American Sanders American 12 07044C User manual

Form No. 78150D 5/06 revised 3/10
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 Clarke American
Sanders 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.
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.
American 12
Operator's Manual
Models: 07044C, 07108A, 07120A, 07049C, 07109A

Page 2 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
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
SECTION II - Parts and Service Manual
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
Wiring Diagram.......................................................................... 27
Chatter-Wave Prevention .......................................................... 28
WARNING!
The Products sold with this Manual contain or may contain chemicals that are known to certain governments (such as the State of
California, as identified in its Proposition 65 Regulatory Warning Law) to cause cancer, birth defects or other reproductive harm. In
certain locations (including the State of California) purchasers of these Products that place them in service at an employment job site
or a publicly accessible space are required by regulation to make certain notices, warnings or disclosures regarding the chemicals
that are or may be contained in the Products at or about such work sites. It is the purchaser’s responsibility to know the content of,
and to comply with, any laws and regulations relating to the use of these Products in such environments. The Manufacturer disclaims
any responsibility to advise purchasers of any specific requirements that may be applicable to the use of the Products in such
environments.
revised 3/10

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 3
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 Operator's Manual are
ignored or are not adhered to. Read and observe all DANGER statements
found in this Operator'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 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: Damage can occur to the machine or to other property if the CAUTION state-
ments found on your machine or in this Operator's Manual are ignored or are
not adhered to. Read and observe all CAUTION statements found in this
Operator's Manual and on your machine.
DANGER: Failure to read the Operator's Manual before operating or servicing this sanding equip-
ment could result in injury to the operator or to bystanders and could cause damage to
the equipment. Read and observe all safety statements found in this manual and on the
sanding equipment. Make sure all labels, decals, warnings, cautions and instructions are
fastened to the equipment. Replace any that are damaged or missing. You must have
training in the operation of this equipment before using it. If the operator is unable to
read this manual, have it explained fully before they attempt to use this equipment.
DANGER: Sanding/finishing wood floors can create an environment that can be explosive. The fol-
lowing 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
equipment can cause flammable material and vapors to burn. Read the manufactur-
er'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 self-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 equipment. Never leave a dust bag unat-
tended 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.
OPERATOR SAFETY INSTRUCTIONS
WARNING AVERTISSEMENT ADVERTENCIA

Page 4 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
DANGER: Operating partially assembled sanding equipment could result in injury to the operator or by-
stander and could cause damage to the equipment or to other property.
• Do not operate this equipment unless it it fully assembled and all guards, doors and covers
are secured.
• Keep all fasteners tight.
• Keep all adjustments within manufacturers specifications.
DANGER: Moving parts on this sanding equipment can cause injury to the operator or bystanders.
• Keep hands, feet and loose clothing away from all moving parts.
• Do not change or adjust the abrasive while the sanding equipment is running.
• Do not service the sanding equipment while it is running.
DANGER: This sanding equipment requires a supply of electricity. Improper use could result in electrical
shock or fire.
• Connect only to an electrical source matching what is shown on the equipment nameplate.
• Do not use this sanding equipment on an ungrounded electrical circuit. Consult an electri-
cian if you suspect the circuit is not properly grounded.
• Do not use this sanding equipment with a damaged electrical cord. Inspect before each
use.
• Avoid striking the elelctrical cord with the abrasive. Always lift the electrical cord over the
sanding equipment.
• Do not use the electrical cord to move the sanding equipment.
• Disconnect the electrical source before servicing this equipment.
WARNING: In the event of a bag fire, injury can occur to the operator if the operator is tied or strapped to
equipment. Use operating belt properly ( follow procedure on page 11).
WARNING: Injury to the operator or bystander can occur if protective gear is not worn while sanding. Always
use eye, ear, and respiratory protection while performing any sanding operation.
WARNING: Bodily injury could occur if power is applied to the equipment with the power switch already in
the "ON" position. Always check to assure that the power switch is in the "OFF" position before
connecting power supply.
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 Clarke American Sanders distributor.
CAUTION: Use of this equipment to move other objects or to climb on could result in injury or damage. Do
not use this equipment as a step or furniture. Do not ride on this equipment.
CAUTION: Damage could occur to the equipment if not properly kept in a dry building for storage. Store
the equipment in a dry building.
CAUTION: The equipment is heavy. When transporting the equipment, remove the motor. Get help to lift
the equipment and motor.
CAUTION: Serious damage to the floor can occur if the sanding equipment 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.

