Bedienungsanleitung Hitachi g 12 sr3 (Seite 23 von 29) (Englisch, Dänisch, Schwedisch, Norwegisch, Finnisch)

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PRACTICAL GRINDER APPLICATION

1. Pressure

To prolong the life of the machine and ensure a

first class finish, it is important that the machine

should not be overloaded by applying too much

pressure. In most applications, the weight of the

machine alone is sufficient for effective grinding.

Too much pressure will result in reduced rotational

speed, inferior surface finish, and overloading which

could reduce the life of the machine.

2. Grinding angle

Do not apply the entire surface of the depressed

center wheel to the material to be ground. As

shown in Fig. 1, 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. 1 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.

CAUTION

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 neccessary 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.

⅜ Always use protective safety glasses and hearing

protectors, use other personal protective equipment

such as gloves, apron and helmet when necessary.

⅜ 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.

⅜ When the machine is not in use, the power source

should be disconnected.

ASSEMBLING AND DISASSEMBLING THE

DEPRESSED CENTER WHEEL (Fig. 2)

CAUTION: Be sure to switch OFF and disconnect the

attachment plug from the receptacle to avoid

a serious accident.

1. Assembling (Fig. 2)

(1) Turn the equipment upsidedown so that the

spindle will be facing up.

(2) Mount the wheel washer onto the spindle.

(3) Fit the protuberance of the depressed center wheel

onto the wheel washer.

(4) Screw from above the wheel nut onto the spindle.

(5) As shown in Fig. 2, push in the push button to

prevent rotation of the spindle. Then, secure the

depressed center wheel by tightening the wheel

nut with the wrench.

2. Disassembling

Follow the above procedures in reverse.

CAUTIONS:

⅜ Comfirm that the depressed center wheel is mounted

firmly.

⅜ Confirm that the push button is disengaged by

pushing push button two or three times before

switching the power tool on.

MAINTENANCE AND INSPECTION

1. Inspecting the depressed center wheel

Ensure that the depressed center wheel is free of

cracks and surface defects.

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. Failure

to do so could result in serious hazard.

3. Inspecting the carbon brushes (Fig. 4)

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 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.

4. Replacing carbon brushes (Fig. 5):

(1) Loosen the D4 tapping screw retaining the tail cover

and remove the tail cover.

(2) Use the auxiliary hexagonal wrench or small

screwdriver to pull up the edge of the spring that

is holding down the carbon brush. Remove the

edge of the spring toward the outside of the brush

holder.

(3) Remove the end of the pig-tail on the carbon brush

from the terminal section of brush holder and then

remove the carbon brush from the brush holder.

(1) Insert the end of the pig-tail of the carbon brush

in the terminal section of brush holder.

(2) Insert the carbon brush in the brush holder.

(3) Use the auxiliary hexagonal wrench or small

screwdriver to return the edge of the spring to the

head of the carbon brush.

(4) Mount the tail cover and tighten the D4 tapping

screw.

5. 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.

6. Service parts list

A: Item No.

B: Code No.

C: No. Used

D: Remarks

CAUTION

Repair, modification and inspection of Hitachi Power

Tools must be carried out by an Hitachi Authorized

Service Center.

This Parts List will be helpful it presented with the

tool to the Hitachi Authorized Serivde Center when

requesting repair or other maintenance.

In the operation and maintenance of power tools,

Hitachi g 12 sr3 Seite 23

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