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14
MAINTENANCE AND INSPECTION
WARNING: Be sure to switch power OFF and disconnect the plug from the
receptacle during maintenance and inspection.
1. Inspecting the tool
Since use of a dull tool will degrade efficiency and cause possible motor malfunction,
sharpen or replace the tool as soon as abrasion is noted.
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: Using this demolition hammer with loosen screws is extremely
dangerous.
3. Inspecting the carbon brushes (Fig. 12)
The Motor employs carbon brushes which
are consumable parts. When they become
worn to or near the “wear limit”, it could
result in motor trouble. When an auto-stop
carbon brush is equipped, the motor will
stop automatically. At that time, replace
both carbon brushes with new ones which
have the same carbon brush Numbers
shown in the figure. In addition, always
keep carbon brushes clean and ensure that
they slide freely within the brush holders.
NOTE: Use HITACHI carbon brush No. 74 indicated in Fig. 12.
4. Replacing carbon brushes (Refer to figure for name of parts)
Loosen the set screw then remove the tail cover. By loosening the brush caps, the
carbon brushes can be removed. After fitting new carbon brushes, properly retighten
the brush caps and mount the tail cover.
5. Grease replacement
This machine is of fully oil sealed construction to protect against dust incursion and to
prevent lubricant leakage. This machine can be used without grease replenishment for
an extended period of time. However, perform the grease replacement to extend the
service life. Replace the grease as described below.
(1) Grease Replacement Period
Inspect the grease amount according to the timing replacement period of the carbon
brush. (See item 3 in the section MAINTENANCE AND INSPECTION.)
Ask for grease replacement at the nearest authorized Hitachi Service Center.
In the case that you are forced to change the grease by yourself, please follow the
following points.
74
Wear limit
0.28” (7 mm)
No. of carbon
brush
0.67” (17 mm)
Fig. 12