Chain Brake - Shindaiwa 502s Owner's/Operator's Manual

Chain Brake

Chain Brake Operation
This saw is equipped with a dual func-
tion chain brake designed to stop the
saw chain from rotating whenever kick-
back occurs.
WARNING!
The chain brake is installed
only to reduce the risk from kickback!
The chain brake is not a substitute for
careful operation!
Chain Brake Testing
Step 1: Inertia Chain Brake Function (engine "OFF")
WARNING!
Both of the following testing
procedures must cause the chain
brake to engage and prevent the
saw chain from moving! If the chain
brake does not fully engage and
prevent the saw chain from moving
during either test, DO NOT OPER-
ATE THE SAW! Return the saw to
your dealer for repairs!
Use the following procedure to test for
proper operation:
1. Turn the engine "OFF," and verify
that the ignition switch is in the "O" or
"OFF" position.
Step 2: Manual Chain Brake Function (engine running)
Use the following procedure to test for
proper operation:
1. Start the saw and warm the engine to
operating temperature.
CAUTION!
Operating the saw at wide open throt-
tle for longer than 5 seconds without
a load could result in engine damage.
Chain Brake Maintenance
CAUTION!
Never start or operate this saw while
the chain brake is activated!
■
Periodically clean the brake mecha-
nism of sawdust or debris.
12
WARNING!
The chain brake system for
this unit type 502s is not adjust-
able! If the chain brake fails to stop
the chain when activated, DO NOT
USE THE SAW! Return the saw to
your dealer for repairs.
IMPORTANT!
Release the throttle whenever the chain
brake is activated!
Step 1
2. Hold the chain saw normally, gripping
the rear handle with the right hand
and the front handle with the left hand.
While keeping the chain saw level, hold
the nose of the guide bar approximately
14" (35 cm) above a solid wood block.
2. With the saw on a flat stable surface, main-
tain a firm grip on the rear handle with the
right hand and the top of the front handle
with the left hand. The left hand should be
centered with the front hand guard.
3. Accelerate engine to full throttle, then,
without releasing the front handle, roll
the left wrist forward against the front
hand guard/chain brake lever to push the
brake lever forward until the chain brake
activates (position 2). The saw chain
must stop immediately. If either of step 1
or step 2 tests fail, contact an authorized
Shindaiwa dealer for repairs.
■
If the chain brake becomes damaged
or worn, or fails to completely engage
or release the clutch drum, return the
saw to your dealer for repairs.
■
Never carry the saw by the brake lever!
Carry the saw by the front handle.
1. Engaging the brake lever causes a
brake band to tighten around the
clutch drum, stopping the saw chain.
2. The chain brake is designed to engage
whenever the brake lever strikes the
operator's hand or from the inertial
effects of kickback.
3. The chain brake can also be activated
by pushing the brake lever forward
manually.
To release (disengage) the chain brake,
pull the brake lever rearward, towards the
front handle until a positive stop is felt.
3. Release the front handle only and allow
the guide bar nose to drop onto the
wood. The chain brake lever should
move forward to position 2 and activate
the brake as soon as the nose strikes
the wood block. Wearing gloves, make
sure that the saw chain cannot be
pulled around the guide bar.
Step 2
1
Chain Can Move
■
Always stop the saw and disengage
the chain brake before removing or
replacing the clutch cover!
■
Never make carburetor adjustments
while the chain brake is engaged!
2
Chain
Stopped