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3DS
Manual
READ THIS BOOK
This book has important information for the use and safe operation of this machine. Failure to read this
book prior to operating or attempting any service or maintenance procedure to your ALTO machine could
result in injury to you or to other personnel; damage to the machine or to other property could occur as
well. You must have training in the operation of this machine before using it. If you cannot read English,
have this manual explained fully before attempting to operate this machine.
Si Ud. o sus operadores no pueden leer el Inglés, se hagan explicar este manual completamente antes
de tratar el manejo o servicio de esta máquina.
All directions given in this book are as seen from the operator’s position at the rear of the machine.
For new books write to: ALTO U.S. Inc., 2100 Highway 265, Springdale, Arkansas 72764.
Form No. 74845A 3/01 AMERICAN SANDERS TECHNOLOGY Printed in the U.S.A.
Contents of this Book
Operator Safety Instructions........................................................3
Explanation of Hazard Symbols ...................................................4
Introduction and Machine Specifications ......................................5
Instructions On Connection To Power Supply 230 Volt................6
Machine Breakdown/Transportation ............................................7
Machine Set-Up ...........................................................................9
Operating Instructions................................................................10
Maintenance ..............................................................................11
User Maintenance................................................................11
Service Maintenance............................................................11
Section II Parts and Service Manual
Troubleshooting .........................................................................14
Sanding Cuts and Sandpaper ....................................................15
Accessories ...............................................................................16
Assembly Drawing #1 ................................................................18
Assembly Parts List #1..............................................................19
Assembly Drawing #2 ................................................................20
Assembly Parts List #2..............................................................21
Electrical Schematic ..................................................................22
Page 2 AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS
OPERATOR SAFETY INSTRUCTIONS
WARNING AVERTISSEMENT ADVERTENCIA
DANGER means: Severe bodily injury or death can or will occur to you or other personnel if
the DANGER statements found on this machine or in this Operator's Manual
are ignored or are not adhered to. Read and observe all DANGER state-
ments found in this Operator's Manual and on your machine.
WARNING means: Severe injury can occur to you or to other personnel if the WARNING
statements found on your machine or in this Operator's Manual are ignored
or are not adhered to. Read and observe all WARNING statements found in
this Operator's Manual and on your machine.
CAUTION means: Minor personnal injury, property damage, or damage to machine can occur if
the CAUTION statements found on your machine or in this Owner's Manual
are ignored or are not adhered to. Read and observe all CAUTION state-
ments found in this Operator's Manual and on your machine.
DANGER: Failure to read the Operator's Manual prior to operating or servicing your machine could
result in injury to you or to other personnel; damage to the machine or to other property could
occur as well. You must have training in the operation of this machine before using it. If you
cannot read English, have this manual explained fully before attempting to operate
this machine.
DANGER: Operating a machine that is not completely or fully assembled can result in injury to the
operator or property damage. Do not operate this machine until it is completely assembled.
Keep all fasteners tight. Keep adjustments according to machine specifications.
DANGER: Explosive materials, severe bodily injury or death can occur. Sanding/finishing wood floors
can create an explosive or combustible environment. Do not operate this machine around
solvents, thinners, alcohol, fuels, floor finishes, wood dust or any other flammable materials.
Vapors and wood dust generated by sanding or finishing wood flooring can create an
explosive environment. Cigarette lighters, pilot lights, electrical sparks and all other sources
of ignition should be extinguished or avoided. Keep work area
well ventilated.
DANGER: Dust generated from sanding wood floors can spontaneously ignite or explode. Promptly
dispose of any sanding dust in a metal container clear of any combustibles. Do not dispose
in a fire.
DANGER: Electrocution could occur if the machine is being serviced while the machine is connected
to a power source. Disconnect the power supply before servicing. Always remove the
electrical plug from the power source before changing the brush pad or other attachment.
Always disconnect the power supply before leaving the machine.
DANGER: Electrocution or fire could occur if the machine is being operated with a damaged power
cord. Keep the power cord clear of the pad. Always lift the cord over the machine. Do not
move the machine by the power cord.
