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Checking and Replacing
Chain Sprocket
:
Remove the chain sprocket cover,
chain and guide bar.
:
Disengage the chain brake:
Pull hand guard toward the front
handle.
–
Replace the chain sprocket after
using two Oilomatic chains.
–
Replace sooner if the wear marks
on the sprocket are deeper than
approx. 0.02 in (0,5 mm) since this
would reduce the life of the chain.
You can use a gauge (see "Special
Accessories") to check the depth of
the wear marks on sprockets.
It is best to use two chains in
rotation with one sprocket.
Use only original STIHL chain sprockets
to ensure correct operation of the chain
brake.
MS 440, MS 440 W, MS 440 C
5
6
2
1
4
3
6
:
Use a screwdriver to remove
the E-clip (1).
:
Take off the washer (2) and rim
sprocket (3).
:
Examine splines (arrow) on clutch
drum (4) – if wear marks are severe,
fit a new clutch drum.
:
Pull clutch drum or spur sprocket
(5) and needle cage (6) off the
crankshaft.
Installing spur sprocket /
rim sprocket
:
Clean the crankshaft stub and
needle cage, and lubricate with
STlHL grease (see "Special
Accessories").
:
After fitting clutch drum or spur
sprocket, rotate it about one turn to
engage oil pump drive.
:
Fit rim sprocket with cavities facing
outward.
:
Refit washer and E-clip on the
crankshaft.
2
1
English / USA
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