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American 12
User Manual
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Nilfisk American 12 User Manual

Operator's
American
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 operator(s) cannot read this manual, have it explained fully before attempting to operate this machine.
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.
12
Form No. 78150C 6/01 AMERICAN SANDERS TECHNOLOGY Printed in the U.S.A.

Contents of this Book

Operator Safety Instructions ......................................................... 3
Introduction and Machine Specifications .......................................5
230V Electrical Connection Instructions ........................................ 6
How to Transport the Machine ......................................................7
Machine Set-Up ........................................................................... 8
How to Operate the Machine ......................................................10
Sanding Cuts and Sandpaper .................................................... 12
Sander Adjustment Procedures ..................................................14
Routine Maintenance ..................................................................16
Troubleshooting .........................................................................17
Wiring Diagram..........................................................................19
Assembly Drawing #1 ................................................................ 20
Assembly Parts List #1 ........................................................... 21
Assembly Drawing #2 ................................................................ 22
Assembly Parts List #2 ........................................................... 23
Assembly Drawing #3 ................................................................ 24
Assembly Parts List #3.............................................................25
Accessories Drawing & Parts List ..............................................26
Chatter-Wave Prevention ........................................................... 27
Page 2 AMERICAN SANDERS TECHNOLOGY - American 12 Floor Sander Owner's Manual

OPERATOR SAFETY INSTRUCTIONS

WARNING AVERTISSEMENT ADVERTENCIA
DANGER means: Severe bodily injury or death can occur to you or other personnel if the
DANGER statements found on this machine or in this Owner's Manual are
ignored or are not adhered to. Read and observe all DANGER statements found in this Owner's Manual and on your machine.
WARNING means: Injury can occur to you or to other personnel if the WARNING statements
found on your machine or in this Owner's Manual are ignored or are not adhered to. Read and observe all WARNING statements found in this Owner's Manual and on your machine.
CAUTION means: Damage can occur to the machine or to other property if the CAUTION state-
ments found on your machine or in this Owner's Manual are ignored or are not adhered to. Read and observe all CAUTION statements found in this Owner's Manual and on your machine.
DANGER: Failure to read the Owner's Manual prior to operating or attempting any service or mainte-
nance procedure to your American Sanders Technology 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 or
your operator(s) cannot read English, have this manual explained fully before attempting to operate this machine.
DANGER: Sanding/finishing wood floors can create an environment that can be explosive. The
following safety procedures must be adhered to:
• Cigarette lighters, pilot lights and any other source of ignition can create an explosion when active during a sanding session. All sources of ignition should be extinguished or removed entirely if possible from the work area.
• Work areas that are poorly ventilated can create an explosive environment when certain combustible materials are in the atmosphere, i.e., solvents, thinners, alcohol, fuels, certain finishes, wood dust and other combustible materials. Floor sanding machines can cause flammable material and vapors to burn. Read the manufacturer's label on all chemicals used to determine combustibility. Keep the work area well ventilated.
• Spontaneous combustion or an explosion can occur when working with sanding dust. The sanding dust can ignite and cause injury or damage. Sanding dust should be disposed of properly. Always empty the sanding dust into a metal container that is located outside of any building(s).
• Remove the contents of the dust bag when the bag is 1/3 full. Remove the contents of the dust bag each time you finish using the machine. Never leave a dust bag unattended with sanding dust in it.
• Do not empty the contents of the dust bag into a fire.
• Hitting a nail while sanding can cause sparks and create an explosion or fire. Always use a hammer and punch to countersink all nails before sanding floors.
DANGER: Operating a machine that is not completely or fully assembled could result in injury or
property damage. Do not operate this machine until it is completely assembled. Keep all fasteners tight. Keep adjustments according to machine specifications.
AMERICAN SANDERS TECHNOLOGY -American 12 Floor Sander Operator's Manual
Page 3
DANGER: Electrocution could occur if the machine is used on a power circuit that repeatedly trips or is
undersized. Have a licensed electrician check the fuse, circuit breaker or power supply.
DANGER: Electrocution could occur if maintenance and repairs are performed on a unit that is not
properly disconnected from the power source. Disconnect the power supply before attempting any maintenance or service.
DANGER: Electrocution could occur if machine is used on ungrounded electrical circuit. 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.
DANGER: Use of this machine with a damaged power cord could result in an electrical shock. Do not
use the machine if the power cord is damaged. Do not use the electrical cord to move the machine.
DANGER: Electrocution or injury could occur if the power cord is run over or damaged by the sander.
Keep the cord free from under the machine to avoid contact with the sandpaper. Always lift the power cord over the machine.
DANGER: Moving parts of this machine can cause serious injury and/or damage. Keep hands, feet and
loose clothing away from all moving parts of the sander.
DANGER: Operating a sander without all guards, doors or covers in place can cause an injury or damage.
Always check to make sure that all of the guards, doors and covers are secure and in place.
DANGER: Injury to the operator or bystanders could occur if the power supply remains connected when
servicing the equipment, changing the abrasive, or emptying the dust bag.
WARNING: Failure to read and observe all safety statements found on your machine or in this Owner's
Manual can result in serious injury or damage. Read and observe all safety statements. Make sure that all labels, decals, warnings, cautions, and instructions are fastened to the machine. Get new labels from your authorized American Sanders Technology distributor.
WARNING: Sanding dust can be airborne and can be breathed in while operating a sander. Always wear
a dust mask while operating sanding equipment.
WARNING: Injury to the eyes and/or body can occur if protective clothing and/or equipment is not worn
while sanding. Always wear safety goggles, protective clothing, and a dust mask while performing any sanding operation.
WARNING: Bodily injury could occur if power is applied to the machine with the power switch already in
the "ON" position. Always check to assure that the power switch is in the "OFF" position before applying power to the power cable.
CAUTION: Maintenance and repairs performed by unauthorized personnel could result in damage or
injury. Maintenance and repairs performed by unauthorized personnel will void your warranty. Servicing of this unit must always be referred to an authorized American Sanders Technology distributor.
CAUTION: Use of this machine to move other objects or to climb on could result in injury or damage. Do
not use this machine as a step or furniture. Do not ride on this machine.
CAUTION: Damage could occur to the machine if not properly kept in a dry building for storage. Store
the machine in a dry building.
CAUTION: The machine is heavy. When transporting the machine, remove the motor. Get help to lift
the machine and motor.
CAUTION: Serious damage to the floor can occur if the machine is left running in one spot while the
sanding drum is in contact with the floor. To avoid damage to the floor, feather cut in at a normal sanding rate. Do not dwell while lowering or raising the contact wheel. Always sand at a constant rate.
Page 4 AMERICAN SANDERS TECHNOLOGY - American 12 Floor Sander Owner's Manual

