Operation - Makita GRH08 Instruction Manual

Storage
NOTICE:
When not in use for a certain period
of time, the nozzle guide needs to be extended
to approximately 100 mm (3-15/16") from its fully
shortened position. Failing to do so may damage
the duct hose pre-installed in the nozzle guide.
2
Fig.47
► 1. Guide adjustment button 2. Approx. 100 mm
(3-15/16")

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.
NOTICE:
Before using the dust collection sys-
tem with the tool, read the section about the dust
collection system.
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.48
Hammer drilling operation
CAUTION:
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-
1
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.49
Drilling in wood or metal
CAUTION:
when the drill bit begins to break through the
workpiece. There is a tremendous force exerted on
the tool/drill bit at the time of hole break through.
CAUTION:
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.
CAUTION:
vise or similar hold-down device.
19 ENGLISH
There is tremendous and sudden
Hold the tool firmly and exert care
A stuck drill bit can be removed
Always secure workpieces in a
symbol.
symbol.