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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 retainer (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
No. of carbon
Wear limit brush
86
0.28” (7 mm)
0.67” (17 mm)
Fig. 8
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 ⋅ 8) 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 a 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.
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