Stihl MS 661 C-M, Instruction Manual

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0000-GXX-1218-A0

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► Use a STIHL filing gauge (2) to check the

height of the depth gauges (1). The STIHL fil‐

ing gauge must match the chain pitch.

► If a depth gauge (1) projects from the filing

gauge (2): Lower the depth gauge (1),   16.3.

0000-GXX-1372-A0

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2

3

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► 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 chainsaw and contact

your STIHL servicing dealer for assistance.

► Use a STIHL filing gauge to check that a filing

angle of 30° has been maintained on all cut‐

ters. The STIHL filing gauge must match the

chain pitch.

► If a filing angle of 30° has not been main‐

tained: Resharpen the saw chain.

► If you have any queries: Contact your STIHL

servicing dealer for assistance.

10.4

Testing the Chain Brake

► Shut off the engine and engage the chain

brake.

WARNING

■ The chain's cutters are very sharp. There is a

risk of cut injuries.

► Wear work gloves made of durable material.

► Try to pull the chain along the guide bar by

hand.

If the chain cannot be pulled along the bar by

hand, the chain brake is functioning.

► If the chain can be pulled along the bar by

hand: Do not use your chainsaw and contact

your STIHL servicing dealer for assistance.

The chain brake is defective.

10.5

Checking the Controls

Throttle trigger lockout and throttle trigger

► Shut off the engine and engage the chain

brake.

► Attempt to pull the trigger without depressing

the lockout lever.

► If the trigger can be pulled: Do not use your

chainsaw and contact your STIHL servicing

dealer for assistance.

There is a malfunction in the throttle trigger

lockout.

► Press down the throttle trigger lockout and

hold it there.

► Pull the throttle trigger and release it again.

► If the throttle trigger is stiff or does not spring

back to its idle position: Do not use your chain‐

saw and contact your STIHL servicing dealer

for assistance.

The throttle trigger is defective.

Stopping the Engine

► Start the engine.

► Move the Master Control lever to position  .

The engine stops and the Master Control lever
springs back to position  .

► If the engine does not stop:

► Move the Master Control lever to posi‐

tion  .

The engine stops.

► Do not use your chainsaw and contact your

STIHL servicing dealer for assistance.

Your saw has a malfunction.

10.6

Checking Chain Lubrication

► Start the engine and disengage the chain

brake.

► Hold the guide bar over a light surface.

► Open the throttle.

Chain oil is thrown off the chain and is visible

on the light surface. Chain lubrication is oper‐

ating properly.

11 Operating the Saw

11.1

Setting to winter mode

The carburetor may ice up if the engine is oper‐

ated at temperatures below +10 °C. The shutter

must be set to the winter mode so that the carbu‐

retor is additionally heated by warm air from

around the engine.

English

11 Operating the Saw

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0458-759-0121-D. VA0.A21.