Makita HR2800 Manual De Instrucciones página 7

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
positions.
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.
• Bits such as hole saw, which tend to pintch or catch
easily in the hole, are not appropriate for this tool. This
is because they will cause the torque limiter to actuate
too frequently.
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Side grip (auxiliary handle) (Fig. 10)
CAUTION:
• Always use the side grip to ensure operating safety.
Install the side grip so that the teeth on the grip fit in
between the protrusions on the tool barrel. Then tighten
the grip by turning clockwise at the desired position. It
may be swung 360° so as to be secured at any position.
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.
Installing or removing the bit (Fig. 11)
Clean the bit shank and apply bit grease before installing
the bit. (Fig. 12)
Insert the bit into the tool. Turn the bit and push it in until it
engages.
After installing, always make sure that the bit is securely
held in place by trying to pull it out.
To remove the bit, pull the chuck cover down all the way
and pull the bit out. (Fig. 13)
Bit angle (when chipping, scaling or
demolishing)
For models HR2810, HR2810T, HR2811F, HR2811FT
(Fig. 14)
The bit can be secured at the desired angle. To change
the bit angle, rotate the action mode changing knob to the
O symbol. Turn the bit to the desired angle.
Rotate the action mode changing knob to the
Then make sure that the bit is securely held in place by
turning it slightly. (Fig. 15)
Depth gauge (Fig. 16)
The depth gauge is convenient for drilling holes of uniform
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.
Dust cup (Fig. 17)
Use the dust cup to prevent dust from falling over the tool
and on yourself when performing overhead drilling
operations. Attach the dust cup to the bit as shown in the
figure. The size of bits which the dust cup can be attached
to is as follows.
OPERATION
CAUTION:
• Always use the side grip (auxiliary handle) and firmly
hold the tool by both side grip and switch handle during
operations.
Hammer drilling operation (Fig. 18)
Set the action mode changing knob to the
Position the bit at the desired location for the hole, then
pull the switch 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 a tremendous and sudden twisting force
exerted on the tool/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 tool by both side
grip and switch handle during operations. Failure to do
so may result in the loss of control 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
precision.
Blow-out bulb (optional accessory)
(Fig. 19)
After drilling the hole, use the blow-out bulb to clean the
symbol.
dust out of the hole.
Dust cup 5
Dust cup 9
Bit diameter
6 mm - 14.5 mm
12 mm - 16 mm
symbol.
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