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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 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
:
Using this demolition hammer with loosen screws
is extremely dangerous.
3.
Inspecting the carbon brushes (Fig. 11)
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.
CAUTION:
Using this Demolition Hammer with a carbon
brush which is worn in excess of the wear limit
will damage the motor.
Fig. 10
CAUTION:
After long time of use, the cylinder case becomes hot.
Therefore, be careful not to burn your hands.
Wear limit
0.67" (17 mm)
NOTE:
Use HITACHI carbon brush No. 74 indicated in Fig. 11.
4.
Replacing carbon brushes (Refer to figure for name
of parts)
Loosen the set screw then remove the tail cover.
By loosening the brush caps, the carbon brushes
can be removed. After fitting new carbon brushes,
properly retighten the brush caps and mount the
tail cover.
5.
Grease replacement
This machine is of fully oil sealed construction to
protect against dust incursion and to prevent
lubricant leakage. This machine 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.
(1) Grease Replacement Period
Inspect the grease amount according to the timing
replacement period of the carbon brush. (See item
3 in the section MAINTENANCE AND
INSPECTION.)
English
No. of carbon brush
74
0.28" (7 mm)
Fig. 11
9
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