Maintenance And Inspection - Hitachi H 45SB2 Instruction Manual

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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 mal-
function, 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 tight-
ened. Should any of the screws be loose, retighten them immediately.
WARNING:
3. Inspecting the carbon brushes
(Fig. 5)
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 auto-
matically. 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.
NOTE: Use HITACHI carbon bruch No. 73 indicated in Fig. 5.
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 re-
tighten the brush cap and mount the tail cover.
16
Be sure to switch power OFF and disconnect the plug during
maintenance and inspection.
Using this demolition hammer with loosened screws is extremely
dangerous.
No. of Carbon
Brush
Wear Limit
73
0.24" (6 mm)
0.67" (17 mm)
Fig. 5