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2. Power source
Ensure that the power source to be utilized conforms to the
power requirements specifi ed on the product nameplate.
3. 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, and can cause serious injury.
4. Extension cord
When the work area is far away from the power source,
use an extension cord of suffi cient thickness and rated
capacity. The extension cord should be kept as short as
practicable.
5. Mounting the diamond wheel
For details, refer to the item "Mounting and dismounting
the diamond wheel".
6. Confi rm that the cutting depth adjusting lever is
securely clamped.
7. Cutting depth adjustment (Fig. 1)
○ Loosen the cutting depth adjusting wing bolt and move
the base to adjust the depth.
○ Tighten the wing bolt securely after adjusting the
cutting depth.
CAUTION
○ Leaving the wing bolt loosened may result in injury.
Securely tighten the wing bolt after adjusting the cutting
depth.
○ When the cutting depth exceeds 20mm, concrete, and
so on must be cut in two steps. Never try to cut in one
step; otherwise, the motor is liable to be overloaded
and damaged may result. Also, cutting effi ciency will be
lower in such an instance.
MOUNTING AND DISMOUNTING THE
DIAMOND WHEEL
CAUTION
○ Be sure to disconnect the attachment plug from the
power receptacle to avoid serious trouble.
○ Stop pouring water and select a moisture-free location
for the operation mentioned above.
1. Mounting the diamond wheel
(1) Thoroughly remove dust accumulated on the spindle
and washers.
(2) As shown in Fig. 2, the concave portions of washers (A)
and (B) must be on the diamond wheel side.
(3) Thoroughly clamp the bolt.
2. Dismounting the diamond wheel
Use the provided wrenches to remove the bolt. (Fig. 3)
CAUTION
A diamond wheel for mounting on this equipment must
have 20mm internal diameter. No other sized diamond
wheel should be used.
CUTTING PROCEDURES
1. Set the machine body (base) on the material to be cut;
use the side on the base to align the diamond wheel
with the cutting line. (Fig. 4)
2. Turn the switch ON with the diamond wheel initially kept
off the material to be cut.
The power switch is turned ON when the trigger is
pulled by one's fi nger, and is turned OFF when the
trigger is released. The stopper is designed to prevent
inadvertent operation of the machine and the trigger will
not operate unless the stopper has fi rst been pushed in.
6
Turn the machine ON with the diamond wheel initially
kept off the material to be cut. The power switch is
turned ON by fi rst depressing and holding down the
stopper, and then pulling the trigger with one's fi nger.
Once the trigger is ON, the stopper may be released
and the tool may be operated by continuing to hold
the trigger. The power switch is turned OFF when the
trigger is released.
CAUTION
○ Do NOT use the diamond wheel for cutting along curves
or at angles; otherwise, it may be damaged, resulting in
extremely shortened service life.
○ Before starting to cut, confi rm that the diamond wheel
has attained full-speed revolution.
○ Should the diamond wheel stop or make an abnormal
noise while operating, promptly turn OFF the switch.
○ Always take care in preventing the power cord from
coming near to the revolving diamond wheel.
○ When fi nished with a job, pull out the plug from the
power receptacle.
MAINTENANCE AND INSPECTION
CAUTION
Be sure to switch power OFF and disconnect the
plug from the receptacle during maintenance and
inspection.
Using cracked, deformed or damaged wheels can lead
to wheel breakage and resulting serious injury.
1. Inspecting the diamond wheel
Since use of a dull diamond wheel will cause motor
malfunctioning and degraded effi ciently, replace with a
new one without delay when abrasion is noted.
2. Inspecting the mounting screws
Regularly inspect all screws and ensure that they are
fully tightened. Should any of the screws be loosened,
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. 5)
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
No. shown in the fi gure 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.
5. Replacing carbon brushes
Remove the brush caps and carbon brushes. After
replacing the carbon brushes, do not forget to tighten
the brush caps properly.
6. Service parts list
CAUTION
Repair, modifi cation and inspection of Hitachi Power
Tools must be carried out by an 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.
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