Makita HR2450 Betriebsanleitung Seite 6

Bit angle (when chipping, scaling or demolishing)
CAUTION:
Always be sure that the tool is switched off and
unplugged before changing the bit angle.
The bit can be secured at the desired angle. To change
the bit angle, depress the lock button and rotate the
action mode changing knob to the O symbol. Turn the
bit to the desired angle. (Fig. 5)
Depress the lock button and rotate the action mode
changing knob to the g symbol. Then make sure that
the bit is securely held in place by turning it slightly.
(Fig. 6)
Depth gauge (Fig. 7)
The depth gauge is convenient for drilling holes of uni-
form depth. Loosen the side grip and insert the depth
gauge into the hole in the side grip. Adjust the depth
gauge to the desired depth and tighten the side grip.
NOTE:
The depth gauge cannot be used at the position where
the depth gauge strikes against the gear housing.
Switch action (Fig. 8)
CAUTION:
Before plugging in the tool, always check to see that the
switch trigger actuates properly and returns to the "OFF"
position when released.
To start the tool, simply pull the switch trigger. Tool speed
is increased by increasing pressure on the switch trigger.
Release the switch trigger to stop. For continuous opera-
tion, pull the switch trigger and then push in the lock but-
ton. To stop the tool from the locked position, pull the
switch trigger fully, then release it.
Lighting up the lamps
For model HR2450F
CAUTION:
Do not look in the light or see the source of light directly.
To turn on the lamp, pull the trigger. Release the trigger
to turn it off.
NOTE:
Use a dry cloth to wipe the dirt off the lens of lamp. Be
careful not to scratch the lens of lamp, or it may lower the
illumination.
Reversing switch action (Fig. 9)
This tool has a reversing switch to change the direction of
rotation. Move the reversing switch lever to the
tion (
A side) for clockwise rotation or the
(
B side) for counterclockwise rotation.
CAUTION:
• Always check the direction of rotation before operation.
• Use the reversing switch only after the tool comes to a
complete stop. Changing the direction of rotation
before the tool stops may damage the tool.
• When you operate the tool in counterclockwise rotation,
the switch trigger is pulled only halfway and the tool
runs at half speed. For counterclockwise rotation, you
cannot push in the lock button.
6
(Fig. 8)
D posi-
E position
Selecting action mode
Rotation with hammering (Fig. 10)
For drilling in concrete, masonry, etc., depress the lock
button and rotate the action mode changing knob to the
H symbol. Use a tungsten-carbide tipped bit.
Hammering only (Fig. 11)
For chipping, scaling or demolition operations, depress
the lock button and rotate the action mode changing
knob to the g symbol. Use a bull point, cold chisel, scal-
ing chisel, etc.
Rotation only (Fig. 12)
For drilling in wood, metal or plastic materials, depress
the lock button and rotate the action mode changing
knob to the m symbol. Use a twist drill bit or wood bit.
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
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.
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. 14)
Use the blow-out bulb to clean out the hold.
(Fig. 13)