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

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4. 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.
5. Mounting the diamond wheel
For details, refer to the item "Mounting and dis-
mounting the diamond wheel".
6. Confirm that the cutting depth adjusting lever is
securely clamped.
7. 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.
HOW TO USE THE WATER SUPPLY UNIT
CAUTION
To cut or scribe concrete, tile, or stone, operate the
equipment while pouring water.
1. Attachment of the water plug
(1) Loosen the wing bolt for cutting depth adjustment,
and fully lower the base and fasten it with the wing
bolt. (Fig. 1, 2)
(2) Pass the water plug through the inner side of the
cutting depth adjustment link as shown in Fig. 2,
and fasten it to the water plug installation seat of
the gear cover with the machine screw. (Fig. 2)
(3) Attach the vinyl hose to the water plug vinyl hose
attachment opening.
2. Water volume control
Regulate the water volume by turning the water
plug lever to the left and right.
When turning the lever toward the vinyl hose at-
tachment opening side, the water outlet will be fully
opened (maximum water volume ), and when turning
it 90° to the left, it will be fully closed.
3. When using city water
(1) Insert the water plug into the provided vinyl hose.
(2) Install the rubber connector on a faucet and fit the
vinyl hose to the rubber connector.
(3) Open the faucet to an extent that the rubber con-
nector will not become disconnected; adjust the
flow rate with the lever on the water plug (Fig. 3)
4. When using a water tank
The water tank should be located 80cm or more
above the working surface (Fig. 4)
5
MOUNTING AND DISMOUNTING THE
DIAMOND WHEEL
CAUTIONS
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. 5, 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 re-
move the bolt. (Fig. 6)
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. 7)
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.