Replacing the Gasket and O-Ring For the Servo Cylinder

Replacing the gasket and O ring for the servo cylinder

Note! The servo cylinder is located in the transmission.

Caution! Cleanliness is extremely important when working on automatic transmissions. Use lint free paper or rags.

Caution! Read through the instructions before beginning work.

Removal

Preparations




Suck the oil from the transmission.
Take out a container for the oil.
Raise the car.

Remove:
- the splash guard under the engine. Blow and wipe clean around the transmission oil trough
- the transmission oil trough. See Transmission oil / oil filter, replacing Removal and Replacement.

Removing the servo cylinder (2-1)




Remove the three screws.
Pull down the cover with the servo cylinder. Check the position of the small strainer on the cylinder.

Caution! Note the position of the strainer for reinstallation.

Lift the piston from the cover.

Disassembling servo cylinder




Open the catch on the push rod (press the piston towards the work surface).
Separate the cylinder.

Check:
- for dirt or other particles in the cylinder
- that both the springs are intact.
Blow the cylinder clean.

Replacing the gasket, O-ring and strainer




Replace the O-ring on the piston.
Replace the gasket on the inner piston.

Note! Check the position of the gasket on the piston.

Remove the strainer by pulling it straight up. Replace the strainer.

Installation

Assembling the servo cylinder




Apply a little petroleum jelly to the inner piston gasket. Use Volvo Genuine parts petroleum jelly (P/N 116 1151-4).
Carefully press the piston up into the cylinder.
Install the catch on the push rod.

Installing the servo cylinder on the transmission





Note! The strainer on the piston must come into the opening on the left in the transmission.

Apply petroleum jelly to the O-ring. Use Volvo Genuine parts petroleum jelly (P/N 116 1151-4).
Install the piston in the housing. Hold the piston in position by hand. Check that the strainer is opposite the opening on the left hand side.
Slide the cover up towards the piston. Lower the piston towards the cover. Press the piston down into the cover using your fingers so that the O-ring cannot be seen on the piston.




Install the screws. Hand tighten the screws (secure the cover so that all the screws are aligned).
Tighten the screws. Tighten to 25 Nm.

Finishing
Install the oil trough. See Transmission oil / oil filter, replacing Removal and Replacement.
Top up with oil. Check the oil level. See Transmission oil / oil filter, replacing Removal and Replacement.
Test driving.