EarthQuake CS4518B User Manual
Page 12
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12
Operator's Manual
CS4518B CHAINSAW
SAFETY FEATURES
This saw is equipped with certain safety features and devices
to protect the user from harm in the event the saw reacts
unexpectedly to external forces:
1. Chain Brake: The saw is equipped with a chain brake
designed to stop the chain instantaneously upon
activation. The chain brake can be activated in one of
two ways:
•
The forward hand guard doubles as an activation
lever for the hand brake. It can be activated manually,
or it may be activated by the user’s arm if a kickback
occurs.
•
The saw is also equipped with an “Inertial Chain
Break.” The same mechanism as above is activated by
the inertial force created when a counterweight under
the forward hand guard accelerates toward the bar
nose during a kickback.
•
Proper cleaning and care of the chain brake system
are required to ensure reliable operation in the field.
You should also check your chain brake for proper
operation regularly. To check your chain brake:
•
Manually activate the chain brake by pushing the
forward hand guard toward the bar nose (SEE
FIGURE 3-A). There will be an audible click when the
chain brake engages. If there is no audible click, the
chain brake may already be engaged. Pull back on
the forward hand guard to deactivate the brake (SEE
FIGURE 3-B). An audible click should be heard when
the brake disengages. If there is still no audible click,
the brake is not functioning properly. Remove the
clutch cover, clean and reassemble, and re-test. If no
audible click is heard, contact customer service for
further assistance.
•
With the saw’s engine shut off and the chain brake
disengaged, firmly grasp both handles and hold the
saw over a log or low stump. Swing the bar nose
sharply down until it makes contact. This should
create enough inertial force to automatically activate
the chain brake. When the chain brake engages, an
audible click should be heard. If no audible click is
heard, the brake is not functioning properly. Remove
the clutch cover, clean and reassemble, and re-test. If
no audible click is heard, contact customer service for
further assistance.
NOTE: Chain break must be in the OFF position to run the
chainsaw.
BREAK ON
BREAK OFF
A - chain break ON
B - chain break OFF
FIGURE 3
2. Throttle Interlock: This saw is equipped with a
throttle interlock designed to prevent accidental
engagement of the throttle control. The throttle
interlock is disengaged by depressing the red tab on
top of the rear handle. This is usually accomplished
when the user grasps the rear handle to operate the
saw.
3. Chain Catcher: Each saw is equipped with a chain
catcher beneath the clutch cover. If the chain is ever
thrown from the guide bar, or if the chain breaks, the
chain catcher is designed to capture the chain and
prevent it from whipping back toward the operator.
NOTE: Inspect the chain catcher before each use. Replace
if missing or badly damaged.
4. Kickback Reduction Guide Bar and Saw Chain:
This saw has been equipped with a Double Guard®
91 guide bar and 91P S-Series Low Kickback saw
chain by Oregon®. The features of this bar and chain
combination are design to reduce the risk of kickback.
To maintain adequate kickback prevention, only
use these components when replacing guide bar or
saw chain. (Refer to the Maintenance section of this
manual for full details.)