Manual Hitachi DH40FR (page 8 of 54) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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English

PRIOR TO OPERATION

1. Power source

Ensure that the power source to be utilized conforms

to the power requirements specified on the product

nameplate.

2. Power switch

Ensure that the power switch is in the OFF position. If

the plug is connected to a power receptacle while the

power switch is in the ON position, the power tool

will start operating immediately, which could cause a

serious accident.

3. Extension cord

When the work area is removed from the power

source, use an extension cord of sufficient thickness

and rated capacity. The extension cord should be kept

as short as practicable.

4. How to install dust cover (Fig. 1)

Always install the dust cover on the drill bit or the

taper shank adapter.

Insert the dust cover until it lies flush in the groove.

NOTE

For a thick drill bit, insert the dust cover from drill

rear.

5. How to install tool

NOTE

For tools such as a bull point and a cold chisel, use

only Hitachi genuine parts.

(1) Clean, then smear the tool shank with the grease

provided in the green tube (Fig. 2).

(2) Pull the tool holder in the direction of arrow A and

rotate it in the direction of arrow B (counterclockwise).

Fully insert the tool shank into the hexagonale hole

of the front cover. (Fig. 3)

(3) Return the tool holder to fix the tool.

(4) Pull the tool to make sure it is locked completely.

NOTE

Remove in the reverse order to installation.

6. Regulating the number of rotations and hammering

(Fig. 4)

This Rotary Hammer is equipped with a built-in

electronic control circuit that can adjust and regulate

the number of rotations and times of hammering. This

Rotary Hammer can be used by adjusting the dial,

depending upon the contents of operation, such as

boring holes into fragile materials, chipping,

centering, etc.

The scale ‘1’ of the dial is designed for a minimum

speed with the number of 240 rotations per minute

and 1320 times of blow per minute. The scale ‘6’ is

designed for a maximum speed with the number of

480 rotations per minute and 2650 times of blow per

minute.

CAUTION

Do not adjust the dial during operation. Doing so can

result in injury because the Rotary Hammer must be

held by only one hand, disabling the steady control

of the Rotary Hammer.

HOW TO USE THE ROTARY HAMMER

1. How to drill holes (Fig. 5)

(1) Pull the switch trigger after applying the drill bit tip to

the drilling position.

(2) It is unnecessary to forcibly press the rotary hammer

main body. It is sufficient to slightly press the rotary

hammer to an extent that shavings are freely

discharged.

CAUTION

Although this machine is equipped with a safety

clutch, if the drill bit becomes bound in concrete or

other material, the resultant stoppage of the drill bit

could cause the machine body to turn in reaction.

Ensure that the main handle and side handle are

gripped firmly during operation.

2. How to chisel or crush (Fig. 6)

By applying the drill bit tip to the chiseling or crushing

position, operate the rotary hammer by utilizing its

empty weight.

Forcible pressing or thrusting is unnecessary.

3. When drilling at “rotation + hammering”:

CAUTION

If you switch the selector lever during motor rotation,

the tool can start to rotate abruptly, resulting in

unexpected accidents. Be sure to switch the selector

lever when the motor is at a complete stop.

(1) Switching to “rotation + hammering”

(a) Push the button, release lock and turn the selector

lever clockwise.

(b) Align

of the selector lever and of the lever

holder as illustrated in Fig. 7.

NOTE

Turn the selector lever (do not push the button) to

check if it is completely locked and make sure that it

does not turn.

4. When chipping and chiseling at “hammering”:

CAUTION

⅜ If the selector lever is switched during motor rotation,

the tool can start to rotate abruptly, resulting in

unexpected accidents. Make sure to switch the

selector lever when the motor is at a complete stop.

⅜ If the bull point or cold chisel is used at the position

of ”rotation + hammering”, the tool can start to rotate,

resulting in unexpected accidents. Make sure that they

are used at the position of ”hammering”.

(1) Switching to ”hammering”

(a) Push the button, release lock and turn the selector

lever counterclockwise.

(b) Align

of the selector lever and of the lever

holder as illustrated in Fig. 8.

NOTE

Turn the selector lever (do not push the button) to

check if it is completely locked and make sure that it

does not turn.

5. Install the stopper (Fig. 9)

(1) Loosen the side handle and insert the straight portion

of the stopper into the handle bolt hole.

(2) Move the stopper to the specified position and rotate

the grip of the side handle clockwise to fix the stopper.

6. Warming up (Fig. 10)

The grease lubrication system in this unit may require

warming up in cold regions.

Position the end of the bit so makes contact with the

concrete, turn on the switch and perform the warming

up operation. Make sure that a hitting sound is

produced and then use the unit.

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Hitachi DH40FR Manual

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