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Hummer H1 (2002+). Manual - part 84

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Transmission/Transfer Case 5-135

05745159

CONVERTER HOUSING UPPER COVER
REPLACEMENT

Remove converter housing upper cover from transmission
flange (Figure 5-35).

Remove gasket from cover.

Clean gasket or sealer remains from transmission flange.

Figure 5-35: Converter Housing Upper Cover

Mounting

Apply sealer to gasket and install gasket on cover.

Install cover on transmission flange.

CONVERTER HOUSING LOWER COVER
REPLACEMENT

Remove crossover pipe.

Remove converter housing upper cover.

Remove lower bolts and remove cover from transmission
(Figure 5-36).

Remove gasket from housing cover.

Clean sealer or gasket remains from transmission flange.

Figure 5-36: Converter Housing Lower Cover

Mounting

Apply sealer to gasket and install on cover.

Apply sealer to housing cover.

Install housing cover on transmission flange.

Install converter housing upper cover.

10. Install crossover pipe.

TRANSMISSION

FLANGE

TRANSMISSION

GASKET

CONVERTER HOUSING

UPPER COVER

GASKET

CONVERTER

HOUSING

LOWER

COVER

TRANSMISSION

FLANGE

5-136

Transmission/Transfer Case

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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.

Figure 5-37: Valve Body Switch and Solenoid

Locations

Valve Body Removal

Remove oil pan and filter. Refer to Fluid and Filter
Replacement procedure in this section.

Remove bolts attaching lube pipe clamp and retainer.
Then carefully remove lube pipe (Figure 5-38).

Disconnect wiring harness from switch and solenoids.

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).

Remove bolts attaching dipstick stop and park detent
spring to valve body and remove stop and spring.

Remove remaining valve body bolts and carefully remove
valve body, spacer plate, and gasket.

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.

Figure 5-38: Valve Body Removal/Installation

Remove necessary solenoid from valve body. Refer to
Figure 5-37 or Figure 5-39 for solenoid locations.

Remove wiring harness, if it is to be replaced.

CONVERTER

CLUTCH

SOLENOID

WIRING HARNESS

VALVE

BODY

PRESSURE

CONTROL

SOLENOID

PRESSURE

SWITCH

HARNESS

CASE

CONNECTOR

1-2

SHIFT

SOLENOID

2-3

SHIFT

SOLENOID

LUBE

PIPE

CLAMP

LUBE

PIPE

DETENT

SPRING

LUBE

PIPE

RETAINER

VALVE BODY

BOLT (TYPICAL)

SPECIAL
BOLT (6)

PRESSURE

SWITCH

CABLE

CLAMP

DIPSTICK

STOP

VALVE

BODY

PRESSURE CONTROL

SOLENOID SCREEN

WIRING

HARNESS

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Transmission/Transfer Case 5-137

05745159

Figure 5-39: Solenoid Identification

Valve Body Installation

Install replacement solenoid or wiring harness as required.

Verify that valve body spacer plate and gasket are in
position. Also be sure check-balls were not displaced.
There should be eight check-balls.

Install valve body guide pins J–25025-B in transmission
case.

Carefully position valve body on guide pins and
transmission case. Install 2-3 bolts to hold valve body in
place and remove guide pins.

Install pressure switch, dipstick stop, harness clamp and
detent spring but do not fully tighten bolts at this time.

Install lube pipe, retainer, and pipe clamp (Figure 5-38).

Tighten valve body bolts to 97 lb-in. (11 N•m) torque.
Start at center and work outward in a spiral pattern
(Figure 5-40).

Figure 5-40: Valve Body Bolt Tightening Sequence

(in Numerical Order)

CAUTION:

The valve body bolts must be tightened to speci-

fied torque and in the indicated pattern. Overtightening or ran-
dom tightening will distort the valve body resulting in valve
bind, cross leakage, and shift problems.

Connect wire harness to solenoids and switch.

Install oil filter and oil pan.

10. Refill transmission with Dexron III.

PARK LOCK COMPONENT SERVICE

The park lock components can be serviced without removing
the transmission.

Access to the park lock components requires removal of the oil
pan and valve body. Part replacement procedure is as follows.

Park Lock Component Replacement

Remove oil pan and valve body as described in this sec-
tion.

Remove nut that retains detent on shaft (Figure 5-41).
Then remove shaft pin.

Remove park pawl bracket bolt and bracket.

Remove detent and actuator rod (Figure 5-41).

Remove park pawl stud, retainer, spring, shaft, and plug
(Figure 5-41).

Clean parts to be reused with solvent, dry with compressed
air, and lubricate with Dexron III.

Install pawl shaft in case. Then install pawl on shaft.
Install new shaft cup plug in case with 5/16 in. (7.9 mm)
diameter rod.

Install pawl retainer and return spring (Figure 5-41).

Assemble detent and actuator rod. Then install rod over
pawl.

10. Install detent shaft and seal. Be sure shaft is properly

seated in detent.

11. Install detent nut on shaft. Tighten nut to 18 lb-ft (24 N•m)

torque.

12. Install shaft pin.

13. Install actuator rod bracket and bolts. Tighten bolts to 18

lb-ft (24 N•m) torque.

14. Install return spring stud.

15. Install valve body, oil filter and oil pan.

16. Refill transmission with Dexron III. Correct fluid level is

at top, or within cross hatch area on dipstick, with fluid
hot, engine idling and transmission in park.

2-3 SHIFT

SOLENOID B

1-2 SHIFT

SOLENOID A

CLAMP

CLIP

PRESSURE

CONTROL

SOLENOID

CONVERTER

CLUTCH

SOLENOID

5-138

Transmission/Transfer Case

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Figure 5-41: Park Lock Components

PARK

PAWL

STUD

BRACKET

BOLT (2)

DETENT

NUT

ACTUATOR

ROD

DETENT

SHAFT

PIN

DETENT

SHAFT

SEAL

RETAINER

RETURN
SPRING

CUP

PLUG

PAWL
SHAFT

Content .. 82 83 84 85 ..