Jeep Cherokee

 Service Manual

Transmission and transfer case » AW-4 automatic transmission » Disassembly and assembly
Overdrive support

DISASSEMBLY

(1) Check brake piston operation. Mount support on clutch (Fig. 229).

(2) Apply compressed air through support feed hole and observe brake piston movement (Fig. 229).

Piston should move smoothly and not bind or stick. If operation is incorrect, replace piston and support.

(3) Remove thrust bearing front race, thrust bearing and rear race (Fig. 230).

(4) Turn overdrive support over and remove bearing race and clutch drum thrust washer (Fig. 231).

(5) Compress piston return spring with Spring Compressor 7537 and remove piston snap ring (Fig.

232).

Fig. 229 Checking Brake Piston Movement

1 - BRAKE PISTON
2 - OVERDRIVE SUPPORT
3 - SUPPORT FEED HOLE
4 - CLUTCH

Fig. 230 Removing Support Thrust Bearing And Races

1 - THRUST BEARING
2 - FRONT RACE
3 - REAR RACE

Fig. 231 Removing Clutch Drum Thrust Washer And Race

1 - BEARING RACE
2 - OVERDRIVE SUPPORT
3 - THRUST WASHER

Fig. 232 Removing/Installing Piston Snap Ring

1 - COMPRESSOR TOOL
2 - SNAP RING

(6) Mount support in direct clutch and remove brake piston with compressed air. Apply air to same feed hole used when checking piston operation.

(7) Remove and discard support O-rings (Fig. 233).

(8) Remove support seal rings (Fig. 234).

(9) Measure free length of piston return springs with springs mounted in retainer (Fig. 235). Length should be 17.23 mm (0.678 in.).

(10) Clean support components and dry them with compressed air.

(11) Inspect overdrive support and brake piston.

Replace support and piston if either part is worn or damaged.

ASSEMBLY

(1) Lubricate new support seal rings. Then compress rings and install them on support (Fig. 236).

(2) Lubricate and install new O-rings on brake piston. Then carefully seat piston in support.

(3) Install return springs on brake piston.

(4) Compress return springs with Spring Compressor 7537 (Fig. 232) and install piston snap ring.

(5) Install support bearing race and clutch drum thrust washer (Fig. 231).

(6) Install thrust bearing and front and rear bearing races. Thrust bearing rollers should face upward as shown (Fig. 236).

(7) Verify thrust bearing/race sizes (Fig. 237).

•  Front race outer diameter is 47.8 mm (1.882 in.) and inside diameter is 30.7 mm (1.209 in.).
•  Rear race outer diameter is 47.8 mm (1.882 in.) and inside diameter is 34.3 mm (1.350 in.).
•  Bearing outer diameter is 47.7 mm (1.878 in.) and inside diameter is 32.7 mm (1.287 in.).

(8) Verify brake piston operation. Use same procedure described at beginning of disassembly. Piston should operate smoothly and not bind or stick.

Fig. 233 Overdrive Support Components

1- PISTON SNAP RING
2 - BRAKE PISTON
3 - FRONT RACE
4 - REAR RACE
5 - OVERDRIVE SUPPORT
6 - THRUST BEARING
7 - BEARING RACE
8 - CLUTCH DRUM THRUST WASHER
9 - SUPPORT SEAL RINGS
10 - BRAKE PISTON O-RINGS
11 - PISTON RETURN SPRING

Fig. 234 Removing Support Seal Rings

1 - SEAL RINGS (2)
2 - SUPPORT

Fig. 235 Checking Piston Return Spring Length

1 - PISTON RETURN SPRINGS
2 - SPRING RETAINER

Fig. 236 Installing Support Seal Rings

1 - COMPRESS SEAL RINGS BEFORE INSTALLATION
2 - OVERDRIVE SUPPORT

Fig. 237 Installing Support Thrust Bearing And Races

1 - REAR RACE
2 - THRUST BEARING
3 - FRONT RACE

Transmission

Oil pump

Overdrive planetary gear and clutch

Overdrive support

Direct clutch

Forward clutch

Front planetary gear

Sun gear and no. 1 one-way clutch

Second brake

Planetary/brake pack/output shaft

Transmission valve body