How To Replace Grease; Maintenance And Inspection - Hitachi DH 38MS Handling Instructions Manual

3. How to dismount the core bit
○ By holding the rotary hammer (with the core bit inserted)
in an upward position, drive the rotary hammer to repeat
impact operation two or three times, whereby the screw
is loosened and the rotary hammer becomes ready for
disassembly. (Fig. 17)
○ Remove the core bit shank from the rotary hammer, hold
the core bit with one hand, and strongly strike the head
of the SDS max shank portion of the core bit shank with
a manual hammer two or three times, whereby the round
head screw is loosened and the rotary hammer is ready
for disassembly. (Fig. 18)
Core bit shank
Core bit

HOW TO REPLACE GREASE

This machine is of 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.
1. Grease replacement period
After purchase, replace grease after every 6 months of
usage. Ask for grease replacement at the nearest Hitachi
Authorized Service Center. Proceed for replacement of
grease.
2. Grease replenishment
CAUTION
Before replenishing the grease, turn the power off and
pull out the power plug.
(1) Remove the crank cover and wipe off the grease inside.
(Fig. 19)
(2) Supply 60 g of Hitachi Electric Hammer Grease A
(Standard accessory, contained in tube) to the crank
case.
8
Core bit
Core bit shank
Fig. 17
Fig. 18
(3) After replenishing the grease, install the crank cover
securely.
NOTE
The Hitachi Electric Hammer Grease A is of the low
viscosity type. If necessary purchase from an Hitachi
Authorized Service Center.

MAINTENANCE AND INSPECTION

1. Inspecting the tool
Since use of a dull tool will degrade effi ciency 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
loose, retighten them immediately. Failure to do so could
result in serious hazard.
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. Replacing supply cord
If the supply cord of Tool is damaged, the Tool must be
returned to Hitachi Authorized Service Center for the
cord to be replaced.
6. Service parts list
CAUTION
Repair, modifi cation and inspection of Hitachi Power
Tools must be carried out by a Hitachi Authorized Service
Center.
This Parts List will be helpful if presented with the tool to
the Hitachi Authorized Service Center when requesting
repair or other maintenance.
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
MODIFICATION
Hitachi Power Tools are constantly being improved
and modifi ed to incorporate the latest technological
advancements.
Accordingly, some parts may be changed without prior
notice.
NOTE
Due HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
Crank cover
Fig. 19