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21
MAINTENANCE AND INSPECTION
WARNING
To avoid an accident or personal injury, always
confirm that the trigger switch is turned OFF and the
power plug has been disconnected from the
receptacle before performing any maintenance or
inspection of this tool.
1. Inspecting the saw blade
Always replace the saw blade immediately upon the
first sign of deterioration or damage.
A damaged saw blade can cause personal injury and
a worn saw blade can cause ineffective operation and
possible overload to the motor.
CAUTION
Never use a dull saw blade. When a saw blade is dull,
its resistance to the hand pressure applied by the tool
handle tends to increase, making it unsafe to operate
the power tool.
2 Inspecting the carbon brushes
For your continued safety and electrical shock
protection, carbon brush inspection and replacement
on this tool should ONLY be performed by a Hitachi
Authorized Service Center.
3. About Handling the Motor (see Fig. 1)
Winding of the motor is said to be the heart of this
tool. Exercise utmost caution not to damage the
winding by exposing it to wash oil or water.
NOTE
Accumulation of dust and the like inside the motor
can result in a malfunction.
After using the motor for 50 hours or so, carry out no-
load running, and blow in the dry air from a wind hole
at the motor's rear. Such action is effective to
discharge dust and the like.
4. Inspecting the screws
Regularly inspect each component of the power tool
for looseness.
Re-tighten screws on any loose part.
WARNING
To prevent personal injury, never operate the power
tool if any components are loose.
5. Inspecting the lower guard for proper operation
Before each use of the tool, test the lower guard (see
Fig. 7) to assure that it is in good condition and that it
moves smoothly.
Never use the tool unless the lower guard operates
properly and it is in good mechanical condition.
6. Storage
After operation of the tool has been completed, check
that the following has been performed:
(1) Trigger switch is in OFF position,
(2) Power plug has been removed from the receptacle,
When the tool is not in use, keep it stored in a dry
place out of the reach of children.
7. Replacement of guard
After long-term use, the blade slot in the guard may
widen and require replacement. If the blade slot
should widen, replace the guard with a new one. After
replacing, make a groove on it. Refer to “1. Cutting a
groove on the guard” on page 8.
Fig. 56
8. Replacement of Poly-V-Belt
The power of the motor is transmitted to the saw blade
by a Poly-V-Belt. When the Poly-V-Belt is broken or
damaged, remove the belt cover by loosening the four
5 mm screws (see Fig. 2) and replace the damaged
one with the new one.
When connecting the belt on pulleys, first connect 2
or 3 teeth of Poly-V-Belt to the grooves of the pulley
(A) and pulley (B). Then turning the pulley (A) and
pulley (B), connect all 13 teeth of the belt to the pulleys.
Fig. 57
9. Lubrication
Lubricate the following sliding surfaces once a month
to keep the power tool in good operating condition
for a long time (see Fig. 1 and Fig. 2). Use of machine
oil is recommended.
Oil supply points:
* Rotary portion of hinge
* Rotary portion of vise assembly
* Rotary portion of holder (A)
10. Cleaning
Periodically remove chips, dust and other waste
material from the surface of the power tool, especially
from the inside of the lower guard with a damp, soapy
cloth. To avoid a malfunction of the motor, protect it
from contact with oil or water.
If the laser line becomes invisible due to chips and
the like adhered onto the window of the laser marker's
light-emitting section, wipe and clean the window with
a dry cloth or a soft cloth moistened with soapy water,
etc.
11. Replacing supply cord
If the supply cord of Tool is damaged, the Tool must
be returned to Hitachi Authorized Service Center for
the cord to be replaced.
Guard
Poly-V-belt
Pulley (B)
Pulley (A)
03Eng_C12LSH_Eng 4/26/07, 5:33 PM21