Valve Body Switch And Solenoid Service - Hummer H1 Service Manual

5-136 Transmission/Transfer Case
VALVE BODY SWITCH AND SOLENOID
SERVICE
The following electrical components can be replaced once the
oil pan and/or valve body are removed from the transmission
(Figure 5-37):
• 1-2 and 2-3 shift solenoids
• pressure switch
• pressure control solenoid
• converter clutch solenoid
• wiring harness
The park lock actuator components are also accessible after
valve body removal. Refer to Park Lock Component Service.
PRESSURE
CONTROL
VALVE
SOLENOID
BODY
CONVERTER
WIRING HARNESS
CLUTCH
SOLENOID
Figure 5-37: Valve Body Switch and Solenoid
Locations
Valve Body Removal
1. Remove oil pan and filter. Refer to Fluid and Filter
Replacement procedure in this section.
2. Remove bolts attaching lube pipe clamp and retainer.
Then carefully remove lube pipe (Figure 5-38).
3. Disconnect wiring harness from switch and solenoids.
4. Remove special bolts attaching pressure switch to valve
body and remove switch. Keep special bolts separate and
note position for installation reference (Figure 5-38).
5. Remove bolts attaching dipstick stop and park detent
spring to valve body and remove stop and spring.
6. Remove remaining valve body bolts and carefully remove
valve body, spacer plate, and gasket.
HARNESS
CASE
CONNECTOR
PRESSURE
SWITCH
1-2
SHIFT
SOLENOID
2-3
SHIFT
SOLENOID
___________________________________________
CAUTION: The valve body check-balls are not secured and are
loose. Keep the valve body level and the spacer plate in position
during removal. This will avoid losing or mispositioning the
check-balls. The check-balls are not available separately, they
are available only as part of a complete valve body assembly.
WIRING
HARNESS
CABLE
CLAMP
LUBE
PIPE
CLAMP
Figure 5-38: Valve Body Removal/Installation
7. Remove necessary solenoid from valve body. Refer to
Figure 5-37 or Figure 5-39 for solenoid locations.
8. Remove wiring harness, if it is to be replaced.
PRESSURE CONTROL
SOLENOID SCREEN
VALVE BODY
BOLT (TYPICAL)
PRESSURE
SWITCH
SPECIAL
BOLT (6)
DETENT
SPRING
LUBE
PIPE
®
VALVE
BODY
DIPSTICK
STOP
LUBE
PIPE
RETAINER