Manual Makita HR2420 (page 6 of 52) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Spanish, Norwegian, Finnish)

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Depth gauge (Fig. 5)

The depth gauge is convenient for drilling holes of

uniform depth. Insert the depth gauge into the hole in

the grip base. Adjust the depth gauge to the desired

depth and then tighten the clamp screw to secure the

depth gauge.

NOTE:

The depth gauge cannot be used at the position

where the depth gauge strikes against the gear

housing.

Switch action (Fig. 6)

CAUTION:

Before plugging in the machine, always check to see

that the switch trigger actuates properly and returns to

the ‘‘OFF’’ position when released.

To start the machine, simply pull the trigger. Machine

speed is increased by increasing pressure on the

trigger. Release the trigger to stop.

Reversing switch action (Fig. 6)

CAUTION:

•

Always check the direction of rotation before opera-

tion.

•

Use the reversing switch only after the machine

comes to a complete stop. Changing the direction of

rotation before the machine stops may damage the

machine.

•

Do not pull the switch trigger when the reversing

switch lever is in the neutral position. If you pull the

trigger forcibly, the switch may be damaged.

This machine has a reversing switch to change the

direction of rotation. Move the lever to the

posi-

tion (A position) for clockwise rotation or the

posi-

tion (B position) for counterclockwise rotation.

Selecting action mode (Fig. 7)

This machine employs an action mode changing

knob. Select one of the two modes suitable for your

work needs by using this knob. For rotation only, turn

the knob so that the arrow on the knob points toward

the

symbol on the machine body. For rotation

with hammering, turn the knob so that the arrow on

the knob points toward the

symbol on the

machine body.

CAUTION:

Always set the knob fully to your desired mode

symbol. If you operate the machine with the knob

positioned half-way between the mode symbols, the

machine may be damaged.

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

machine immediately. This will help prevent prema-

ture wear of the machine.

•

Hole saws, core bits, diamond core bits, etc. cannot

be used with this machine. They tend to pinch or

catch easily in the hole. This will cause the torque

limiter to actuate too frequently.

Hammer drilling operation

Position the bit at the desired location for the hole,

then pull the trigger.

Do not force the machine. Light pressure gives best

results. Keep the machine 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

machine 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 a tremendous and sudden twisting force

exerted on the machine/bit at the time of hole break-

through, 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 machine by both

side grip and switch handle during operations. Failure

to do so may result in the loss of control of the

machine and potentially severe injury.

Bit grease

Coat the bit shank head beforehand with a small

amount of bit grease (about 0.5–1g).

This chuck lubrication assures smooth action and

longer service life.

Blow-out bulb (Fig. 8)

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

Dust cup (Fig. 9)

Use the dust cup to prevent dust from falling over the

machine and on yourself when performing overhead

drilling operations. Attach the dust cup to the bit as

shown in Fig. 9. The dust cup can be attached to the

bit up to 14.5 mm in diameter.

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Makita HR2420 Manual

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