Grease Replacement; Maintenance And Inspection - Hitachi H 25PV Handling Instructions Manual

(3) Adjust the groove position while turning the tool,
and furthermore insert it until it hits the end of the
hole.
(4) Return grip to its original position, pull the tool and
make sure it is locked completely (Fig. 2).
5. Deciding Working Position of Tool
The tool can be turned every 45 degrees and can be
fixed at the position of 8 steps.
(1) As shown in Fig. 3, if the grip is turned in the direction
of B in a state where the lock sleeve is pushed in the
direction of A, the blade angle can be changed freely
to any desired position.
(2) Release lock sleeve and turn the tool, and make sure
that it is locked completely.
6. Removing Tool
As shown in Fig. 1, pull grip, and pull out the tool.
CAUTION
Be sure to grip the handle and cylinder case cover
portion during work. Do not hold by the grip during
work. If you pull it by mistake, the bull point could
jump out.
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 weight of the machine and by firmly
holding the demolition 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 grease 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 changed the
carbon brush. (See item 4 in the section MAINTENANCE
AND INSPECTION.) Ask for grease replacement at the
nearest Hitachi Authorized 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.
(3) After replacing the grease, install the crank case cover
securely. At this time, do not damage or lose the oil
seal.
NOTE
The Hammer Grease A is of the low viscosity type.
When the grease is consumed, purchase from a
Hitachi Authorized Service Center.

MAINTENANCE AND INSPECTION

CAUTION
To prevent accidents, make sure to turn the switch off
and disconnect the plug from the receptacle.
1. Inspection 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 "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 Nos. shown in figure. In addition,
always keep carbon brushes clean and ensure that
they slide freely within the brushers.
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