Makita HR5000 Instruction Manual page 6

Installing or removing drill bit or other bits
(bull point, etc.) (Fig. 3)
Important:
Always be sure that the tool is switched off and
unplugged before installing or removing the bit.
Insert the bit into the tool holder as far as it will go. Pull
out and turn the tool retainer 180 degrees. Then
release it to secure the bit.
CAUTION:
Never use A-type shank bits. They can cause damage
to the tool.
To remove the bit, follow the installation procedure in
reverse.
Selecting action mode (Fig. 4)
Rotation with hammering:
For drilling in concrete, masonry, etc., rotate the
change lever to the
Hammering only:
For chipping, scaling or demolition operations, rotate
the change lever to the
CAUTION:
• Do not rotate the change lever when the tool is
running under load. The tool will be damaged.
• To avoid rapid wear on the mode change mecha-
nism, be sure that the change lever is always
positively located in one of the two action mode
positions.
Switch action (Fig. 5)
CAUTION:
• Before plugging in the tool, always check to
see that the switch trigger actuates properly and
returns to the "OFF" position when released.
• Do not tape, tie or otherwise secure the trigger in
the "ON" position.
To start the tool, simply pull the trigger. Release
the trigger to stop.
Hammer drilling operation
Position the bit at the 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 from the hole. By
repeating this several times, the hole will be cleaned
out.
6
position.
position.
CAUTION:
When the bit begins to break through concrete or if
the bit strikes reinforcing rods embedded in concrete,
the tool may react dangerously. Maintain good
balance and safe footing while holding the tool
firmly with both hands to prevent dangerous reaction.
Chipping / Scaling / Demolition
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, uncon-
trolled. Pressing very hard on the tool will not
increase the efficiency.
Core bit (optional accessory)
When using the center bit
Screw the core bit on the adapter. Install the adapter
with the core bit in the tool in the same manner
as a drill bit. (Fig. 6)
Install the center bit. (Fig. 7)
Rest the core bit on the concrete and turn the
tool on. Once the core bit has cut a shallow
groove into the concrete, remove the center bit. Then
resume drilling.
To remove the core bit, follow the procedures (1)
or (2).
(1) Rotate the change lever to the
rest the core bit on the concrete and turn the
tool on. The core bit will come loose from the
hammering action. (Fig. 8)
(2) Hold the adapter with the wrench, insert the rod
(optional accessory) into the hole in the core bit
and tap with a hammer to unscrew. (Fig. 9)
When not using the center bit
Screw the core bit on the adapter. Install the adapter
with the core bit in the tool in the same manner
as a drill bit. (Fig. 6)
Rotate the change lever to the
core bit on the concrete and turn the tool on.
Once the core bit has cut a shallow groove into the
concrete, rotate the change lever to the
and resume drilling.
NOTE:
No problem is caused even if the core bit unscrews
slightly during brief use since the core bit rotates in
the tightening direction.
To remove the core bit, follow the same removal
procedures covered in When using the center bit.
position. Then
position. Rest the
position