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 5
Introduction and Machine Specifications
Operating Controls
Operating Controls
Leveling Adjustment
Tool Storage Tray
Sanding Pressure Adjustment
Motor Starter / Protector
MODEL 07108A / (07044C) 07109A / (07049C) 07120A
Electrical Requirements ~208-240V 60 Hz ~220-240V 50 Hz ~220-240V 50 Hz
Amperage 15.7 11.8 11.8
Sound Emisson (Lpm) 83.0 dB(A) 79.4 dB(A) 79.4 dB(A)
Vibration <.30 in/s < 2.5 m/s2< 2.5 m/s2
Contact Wheel Rate (rpm) 2000/2400 1670/2000 1670/2000
Abrasive Rate 3800/4560 ft/min 970/1160 m/min 970/1160 m/min
Fan Flow Rate 280 CFM 110 liters/s 110 liters/s
Abrasive Sheet Size 12" x 26 1/8" 305mm x 664mm 305mm x 664mm
Motor 4 Hp Continuous 2.2 kW Continuous 2.2 kW Continuous
Overload Protection Magnetic Circuit Breaker Magnetic Circuit Breaker 13 A Fuse
Operating Controls Adjustable Lever/Grip Adjustable Lever/Grip Adjustable Lever/Grip
Leveling Controls Externally Adjustable Externally Adjustable Externally Adjustable
Electrical Cable 100' 10-3 SJO with 100' 12-3 SJO with 15m HO7RN-F3GI .5
L6-20P Plug AU2-15P Plug with UK1-13P Plug
Operating Wheels 80 Durometer 80 Durometer 80 Durometer
Clear Urethane (Steel) Clear Urethane (Steel) Clear Urethane
Weight 240 lbs. 204 lbs. 92.7 kg
Dimensions 40½ x 15 x 36 3/4 40½ x 15 x 36 3/4 103cm x 38cm x 93cm
CAUTION: Your equipment may be inappropriate on some installations. Some softer woods
used in flooring cannot support the pressure created by hard wheels.
Always consult with the flooring manufacturer on the proper installation, prepa-
ration, and finishing of their product. Determine suitability of your equipment in
preparing the product.

Page 6 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
CAUTION: This machine will operate only on
AC frequency and on electrical
voltage shown on the equipment
nameplate. Make sure you have
the correct frequency and voltage
before connecting the power cord
to an outlet. See the example in
figure 1.
This machine must be connected to an electrical
source with an earthing conductor 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 to a
matching receptacle.
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 ma-
chine is not connected to an electri-
cal source with an earthing conduc-
tor. To prevent possible electric
shock, use an electrical cord with
an earthing conductor and connect
it to a matching electrical source.
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
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 is equipped with a power cord. When greater
range is needed follow the table below to determine
cable gauge of additional footage. Refer to the chart
to the right for extension cord information.
If motor appears to labor or takes a considerable longer
time to come up to speed reduce sanding pressure.
Source Voltage 0 - 100' 100 - 250'
Feet/Wire Guage (Stranded Copper)
208 6
230 10 8
Use Voltage
Booster
230V Electrical Connection Instructions
Figure 1

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 7
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.
4. Install the fan belt.
5. Install the belt cover.
6. Reconnect the handle plug.
Figure 1
Figure 2

Page 8 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
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 tem-
plate.
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.

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 9
8. Put the smooth side of the abrasive against
the sanding drum.
9. Put one end of the abrasive against the sand-
ing 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

Page 10 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
How to Operate the Machine
DANGER: Sanding/finishing wood floors
can create an environment that
can be explosive. 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 en-
tirely if possible from the work
area.
DANGER: Work areas that are poorly
ventilated can create an explo-
sive 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 ignite. Read the manufac-
turer's label on all chemicals
used to determine combustibil-
ity. Keep the work area well
ventilated.
DANGER: Sanding dust can spontaneous-
ly ignite and cause an injury or
damage. Sanding dust should
be disposed of properly. