Maintenance And Inspection - Hitachi G 10SR Instruction Manual And Safety Instructions

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MAINTENANCE AND INSPECTION

WARNING:
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 mounting screws
Regularly inspect all mounting screws and ensure that they are properly tightened.
Should any of the screws be loosened, retighten them immediately.
WARNING:
3. Confirm that there is no damage in the wheel
guard, the cord and the housing, etc.
Furthermore, confirm that there is no abnormality in
the activation of the switch.
4. Inspecting the carbon brushes (Fig. 4)
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. 21 indicated in Fig. 4.
Replacing carbon brushes:
Remove the brush caps (Fig. 1) with a slotted screwdriver. The carbon brushes can then
be easily removed.
5. Service and repairs
All quality power tools will eventually require servicing or replacement of parts because
of wear from normal use. To assure that only authorized replacement parts will be used,
all service and repairs must be performed by a HITACHI AUTHORIZED SERVICE CENTER,
ONLY.
14
Be sure to switch power OFF and disconnect the plug from the receptacle
during maintenance and inspection.
Using this grinder with loosen screws is extremely dangerous.
No. of carbon
brush
Wear limit
21
0.24" (6mm)
0.67" (17mm)
Fig. 4