Checking The Saw Chain; Testing The Chain Brake - Stihl MSA 120 C Instruction Manual

11 Checking the Saw
► Measure depth of bar groove with scale on STIHL filing
gauge.
► Install a new guide bar if the following points apply:
– Guide bar is damaged.
– Measured bar depth is less than specified minimum
depth, @ 19.3.
– 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 to check the height of the depth
gauges (1). The STIHL filing gauge must match the chain
pitch.
0458-716-9621-B
► If a depth gauge (1) projects from the filing gauge (2):
► Make sure the service marks (1 to 4) on the cutters are
► If one of the service marks is not visible on a cutter:
► Use a STIHL filing gauge to check the filing angles on the
► If the filing angles are not correct: Sharpen the chain,
► If you have any queries: Contact your STIHL servicing

11.4 Testing the Chain Brake

► Engage the chain brake and remove the battery.
1
The chain's cutters are very sharp. This can result in
personal injury.
► Wear work gloves made of durable material.
► Try to pull the chain along the guide bar by hand.
► If the chain can be pulled along the bar by hand: Contact
Lower the depth gauge (1), @ 17.3.
2
4
visible.
Contact your STIHL servicing dealer.
cutters, @ 19.4. The STIHL filing gauge must match the
chain pitch.
@ 19.4.
dealer.
WARNING
If the chain cannot be pulled along the bar by hand, the
chain brake is functioning.
your STIHL servicing dealer.
The chain brake is defective.
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