Hitachi H 90SG Safety Instructions And Instruction Manual page 11

6. Grease replacement
This demolition hammer is of fully oil sealed
construction to protect against dust incursion and
to prevent lubricant leakage. This demolition
hammer 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.
Grease Replacement Period
Inspect the grease amount according to the timing
replacement period of the carbon brush. (See item
4 in the section MAINTENANCE AND INSPECTION.)
Ask for grease replacement at the nearest authorized
service center.
NOTE:
The Hitachi Electric Hammer Grease A is of the low
viscosity type. When the grease is consumed,
purchase from the authorized service center.
Do not excessively supply the designated amount
of grease. Otherwise, this demolition hammer
should not operate accurately.
7. 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 authorized service
center, ONLY.
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