Stihl FC 90 - Clutch Drum and Bearing

39Series 4180 Powerhead
– Remove the engine, b 7.6.1
: Remove the retaining ring (1).
Different fan housings are fitted to
the powerhead:
VA
249RA135
1
Pressure die cast fan housing.
Polymer fan housing.
Differences in removal and
installation procedures for the clutch
drum and bearing are described
below.
Polymer fan housing.
: Support the ball bearing at the
clutch drum (2) side with removal
tool (1) 5910 890 4602.
249RA184 BL
1
2
– Turn the removal tool and fan
housing over – so that the fan
housing rests on the removal
tool.
All models
: Insert extension 4180 893 4400
(1) in square hole and press
clutch drum out of bearing seat in
the direction of the engine.
Remove the bearing as follows:
VA
249RA136
1
Pressure die cast fan housing.
: Remove the retaining ring (1).
: Press out the ball bearing (2) in
the direction of the engine.
249RA185 BL
1
2
Polymer fan housing.
: Take out the screw (1).
: Use a suitable arbor to press the
ball bearing (2) out of its seat.
249RA186 BL
1
2
All models
– Replace all damaged parts.
Reassemble in the reverse
sequence.
– Install new ball bearing with press
arbor 4119 893 7200.
Polymer fan housing.
: Fit the screw (1), b 3.4
7.6.3 Clutch Drum and Bearing