5
For conventional type of abrasive paper without pre-
punched holes (optional accessory):
Turn the clamp lever counterclockwise. Insert the paper
end into the clamper, aligning the paper edges even and
parallel with the sides of the base. Then return the clamp
lever to the original position to secure the paper. Repeat
the same process for the other end of the tool, maintain-
ing the proper paper tension. Place the punch plate
(optional accessory) over the paper so that the guide of
the punch plate is flush with the sides of the pad. Then
press the punch plate to make holes in the paper.
(Fig. 2)
For hook-and-loop type of abrasive paper with pre-
punched holes (optional accessory):
Remove all dirt or foreign matter from the pad. Attach the
paper to the pad, aligning the holes in the paper with
those in the pad.
(Fig. 3)
CAUTION:
Never use pressure-sensitive abrasive paper.
For BO4901 only
NOTE:
To use the hook-and-loop type of abrasive paper, first
replace the pad. Remove the pad for the conventional
type of abrasive paper from the tool with a screwdriver.
(Fig. 4)
Install the pad for the hook-and-loop type of abrasive
paper (optional accessory) on the tool. Tighten the
screws firmly to secure the pad.
Installing paper dust bag
For BO4900, BO4900V only
Place the paper dust bag on the paper dust bag holder
with its front side upward. Insert the front fixing card-
board of the paper dust bag into the groove of the paper
dust bag holder.
(Fig. 5)
Then press the upper part of the front fixing cardboard in
arrow direction to hook it onto the claws.
(Fig. 6)
Insert the notch of the paper dust bag into the guide of
the paper dust bag holder. Then install the paper dust
bag holder set on the tool.
(Fig. 7 & 8)
Connecting to vacuum cleaner (Fig. 9)
When you wish to perform cleaner operation, connect a
vacuum cleaner to your tool. Connect a hose of vacuum
cleaner to the dust nozzle.
Switch action (Fig. 10)
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. Release
the trigger to stop. For continuous operation, pull the
switch trigger and then push in the lock button. To stop
the tool from the locked position, pull the switch trigger
fully, then release it.
Speed adjusting dial (Fig. 10)
For BO4900V only
The tool speed can be infinitely adjusted between 4,000
and 10,000 orbits per minute by turning the speed adjust-
ing dial, which is marked 1 to 5. Higher speed is obtained
when the dial is turned in the direction of number 5; lower
speed is obtained when it is turned in the direction of
number 1. Adjust the desired tool speed for the kind of
work.
CAUTION:
• If the tool is operated continuously at low speeds, the
motor will get overloaded and heated up.
• The speed adjusting dial can be turned only as far as 5
and back to 1. Do not force it past 5 or 1, or the speed
adjusting function may no longer work.
Operation (Fig. 11)
Turn the tool on and wait until it attains full speed. Then
gently place the tool on the workpiece surface. Keep the
base flush with the workpiece and apply a light pressure
on the tool.
CAUTION:
• Never run the tool without the abrasive paper. You may
seriously damage the pad.
• Never force the tool. Excessive pressure may decrease
the sanding efficiency, damage the abrasive paper and/
or shorten tool life.
• The front grip is a screwed type one. Always be sure
that the front grip is tightened securely before opera-
tion.
MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
To maintain product safety and reliability, repairs, mainte-
nance or adjustment should be carried out by a Makita
Authorized Service Center.
