Switching Off; Checking The Chain Saw; Checking The Operation Of The Chain Brake; Testing The Controls - Stihl MSA 300.0 Instruction Manual

17 Checking the Chain Saw

► Squeeze the trigger switch (3) with your index finger.
The saw will switch on and the chain will start rotating.
You can also unlock the trigger switch by first pressing the
retaining button and then depressing the trigger switch
lockout within 5 seconds (after you press the retaining
button, the "STATUS" LED will flash for 5 seconds, or until
the trigger switch lockout is depressed). The "STATUS" LED
and the "POWER LEVEL" LED glow. Squeeze the trigger
switch with your index finger. The saw will switch on and the
chain will start rotating.
The saw will not switch on until the trigger switch lockout and
retaining button have been depressed and the trigger switch
has been squeezed.
If the trigger switch and the trigger switch lockout are
released, the "STATUS" LED and the LED of the current
power level will remain flashing for approximately 1 second.
As long as the LEDs are flashing, the saw can again be
switched on without pressing the retaining button.
The further the trigger switch is squeezed, the faster the saw
chain will rotate. When power level
the trigger switch does not have to be fully pressed to reach
the maximum power.

16.2 Switching Off

WARNING
The saw chain will continue to rotate for a short while after
the trigger switch is released. To avoid serious or fatal injury,
avoid contact with the moving saw chain. To reduce the risk
of personal injury from unintended activation or
unauthorized use, switch off the motor, ensure the chain has
stopped, engage the chain brake and remove the battery
before transporting or putting the chain saw down.
To switch the chain saw off:
► Release the trigger switch and trigger switch lockout so
that the trigger switch springs back to the locked position.
In the locked position, activation of the trigger switch is
blocked by the trigger switch lockout. Activation of the
chain saw is also electronically blocked by the retaining
button once the "STATUS" LED stops flashing (after
approximately 5 seconds).
0458-009-8201-A
The saw chain will continue to rotate for a short time after the
trigger switch is released. Take care to avoid contact after
releasing the trigger switch and when setting down the chain
saw.
17 Checking the Chain Saw

17.1 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.
is selected,
Before starting work, check the operation of the chain brake:
► Disengage the chain brake, @ 14.2.
► Switch on the chain saw, @ 16.1.
► 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.

17.2 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:
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