Reverse Servo Assembly: Installation

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

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.
  
  Fig 1: Installing Reverse Servo Return Spring And Piston
  Courtesy of FORD MOTOR CO.
Install the Servo Piston Installer and tighten the band apply bolt.
- Tighten to 5.6 Nm (50 lb-in).
  
  Fig 2: Identifying Servo Piston Installer (307-073)
  Courtesy of FORD MOTOR CO.
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.
  
  Fig 3: Locating Dial Indicator Gauge With Holding Fixture To Transmission
  Courtesy of FORD MOTOR CO.
Loosen the bolt until the piston stops against the Dial Indicator Gauge.

Fig 4: Identifying Dial Indicator Gauge
Courtesy of FORD MOTOR CO.
Verify the amount of piston travel on the Dial Indicator Gauge is within specification.

Fig 5: Identifying Piston Travel On Dial Indicator Gauge
Courtesy of FORD MOTOR CO.
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
  
  Fig 6: Identifying Servo Piston Assembly Correct Installation Position
  Courtesy of FORD MOTOR CO.
Remove the Dial Indicator Gauge with Holding Fixture and servo selection tool.

Fig 7: Locating Dial Indicator Gauge With Holding Fixture And Servo Selection Tool
Courtesy of FORD MOTOR CO.
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.
  
  Fig 8: Identifying Reverse Band Servo Spring And Reverse Band Servo Cover
  Courtesy of FORD MOTOR CO.
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.
  
  Fig 9: Identifying Servo Piston Remover/Installer (307-251)
  Courtesy of FORD MOTOR CO.
Install the main control valve body. For additional information, refer to MAIN CONTROL VALVE BODY .

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.

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