How To Replace Grease; Maintenance And Inspection - Hitachi Koki DH 45MR Instrucciones De Manejo

(b) A drill can snap sometimes when drilling is almost
fi nished. It is important to relax your thrusting pressure
when drilling is nearing the end.
HOW TO HANDLE A CORE BIT
When a core bit is used, large diameter holes and blind holes
can be drilled. In this case, use optional accessories for
core bits (such as a center pin and core bit shank) for more
effi cient operation.
1. Mounting
CAUTION
Prior to mounting a core bit, always disconnect the plug
from the power supply receptacle.
(1) Mount the core bit on the core bit shank. (Fig. 15)
Before that, feed oil to the screw portion of core bit shank
for easy dismounting.
(2) Mount the core bit shank on the main body in the same
manner as in mounting the drill bit and the bull point.
(Fig. 16)
(3) Insert the center pin into the guide plate until it reaches
the extremity.
(4) Fit in the guide plate by aligning its concaved portion with
the core bit tip. When the position of the concave is shifted
by turning the guide plate right or left, the guide plate never
slips off even when the drill is used in a downward direction.
(Fig. 17)
2. Drilling holes
(1) Insert the plug into a receptacle.
(2) A spring is built in the center pin. By straightly and gently
pressing it to the wall or fl oor surface, the entire surface
of the core bit tip attains contact to start the hole drilling
job. (Fig. 18)
(3) When the hole depth reaches approximately 5 mm, the
hole position can be determined. Then remove the center
pin and guide plate from the core bit and continue the
hole drilling job.
CAUTION
When removing the center pin and guide plate, always
disconnect the plug from the receptacle.
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. 19)
○ 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. 20)

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. 21)
(2) Supply 30 g of Hitachi Electric Hammer Grease A
(Standard accessory, contained in tube) to the crank
case.
(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
A: Item No.
B: Code No.
C: No. Used
D: Remarks
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.
Modifi cation
Hitachi Power Tools are constantly being improved
and modifi ed to incorporate the latest technological
advancements.
Accordingly, some parts (i.e. code numbers and/or
design) may be changed without prior notice.
NOTE
Due to HITACHI's continuing program of research and
development, the specifi cations herein are subject to change
without prior notice.
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