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14
MAINTENANCE AND INSPECTION
WARNING: ⅷ Be sure to switch power OFF and disconnect the plug from the
receptacle during maintenance and inspection.
ⅷ Using cracked, deformed or damaged wheels can lead to wheel
breakage and resulting serious injury.
1. Replacing the depressed center wheel
Replace the depressed center wheel when it has been worn out to about 2-3/8" (60mm)
in external diameter. Confirm that there is no crack or any damage to the depressed
center wheel. If there is a crack or a transformation in the wheel, replace it immediately.
2. Inspecting the screws
Regularly inspect all screws and ensure that they are fully tightened. Should any of the
screws be loosened, retighten them immediately.
WARNING: Using this grinder with loosened screws is extremely dangerous.
3. Confirm that there is no damage in the
wheel guard, the cord and housing, etc.
Furthermore, confirm that there is no
sbnormality in the activation of the
switch.
4. Inspecting the carbon brushes (Fig. 6)
The Motor employs carbon brushes which
are consumable parts. When they become
worn to or near the ”wear limit“, it could
result in motor trouble. When an auto-stop
carbon brush is equipped, the motor will
stop automatically. At that time, replace
both carbon brushes with new ones which
have the same carbon brush Numbers
shown in the figure. In addition, always
keep carbon brushes clean and ensure that
they slide freely within the brush holders.
CAUTION:
● Using this grinder with a carbon brush which is worn in excess of the wear limit will
damage the motor.
NOTE: Use HITACHI carbon brush No. 76 or No. 88 indicated in Fig. 6.
Fig. 6
No. of
carbon brush
Usual carbon brush 88
Auto-stop carbon brush 76
Wear limit
No. of carbon
brush
0,67" (17mm)
0,24" (6mm)