DANGER: Electrocution could occur if the machine is used on an ungrounded electrical circuit. Always
use a three-wire electrical system connected to the electrial ground. Never remove or
disable the grounding supply conductor on the electrical cord. Consult an electrician if the
grounding conductor is missingf or if you suspect your circuit is not grounded properly.
WARNING: Always use a three-wire electrical system connected to the electrical ground. For maximum
protection against electric shock, use a circuit that is protected by a ground fault interrupter.
Consult your electrical contractor.
AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS Page 3
DANGER: To avoid injury keep hands, feet, and loose clothing away from all moving parts on the
machine. Disconnect the power cord before replacing the pad, changing the abrasive, or
when servicing. Do not operate the machine unless all guards are in place. Never leave
the machine unattended while connected to a power source.
WARNING: Shock hazard. Electrical components of this machine can “short-out” if exposed to water
or moisture. Keep the electrical components of the machine dry. Wipe the machine down
after each use. For storage, keep the machine in a dry building.
WARNING: Injury can occur if protective clothing or equipment is not used while sanding. Always wear
safety goggles, protective clothing, and dust mask while sanding.
WARNING: Any alterations or modifications of this machine could result in damage to the machine or
injury to the operator or other bystanders. Alterations or modifications not authorized by the
manufacturer voids any and all warranties and liabilities.
WARNING: Operating a machine without observing all labels and instructional information could result
in injury to the operator or damage to the machine. Read all machine labels before
attempting to operate the machine. Make sure all of the labels and instructional information
are attached or fastened to the machine. Get replacement labels and decals from your
authorized distributor.
WARNING: The machine is heavy. Injury could occur to the operator or other bystanders unless proper
lifting procedures are used. Get help to lift the machine.
Explosion
Electrical Shock
Failure to read operator’s manual could result in injury to operator or damage to
machine.
The symbol of a flame shows that the material can ignite and burn you.
The symbol of a man with voltage going through him depicts electrocution
or shock. This can cause death or severe injury.
This symbol refers to the danger of moving parts. Injury can occur.
This symbol of a person wearing goggles warns of injuries to eyes.
Moving parts
Eye Protection
Heavy Object
Read Owner’s Manual
Explanation of Hazard Symbols
This symbol of a man lifting shows that injury could occur without proper
lifting procedures.
Page 4 AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS
Introduction & Machine Specifications
The 3DS is a machine designed primarily for fine finish sanding of hardwood floors. The finish sanding process results
in a smoother and flatter floor and assists in removing imperfections created during the drum or belt sanding process.
This machine can not be used on wet surfaces.
PRODUCT SPECIFICA TIONS
Machine Code 07082C 07085C
Machine Type:
Motor:
Voltage:
Frequency:
Current:
Fuse:
Insulation Class:
Sanding Pad Diameter:
Speed of Sanding Pad: (rpm)
Speed of Sanding
Gear Housing: (rpm)
Weight of Sanding Unit:
Weight of Chassis:
To tal Weight (w/o vacuum):
To tal Weight (with vacuum):
Length:
Width:
Height (assembled):
Filter dimension (cloth):
Filter dimension (paper):
Filtration (cloth):
Filtration (paper):
Shipping Weight w/vacuum):
Shipping Weight w/o vacuum):
Noise Emission
(with vacuum unrestricted):
Noise Emission
(w/o vacuum unrestricted):
Working Diameter:
Power Cable
Rubber Jacketed
60 Hz 50Hz
8” 20.32cm
35” 88 cm
20” 51 cm
39.5” 100 cm
234 lbs. 106 kg
212 lbs. 96 kg
18.75” 48 cm
40’ 12-3 Cord 15 meters
3 Disc Dry Sanding
3 HP Single Phase
230 Volt
11.5 Amps
15 Amps
F
717 (Loaded)
170 (Loaded)
109 lbs. (49.44 kg.)
37 lbs.(16.78 kg.)
146 lbs.(66.36 kg.)
163 lbs.(74.09 kg.)
950 sq. cm.
