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MAINTENANCE AND INSPECTION
WARNING:
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:
3. Inspecting the carbon brushes (Fig. 8)
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. 73 indicated in Fig. 8.
4. Replacing carbon brushes (Refer to figure for name of parts)
Loosen the set screw then remove the tail cover. By loosening the brush cap, the carbon
brushes can be removed. After fitting new carbon brushes, properly retighten the brush
cap and mount the tail cover.
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.
NOTE:
Specifications are subject to change without any obligation on the part of the HITACHI.
16
Be sure to switch power OFF and disconnect the plug from the receptacle
during maintenance and inspection.
Using this demolition hammer with loosen screws is extremely
dangerous.
No. of carbon
brush
Wear limit
73
0.28" (7 mm)
0.67" (17 mm)
Fig. 8
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