Checking The Chain Saw; Checking The Operation Of The Chain Brake; Testing The Controls - Stihl MSA 220.0 T Instruction Manual

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20 Checking the Chain Saw

20.1 Checking the Operation of the Chain Brake

WARNING
Operating the saw with a missing, damaged, modified or
improperly maintained chain brake increases the risk of
severe or fatal injury from kickback. Never attempt to modify
or disable the chain brake. Never operate a saw if the chain
brake has been modified or does not function properly. If you
detect a change in the operating characteristics of the chain
brake, have your saw serviced immediately by an authorized
STIHL servicing dealer.
Before starting work, check the operation of the chain brake:
► Disengage the chain brake, @ 17.2.
► Switch on the chain saw, @ 19.1.
► Engage the chain brake by pushing the front hand guard,
away from the front handle.
A properly functioning chain brake will stop the chain
within fractions of a second.
► If the chain brake fails to stop the chain within fractions of
a second, have the saw inspected and repaired by an
authorized STIHL servicing dealer.

20.2 Testing the Controls

Before starting work, confirm that the trigger switch
lockout (1), retaining button (2) and trigger switch (3) are
undamaged and functioning properly:
48
3
Trigger Switch Lockout (1), Retaining Button (2) and Trigger
Switch (3)
WARNING
To reduce the risk of serious or fatal injuries, keep hands,
feet and other parts of the body away from the chain. Do not
touch the saw chain while the battery is inserted. Never
touch moving chain with your hand or any part of your body,
@ 6.5.2. Keep bystanders out of the area while testing the
controls.
To test the controls:
► Remove the battery.
► Attempt to depress the trigger switch.
If the trigger switch can be depressed without first
depressing the trigger switch lockout, take the chain saw
to an authorized STIHL servicing dealer to be repaired
before use.
► Press down on the trigger switch lockout and retaining
button. Make sure they move freely and spring back into
place when released.
► Insert the battery.
► Hold the chain saw firmly with both hands, your left hand
on the front handle and your right hand on the control
handle. Depress and hold the trigger switch lockout, press
the retaining button with your thumb and squeeze the
trigger switch with your index finger.
The chain saw should switch on. If it does not, take the
chain saw to an authorized STIHL servicing dealer to be
repaired before use.
20 Checking the Chain Saw
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0458-007-8601-A