Overdrive Support

DISASSEMBLY

Checking Brake Piston Movement:

1. Check brake piston operation. Mount support on clutch.
2. Apply compressed air through support feed hole and observe brake piston movement. Piston should move smoothly and not bind or stick. If operation is incorrect, replace piston and support.

Removing Support Thrust Bearing And Races:

3. Remove thrust bearing front race, thrust bearing and rear race.

Removing Clutch Thrust Washer And Race:

4. Turn overdrive support over and remove bearing race and clutch drum thrust washer.

Overdrive Support Components AW-4 Automatic Transmission:

5. Compress piston return spring with Spring Compressor 7537 and remove piston 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.

Removing/Installing Piston Snap Ring:

7. Remove and discard support O-rings.

Removing Support Seal Rings:

8. Remove support seal rings.

Checking Piston Return Spring Length:

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

Installing Support Seal Rings:

1. Lubricate new support seal rings. Then compress rings and install them on support.
2. Lubricate and install new O-rings on brake piston. Then carefully seat piston in support.
3. Install return springs on brake piston.

Overdrive Support Components AW-4 Automatic Transmission:

4. Compress return springs with Spring Compressor 7537 and install piston snap ring.

Removing Clutch Thrust Washer And Race:

5. Install support bearing race and clutch drum thrust washer.
6. Install thrust bearing and front and rear bearing races. Thrust bearing rollers should face upward as shown.

Installing Support Thrust Bearing And Races:

7. Verify thrust bearing/race sizes.
- Front race outer diameter is 47.8 mm (1.882 inch) and inside diameter is 30.7 mm (1.209 inch).
- Rear race outer diameter is 47.8 mm (1.882 inch) and inside diameter is 34.3 mm (1.350 inch).
- Bearing outer diameter is 47.7 mm (1.878 inch) and inside diameter is 32.7 mm (1.287 inch).
8. Verify brake piston operation. Use same procedure described at beginning of disassembly. Piston should operate smoothly and not bind or stick.