Operation - Makita DHR400 Instruction Manual

3. Tighten the side grip securely.
4. Set the suitable bellows or dust cover extension
for your work. When you use bellows, attach the joint to
its top. When you stack two bellows, connect them with
the joint.
► Fig.18: 1. Dust cover extension 2. Dust cover
3. Joint 4. Bellows
Connecting the tool to the vacuum
cleaner
1. Attach the holder joint to the tool, and then attach
the hose holder to the holder joint.
► Fig.19: 1. Holder joint 2. Hose holder
2. Fix the hose to the hose holder.
► Fig.20: 1. Hose holder
NOTE: Use joint 25 to connect the hose and the dust
cover if necessary.
Using depth gauge for drilling

operation

When you stack two bellows, attach the depth gauge
extension to the depth gauge.
► Fig.21: 1. Depth gauge extension
Dust extractor attachment (for
hammering only)
Optional accessory
1. Install the hose holder.
When the side handle is installed to tool, loosen the
clamp nut, and then remove the hex bolt. Install the
hose holder with the hex bolt and the clamp nut by
tightening the clamp nut firmly.
► Fig.22: 1. Bolt 2. Hose holder 3. Clamp nut
When the side grip is installed to the tool, loosen the
side grip, mount the hose holder to the shaft, and then
tighten the side grip firmly.
► Fig.23: 1. Hose holder 2. Shaft 3. Side grip
2. Attach the holder joint to the tool, and then attach
the hose holder to the holder joint.
► Fig.24: 1. Holder joint 2. Hose holder
3. Attach the dust cover and the hose to the tool, and
then fix the hose to the hose holders.
► Fig.25: 1. Dust cover 2. Hose 3. Hose holder
4.
Connect the hose to the hose of the vacuum
cleaner with the hose joint.
NOTE: If the hose is not included, attach the dust
cover to the cleaner's joint or attach it to Makita's
hose ø28.
5. Adjust the distance between the dust cover and
the tip of the chisel or bull point. The recommended
distance is 30 mm to 100 mm.
► Fig.26: (1) 30 mm to 100 mm
OPERATION
CAUTION:
Always use the side grip (auxiliary
handle) and firmly hold the tool by both side grip
and switch handle during operations.
CAUTION:
Always make sure that the work-
piece is secured before operation.
CAUTION:
Do not pull the tool out forcibly
even the bit gets stuck. Loss of control may
cause injury.
NOTE: If the battery cartridge is in low temperature,
the tool's capability may not be fully obtained. In this
case, warm up the battery cartridge by using the
tool with no load for a while to fully obtain the tool's
capability.
► Fig.27
Hammer drilling operation
CAUTION:
There is tremendous and sudden
twisting force exerted on the tool/drill 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 opera-
tions. Failure to do so may result in the loss of control
of the tool and potentially severe injury.
Set the action mode changing knob to the
Position the drill 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 drill bit partially from the hole.
By repeating this several times, the hole will be cleaned
out and normal drilling may be resumed.
NOTE: Eccentricity in the drill bit rotation may occur
while operating the tool with no load. The tool auto-
matically centers itself during operation. This does not
affect the drilling precision.
Chipping/Scaling/Demolition
Set the action mode changing knob to the
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.
► Fig.28
Blow-out bulb
Optional accessory
After drilling the hole, use the blow-out bulb to clean the
dust out of the hole.
► Fig.29
16 ENGLISH
symbol.
symbol.