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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. How to replase grease
This machine is full air-tight construction to protect against dust and to prevent lubricant
leakage. Therefore, the machine can be used without lubrication for long periods.
Replace the grease as described below.
Grease replacement period
You should look at the grease when you change the carbon brush. (See item 4 in the
section MAINTENANCE AND INSPECTION.) Ask for grease replacement at the nearest
HITACHI Authorized Service Center. Proceed for replacement of grease.
Grease replenishment
CAUTION:
Before replenishing the grease, turn the
power off and pull out the power plug.
(1) Disassemble the oil cap and thoroughly wipe
off the old grease inside. (FIg. 19)
(2) Supply 17.5g (the standard volume to cover
the connecting rod) of Hitachi Electric Hammer
Grease A in the crank case.
(3) After replacing the grease, reassemble the oil
cap securely. At this time, do not damage or
lose the O-Ring.
NOTE: The HITACHI Electric Hammer Grease A is of the lower viscosity type. When the
supplied grease tube is consumed, purchase from a HITACHI Autorized Service
Center.
6. Service and repairs
All quality power tools will eventually require servicing or replacement of parts because
of wear from normal use. To assure that only authorized replacement parts will be
used, all service and repairs must be performed by a HITACHI AUTHORIZED SERVICE
CENTER, ONLY.
18
Oil cap
Fig. 19
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