Reverse Servo Assembly

Reverse Servo Assembly





Removal

1. WARNING: Before servicing a vehicle equipped with a fire suppression system, depower the system by following the procedure in Fire Suppression System. Failure to follow the instructions may result in serious personal injury. Procedures

Remove the main control valve body. For additional information, refer to Main Control Valve Body Main Control Valve Body.

2. Using the Servo Piston Remover/Installer, remove the reverse band servo retaining ring.

1. Compress the servo spring.

2. Remove the reverse band servo retaining ring.





3. Remove the reverse servo assembly.

1. Remove the reverse band servo cover.

2. Remove the reverse band servo piston and rod.

3. Remove the reverse band servo spring.





Installation

NOTE: This is not an ordinary installation procedure and does not compensate for band wear.

1. NOTE: Lubricate the reverse piston seal to facilitate assembly and prevent damage to the seal.

Install the reverse servo return spring and piston.

- Do not install the piston cover.





2. Install the Servo Piston Installer and tighten the band apply bolt.
- Tighten to 5.6 Nm (50 lb-in).





3. Attach the Dial Indicator Gauge with Holding Fixture to the transmission.
- Position the Dial Indicator Gauge stem on the flat portion of the reverse servo piston and zero the Dial Indicator Gauge.





4. Loosen the bolt until the piston stops against the Dial Indicator Gauge.





5. Verify the amount of piston travel on the Dial Indicator Gauge is within specification.





6. If piston travel is not within specification, select and install the correct servo piston assembly to bring the servo piston travel within specification.

1. One groove

2. Two groove

3. Three groove





7. Remove the Dial Indicator Gauge with Holding Fixture and servo selection tool.





8. Install the correct reverse servo assembly.

1. Install the reverse band servo spring.

2. Install the reverse band servo piston and rod.

3. Install the reverse band servo cover.





9. Using the Servo Piston Remover/Installer, install the reverse servo retaining ring.

1. Compress the servo spring.

2. Install the reverse band servo retaining ring.





10. Install the main control valve body. For additional information, refer to Main Control Valve Body Main Control Valve Body.

11. WARNING: If the vehicle is equipped with a fire suppression system, repower the system. For important safety warnings and procedures, refer to Fire Suppression System. Failure to follow these instructions may result in serious personal injury. Description and Operation

If equipped with a fire suppression system, repower the system.