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22
MAINTENANCE AND INSPECTION
WARNING: Be sure to turned off the switch and remove the battery before
maintenance and inspection.
1. Inspecting the blade
Continued use of a dull or damaged blade will result in reduced cutting efficiency and may
cause overloading of the motor. Replace the blade with a new one as soon as excessive
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. 29)
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. 30, Fig. 31.
When installing the carbon brush, choose the direction
so that the nail of the carbon brush (Fig. 30) agrees
with the contact portion outside the brush tube (Fig.
32). Then push it in with a finger.
Lastly, install the brush cap.
Fig. 29
Fig. 30
0.45"
(11.5 mm)
0.12" (3 mm)
Wear limit
Nail ofcarbon brush
Protrusion of
carbon brush