Hitachi DH24PM [14/76] English
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Hitachi DH24PM [14/76] English

Hitachi DH24PM [14/76] English
English
13
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 efficiency, 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 (Fig. 23)
The motor employs carbon brushes which are
consumable parts. When they become worn to or
near “wear limit”, it could result in motor trouble.
When an auto-stop carbon brush is equipped, the
motor will stop automatically.
At that time, replace both carbon brushes with new
ones which have the same carbon brush numbers
shown in Fig. 23.
In addition, always keep carbon brushes clean and
ensure that they slide freely within the brush holders.
5. Replacing a carbon brush (Fig. 24)
Disassembling
(1) Loosen the three screws on the handle cover, and
remove the handle cover.
(2) Lift out the brush holder together with the carbon
brush, while being very careful not to forcibly pull
the lead wires within the brush holder.
(3) Withdraw the brush terminal, and remove the carbon
brush from the brush holder.
Reassembling
(1) Place a new carbon brush into the brush holder, and
connect the brush terminal to the carbon brush.
(2) Return the brush holder and other parts to their
original positions, as illustrated in Fig. 24.
(3) Place the lead wire in the specified position. Be very
careful not to allow the lead wire to contact the
armature or rotating parts of the motor.
(4) Replace the handle cover, while being careful to
ensure it does not pinch the lead wire, and secure it
firmly with the three screws.
CAUTION
Should the lead wire be pinched by the handle cover
or come in contact with the armature or rotating
parts of the motor, a serious danger of electric shock
to the operator will be created. Excercise extreme
caution in disassembling and reassembling the motor,
following the above procedures exactly.
Do not attempt to disassemble any parts other than
those necessary to effect replacement of the carbon
brush.
6. 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.
7. Service parts list
CAUTION
Repair, modification 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 modified to incorporate the latest technological
advancements.
Accordingly, some parts may be changed without
prior notice.
GUARANTEE
We guarantee Hitachi Power Tools in accordance with
statutory/country specific regulation. This guarantee does
not cover defects or damage due to misuse, abuse, or
normal wear and tear. In case of complaint, please send
the Power Tool, undismantled, with the GUARANTEE
CERTIFICATE found at the end of this Handling
instruction, to a Hitachi Authorized Service Center.
NOTE
Due to HITACHI’s continuing program of research and
development, the specifications herein are subject to
change without prior notice.
Information concerning airborne noise and vibration
The measured values were determined according to
EN60745 and declared in accordance with ISO 4871.
Measured A-weighted sound power level: 103 dB (A)
Measured A-weighted sound pressure level: 90 dB (A)
Uncertainty KpA: 3 dB (A).
Wear ear protection.
The typical weighted root mean square acceleration
value: 15.7 m/s
2
.

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