InFocus H55SC - Manual (Page 12)

English
12
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 screws
Regularly inspect all screws and ensure that they are properly tightened. Should any of
the screws be loose, retighten them immediately.
WARNING: Using this Demolition Hammer with loosen 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. 4)
The motor employs carbon brushes which are consumable parts. When they become
worn to or near “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 Nos. shown in the figure.
In addition, always keep carbon brushes clean and ensure that they slide freely within
the brush holders.
CAUTION:
Using this Demolition Hammer with a carbon brush which is worn in excess of the
wear limit will damage the motor.
Fig. 4
NOTE: Use HITACHI carbon brush No. 71 indicated in Fig. 4
Wear limit
No. of carbon brush
0.28" (7 mm)
0.67" (17 mm)
71
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