine shaft assemblies are available for 1987 model transmissions:
Part Number Description
8657901 - 298 mm turbine shaft and input housing with scarf cut seals (for a
transmission without an auxiliary valve body)
8657902 - 245 mm turbine shaft and input housing with scarf cut seals (for a
transmission without an auxiliary valve body)
8657903 - 245 mm turbine shaft and input housing with solid seals (for a
transmission with an auxiliary valve body)
8657904 - 298 mm turbine shaft and input housing with solid seals (for a
transmission with an auxiliary valve body)
Six transmission case assemblies are available for 1987 model transmissions:
Part Number Description
*8648992 - Case Assembly Complete (for a transmission without an auxiliary
valve body)
*8648993 - Case Assembly Complete (for a transmission without an auxiliary
valve body)
*8648994 - Case Assembly Complete (for a transmission without an auxiliary
valve body)
*8648902 - Case Assembly Complete (for a transmission with an auxiliary
valve body)
*8648904 - Case Assembly Complete (for a transmission with an auxiliary
valve body)
*8648905 - Case Assembly Complete (for a transmission with an auxiliary
valve body)
*SEE SERVICE PARTS LIST FOR MODEL APPLICATION