Manual Hitachi dv 20 vb (page 23 of 26) (English, Danish, Swedish, Norwegian, Finnish)

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side) by pushing the R-side of the reversing switch

lever.

The L-side of the lever is pushed to turn the bit

counterclockwise. (For DV20VB only)

CAUTION

Always use the impact drill with clockwise rotation,

when using it as an impact drill.

7. Fixing the side handle (Fig. 6)

Loosen the wing 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 wing bolt. To remove the side

handle, loosen the wing bolt and rotate the handle.

To attach a depth gauge on the side handle, insert

the gauge into the U-shaped groove on the side

handle, adjust the position of the depth gauge in

accordance with the desired depth of the hole, and

firmly tighten the wing bolt.

8. IMPACT to ROTATION changeover (Fig. 7)

The Impact Drill can be switched from IMPACT

(impact plus rotation) to ROTATION (rotation only)

by turning the change lever. When boring concrete,

stone, tile or similar hard materials, turning the

change lever to IMPACT side. The drill head impacts

against the material while continuing to rotate.

When boring metal, wood or plastic, turning the

change lever to ROTATION side. The drill rotates

as an ordinary electric drill.

CAUTION

⅜ Do not use the Impact Drill in the IMPACT

function if the material can be bored by rotation

only. Such action will not only reduce drilling

efficiency, but may also damage the drill tip.

⅜ The change lever may not turn smoothly when

changing from impact drill mode to drill mode

(Fig. 7).

In this case, switch ON and operate the machine

for few seconds.

The spindle shaft will then be pushed forward,

and the change lever can be moved smoothly.

9. High-speed/Low-speed changeover

To change speed, rotate the gear shift dial as

indicated by the arrow in Fig. 8. The numeral “1”

engraved on the drill body denotes low speed, the

numeral “2” denotes high speed.

PRACTICAL HANDLING PROCEDURES

1. Speed adjustment and switch operation

⅜ The drill speed can be adjusted from 0 through full

speed by regulating the trigger-squeezing force.

The more the trigger is squeezed, the faster the drill

rotates. When the trigger is squeezed fully, the

speed is the maximum. (for DV20VB and DV20VC)

⅜ Pulling the trigger switch and pushing the stopper,

it keeps the switched-on condition which is

convenient for continuous running. When switching

off, the stopper can be disconnected by pulling the

trigger again.

2. When using as a Drill or an Impact Drill

(1) Pressing force of the drill

You cannot drill holes more quickly even if you

press the drill with a stronger force than necessary.

It not only damages tip of drill bit and decreases

the efficiency of operation, but also shortens the

life of the drill tip.

(2) In case of penetrating holes

Drill bits can be broken when the material being

drilled is penetrated. It is important to decrease

pressing force just before penetrating.

CAUTION

In continuous operation, conduct no-load operation

for five seconds after completing a drilling job.

(3) When a thick drill bit is used

Your arm is subjected to larger reaction force when

a thicker drill bit is used. Be careful not to be moved

by the reaction force. For this, establish a foothold,

hold the unit tightly with both hands perpendicularly

to the material being drilled.

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 ferquently and replace it 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. Fail-

ure to do so could result in serious hazard.

3. 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.

4. Inspecting the carbon brushes (Fig. 10)

The motor employs carbon brushes which are

consumable parts. Since an excessively worn car-

bon brush can result in motor trouble, replace the

carbon brushes with new ones 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.

5. Replacing carbon brushes (Fig. 11)

⅜ Disassembling

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

remove the handle cover.

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

burshes, 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 holdres,

and connect the brush terminals to the carbon

brushes.

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

original positions, an illustrated in Fig. 11.

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

Be very careful not to allow the lead wires to

contact the armature or rotating parts of the motor.

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

ensure it does not pinch the lead wires, and secure

it firmly with the three screws.

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Hitachi dv 20 vb Manual

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