Introduction and Machine Specifications

Motor Starter / Protector
Sanding Pressure Adjustment
Tool Storage Tray
Operating Controls
Operating Controls
Leveling Adjustment
PART NUMBER 07044C 07108A 07049C 07109A
Abrasive Size 12 x 261/8 (30.5cmx67.3cm) paperback Contact Wheel Speed 2000/2400 rpm (revolutions per min.) Abrasive Speed 3796/4555 sfm (surface feet per min.) Dust Fan Speed 5000 rpm (revolutions per minute) Dust Fan Flow 280 cfm (cubic feet per minute) Motor 60 Hz 230V 4hp (3 kW) 50 Hz 240V 3hp (2.2 kW) Leveling Control Externally Adjustable Operating Control Adjustable Lever Motor Starter/Protector Magnetic Circuit Breaker Sanding Pressure Adjustment Infinitely Adjustable Wheels (Front) Steel Urethane Steel Urethane Wheel (Adjustment) Steel Canvas Steel Canvas Drive V-Belt Dimensions 40½ x 15 x 36 3/4 Weight 240 lbs. (98 kg)
(102.9cm x 38.1cm x 93.3cm)
CAUTION: Your equipment may be inappropriate on some installations. Some softer
woods used in flooring cannot support the pressure created by hard wheels. A felt or rubber wheel should be used when these woods are encountered. See parts list for optional wheels.
Always consult with the flooring manufacturer on the proper installation, preparation, and finishing of their product. Determine suitability of your equipment in preparing the product.
AMERICAN SANDERS TECHNOLOGY -American 12 Floor Sander Operator's Manual
Page 5

