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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 this demolition hammer
Since use of a dull accessory, such as a bull point, a cutter, etc., will degrade efficiency
and cause possible motor malfunction, sharpen or replace with a new one 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 retainner (Fig. 2 and 3)
The retainer may become loose due to excessive use. Always, pay attention to its proper
functioning to securely hold the accessory shank portion. If any wear and tear is found,
bring this demolition hammer to an authorized service center for maintenance service.
4. 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 results
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 8. In addition, always keep carbon
brushes clean and ensure that they slide
freely within the brush holders.
NOTE: Use HITACHI carbon brush No. 86 indicated in Fig. 8.
5. Replacing carbon brushes (Refer to figure for name of parts)
Loosen the screws (Hexagon socket hd. bolt M4 × 10) of the cap covers, then remove
the cap covers. After removing the brush caps, the carbon brushes can be removed.
After replacing the carbon brushes, tighten the brush caps, then mount the cap covers
securely.
6. Grease replacement
This demolition hammer is of fully oil sealed construction to protect against dust
incursion and to prevent lubricant leakage. This demolition hammer 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.
Fig. 8
Wear limit
0.28” (7 mm)
No. of carbon
brush
0.67” (17 mm)
86