Makita 9921 User manual

Belt Sander
Model
100 mm (4") MODEL 9403
76 mm (3") MODEL 9921
Overall Net
length weight
Belt size Belt speed
INSTRUCTION MANUAL
Y4UJ
DOUBLE
INS U L AT ION
353 mm (13 Ibsl
(3" x 24")
SPEC I Fl CAT1 0 NS
I 76 mm x 610"
nniq
(1,640 ft.) "In' (13-29132")
500m I
---- I 100 mm x 610 mm I I I 5.9 ko
I (3" x 24") I I I (12.1 lbsl
JJL I
* Manufacturer reserves the right to change specifications without notice.
* Note: Specifications may differ from country to country.
WARNING: For your personal safety, READ and UNDERSTAND before using.
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE.

GENERAL SAFETY RULES
(For All Tools)
WARNING! Read and understand all instructions. Failure
tofollow
all instructions listedbelow, may result in electric
shock, fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
. READ ALL INSTRUCTIONS.
1. Keep your work area clean andwell lit. Cluttered benches and dark areasinvite
accidents.
2. Donot operate powertools in explosiveatmospheres, suchas inthe presence
of flammable liquids, gases, or dust. Power tools create sparks which may
ignite the dust or fumes.
3. Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to loose control.
4. Double Insulatedtools are equipped witha polarizedplug(oneblade iswider
than the other.) This plug will fit
in a polarized outlet only one way. If the
plug does not
fit fully in the outlet, reverse the plug. If it still does not fit,
contact a qualified electrician to install a polarized outlet. Do not change
the plug in any way. Double insulation
I3 eliminates the need for the three
wire grounded power cord and grounded power supply system.
5. Avoid body contact with grounded surfaces such as pipes, radiators, ranges
and refrigerators. There is an increased risk of electric shock if your body is
grounded.
6. Don't expose power tools to rain or wet conditions. Water entering a power
tool
will increase the risk of electric shock.
7. Do not abuse the cord. Never use the cordto carry the tools or pullthe plug
from an outlet. Keep cord away from heat, oil, sharp edges or movingparts.
Replace damaged cords immediately. Damaged cords increase the risk of
electric shock.
8. Whenoperating a power tooloutside, use an outdoor extension cordmarked
"W-A' or "W." These cords are rated for outdoor use and reduce the risk
of electric shock.
9. Stay alert, watch what you aredoing and usecommonsense whenoperating
a power tool.
Do not use tool while tired or under the influence of drugs,
alcohol, or medication.
A momentof inattentionwhile operating power tools
may result in serious personal injury.
IO. Dressproperly. Do notwear looseclothing orjewelry. Contain longhair. Keep
your hair, clothing, andglovesawayfrom movingparts. Looseclothes, jewelry
or long hair can be caught in moving parts.
2

11. Avoid accidental starting. Be sure switch is off before plugging in. Carrying
tools
with your finger onthe switchor plugging in tools that havetheswitch
on invites accidents.
12. Remove adjusting keys or switches before turning the tool on. A wrench or
a key that is left attachedtoa rotating part
of thetool may result in personal
injury.
13. Donotoverreach. Keepproperfootingand balanceat alltimes. Proper footing
and balance enables better control of the tool
in unexpected situations.
14. Use safety equipment. Always wear eye protection. Dust mask, non-skid
safety shoes, hard hat, or hearing protection must be used for appropriate
conditions.
15. Use clamps or other practical way to secure and support the workpiece to
a stable platform. Holdingthe work by handor againstyour body is unstable
and may lead to
loss of control.
16. Donot force tool. Usethe correct toolfor your application. The correct tool
will do the job better and safer at the rate for which
it is designed.
17. Do not use tool if switch does not turn it on or off. Any tool that cannot
be controlled
with the switch is dangerous and must be repaired.
18. Disconnect the plugfrom the power source before makingany adjustments,
changing accessories, or storing the tool. Such preventive safety measures
reduce the risk of starting the tool accidentally.
19. Store idle tools out of reach of children and other untrained persons. Tools
are dangerous
in the hands of untrained users.
20. Maintain tools with care. Keep cutting tools sharp and clean. Properly
maintainedtools,
with sharp cutting edges are less likely tobindand are easier
to control.
21. Check for misalignment or binding of movingparts, breakage of parts, and
any other condition that may affect the tools operation. If damaged, have
the tool serviced before using. Many accidents are caused by poorly main-
tained tools.
22. Use only accessories that are recommended by the manufacturer for your
model. Accessories that may besuitable for one tool, maybecome hazardous
when used on another tool.
23. Tool service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel could result
in a risk of
injury.
24. When servicinga tool, use only identicalreplacement parts. Follow instruc-
tions
in the Maintenance section of this manual. Use of unauthorized parts
or failure
to follow Maintenance Instructionsmaycreate a risk of electric shock
or injury.
3

