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15
Fig. 6
Fig. 7
Carbon
Brush
Spring
Brush Holder
Wear limit
0.26" (6.5mm)
No. of carbon
brush
0.89" (22.5mm)
61
MAINTENANCE AND INSPECTION
WARNING: Be sure to switch power OFF and disconnect the plug from the receptacle
during maintenance and inspection.
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 electrical cord and the
housing, etc.
Check that the on/off switch operates
normally.
4. Inspecting the carbon brushes (Fig. 6)
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 grinder with a carbon brush
which is worn in excess of the wear limit
will damage the motor.
NOTE: Use HITACHI carbon brush No. 61
indicated in Fig. 6.
⅜ Replacing carbon brushes:
<Disassembly>
(1) Loosen the D4 tapping screw retaining
the brush cover and remove the brush
cover.
01Eng_G18MR_US 08/1/10, 11:4815