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13
MAINTENANCE AND INSPECTION
WARNING: Be sure to switch power OFF and disconnect the plug from the receptacle
during maintenance and inspection.
1. Inspecting the drill bits
Since use of a dull tool will cause motor malfunctioning and degraded efficiency, replace
the drill bit with a new one or resharpening without delay when abrasion is noted.
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 drill with loosened screws is extremely dangerous.
3. Keeping after use
When not in use, the Power tool should be
kept in a dry place out of the reach of children.
4. Inspecting the carbon brushes (Fig. 7)
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 portable 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. 7.
5. Replacing carbon brushes
Remove the brush caps (Fig. 1) with a slotted screwdriver. The carbon brushes can then
be easily removed.
6. Maintenance of the motor
The motor unit winding is the very “heart”’ of the power tool. Exercise due care to ensure
the winding does not become damaged and/or wet with oil or water.
7. 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.
0.47" (12 mm)
0.20" (5 mm)
Wear Limit
No. of Carbon Brush
21
ᮣ
ᮣ
Fig. 7
01Eng_D10YB_US 08/2/6, 19:2213