How To Use The Core Bit; Maintenance And Inspection - Hitachi DH 24PB3 Instructions Manual

HOW TO USE THE CORE BIT

(FOR LIGHT LOAD)
When boring penerating large holes use the core bit (for
light loads). At that time use with the center pin and the
core bit shank provided as optional accessories.
1. Mounting
CAUTION
Be sure to turn power OFF and disconnect the plug
from the receptacle.
(1) Mount the core bit to the core bit shank (Fig. 14).
Lubricate the thread of the core bit shank to facilitate
disassembly.
(2) Mount the core bit to the rotary hammer (Fig. 15).
(3) Insert the center pin into the guide plate until it
stops.
(4) Engage the guide plate with the core bit, and turn the
guide plate to the left or the right so that it does not
fall even if it faces downward (Fig. 16).
2. How to bore (Fig. 17)
(1) Connect the plug to the power source.
(2) A spring is installed in the center pin.
Push it lightly to the wall or the fl oor straight.
Connect the core bit tip fl ush to the surface and start
operating.
(3) When boring about 5 mm in depth the position of the
hole will be established. Bore after that removing the
center pin and the guide plate from core bit.
(4) Application of excessive force will not only expedite
the work, but will deteriorate the tip edge of the drill
bit, resulting in reduced service life of the rotary
hammer.
CAUTION
When removing the center pin and the guide plate,
turn OFF the switch and disconnect the plug from the
receptacle.
3. Dismounting (Fig. 18)
Remove the core bit shank from the rotary hammer
and strike the head of the core bit shank strongly two
or three times with a hammer holding the core bit,
then the thread becomes loose and the core bit can
be removed.
LUBRICATION
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 form
loosened screw.
Further use of the rotary hammer with lock off grease
will cause the machine to seize up reduce the service
life.
CAUTION
A special 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.

MAINTENANCE AND INSPECTION

1. Inspecting the drill bits
Since use of a dull tool will cause motor
malfunctioning and degraded effi ciency, replace the
drill bit with new ones or resharpen them without
delay when 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 to HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
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