Specific Safety Rules
1. Holdtools by insulated gripping surfaceswhen performing an operation where
the cutting tool may contact hidden wiring or its own cord. Contact
with a
"live" wire
will make exposed metal parts of the tool "live" and shock the
operator.
2. Hold the tool firmly with both hands.
3. Make sure the belt is not contacting the workpiece before the switch is
4. Keep hands away from rotating parts.
5. Do not leave the tool running. Operate the tool only when hand-held.
6. This tool has not been waterproofed, so do not use water on the workpiece
turned on.
surface.
SAVE THESE INSTRUCTIONS.
4

SYMBOLS
The followings show the symbols usedfor tool.
?J
Dl
A
AA
.../ min
G=l
............... volts
................................. amperes
................................. kilograms
............... herts
........................ hours
............................
................................. seconds
........................... alternating current
................. direct current
................................. no load speed
................................. alternating or direct current
................................. Class II Construction
................................. splash-proof construction
................................. watertight construction
................................ revolutions or reciprocation per minute
................................. number of blow
5

removing abrasive belt
sure that the tool is switched off and unplugged before installing or removing
the belt.
all the way out and install the
rollers,then return the lever to
the orig
ial position
itself.
Adjustir
While th
knob to
I
6
belt tracking
selt is running, use the adjustirlg
iter the belt tracking.
1
Lever
I
Adjusting
knob

the q
firm11
comi
t bag, push it onto the dust spout
s far as it will go to prevent it from
off during operation.
best results, empty the dust bag
becomes about half full, tapping it
3 remove as much dust as possible.
Dust bag
\:'is """
action
IN
plugging in the tool, always check to see that the switch trigger actuates properly
turns to the "OFF" position when released
01 should not be in contact with the workpiece surface when you turn the tool on
Otherwise a poor sandingfinish or damage of the belt may result
t the tool, simply pull the trigger.
! the trigger to stop. For continuous
in, pull the trigger and then push in
: button. To stop the tool from the
>osition, pull the trigger fully, then
it.
7

Sandingoperation
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 work-
piece at all timesand movethe tool back and forth. Neverforce the
tool. The weight of the
tool applies adequate pressure. Excessivepressure may cause stalling,overheating of the
motor, burning of the workpiece and possible kickback.
.
ConnectingtoMakita vacuum cleaner or dust collector
Cleaner sanding operations can be performed by connecting the belt sander to Makita
vacuum cleaner or dust collector.
When connecting to Makita vacuum cleaner, an optional hose 28
mm (1-1/8")in inner dia.
or joint 25 is necessary.See the figure below.
When connecting to Makita dust collector (Model420.9, the optional hose or joint is not
necessary.You can connect the belt sander directly to the hose of the dust collector.
Makitavacuum cleaner Hose
for vacuum cleaner Hose
28 mm (1-1/8") in inner dia
Carbonplate (Optional Accessories)
For greater sanding efficiency and to help
the belt run cooler, install an optional
carbon plate on the steel plate when sand-
ing hardwoodor steel.
An
8

MAINTENANCE
CAUTION:
Always be sure that the tool
is switched off and unplugged before attempting to perform
inspection
or maintenance.
Remove and check the carbon brushes
regularly. Replacewhen they wear down to
the limit mark. Keep the carbon brushes
clean and free to slip in the holders. Both
carbon brushes should be replaced at the
same time. Use only identical carbon
brushes.
Use
a screwdriver to remove the brush
holder caps. Take out the worn carbon
brushes, insert the new ones and secure
the brush holder caps.
L Limit mark
To maintain product SAFETY and RELIABILITY,repairs, any other maintenance or adjust-
ment should be performed by Makita Authorized or Factory Service Centers, always using
Makita replacement parts.
9

ACCESSORIES
CAUTION
These accessories or attachments are recommended for use with your Makita tool specified in this
manual The use
of any other accessoriesor attachments might present a risk of injury to persons
The accessoriesor attachments should be used only in the properand intended manner
*Abrasive belts
For Model
9921
9403
Per Pkg
76x610
I3
100x 610
1
Part No
74231 2-8B
742312-8C
742312.80
794237-0-2
794237-C-2
794237-D-2
794237-E-2
742320-3
#60 742321-1
#80 I 742322-9
742323-7
742324-5
794133-F-2
- Carbonplate
Part No.
Dust bag
Part No.
10