Hitachi H25PV-NA [7/44] English
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Hitachi H25PV-NA [7/44] English

Hitachi H25PV-NA [7/44] English
6
English
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 change 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 Hitachi Electric 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. 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.
(1) Clean the shank portion of the tool.
(2) As shown in Fig. 1, pull grip in the direction of A,
and insert the tool into a hole of the front cap.
(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 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.
01Eng_H25PV_EE 08/12/10, 13:516

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English 1 Clean the shank portion of the tool 2 As shown in Fig 1 pull grip in the direction of and insert the tool into a hole of the front cap 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 GREASE REPLACEMENT 5 Deciding Working Position of Tool 1 Grease Replacement Period The tool can be turned every 45 degrees and can be fixed at the position of 8 steps 11 As shown in Fig 3 if the grip is turned in the direction of in a state where the lock sleeve is pushed in the direction of A the blade anglecan be changedfreely 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 a mount 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 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 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 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 crankcase 3 After replacing the grease install the crankcase 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 a Hitachi Authorized Service Center MAINTENANCE AND INSPECTION CAUTION To prevent accidents make sure to turn off and disconnect the plug from the receptacle the switch 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 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 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 6

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