Replacing the cover
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Replace the O-ring on the piston
Install the O-rings on the cover.
The illustration shows the order of installation.
NOTE:
Do not let the piston fall to the floor. If the piston falls to the floor, it must be checked thoroughly for damage.
CAUTION:
The piston cannot be replaced. The transmission is calibrated using this piston. A piston from another transmission cannot be used. The entire transmission must be replaced if the piston is damaged.