230V Electrical Connection Instructions

CAUTION: This machine will operate only on AC frequency and on electrical voltage shown on the
motor nameplate. Make sure you have the correct frequency and voltage before connecting the power cord to an outlet. The machine has a plug as shown below.
This machine must be connected to an electrically ground circuit in order to protect the operator from electric shock. This machine has an approved power cord with three conductors as well as a plug with three terminals. Connect the plug into a three holed receptacle. For maximum protection against electric shock, use a circuit that is protected by a ground fault circuit interrupter.
DANGER: Electrocution could occur if the machine is exposed to water or rain. Keep the machine
in a dry building.
DANGER: Electrocution could occur if machine is improperly connected to the electrical system. To
prevent possible electric shock, always use a 3-wire electrical system connected to an electrical ground. For maximum protection against electrical shock, use a circuit that is protected by a ground fault circuit interrupter. Consult your electrical contractor.
DANGER: Electrocution could occur if the ground pin is tampered with in any way. Do not cut,
remove, or break the ground pin. Do not try to fit a three-terminal plug into a receptacle or connector body other than a three plug receptacle or connector body. If the outlet does not fit the plug, consult your electrical contractor.
DANGER: Electrocution could occur if the machine is used with a damaged plug or power cord. If
the cords or plugs are worn or damaged in any way, have them replaced by an authorized service person or electrician.
Extension Cords
Use only an approved three-pronged extension cord with two main conductors and one earthing conductor. This machine’s power cord has a wire size of 10 gauge. This machine is equipped with a 100' power cord. When greater range is needed follow the table below to determine cable guage of additional footage. Refer to the following chart for extension cord information.
Feet/Wire Guage (Stranded Copper)
Source Voltage 0 - 100' 100 - 250'
208 6
Use Voltage
Booster
230 10 8
If motor appears to labor or takes a considerable longer time to come up to speed reduce sanding pressure.
Page 6 AMERICAN SANDERS TECHNOLOGY - American 12 Floor Sander Owner's Manual

How to Transport the Machine

WARNING: The machine is heavy. Remove
the motor from the machine before transporting. Get help loading the machine and motor.
To transport the machine, follow this procedure:
1. Make sure the power cable is disconnected from the electrical outlet.
2. Disconnect the handle plug connection. See figure 1.
3. Remove the belt cover.
4. Remove the fan belt.
5. Loosen the motor bolt. Using the ¾" wrench, turn the motor bolt counterclockwise. See figure 2.
6. Slide the motor forward.
7. Remove the drive belt.
8. Remove the motor from the chassis.
To re-assemble the machine after transporting, follow this procedure:
1. Reposition motor on chassis.
2. Install the drum belt. Slide the motor back until adequate tension is achieved in belt.
CAUTION: To prevent damage to the floor
surface, make sure the drive belt is tight.
3. Resecure the motor to the chassis.
Figure 1
Figure 2
4. Install the fan belt.
5. Install the belt cover.
6. Reconnect the handle plug.
AMERICAN SANDERS TECHNOLOGY -American 12 Floor Sander Operator's Manual
Page 7
Machine Set-Up
To set-up your machine follow this procedure:
1. Familiarize yourself with the machine and read all danger, warning and caution statements. Make sure all operators of this machine have read this Owner's Manual. If they cannot read English, have the manual explained fully before allowing anyone to operate the sander.
2. Locate the power supply. The receptacle should be compatible with the plug. The receptacle must be grounded and must be fused (30 amp) to avoid an electrical hazard.
3. Clip the dust bag to the elbow. Cross the strings on the dust bag and draw tight over the flare on the elbow. Wrap the string around the elbow and secure.
4. Wind the power cord through the cable arm. Keep the power cord out of path of equipment.
How To Install The Abrasive
WARNING: Disconnect power before
changing abrasive.
To install the abrasive, follow this procedure:
1. Prepare abrasive with template supplied.
2. Place backing of abrasive on the template. The template is marked "This Side Up." Make sure the marked side of the template is facing up.
3. Cut the abrasive to the exact lenght of the tem­plate.
4. Align one edge of the abrasive with a notch in the template.
5. Fold the other end of the abrasive over the end of the template and crease.
6. Repeat steps 4 and 5 for remaining notch.
7. Lift the drum cover.
Page 8 AMERICAN SANDERS TECHNOLOGY - American 12 Floor Sander Owner's Manual
8. Put the smooth side of the abrasive against
the sanding drum.
9. Put one end of the abrasive against the
sanding drum slot (1). See figure 3.
10. Turn the drum one revolution. Put the other
end of the abrasive in the drum slot (2).
See figure 3.
11. Tighten the abrasive.
To tighten the abrasive, follow this procedure:
1. The end wrenches are given with the machine. Put a wrench around the nut at each end of the durm (1). See figure 4.
2. Make sure the flat sides of the nuts are parallel with the drum slot.
3. Turn the wrenches the opposite rotation until the abrasive is tight against the drum (2). See figure 4.
12. Remove the end wrenches.
13. Close the cover.
NOTE: When using #4 or 4½ grit abrasive,
remove the large grains from the folded ends. To remove the grains, rub the folded ends together.
Figure 3
Figure 4
AMERICAN SANDERS TECHNOLOGY -American 12 Floor Sander Operator's Manual
Page 9
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