5310 sq. cm.
15 microns
12 microns
76 dBA
73 dBA
AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS Page 5
Grounding Instructions - 230 V olt
230 VOLT MACHINES
INSTRUCTIONS FOR CONNECTION
TO THE POWER SUPPLY
AND THE ELECTRICAL GROUND
CAUTION: To avoid damage to the machine op-
erate only on AC frequency and electrical voltage shown on the nameplate. Make sure you have the correct frequency and voltage before
connecting the power cord to an outlet.
This product must be grounded. If it should malfunction or breakdown, grounding provides a path of
least resistance for electric current to reduce the
risk of electric shock. This product is equipped with
a cord having an equipment-grounding conductor
and grounding plug. The plug must be inserted into
an appropriate outlet that is properly installed and
grounded in accordance with all local codes and
ordinances.
WARNING: Improper connection of the equip-
ment-grounding conductor can result in a risk of electric shock.
Check with a qualified electrician
or service person if you are in doubt
as to whether the outlet is properly
grounded. Do not modify the plug
provided with the product - if it will
not fit the outlet, have a proper outlet installed by a qualified electrician.
This product is for use on a nominal 230 volt circuit
and has a grounding attachment plug that looks like
one of the plugs illustrated in Fig. 1. Make sure that
the product is connected to an outlet having the
same configuration as the plug. No adaptor should
be used with this product.
NEMA L6-20P
IEC-309 16A-6h/200-250 V ac
Figure 1
WARNING: To avoid electrical shock always use
this machine with an AC three-conductor electrical system connected
to the electrical ground. Replace
any worn, cut or damaged cords.
Replace any damaged plugs, receptacles, or connector bodies. Do
not move the machine over an electrical cord. Always lift the cord over
the machine.
EXTENSION CORDS
Use only an approved extension cord with two
main conductors and one earthing conductor. The
machine has a power cord with wire size 12 A WG
or 2.5mm2.
WARNING:To avoid motor burnout, if you use
an extension cord, use an extension
cord with minimum wire size of 10
AWG or 4.0mm2. Do not use an extension cord longer than 40 feet or
15 meters. Do not join two extension cords.
WARNING:T o avoid electrical shock, do not cut,
This machine must be connected to the electrical
ground to protect the operator from electrical shock.
The machine has a power cord with two main conductors and one earthing conductor. Connect the plug
to the receptacle. The green or green and yellow conductor in the cord is the ground wire. Never connect
this wire to any terminal other than the ground terminal.
Page 6 AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS
remove or break the ground terminal. Do not try to fit a three-terminal plug into a receptacle or connector body that does not fit the plug. If
the receptacle or connector body
does not fit the plug, see your authorized American Sanders T echnology dealer to get an authorized person to make the connection.
Machine Breakdown/T ransportation
To break down the machine, follow this procedure:
1. Unplug machine from wall and wrap cord.
WARNING: Injury to the operator or bystanders
could occur if the power supply remains connected when servicing the
equipment, changing abrasive, or
empting the dust bag.
2. Unplug the power cord, motor cord, and vacuum
from electric box.
3. Disconnect the vacuum hose from the sanding unit.
Ü
Figure 2
4. Remove both hand knobs from the sanding unit
and separate sanding unit from truck frame.
(see Figure 2)
WARNING: The sanding unit is heavy (109 lbs.).
T o avoid injury to the operator or damage to the machine use a firm grip
and proper lifting technique. Get assistance if necessary.
5. To lift the sanding unit grasp the assembly at the
lifting sites. (see Figure 3)
6. Unwrap the vacuum power cord from the cleats on
the handle and place on vacuum head.
7. Disconnect the vacuum straps by unhinging the
draw latch. The vacuum strap will spring back and
the vacuum can be lifted off the truck frame. (See
Figure 4)
8. The handle may be taken off by removing the four
5/16-18 bolts and nuts that secure it to the truck
frame.
Ü
Ü
Figure 3
Ü
Figure 4
9. Secure all elements in cargo area when transport-
ing to avoid damage to the machine.
