2. Remove the circlip.
3. Remove the servo switch.
4. Loosen the lock nut.
5. Holding the piston of the servo mechanism from rotation with a special key (09454-33000), torque wrench (09454-33100) tighten the adjusting bolt to 10 Nm. Loosen and tighten the adjusting bolt twice and then finally tighten it to 5 Nm. Loosen the bolt again 2-2.25 turns.
6. While holding the servo piston from rotation with a special wrench, tighten the locknut to the required torque.
- Locknut: 25-32 Nm.
7. After installing the new O-ring in the groove around the servo switch, straighten the O-ring so that it is not twisted. Install the servo switch in the housing, then install the circlip.