Reverse Clutch

4R70E/4R75E

Reverse Clutch









Reverse Clutch Disassembled View









Disassembly

1. Remove the No. 2 forward clutch bearing.





2. Remove the reverse clutch selective retaining ring.





3. Remove the reverse clutch pack.





4. Using the Clutch Spring Compressor tools, compress the reverse clutch piston spring.





5. Remove the reverse clutch piston spring retaining ring.





6. Remove the reverse clutch piston spring pressure ring.

1. Remove the reverse clutch piston spring.

2. Remove the reverse clutch piston spring pressure ring.





7. NOTE: To ease reverse clutch piston removal, it may be necessary to apply air pressure to the reverse clutch drum. Block the opposite hole.

Remove the reverse clutch piston.





8. Remove the reverse clutch piston inner and outer seals.





Assembly

1. NOTE: One tab that locks the reverse clutch drum into the reverse sun shell may be removed. This is done for balancing purposes.

Inspect the clutch cylinder thrust surfaces, piston bore and clutch plate serrations for scores or burrs. Minor scores or burrs may be removed with crocus cloth. Install a new clutch cylinder if badly scored or damaged.

2. Check the transmission fluid passage in the clutch cylinder for obstructions. Clean out all transmission fluid passages. Inspect clutch piston for scores and install new if necessary. Inspect the check balls for freedom of movement and correct seating.

3. Check the clutch release spring for distortion and cracks. Install a new spring (including wave spring) if distorted or cracked.

4. Inspect the composition clutch plates, steel clutch plates and clutch pressure plate for worn or scored bearing surfaces. Install new parts if they are deeply scored or burred.

5. Check the clutch plates for flatness and fit on the clutch hub serrations. Discard any plate that does not slide freely on serrations or that is not flat.

6. Check the clutch hub thrust surfaces for scores and clutch hub splines for wear.

7. NOTE: The piston check ball must be present and moving freely.

Install a new reverse clutch piston inner and outer seals.





8. NOTE: Coat the reverse clutch piston inner seal, outer seal, drum sealing area and special tools with petroleum jelly.

Using the Transmission Reverse Clutch Inner Fluid Seal Protector and the Transmission Reverse Clutch Outer Fluid Seal Protector, install the reverse clutch piston using even pressure to push it to the bottom of the reverse clutch drum.





9. NOTE: The dished side of the reverse clutch piston spring must face the reverse clutch piston.

Install the reverse clutch piston spring.

1. Install the reverse clutch piston spring pressure ring.

2. Install the reverse clutch piston spring.





10. Using the Clutch Spring Compressor tools, compress the reverse clutch piston spring.





11. Install the reverse clutch piston wave spring retaining ring with the points down.





12. Remove the Clutch Spring Compressor tool.

13. NOTICE: Install the pressure plates with the flat sides facing the clutch pack or damage may occur to the clutch pack.

NOTE: Before assembly, soak the new clutch discs in transmission fluid.

Install the reverse clutch front pressure plate, clutch pack and reverse clutch rear pressure plate.





14. Install the reverse clutch pressure plate retainer snap ring.





15. Install the Dial Indicator Gauge with Holding Fixture on the reverse clutch pack.
- Push downward on the clutch pack.

- Release pressure and zero the Dial Indicator Gauge.





16. Using the Dial Indicator Gauge with Holding Fixture, check the reverse clutch pack clearance.

1. Lift up on the clutch pack until it fully seats against the reverse clutch pressure plate retainer.

2. Read the Dial Indicator Gauge.
- If clearance is not within specifications, install the correct size retaining ring.










17. Check the clutch for correct operation.
- Apply air pressure to the reverse clutch drum. The clutch should be heard and felt to work without leakage.