Hitachi H 25PV, Handling Instructions Manual

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5
English
(3) After replacing the grease, install the crank case cover
securely. At this time, do not damage or lose the oil
seal.
NOTE:
The Hitachi Electric Hammer Grease A is of the low
viscosity type. When the grease is consumed,
purchase from an authorized Hitachi Service
Center.
MAINTENANCE AND INSPECTION
CAUTION:
To prevent accidents, make sure to turn the switch
off and disconnect the plug from the receptacle.
1. Inspecting the tool
Since use of a dull tool will degrade efficiency 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 (Fig. 7)
The Motor employs carbon brushes which are
consumable parts. When they become worn to or
near the “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 the figure. In
addition, always keep carbon brushes clean and
ensure that they slide freely within the brush holders.
5. Replacing carbon brushes
Loosen the set screw and remove the tail cover.
Remove the brush caps and carbon brushes. After
replacing the carbon brushes, do not forget to tighten
the brush caps securely and to install the tail cover.
6. Service parts list
CAUTION:
Repair, modification and inspection of Hitachi Power
Tools must be carried out by an 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.
MODIFICATIONS:
Hitachi Power Tools are constantly being improved
and modified to incorporate the latest technological
advancements.
Accordingly, some parts may be changed without
prior notice.
HOW TO USE THE SWITCH
CAUTION:
To prevent accidents, make sure to turn the switch
off and disconnect the plug from the receptacle when
the tools are installed or removed. The power switch
should also be turned off during a work break and
after work.
When the trigger is depressed, the tool rotates. When
the trigger is released, the tool stops. The impact rate
can be controlled by varying the amount that the trigger
switch is pulled. Impact rate is low when the trigger
switch is pulled slightly and increases as the trigger
switch is pulled more.
The desired rotation speed can be pre-selected with the
speed control dial.
Turn the speed control dial clockwise for higher impact
rate and counterclockwise for lower impact rate.
(
Fig. 4 )
Pulling the trigger and pushing the stopper, it keeps the
switched-on condition which is convenient for continuous
running. When switching off, the stopper can be
disconnected by pulling the trigger again.
HOW TO USE THE DEMOLITION HAMMER (Fig. 5)
1. After placing the tip of the tool on concrete surface,
switch ON.
The switch can be turned ON if the trigger is pulled
and OFF when it is released.
Impact rate of the tool can be controlled steplessly by
varying the amount that the trigger switch is pulled.
2. By utilizing the empty weight of the machine and by
firmly holding the hammer with both hands, one can
effectively control the subsequent recoil motion.
Proceed at a moderate work-rate, the use of too
much force will impair efficiency.
GREASE REPLACEMENT
This machine is of full air-tight construction to protect
against dust and to prevent lubricant leakage. This
machine can be used without greg|e supplement for an
extended period of time. However, perform the grease
replacement to maintain the service life. Replace the
grease as described below.
1. Grease Replacement Period
You should look at the grease when you change the
carbon brush. (See item 4 in the section
MAINTENANCE AND INSPECTION.) Ask for grease
replacement at the nearest authorized Hitachi Service
Center.
In the case that you are forced to change the grease
by yourself, please follow the following points.
2. How to replace grease
CAUTION:
Before replacing the grease, turn the power off and
pull out the plug from the receptacle.
(1) Remove the crank case cover and wipe off the old
grease inside. ( Fig. 6 )
(2) Supply 25 g (the standard volume to cover the
connecting rod) of Hitachi Electric Hammer Grease A
in the crank case.