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Fig. 24
MAINTENANCE AND INSPECTION
WARNING: To avoid serious accident, ensure the switch is in the OFF position and
disconnect the plug from the receptacle during maintenance and
inspection.
1. Inspecting the saw blade:
Since use of a dull saw blade will degrade efficiency and cause possible motor
malfunction, sharpen or replace the saw blade as soon as abrasion is noted.
CAUTION:
If a dull saw blade is used, reactive force is increased during cutting operation. Avoid
the use of the dull saw blade without repair.
2. Check the mounting screws
Loose mounting screws are dangerous. Regularly inspect them and make sure they are
tight.
CAUTION: Using this power tool with loosened screws is extremely dangerous.
3. Inspecting the carbon brushes (Fig. 24)
The motor employs carbon brushes which are
consumable parts. Replace the carbon brush
with a new one when it becomes worn to its
wear limit. Always keep carbon brushes clean
and ensure that they slide freely within the
brush holders.
CAUTION:
Using this circular saw with a carbon brush which is worn in excess of the wear limit will
damge the motor.
NOTE: Use HITACHI carbon brush No. 38 indicated in Fig. 24.
4 Replacing carbon brushes:
Remove the brush caps with a slotted-head screwdriver. The carbon brushes can then be
easily removed.
5. Performance checkup and maintenance of safety cover
Keep the safety cover in good shape for smooth performance at all times. Be sure to make
prompt repair in case of any malfunction.
6. Adjusting the base and saw blade to maintain perpendicularity
The angle between the base and the saw blade has been adjusted to 90°, however should
this perpendicularity be lost for some reason, adjust in the following manner.
Wear limit
No. of carbon
brush
0.24"(6mm)
38
0.67"
(17mm)