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English
APPLICATIONS
Demolishing concrete, chiseling off concrete, grooving, bar
cutting.
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
works.
SPECIFICATIONS
The specifi cations of this machine are listed in the Table on
page 104.
NOTE
Due to HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
MOUNTING AND OPERATION
Action
Inserting SDS-max tools
Removing SDS-max tools
Deciding working position of tool
Adujsting the side handle position
Switch operation
Locking-on the On / Off switch
Releasing the On / Off switch
About the power lamp
Speed change
How to use the demolition hammer*
Selecting accessories
* Operate this Demolition Hammer by utilizing its empty
weight. The performance will not be better even if it is
pressed or thrust forcibly against the work surface.
Hold this Demolition Hammer with a force just suffi cient
to counteract the reaction.
CAUTION
After long time of use, the housing becomes hot.
Therefore, be careful not to burn your hands.
Warming up (Fig. 11)
The grease lubrication system in this unit may require
warming up in cold regions.
Position the end of the bit so makes contact with the
concrete, turn on the switch and perform the warming
up operation. Make sure that a hitting sound is produced
and then use the unit.
ABOUT THE PROTECTION
FUNCTION
This tool has a built-in protection circuit for preventing
damage to the unit in the event of an abnormality. Depending
on the nature of the abnormality, the display lamp will fl ash
as shown in Table 1 and the unit will cease to operate. In
such cases, verify the problem indicated by the fl ashing and
take whatever steps are necessary to correct the problem.
NOTE
Repair may be required if the display lamp continues to
fl ash after taking all necessary steps to correct the problem.
If the problem persists, please arrange for repairs.
Display
lamp
fl ashing
Flash
Flash
Figure
Page
105
1
Flash
105
2
105
3
105
4
105
5
Flash
106
6
106
7
106
8
106
9
GREASE REPLACEMENT
107
10
This Demolition Hammer is of full air-tight construction to
108
―
protect against dust and to prevent lubricant leakage.
Therefore, this Demolition Hammer can be used without
lubrication for long periods. Replace the grease as described
below.
Grease Replacement Period
After purchase, replace grease after every 6 months of
usage. Ask for grease replacement at the nearest authorized
Service Center.
MAINTENANCE AND INSPECTION
CAUTION
Be sure to switch OFF and disconnect the attachment
plug from the receptacle to avoid a serious accident.
1. Inspecting accessories
Since use of a dull accessory, such as a bull point, a
cutter, etc. will degrade effi ciency and cause possible
motor malfunction, sharpen or replace with a new one 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
Table 1
Cause
Internal temperature
Turn off the unit
has risen beyond
and allow it to cool
the unit's specifi ed
down for about 15 to
temperature.
30 minutes.
(Temperature
When the temperature
increase protection
goes down, press the
function)
impact rate selector
switch to recover.
Excessive pressure
Press the impact rate
applied to the tool
selector switch to
has resulted in an
recover. Try to avoid
overload.
tasks that will apply
(Overload
excess pressure to
protection function)
the unit.
Tool is connected
Connect the unit to a
to a power source
power supply matching
whose voltage is
the input voltage
either too high or
specifi ed on the
too low.
nameplate. Press the
(Circuit protection
impact rate selector
function)
switch to recover.
Sensor signal read
Press the impact rate
error.
selector switch to
(Control monitoring
recover. Repair may
function)
be required if this error
continuously occurs.
Solution
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