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Wrench
Depressed
center
wheel
Wheel
washer
Spindle
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.
10
Wheel
nut
Wheel
guard
Push button
Fig. 5
CAUTION:
Tighten the wheel nut securely and confirm that
the depressed center wheel does not wobble.
2.
Disassembly
To remove the depressed center wheel, simply
reverse the above-mentioned procedure.
Wear limit
21
0.67" (17mm)
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. 21 indicated in Fig.
6.
Replacing carbon brushes:
Remove the brush caps (Fig. 1) with a slotted
screwdriver. The carbon brushes can then be easily
removed.
No. of carbon
brush
0.24" (6mm)
Fig. 6
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