Manual Hitachi DH20DV (page 11 of 74) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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English

When you feel that the power of the tool becomes

weaker, stop using the tool and recharge its battery.

If you continue to use the tool and exhaust the

electric current, the battery may be damaged and

its life will become shorter.

(2) Avoid recharging at high temperatures.

A rechargeable battery will be hot immediately after

use. If such a battery is recharged immediately after

use, its internal chemical substance will deteriorate,

and the battery life will be shortened. Leave the

battery and recharge it after it has cooled for a

while.

CAUTIONS

⅜ If the battery has been heated (due to sunlight, etc.)

right after operation, the charger’s pilot lamp may

not light in red. In such a case, first let the battery

cool, then start charging.

⅜ When the pilot lamp flikers in red (at 0.2–second

intervals), check for and take out any foreign objects

in the charger’s battery installation hole. If there are

no foreign objects, it is probable that the battery

or charger is malfunctioning. Take it to your

authorized Service Center.

⅜ Since the built-in micro computer takes about 3

seconds to confirm that the battery being charged

with UC24YF/UC24YFA is taken out, wait for a

minimum of 3 seconds before reinserting it to

continue charging. If the battery is reinserted within

3 seconds, the battery may not be properly charged.

PRIOR TO OPERATION

1. Mounting the drill bit (Fig. 6)

(1) To attach a drill bit (SDS-plus shank), fully pull the

grip in the direction of the arrow as shown in Fig.

6 and insert the drill bit as far as it will go while

rotating.

(2) By releasing the grip, the drill bit will be secured.

(3) To remove the drill bit, fully pull the grip in the

direction of the arrow and pull out the drill bit.

2. Confirm that the battery is mounted correctly.

3. Installation of dust cup or dust collector (B) (Optional

accessories) (Fig. 8, Fig. 9)

When using a rotary hammer for upward drilling

operations attach a dust cup or a dust collector (B)

to collect dust or particles for easy operation.

⅜ Installing the dust cup

Use the dust cup by attaching to the drill bit as

shown in Fig. 8.

When using a bit which has big diameter, enlarge

the center hole of the dust cup with this rotary

hammer.

⅜ Installing dust collector (B)

When using dust collector (B), insert dust collector

(B) from the tip of the bit by aligning it to the

groove on the grip. (Fig. 9)

CAUTION:

⅜ The dust cup and dust collector (B) are for exclusive

use of concrete drilling work. Do not use them for

wood or metal drilling work.

⅜ Insert dust collector (B) completely into the chuck

part of the main unit.

⅜ When turning the rotary hammer on while dust

collector (B) is detached from a concrete surface,

dust collector (B) will rotate together with the drill

bit. Make sure to turn on the switch after pressing

dust cup on the concrete surface. When using dust

collector (B) attached to a drill bit that has more

than 190 mm of overall length, dust collector (B)

cannot touch the concrete surface and will rotate.

Therefore, please use dust collector (B) by attaching

to drill bits which have 166 mm, 160 mm, and 110

mm overall length.

⅜ Dump particles after every two or three holes when

drilling.

⅜ Please replace the drill bit after removing dust

collector (B).

4. Selecting the driver bit

Screw heads or bits will be damaged unless a bit

appropriate for the screw diameter is employed to

drive in the screws.

5. Confirm the direction of bit rotation (Fig. 11)

The bit rotates clockwise (viewed from the rear

side) by pushing the R-side of the push button. (Fig.

11-a)

The L-side of the push button is pushed to turn the

bit counterclockwise. (Fig. 11-b)

The motor does not rotate if the push button is set

to the center position. (Fig. 11-c)

6. Continuous drilling

The number of holes that can be drilled in concrete

after one recharge is shown in Table 4.

Table 4

These data are for the referential values. The number of

holes that can be drilled varies according to the sharpness

of the used bit or the conditions of the concrete being

drilled.

CAUTION

When using this unit continuously, the unit may

overheat, leading to damage in the motor and switch.

Please leave it without using it for approximately

15 minutes.

HOW TO USE

1. Switch operation

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.

2. Rotation + Striking

Align the “

” mark with the “ ” mark by rotating

the change lever to set the “Rotation + Striking”

mode. (Fig. 10)

(1) Mount the drill bit.

(2) Pull the trigger switch after applying the drill bit

tip to the drilling position. (Fig. 7)

Bit dia. (mm) Depth (mm)

Possible continuous

drilling number (holes)

6.5 30 75

8.5 30 64

12.5 35 42

14.5 45 29

18 40 26

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Hitachi DH20DV Manual

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