Bedienungsanleitung Hitachi VTV-18A (Seite 6 von 41) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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8. Fixing the side handle:

Loosen the knob bolt on the side handle, and attach

the side handle to the gear cover in a position

convenient for drilling.

Match the projecting part of the handle to the groove

on the gear cover, and firmly tighten the knob bolt.

To remove the side handle, loosen the knob bolt

and rotate the handle.

To attach a depth stopper on the side handle, insert

the depth stopper into the U-shaped groove on the

side handle, adjust the position of the depth stopper

in accordance with the desired depth of the hole,

and firmly tighten the knob bolt.

PRACTICAL HANDLING PROCEDURES

1. Pressure:

Drilling will NOT be accelerated by placing heavy

pressure on the drill. Such action will only result in

a damaged drill bit, decreased drilling efficiency, and/

or shortened service life of the drill.

2. Using a large diameter drill bit:

When using the larger diameter drill bit, the larger

reactive force is applied on your arm. Be careful not

to lose control of the drill because of this reactive

force. To maintain firm control, establish a good

foothold, hold the drill tightly with both hands, and

ensure that the drill is vertical to the material being

drilled.

3. When drilling completely through the material:

When the drill bit bores completely through the

material, careless handling often results in a broken

drill bit or damage to the drill body itself due to the

sudden movement of the drill.

Always be alert and ready to release the pushing

force when penetrating the material.

4. Switch operation:

(1) VTP-18 :

By pulling the trigger switch and depressing the

stopper, the switch is held in the ON position for

continuous operation. To turn the drill OFF, pull the

trigger switch again and release.

(2) VTV-18 :

The rotational speed of the drill bit can be controlled

by varying the amount that the trigger switch is

pulled. Speed is low when the trigger switch is pulled

slightly and increases as the switch is pulled more.

Continuous operation may be attained by pulling

the trigger switch and depressing the stopper. To

turn the switch OFF, pull the trigger switch again to

disengage the stopper, and release the trigger switch

to its original position.

5. Precautions on Boring

The drill bit may become overheated during

operation; however, it is sufficiently operable. Do

not cool the drill bit in water or oil.

6. Caution concerning immediately after use

Immediately after use, while it is still revolving, if

the Drill is placed on a location where considerable

ground chips and dust have accumulated, dust may

occasionally be absorbed into the Drill mechanism.

Always pay attention to this possibility.

MAINTENANCE AND INSPECTION

1. Inspecting the Drill Bit:

Continued use of a worn and/or damaged drill bit

will result in reduced drilling efficiency and may

seriously overload the drill motor. Inspect the drill

bit often and replace it with a new bit as necessary.

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. 3)

The motor employs carbon brushes which are

consumable parts. Since excessively worn carbon

brushes can result in motor trouble, replace the

carbon brushes with new ones having the same

carbon brush No. shown in the figure when they

become 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:

⅜ Disassembling:

(1) Loosen the three screws on the handle cover, and

remove the handle cover. Remove the holder plates,

which keeps the brush holders in place, by removing

the stopper screws.

(2) Lift out the brush holders together with the carbon

brushes, while being very careful not to forcibly pull

the lead wires within the brush holders.

(3) Withdraw the brush terminals, and remove the

carbon brushes from the brush holders.

⅜ Reassembling:

(1) Place new carbon brushes into the brush holders,

and connect the brush terminals to the carbon

brushes.

(2) Return the brush holders and other parts to their

original positions, as illustrated in Fig. 4, press the

holder plates into position, and fasten it with the

stopper screws.

(3) Place the lead wire in the specified position.

Be very careful not to allow the lead wire to contact

the armature or rotating parts of the motor.

(4) Replace the handle cover, while being careful to

ensure it does not pinch the lead wire, and secure

it firmly with the three screws.

CAUTION

Should the lead wire be pinched by the handle cover

or come in contact with the armature or rotating

parts of the motor, a serious danger of electric shock

to the operator will be created. Exercise extreme

caution in disassembling and reassembling the

motor, follow the above procedure exactly.

DO NOT attempt to disassemble any parts other than

those necessary to effect replacement of the carbon

brushes.

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

Hitachi VTV-18A Seite 6

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