How to Move Machine (Room to Room)
When moving the machine short distances (room to room)
it may be moved by tilting it back until the 4” diameter wheels
contact the floor. With steady downward pressure on the
handle the machine can be pushed to the desired location.
(see Figure 5)
Ü
Figure 5
AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS Page 7
Machine Setup
Listed below are the tools needed for setup of the
machine: 1 - #2 Phillips screwdriver
To prepare the machine for use, follow this procedure:
2 - ½” open end wrenches or (2) adjustable
wrenches.
1. Remove all components of the machine from its
package and check for damaged or missing parts.
2. Read Operation and Parts Manual, including all
danger, warning, and caution statements before
operating the machine. If you or the operator are
unable to read the language this manual is printed
in, have the manual fully explained before attempting to operate this machine.
3. Attach the sanding unit to the truck frame by securing the two hand knobs through the truck frame
to the sanding unit. (see Figure 6). The eccentrics in the truck frame should be used for proper
alignment between the truck frame and sanding
unit. Match tick marks on spacers and frame;
one on right and two on left.
4. Route the motor power cable under the head pressure strap and vacuum support strap, then over
the tilt assist strap.
5. Secure the handle assembly to the truck frame by
bolting it on with the four 5/16-18 bolts and nyloc
nuts supplied and plug in motor power cord. (see
Figure 7) Tighten the nuts that hold on the tilt
wheels and attach the vacuum support straps as
per figure 7.
6. Put Dacron filter around the cloth filter. (See Figure 8)
7. Set the dry vacuum on the vacuum support straps
with the center bottom in the 2” diameter hole.
NOTE: The vacuum hose port should be facing
the sanding unit motor. Attach the vacuum strap
around the base of the vacuum. (See Figure 9)
Ü
Figure 6
Ü
Figure 7
Ü
Figure 8
3DS
8. An optional disposable paper bag (60711A) is
9. Wrap the vacuum cord around the cleats located
available. If you wish to use the paper bag, remove the vacuum head and install a paper dust
control bag by inserting the deflector on the
vacuum into the mounting shoe of the paper bag.
To ensure the bag is properly seated on the deflector, the rubber seal should rest in the groove
of the deflector. (See Figure 10)
NOTE: Check the paper bag for proper seating
after transport to avoid dust in the vacuum tank.
on the back of the handle. Leave enough slack in
the cord to plug into the electric box. Turn the
vacuum switch to the “ON” position. The vacuum
switch should remain in the “ON” position. (See
Figure 1 1 below)
Ü
Figure 9
Ü
Ü
Ü
Figure 11
Page 8 AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS
Figure 10
Machine Setup (cont)
WARNING: Injury could occur to the operator or by-
standers if the machine should tip or fall
while replacing the pad or changing the
abrasive.
WARNING: Never allow the machine to be started
while tilted up. Severe injury could result if the machine is started while the
abrasive is being changed.
CAUTION: Damage to the sanding head will occur
if the unit is allowed to drop freely from
the tilted position.
CAUTION: Damage to the pad driver will occur if
the machine is operated without sandpaper or screen and pad. Damage to
the pad driver can also occur if the pad
is less than 1/8” thick.
10. Install or replace sandpaper or screen and pad. The
sandpaper, screen, and pad should be replaced if
there are any tears or if they have become worn and
dull. The pad should also be replaced if its thickness
is less than 1/8”. To inst all or replace the sandp aper ,
screen, or pad: (See Figure 12)
DANGER: Disconnect the power source. Electrocu-
tion could occur if the machine is connected to the power source while changing the abrasives, pads or empting the dust
bag.
Ü
Figure 12
Ü
Ü
Figure 13
a.) Unplug the machine from its power source and
move the power cord out of your way .
b.) Tilt the machine back by pressing on the tilt
assist strap with your foot while also pushing
down on the handle. (see Figure 13)
c.) Remove foot from tilt assist strap and con-
tinue to push down on the handle until the
machine rests in the up position on the handle
and tilt wheels. (see Figure 14)
d.) T o remove the existing paper or screen / pa d
stand to the side of the machine and pull from
one edge. The screen may have a plastic
pushpin in the center that will require removing prior to the screen’s removal.
