15MS 210, MS 230, MS 250
– Remove the chain sprocket
cover.
: Disengage the chain brake by
pulling the hand guard toward the
front handle.
VA
143RA004
: Remove the E-clip (1).
: Remove the washer (2).
– Remove the rim sprocket, if fitted.
: Pull off the clutch drum / chain
sprocket.
: Take the needle cage out of the
sprocket.
– Clean and inspect the clutch
drum / chain sprocket.
VA
143RA007
: Inspect the clutch drum (1) for
signs of wear.
If there are noticeable wear marks
on the inside diameter of the clutch
drum, check its wall thickness. If it is
less than 80% of the original wall
thickness, fit a new clutch drum.
VA
148RA101
80%
100%
!
If the clutch drum has to be
replaced, also check the brake band
– b 5.4.
: If the clutch drum/chain sprocket
is still serviceable, use No. 120
emery paper or emery cloth
(grain size approx. 120 µm) to
clean and roughen its friction
surface.
Reassemble in the reverse
VA
176RA330
sequence.
– Clean stub of crankshaft. Wash
needle cage in clean white spirit
and lubricate with grease –
b 13.
– Replace damaged needle cage.
– Rotate clutch drum/chain
sprocket and apply slight
pressure at the same time until oil
pump drive spring engages
properly.
– If rim sprocket was fitted, re-
install it with the cavities facing
outward.
5. Clutch, Chain Drive,
Chain Brake and Chain
Tensioner
5.1 Clutch Drum / Chain
Sprocket
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