Bedienungsanleitung Makita hr 2450 ft (Seite 7 von 19) (Englisch, Holländisch)

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CAUTION:

• Do not rotate the action mode changing knob when the

tool is running under load. The tool will be damaged.

• To avoid rapid wear on the mode change mechanism,

be sure that the action mode changing knob is always

positively located in one of the three action mode posi-

tions.

Torque limiter

The torque limiter will actuate when a certain torque level

is reached. The motor will disengage from the output

shaft. When this happens, the bit will stop turning.

CAUTION:

• As soon as the torque limiter actuates, switch off the

tool immediately. This will help prevent premature wear

of the tool.

• Hole saws cannot be used with this tool. They tend to

pinch or catch easily in the hole. This will cause the

torque limiter to actuate too frequently.

Hammer drilling operation

(Fig. 15)

Set the action mode changing knob to the H symbol.

Position the bit at the desired location for the hole, then

pull the trigger.

Do not force the tool. Light pressure gives best results.

Keep the tool in position and prevent it from slipping away

from the hole.

Do not apply more pressure when the hole becomes

clogged with chips or particles. Instead, run the tool at an

idle, then remove the bit partially from the hole. By

repeating this several times, the hole will be cleaned out

and normal drilling may be resumed.

CAUTION:

There is tremendous and sudden twisting force exerted

on the tool/bit at the time of hole breakthrough, when the

hole becomes clogged with chips and particles, or when

striking reinforcing rods embedded in the concrete.

Always use the side grip (auxiliary handle) and firmly

hold the tool by both side grip and switch handle during

operations. Failure to do so may result in the loss of con-

trol of the tool and potentially severe injury.

NOTE:

Eccentricity in the bit rotation may occur while operating

the tool with no load. The tool automatically centers itself

during operation. This does not affect the drilling preci-

sion.

Bit grease

Coat the bit shank head beforehand with a small amount

of bit grease (about 0.5 – 1 g).

This chuck lubrication assures smooth action and longer

service life.

Blow-out bulb (Fig. 16)

Use the blow-out bulb to clean out the hold.

Dust cup (Fig. 17)

Use the dust cup to prevent dust from falling over the tool

and on yourself when performing overhead drilling opera-

tions. Attach the dust cup to the bit as shown in Fig. 17.

The size of bits which the dust cup can be attached to is

as follows.

Chipping/Scaling/Demolition (Fig. 18)

Set the action mode changing knob to the g symbol.

Hold the tool firmly with both hands. Turn the tool on and

apply slight pressure on the tool so that the tool will not

bounce around, uncontrolled. Pressing very hard on the

tool will not increase the efficiency.

Drilling in wood or metal

For model HR2450/HR2450F/HR2450X (Fig. 19)

Use the optional drill chuck assembly. When installing it,

refer to “Installing or removing drill bit” described on the

previous page.

For model HR2450T/HR2450FT (Fig. 11)

Use the drill chuck assembly as standard equipment.

When installing it, refer to “Changing the tool holder”

described on the previous page.

Hold the ring and turn the sleeve counterclockwise to

open the chuck jaws. Place the bit in the chuck as far as

it will go. Hold the ring firmly and turn the sleeve clock-

wise to tighten the chuck.

To remove the bit, hold the ring and turn the sleeve coun-

terclockwise. (Fig. 20)

Set the action mode changing knob to the m symbol. You

can drill up to 13 mm diameter in metal and up to 32 mm

diameter in wood.

CAUTION:

• Never use “rotation with hammering” when the drill

chuck assembly is installed on the tool. The drill chuck

assembly may be damaged.

Also, the drill chuck will come off when reversing the

tool.

• Pressing excessively on the tool will not speed up the

drilling. In fact, this excessive pressure will only serve

to damage the tip of your bit, decrease the tool perfor-

mance and shorten the service life of the tool.

• There is a tremendous twisting force exerted on the

tool/bit at the time of hole breakthrough. Hold the tool

firmly and exert care when the bit begins to break

through the workpiece.

• A stuck bit can be removed simply by setting the

reversing switch to reverse rotation in order to back out.

However, the tool may back out abruptly if you do not

hold it firmly.

• Always secure small workpieces in a vise or similar

hold-down device.

Diamond core drilling

When performing diamond core drilling operations,

always set the change lever to the

position to use “rota-

tion only” action.

CAUTION:

If performing diamond core drilling operations using

“rotation with hammering” action, the diamond core bit

may be damaged.

MAINTENANCE

CAUTION:

Always be sure that the tool is switched off and

unplugged before carrying out any work on the tool.

To maintain product safety and reliability, repairs, mainte-

nance or adjustment should be carried out by a Makita

Authorized Service Center.

Bit diameter (mm)

Dust cup 5 6 – 14.5

Dust cup 9 12 – 16

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