Cutting Procedures; Prior To Operation; Mounting And Dismounting The Diamond Wheel; Maintenance And Inspection - Hitachi CM 4SB2 Handling Instructions Manual

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APPLICATIONS
Cutting and scribing of concrete.
Cutting and scribing various types of stones.
Cutting and scribing various types of tiles.

PRIOR TO OPERATION

1. Power source
Ensure that the power source to be utilized con-
forms 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, which could cause
a 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. Mounting the diamond wheel
For details, refer to the item "Mounting and dis-
mounting the diamond wheel".
5. Confirm that the cutting depth adjusting lever is
securely clamped.
6. Cutting depth adjustment (Fig. 1)
Lowering the lever will loosen and raising it will
tighten. Loosening the lever and moving the base
will allow adjustment of the cutting depth.
CAUTIONS
Leaving the lever loosened may result in injury.
Securely tighten the lever 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 damage may result. Also, cut-
ting efficiency will be lowered in such an instance.
MOUNTING AND DISMOUNTING THE
DIAMOND WHEEL
CAUTIONS
Be sure to disconnect the attachment plug from the
power receptacle to avoid serious trouble.
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 wrench and box wrench to
remove the bolt. (Fig. 3)
CAUTIONS
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 finger, and is turned OFF when
the trigger is released. If the stopper is depressed
after the trigger is pulled, the power switch be-
comes locked, even though the trigger is released,
proving particularly convenient for continuous
operation. When the power switch is to be turned
OFF, the stopper can be released by pulling the
trigger, and the power switch is turned OFF upon
releasing the trigger.
CAUTIONS
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, confirm that the diamond
wheel has attained full-speed revolution.
Should the diamond wheel stop or make an abnor-
mal 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 finished with a job, pull out the plug from
the power receptacle.

MAINTENANCE AND INSPECTION

1. Inspecting the diamond wheel
Since use of a dull diamond wheel will cause
motor malfunctioning and degraded efficiently,
replace with a new one without delay when
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. Fail-
ure 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 car-
bon brush can result in motor trouble, replace the
carbon brush with a new one having the same
carbon brush No. 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.
5. Replacing carbon brushes
Loosen the set screw and remove the tail cover.
Remove the brush caps and carbon brushes. After
replacing the carbon brushes, do not forget to
tighten the brush caps securely and to install the
tail cover.