12
English
Cotter
Rests
Taper shank adaptor
Fig. 17
MAINTENANCE AND INSPECTION
WARNING: Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance
and inspection.
1. Inspecting the drill bits
Since use of a dull tool will cause motor
malfunctioning and degraded efficiency, replace the
drill bit with a new one or resharpening without
delay when abrasion is noted.
2. Inspecting the screws
Regularly inspect all screws and ensure that they
are properly tightened. Should any of the screws
be loosened, retighten them immediately.
WARNING: Using this rotary hammer with
loosen screws is extremely
dangerous.
3. Maintenance of the motor
The motor unit winding is the very “heart” of the
power tool. Exercise due care to ensure the winding
does not become damaged and/or wet with oil or
water.
4. Inspecting the carbon brushes
For your continued safety and electrical shock
protection, carbon brush inspection and
replacement on this tool should ONLY be performed
by a Hitachi Authorized Service Center.
5. How to replace grease
Low viscosity grease is applied to this rotary
hammer so that it can be used for a long period
without replacing the grease. Please contact the
nearest service center for grease replacement when
any grease is leaking from loosened screw. Further
use of the rotary hammer despite the grease
shortage causes seizure to reduce the service life.
CAUTION: A specific grease is used with this
machine, therefore, the normal
performance of the machine may be
badly affected by use of other
grease. Please be sure to let one of
our service agents undertake
replacement of the grease.
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.
01Eng_DH22PH_US
1/22/09, 21:31
12
