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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 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.
Inspecting the carbon brushes: (Fig. 6)
The motor employs carbon brushes which are
consumable parts. When they become worn to or
near "wear limit", it bN ld 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.
73
0.67" (17 mm)
NOTE:
Use HITACHI carbon brush No. 73 indicated in Fig.
6
Wear limit
No. of carbon brush
0.28" (7 mm)
Fig. 6
4.
Replacing carbon brushes:
(For parts name, refer to Fig. 1)
Loosen the two set screws and remove the tail
cover. Remove the brush caps and carbon brushes.
After replacing the carbon brushes, tighten the
brush caps securely and to install the tail cover
with securely tightening two set screws.
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.)
Ask for grease replacement at the nearest
authorized Hitachi Service Center.
In the case that you are forced to change the grease
by yourself, please follow the following points.
(2) How to replace grease
CAUTION:
Before replacing the grease, turn the power off
and pull out the plug from the receptacle.
1 Disassenble the crank cover and thorougly wipe
off the old grease inside.
2 Supply 0.9 oz (35 g) (the standard volume to cover
the connecting rod) of Hitachi Electric Hammer
Grease A in the crank case.
3 After replacing the grease, reassemples the crank
cover securely. At this time, do not damage or lose
the oil seal.
Crank cover
English
Fig. 7
9
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