(See Figure 15)
e.) Center the new paper or screen / pad over the
pad driver and press against the pad driver until
the hooks on the driver hold them in position.
WARNING: The machine is heavy . Keep others away
from the machine because of possible injury if the machine should tip or fall. When
replacing the pad or changing the abrasive use caution when tilting the machine.
The operator or other bystanders could be
injured.
f.) Return the machine to upright position by
standing behind the handle and raising it from
the floor until the caster wheels contact the
floor. Place your foot on the tilt assist strap
and ease the sanding unit to the floor.
Ü
Figure 14
Ü
Figure 15
11. Connect the vacuum hose to the sanding unit and
12. Connect the power cord to the electric box.
AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS Page 9
vacuum.
Operating Instructions - Sanding
To operate the machine, follow this procedure:
1. Move machine to work location. When sanding the area, work so that you are moving
away from the power supply. This will help
to avoid damaging the power cord and reduce the need to move the power cord as
frequently.
NOTE: For sanding cuts and sandpaper, see
page 13.
WARNING: Injury can occur if the machine is
connected to a power source
while installing or replacing the
abrasives. Disconnect the machine before installing the abrasives.
2. Install the abrasive. Use the same procedure outlined in MACHINE SETUP for installing the sandpaper or screen / pad.
(See Page 5)
DANGER: Electrocution could occur if the
machine is used on an ungrounded electrical circuit. Always use a three-wire electrical
system connected to the electrical ground. Never remove or disable the grounding supply conductor on the electrical cord.
Consult an electrician if the
grounding conductor is missing
or if you suspect your circuit is
not grounded properly .
3. Koosen the head pressure until the rubber foot
is not touching the mainframe. (See Figure
16) Tighten until the rubber foot touches the
main frame. Adjust to suit by running the machine, then making adjustments either up or
down to get sanding action desired.
Ü
Figure 16
4. Connect machine’s power cord to an appropriately fused and grounded circuit.
5. Stand behind the handle, place the rocker
switch to “Automatic” and press the green
start switch. To stop the machine, press the
red stop button. (See Figure 17)
CAUTION: To prevent possible damage to
the flooring and to reduce heat
buildup, keep the machine in motion while the motor is running.
6. The operator must be moving the machine
when the machine is running. The operator
may move the machine in any direction when
sanding the floor.
Page 10 AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS
Auto
Manual
Ü
Handle
Figure 17
Start
Stop
Maintenance
User Maintenance:
The paper bags should be replaced after every 3 hours
of use, minimum. Paper bags may need to be replaced
more often with heavy cutting and softer wood types.
NOTE: Before paper bags are replaced, the machine
must be vacuumed to remove all dust and the cloth filter
must be cleaned to remove accumulated dust. (See the
DTV-7 Operator’s Manual for instructions on how to
clean the cloth filter)
When changing the sanding paper or screen, the foam
and dual lock “velcro” on the sanding pads should be
checked for any frays, wear, or damage.
Service Maintenance:
The 3DS Sander must be serviced after every 600
hours of use. Contact an authorized Alto Service
Center/Person for service. (The Service Centers are
listed on the inside back cover of the Operator’s
Manual).
The following service should include:
1. Check and/or change the brushes and commutator in the vacuum motor (See DTV-7
operator’s manual).
2. Check the rubber grommets on the sanding
pads for wear and tear; replace if damaged.
3. Check foam on sanding pads for wear and tear;
replace if damaged.
4. Check the drive mechanisms for wear, i.e. belts,
pulleys, motor shaft.
5. Blow accumulated dust out of vacuum motor.
6. Clean cloth filter on vacuum.
In addition to the above the following service should
be done:
1. After 1500 hours the drive belt should be
replaced.
2. After 3000 hours the bearings on the drive
pulleys should be replaced.
AMERICAN SANDERS TECHNOLOGY Operator’s Manual - 3DS Page 11
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