Pull off the seal with extractor 999 5919.
Lubricate and install a new seal. Use drift 999 5450.
Note: The seal is normally positioned at the same level as the
internal beveled edge. If the shaft journal is showing signs of wear,
the seal can be pressed in a further 2 mm by turning the drift socket.
Finishing Install
the trigger wheel. Tighten to 17 Nm (12 ft. lbs.) .