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23
MAINTENANCE AND INSPECTION
WARNING: Be sure to turn off the switch and remove the battery before 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. 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.
4. Inspecting the carbon brushes (Fig. 15)
The motor employs carbon brushes which
are consumable parts. Since and excessively
worn carbon brush can result in motor
trouble, replace the carbon brush with new
ones when it becomes worn to or near the
“wear limit”. In addition, always keep carbon
brushes clean and ensure that they slide
freely within the brush holders.
NOTE:
When replacing the carbon brush with a new
one, be sure to use the Hitachi Carbon Brush
Code No. 999058.
5. Replacing carbon brushes
Take out the carbon brush by first removing
the brush cap and then hooking the protrusion
of the carbon brush with a slotted-head screw
driver, etc., as shown in Fig. 16, Fig. 17.
When installing the carbon brush, choose
the direction so that the nail of the carbon
brush (Fig. 16) agrees with the contact portion
outside the brush tube (Fig. 18). Then push it
in with a finger.
Lastly, install the brush cap.
Fig. 15
Fig. 16
0.45"
(11.5 mm)
0.12" (3 mm)
Wear limit
Nail of
carbon brush
Protrusion of
carbon brush