Maintenance - Makita 9902 Instruction Manual

Switch action (Fig. 6)
CAUTION:
• Before plugging in the tool, always check to see that
the switch trigger actuates properly and returns to the
"OFF" position when released.
• The tool should not be in contact with the workpiece
surface when you turn the tool on or off. Otherwise a
poor sanding finish or damage of the belt may result.
To start the tool, simply pull the trigger. Release the trig-
ger to stop. For continuous operation, pull the trigger and
then push in the lock button. To stop the tool from the
locked position, pull the trigger fully, then release it.
Speed adjusting dial (Fig. 7)
For 9903, 9920 and 9404
The belt speed can be infinitely adjusted between 210 m
and 440 m per minute by turning the speed adjusting dial
to a given number setting from 1 to 5. Higher speed is
obtained when the dial is turned in the direction of num-
ber 5; lower speed is obtained when it is turned in the
direction of number 1. Select the proper speed for the
workpiece to be sanded.
CAUTION:
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.
Sanding operation (Fig. 8)
Hold the tool firmly with both hands. Turn the tool on and
wait until it attains full speed. Then gently place the tool
on the workpiece surface. Keep the belt flush with the
workpiece at all times and move the tool back and forth.
Never force the tool. The weight of the tool applies ade-
quate pressure. Excessive pressure may cause stalling,
overheating of the motor, burning of the workpiece and
possible kickback.
Connecting to Makita vacuum cleaner or dust collec-
tor
Cleaner sanding operations can be performed by con-
necting the belt sander to Makita vacuum cleaner or dust
collector.
When connecting to Makita vacuum cleaner (Model 406/
431), an optional hose 28 mm in inner diameter is neces-
sary. See Fig. 9.
When connecting to Makita dust collector (Model 420/
420S), the optional hose is not necessary. You can con-
nect the belt sander directly to the hose of the dust col-
lector.
Belt sander stand (optional accessory) (Fig. 10)
The belt sander stand is handy for sanding small work-
pieces or deburring workpieces.
Sanding shoe (optional accessory) (Fig. 11)
The sanding shoe readily allows you to sand workpieces
more evenly.

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Replacement of carbon brushes (Fig. 12 & 13)
Replace carbon brushes when they are worn down to the
limit mark. Both identical carbon brushes should be
replaced at the same time.
To maintain product safety and reliability, repairs, mainte-
nance or adjustment should be carried out by a Makita
Authorized Service Center.
ACCESSORIES
CAUTION:
These accessories or attachments are recommended for
use with your Makita tool specified in this manual. The
use of any other accessories or attachments might
present a risk of injury to persons. Only use accessory or
attachment for its stated purpose.
If you need any assistance for more details regarding
these accessories, ask your local Makita service center.
• Abrasive belt
Type AA: For wood, iron and steel
Type CC: For stone and plastics
AA AA AA
Grit
40 60 80
Use Coarse
CC CC CC
Grit
40 60 80
Use Coarse
• Dust bag
• Hose 28 mm in inner diameter
• Belt sander stand
• Sanding shoe
AA AA AA AA
100 120 150 180
Medium Fine
CC CC CC CC
100 120 150 180
Medium Fine
AA
240
CC
240
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