Manual Hitachi G13YF (page 9 of 68) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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⅜ After adjustment, if grinder operation is required,

perform the operation only after setting the lever

in closed position.

⅜ Lubricate the sliding section of the set piece (B) and

the lever if the lever does not move smoothly.

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 “ASSEMBLING

AND DISASSEMBLING ACCESSORIES”.

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 push button.

Confirm that the push button 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.

9. Adjusting the number of revolution (G12VA, G13VA,

G15VA)

Above models are equipped with an electronic

infinite-variable-speed drive and can change the

number of revolution according to a use.

If you turn and set the dial scale (Fig. 4) to 6, the

number of revolution increases, and if you turn and

set it to 1, the number of revolution decreases.

Before use, set the number of revolution using the

dial. In so doing, refer to the following table as

a rough guide.

NOTE: Use caution not to turn the dial scale to any value

below 1 or above 6.

10. Caution when using near welding equipment

When using the grinder in the immediate vicinity

of welding equipment, the rotational speed may

become unstable. Do not use the grinder near

welding equipment.

PRACTICAL GRINDER APPLICATION

1. Pressure

Do not apply the grinding wheel strongly to the

grinding surface. The grinder makes use of electronic

circuit, 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.

CAUTION: (G12VA, G13VA, G15VA)

When using the tool at any value except the full

speed (Dial scale 6), the motor cannot be sufficiently

cooled due to the decreased number of revolution.

This could result in the risk of burning and damaging

the motor before an overload protective mechanism

starts to function.

Make sure that you use the tool by lightly applying

it to the surface of material when you use it at any

value except the full speed (Dial scale 6).

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. 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

⅜ Check that the work piece is properly supported.

⅜ 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.

⅜ Ensure that sparks resulting from use do not create

a hazard e.g. do not hit persons, or ignite flammable

substances.

Dial Use Tools

1 Polishing, finishing

Removal of paint or

coat

3 Removal of rust

4 Removal of burrs

Grinding

Rough grinding

6 Cutting

Radial grinding disc

Sanding disc

Depressed center

wheel

Depressed center

wheel

Diamond wheel

01Eng_G12VA_WE 4/20/10, 17:358

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Hitachi G13YF Manual

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