Checking and Replacing Chain Sprocket

English / USA

: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.

001BA121 KN

5

6 2

1

4

3

6 2

1

KN

 

001BA122

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.

–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.

: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.

MS 440, MS 440 W, MS 440 C

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