Makita 4131 Manuel D'instruction page 4

touch the blade or any other part, in all angles and
depths of cut.
To check lower guard, open lower guard by hand,
then release and watch guard closure. Also check to
see that Retracting Lever does not touch tool hous-
ing. Leaving blade exposed is VERY DANGEROUS
and can lead to serious personal injury.
3. Check the operation and condition of the lower
guard spring. If the guard and the spring are not
operating properly, they must be serviced before
use. Lower guard may operate sluggishly due to
damaged parts, gummy deposits, or a buildup of
debris.
4. Always observe that the lower guard is covering
the blade before placing tool down on bench or
floor. An unprotected, coasting blade will cause the
tool to walk backwards, cutting whatever is in its
path. Be aware of the time it takes for the blade to
stop after switch is released.
5. NEVER hold piece being cut in your hands or
across your leg. It is important to support the work
properly to minimize body exposure, blade binding,
or loss of control.
6. Hold tool by insulated gripping surfaces when
performing an operation where the cutting tool
may contact hidden wiring or its own cord. Con-
tact with a "live" wire will also make exposed metal
parts of the tool "live" and shock the operator.
7. When ripping always use a rip fence or straight
edge guide. This improves the accuracy of cut and
reduces the chance for blade binding.
8. Always use blades with correct size and shape
(diamond vs. round) arbor holes. Blades that do
not match the mounting hardware of the tool will run
eccentrically, causing loss of control.
9. Never use damaged or incorrect blade washers
or bolts. The blade washers and bolt were specially
designed for your tool, for optimum performance and
safety of operation.
10. Causes and Operator Prevention of Kickback:
Kickback is a sudden reaction to a pinched, bound
or misaligned saw blade, causing an uncontrolled
tool to lift up and out of the workpiece toward the
operator.
When the blade is pinched or bound tightly by the
kerf closing down, the blade stalls and the motor
reaction drives the unit rapidly back toward the oper-
ator.
If the blade becomes twisted or misaligned in the
cut, the teeth at the back edge of the blade can dig
into the top surface of the workpiece causing the
blade to climb out of the kerf and jump back toward
operator.
Kickback is the result of tool misuse and/or incorrect
operating procedures or conditions and can be
avoided by taking proper precautions as given
below:
Maintain a firm grip with both hands on the tool
and position your body and arm to allow you to
resist KICKBACK forces. KICKBACK forces can be
controlled by the operator, if proper precautions are
taken.
When blade is binding, or when interrupting a
cut for any reason, release the trigger and hold
the tool motionless in the material until the blade
comes to a complete stop. Never attempt to
remove the tool from the work or pull the tool
backward while the blade is in motion or KICK-
BACK may occur. Investigate and take corrective
actions to eliminate the cause of blade binding.
When restarting a tool in the workpiece, center
the saw blade in the kerf and check that saw
teeth are not engaged into the material. If saw
blade is binding, it may walk up or KICKBACK from
the workpiece as the tool is restarted.
Support large panels to minimize the risk of
blade pinching and KICKBACK. Large panels tend
to sag under their own weight. Supports must be
placed under the panel on both sides, near the line
of cut and near the edge of the panel as shown in
Fig. 1.
To minimize the risk of blade pinching and kickback.
When cutting operation requires the resting of the
tool on the workpiece, the tool should be rested on
the larger portion and the smaller piece cut off.
Fig. 1 To avoid kickback, do support board or panel near
the cut.
Fig. 2 Do not support board or panel away from the cut.
Do not use dull or damaged blade. Unsharpened
or improperly set blades produce narrow kerf caus-
ing excessive friction, blade binding and KICKBACK.
Keep blade sharp and clean. Gum and pitch hard-
ened on blades slows tool and increases potential
for kickback. Keep blade clean by first removing it
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