Stihl MS 661 C-M Instruction Manual page 15

5 IMPORTANT SAFETY INSTRUCTIONS
￭ Proper tension of the chain is extremely important to
maximize cutting performance and reduce the risk of
personal injury from chain breakage, derailment or
reactive forces:
– Read and follow the chain tensioning instructions,
@ 10.3.
– Always make sure the chain sprocket cover is
tightened securely after tensioning the chain in order
to secure the bar. Never start the chain saw with the
chain sprocket cover loose or missing.
– Check chain tension once more after tightening the
chain sprocket cover.
– After adjusting the chain, let the motor run for a
minute or two, then shut off the engine, engage the
chain brake and recheck chain tension.
– Check chain tension periodically thereafter at
regular intervals (only after engaging the chain brake
and shutting off the engine).
– Never cut with a loose chain. If the chain becomes
loose while cutting, engage the chain brake and shut
off the engine before tightening the chain. Never
attempt to adjust the chain while the engine is
running.
￭ To reduce the risk of fire and explosion:
– Check fuel system for leaks, especially the visible
parts, (e.g., filler cap, hose connections).
– Securely mount the spark plug boot on the spark
plug.
– Do not start the engine if the fuel system has leaks
or the saw is otherwise damaged. Have the chain
saw repaired by an authorized STIHL servicing
dealer before using it.
0458-759-8221-C
￭ Using a chain saw that is modified, damaged, improperly
adjusted or maintained, or not completely and securely
assembled can lead to a malfunction and increase the risk
of serious personal injury or death.
– Never operate a chain saw that is modified,
damaged, improperly maintained or not completely
and securely assembled.
– Always check your chain saw for proper condition
and operation before starting work, particularly the
throttle trigger, throttle trigger lockout, Master
Control Lever, front hand guard, chain brake and
cutting attachment.
– Ensure that the throttle trigger and throttle trigger
lockout move freely and always spring back to the
idle position when released. The throttle trigger must
not engage until the throttle trigger lockout is
depressed. The Master Control Lever must move
easily to STOP.
– Never attempt to modify or override the controls or
safety devices in any way.
– If your saw or any part is damaged or does not
function properly, take it to your authorized STIHL
servicing dealer. Do not use the saw until the
problem has been corrected.
￭ Before starting the engine and disengaging the chain
brake, take the following steps to reduce the risk of
personal injury from reactive forces, loss of control or
inadvertent contact with the chain:
– Be sure that the guide bar and chain are clear of you
and all other obstructions and objects, including the
ground.
– Never attempt to start or accelerate the engine when
the guide bar is in a cut or kerf. Doing so could lead
to reactive forces and injury.
– Read and follow the instructions on starting the
chain saw, @ 14.
English
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