Shindaiwa 488EMC, Owner'S/Operator'S Manual

Page: 12 / 23

12
Chain Brake Operation and Service
Chain Brake Operation
This saw is equipped with a dual function
chain brake designed to stop the saw chain
from rotating whenever kickback occurs.
WARNING!
The chain brake is installed only to
reduce the risk from kickback! The
chain brake is not a substitute for
careful operation!
IMPORTANT!
Release the throttle whenever the chain
brake is activated!
IMPORTANT!
The chain brake system for models 285s
and 352s is not adjustable! If the chain
brake fails to stop the chain in any of the
following steps, DO NOT USE THE SAW!
Return the saw to your dealer for repairs.
WARNING!
■
Periodically clean the brake mechanism
of sawdust or debris.
■
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.
CAUTION!
Never start or operate this saw while
the chain brake is activated!
■
Engaging the brake lever causes a
brake band to tighten around the clutch
drum, stopping the saw chain.
■
The chain brake is designed to engage
whenever the brake lever strikes the
operator's hand or from the inertial
effects of kickback.
■
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.
(Position 1).
Both of the above 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 OPERATE THE SAW!
Return the saw to your dealer for repairs!
■
Never carry the saw by the brake lever!
Carry the saw by the front handle.
Chain Brake Maintenance
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.
2. With the saw on a flat stable surface,
maintain 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.
1
2
Chain
Stopped
Chain Can Move
Step 1: Inertia Chain Brake Function
(engine “off”)
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.
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 inches above a solid wood block.
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.
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.
CAUTION!
Operating the saw at wide open
throttle for longer than 5 seconds
without a load could result in engine
damage.
Chain Brake Testing
■
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!
Step 1
Step 2
13
Cutting with the Saw
THINK SAFETY!
Always use full throttle while cutting! Keep the chain sharp and let the saw do the
work! Forcing the saw into the work reduces cutting performance, and can damage
the saw through overheating!
Clear a safe
work area
before cutting.
Stop the saw before moving it to
or from the work area.
Wear hearing protection
and eye protection such
as a face shield or
goggles when operating
the unit.
Always wear
gloves when
operating this
saw.
Use full-throttle while
cutting and apply only enough
bar pressure to maintain engine
speeds of 9000-10,000 rpm
(min
-1
).
Wear close-fitting
clothing to protect
your legs and arms.
Do not wear clothing
or jewelry that could
get in the machinery
or brush.
Keep a proper footing
(do not overreach)!
Wear
appropriate
nonskid footwear.
Never operate with a loose
saw chain!
Never operate the saw if
fastenings are loose or
missing!
Never operate the saw if
any component parts are
damaged, loose, or
missing!
IMPORTANT!
Always wear leg protection (Chaps)
made of a cut-resistant material such
as ballistic nylon covering the full
length of the thigh to the top of the
boot.