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(2) Turn on the switch when the diamond wheel is not
touching the material to be cut.
CAUTION
䡬
Always check the diamond wheel before starting
work. Never use a diamond wheel which is cracked,
broken or bent.
䡬
Do not apply water or coolant to the diamond
wheel.
䡬
Start cutting only when diamond wheel reaches its
maximum speed.
䡬
Switching the tool on and off repeatedly within a
short time may cause burn damage of the motor.
䡬
If the diamond wheel seizes or there is any abnormal
noise, immediately turn the power off.
䡬
Never use the diamond wheel to cut zigzag or curved
lines. Never use the side surface of the diamond
wheel. Never use to perform inclination cutting.
䡬
If excessive force is applied to the diamond wheel
to make it align with the premarked line during
cutting, this might not only overload the motor and
cause burn damage but may also overheat the
diamond wheel and shorten the service life.
䡬
Secure the workpiece. A workpiece clamped with
clamping devices or in a vice is held more securely
than by hand.
䡬
Take care not to allow the power cord to come into
contact with the diamond wheel during operation.
䡬
When the work is completed, turn the power off and
disconnect the power plug from the receptacle.
MAINTENANCE AND INSPECTION
1. Inspection the diamond wheel
A worn diamond wheel overloads the motor and
reduces working efficiency. Replace with a new one.
2. Diamond wheel clogging
The rate of wear of the diamond layer cutting edge
will vary depending on the type of material being
cut, the cutting speed, etc. In general, materials which
produce granular cutting particles may scrape the
bodying agent and hasten the wear of the diamond
layer. On the other hand, materials which produce
powdery cutting particles may cause clogging of the
diamond layer which will reduce cutting efficiency.
When clogging occurs, additional force applied in an
attempt to increase cutting speed will sometime cause
sparks to appear around the circumference of the
diamond wheel. In such a case, stop using the cutter
and carefully inspect the cutting edge by rubbing it
with your fingers. If the diamond layer feels smooth
(no roughness or abrasiveness), it is clogged with
dust and must be “dressed”.
For thorough dressing, approximately 5 meters of
slightly accelerated cutting at a depth of 10mm in
a relative soft material which produces granular cutting
particles (such as a cement block or brick) will restore
the cutting effectiveness of the diamond layer and
will extend the service life of the diamond wheel.
The diamond material is susceptible to high
temperatures and will begin to deteriorate at
approximately 600°C. Higher temperatures will cause
decomposition of the diamond material. Accordingly,
it is important to perform “dressing” as soon as
clogging or sparking occurs.
3. 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.
4. 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.
5. Inspecting the carbon brushes (Fig. 8)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brush with a new one having the same carbon
brush numbers shown in the figure when it becomes
worn to or near the “wear limit”. In addition, always
keep carbon brushes clean and ensure that they
slide freely within the brush holders.
6. Replacing a carbon brush
Disassemble the brush cap with a minus-head
screwdriver. The carbon brush can then be easily
removed.
7. Service parts list
A: Item No.
B: Code No.
C: No. Used
D: Remarks
CAUTION
Repair, modification and inspection of Hitachi Power
Tools must be carried out by a 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 (i.e. code numbers and/or
design) may be changed without prior notice.
GUARANTEE
We guarantee Hitachi Power Tools in accordance with
statutory/country specific regulation. This guarantee does
not cover defects or damage due to misuse, abuse, or
normal wear and tear. In case of complaint, please send
the Power Tool, undismantled, with the GUARANTEE
CERTIFICATE found at the end of this Handling instruction,
to a Hitachi Authorized Service Center.
NOTE
Due to HITACHI’s continuing program of research and
development, the specifications herein are subject to
change without prior notice.
01Eng_CM12Y_WE
7/29/13, 3:10 PM
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