Prior To Operation; Grease Replacement; Maintenance And Inspection - Hitachi H 45MR Handling Instructions Manual

APPLICATIONS
Breaking concrete, chipping off concrete, grooving, bar
cutting, and driving piles.
Application examples:
Installation of piping and wiring, sanitary facility
installation, machinery installation, water supply and
drainage work, interior jobs, harbor facilities and other
civil engineering work.

PRIOR TO OPERATION

1. Power source
Ensure that the power source to be utilized conforms
to the power requirements specified on the product
nameplate.
2. Power switch
Ensure that the power switch is in the OFF position. If
the plug is connected to a receptacle while the power
switch is in the ON position, the power tool will start
operating immediately, inviting serious accident.
3. Extension cord
When the work area is removed from the power
source, use an extension cord of sufficient thickness
and rated capacity. The extension cord should be
kept as short as practicable.
4. Installing Tools
CAUTION
Be sure to switch power OFF and disconnect the plug
from the receptacle to avoid serious trouble.
NOTE:
When using tools such as bull points, cutters, etc.,
make sure to use the genuine parts designated by
our company.
(1) Clean the shank portion of the tool.
(2) As shown in Fig. 1, pull grip (A) 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 (A) 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 30 degrees and can be
fixed at the position of 12 steps.
(1) As shown in Fig. 3, if the grip (A) is turned in the
direction of B in a state where the grip (B) is pushed
in the direction of A, the blade angle can be changed
freely to any desired position.
(2) Release grip (B) and turn the tool, and make sure that
it is locked completely.
6. Removing Tool
As shown in Fig. 1, pull grip (A), and pull out the tool.
CAUTION
Be sure to grip the handle and side handle or grip (C)
portion during work. Do not hold by the grip (A)
during work. If you pull it by mistake, the bull point
could jump out.
HOW TO USE THE DEMOLITION HAMMER (FIG. 4)
1. After placing the tip of the tool on concrete surface,
switch ON.
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.
CAUTION
After long time of use, the cylinder case becomes
hot. Therefore, be careful not to burn your hands.

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 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 cover and wipe off the grease
inside. (Fig. 5)
(2) Supply 40g of Hammer Grease A to the crank case.
(3) After replacing the grease, install the crank cover
securely.
NOTE:
The Hammer Grease A is of the low viscosity type.
When the grease is consumed, purchase from an
authorized Hitachi Service Center.

MAINTENANCE AND INSPECTION

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. 6)
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.
5. Replacing carbon brushes
Loosen the set screw and remove the tail cover.
Remove the brush caps and carbon brushes. After
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