Remove the servo switch.
Loosen the lock nut.
Holding the servo piston from rotating with a special key or torque wrench, tighten the adjusting bolt to 10 Nm. After loosening in several steps, tighten the adjusting bolt again to 5 Nm. Loosen the bolt again by 2-2.5 turns.
While holding the servo piston from rotating with a special key, tighten the lock nut to the required torque - 25-32 Nm.
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After installing the new O-ring into the groove located around the servo switch, straighten the O-ring so that it is not twisted.
Install the snap ring.