Hitachi G13YC [7/49] English
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Hitachi G13YC [7/49] English

Hitachi G13YC [7/49] English
6
English
5. Ensure that mounted wheels and points are fitted
in accordance with the manufacturer’s instructions.
Ensure that the depressed center wheel to be utilized
is the correct type and free of cracks or surface
defects. Also ensure that the depressed center wheel
is properly mounted and the wheel nut is securely
tightened, Refer to the section on “Depressed Center
Wheel Assembly”
Ensure that blotters are used when they are provided
with the bonded abrasive product and when they
are required.
Do not use separate reducing bushings or adaptors
to adapt large hole abrasive wheels.
For tools intended to be fitted with threaded hole
wheel, ensure that the thread in the wheel is long
enough to accept the spindle length.
Do not use cutting off wheel for side grinding.
6. Conducting a trial run
Ensure that the abrasive products is correctly
mounted and tightened before use and run the tool
at no-load for 30 seconds in a safe position, stop
immediately if there is considerable vibration or if
other defects are detected.
If this condition occurs, check the machine to
determine the cause.
7. Confirm the spindle lock mechanism.
Confirm that the spindle lock is disengaged by
pushing push button two or three times before
switching the power tool on (See Fig. 1).
8. Fixing the side handle
Screw the side handle into the gear cover.
PRACTICAL GRINDER APPLICATION
1. Grinding Pressure
Do not apply the depressed center wheel strongly
to the grinding surface. The grinder makes use of
electronic cricuit, so during application of load rotates
at high speed, so ample grinding effect can be
obtained by applying light pressure. If a strong
grinding pressure or other abnormal load is applied,
the overload protection circuit will operate and make
the grinder stop rotating, so please stop applying
load immediately. Following this, switching the
power OFF and then ON again, will cause the rotation
to increase to the regular speed.
2. Grinding angle
Do not apply the entire surface of the depressed
center wheel to the material to be ground. As
shown in Fig. 3, the machine should be held at an
angle of 15° – 30° so that the external edge of the
depressed center wheel contacts the material at an
optimum angle.
3. To prevent a new depressed center wheel from
digging into the workpiece, initial grinding should
be performed by drawing the grinder across the
workpiece toward the operator (Fig. 3 direction B).
Once the leading edge of the depressed center
wheel is properly abraded, grinding may be
conducted in either direction.
4. Switch operation
[When the switch has locking mechanism]
Switch ON: To switch on, slide the lock lever in
the direction of A and press the paddle
lever in the direction of B as shown
in Fig. 4-a.
Furthermore, slide the lock lever in the
direction of C shown in Fig. 4-b while
pressing the paddle lever to lock and
enable continuous operation.
Switch OFF: To release the locking mode, press the
paddle lever in the direction of B
shown in Fig. 4-a, and release the
paddle lever to switch off.
[When the switch has no locking mechanism]
To switch on, slide the lock lever in the direction
of A and press the paddle lever in the direction
of B as shown in Fig. 4-a. Release the paddle lever
to switch off.
NOTE: The paddle lever can not be locked.
5. Precautions immediately after finishing operation
The wheel continues to rotate after the tool is
switched off.
After switching off the machine, do not put it down
until the depressed center wheel has come to a
complete stop. Apart from avoiding serious
accidents, this precaution will reduce the amount
of dust and swarf sucked into the machine.
CAUTIONS
䡬 Check that the work piece is properly supported.
䡬 Ensure that ventilation openings are kept clear when
working in dusty conditions.
If it should become necessary to clear dust, first
disconnect the tool from the mains supply (use non-
metallic objects) and avoid damaging internal parts.
䡬 Ensure that sparks resulting from use do not create
a hazard e.g. do not hit persons, or ignite flammable
substances.
䡬 Always use protective safety glasses and hearing
protectors, use other personal protective equipment
such as gloves, apron and helmet when necessary.
䡬 Always use eye and ear protection.
Other personal protective equipment such as dust
mask, gloves, helmet and apron should be worn
when necessary.
If in doubt, wear the protective equipment.
䡬 When the machine is not use, the power source
should be disconnected.
ASSEMBLING AND DISASSEMBLING THE
DEPRESSED CENTER WHEEL (Fig. 1)
CAUTION Be sure to switch OFF and disconnect the
attachment plug from the receptacle to avoid
a serious accident.
1. Assembling (Fig. 1)
(1) Turn the disc grinder upsidedown so that the spindle
is facing upward.
(2) Align the across flats of the wheel washer with the
notched part of the spindle, then attach them.
(3) Fit the protuberance of the depressed center wheel
or diamond wheel onto the wheel washer.
(4) Screw the wheel nut onto the spindle.
(For diamond wheel assembling, use the wheel nut
with the convex side against the diamond wheel).
(5) While pushing the push button with one hand, lock
the spindle by turning the depressed center wheel
slowly with the other hand.
Tighten the wheel nut by using the supplied wrench
as shown in Fig. 1.

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