Band Apply Servo: Service and Repair

Overdrive Servo





Special Tool(s)

Removal

1. NOTE: Servicing the intermediate/overdrive servo in the vehicle is only recommended in the event of a leak. If servicing is required due to a servo condition, it is necessary to remove and disassemble the transaxle to inspect the intermediate/overdrive band assembly and direct clutch for damage.

Raise the vehicle on a hoist.





2. WARNING: The servo is under pressure. Servo and servo cover are under high spring force. Use caution when removing servo cover. Failure to follow these instructions may result in personal injury.

Assemble the special tool.





3. Remove the splash shield.





4. Remove the transmission cooler line bracket and bolt, and position the bracket out of the way.





5. CAUTION: Do not use a screwdriver to remove the retaining ring or damage to the case may occur. Use only snap ring pliers to remove the retaining ring.

Using the special tool, remove the servo retaining ring.
1 Install the special tool.
2 Compress the servo assembly by tightening the bolt.
3 Remove the retaining ring.





6. Remove the special tool.
7. Remove the servo cover assembly.
8. Remove the intermediate and overdrive servo piston and return spring.
9. Wipe the servo piston and the servo cover cap with a lint-free cloth.

10. CAUTION: Do not clean the rubber sealing surfaces of the servo piston and the servo cover cap with cleaning solvent or damage to the sealing surface may result.

Inspect the servo piston for cracks on its pressure surfaces and in the sealing area. Look for damage near the point where the servo piston is attached to the servo rod.
11. Squeeze the servo piston lip for flexibility. If the lip feels brittle, install a new piston.
12. Inspect the servo retainer spring for cracks, breaks or deformation.

Installation





1. WARNING: Servo return spring force is very high. Failure to follow these instructions may result in personal injury.

Assemble the special tool.





2. Install the special tool.





3. CAUTION: Do not use a screwdriver to install the retaining ring or damage to the case may occur. Use only snap ring pliers to install the retaining ring.

NOTE: If the servo cover will not seat deep enough in the bore to install the servo cover retaining ring, use a blunt punch or small hammer and gently tap the cover around the outer edge until the servo cover retaining ring can be installed.

Tighten the special tool bolt.
^ Install the servo cover retaining ring.
4. If the case is stamped "WG", install a wide-groove snap ring, or the servo will be damaged.





5. Loosen the special tool bolt.
^ When the spring tension is released, remove the special tool.





6. Install the transmission fluid cooler line.





7. Install the splash shield.
8. Lower the vehicle.
9. Start the vehicle. Place transmission range selector lever in each gear and allow to engage. Check for leaks.
10. Check transmission fluid.