Checking The Guide Bar; Checking The Saw Chain - Stihl MSA 120 C Instruction Manual

11 Testing the Chain Saw and Battery
a
► Use a STIHL gauge to check the wear marks on the
sprocket.
► If wear marks are deeper than a = 0.5 mm: Do not use your
chain saw and contact your STIHL servicing dealer.
The chain sprocket must be replaced.

11.2 Checking the Guide Bar

► Switch off the chain saw, engage the chain brake and
remove the battery.
► Remove the chain and guide bar.
► Measure depth of bar groove with scale on STIHL filing
gauge.
► Install a new guide bar if one of the following points
applies:
– Guide bar is damaged.
– Measured bar depth is less than specified minimum
depth, @ 20.3.
0458-716-0121-B
– Bar groove is pinched or splayed.
► If you have any queries: Contact your STIHL servicing
dealer.

11.3 Checking the Saw Chain

► Switch off the chain saw, engage the chain brake and
remove the battery.
2
► Use a STIHL filing gauge (2) to check the height of the
depth gauges (1). The STIHL filing gauge must match the
chain pitch.
► If a depth gauge (1) projects from the filing gauge (2):
Lower the depth gauge (1), @ 17.3.
2
4
► Make sure the service marks (1 to 4) on the cutters are
visible.
► If one of the service marks is not visible on a cutter: Do not
use your chain saw and contact your STIHL servicing
dealer.
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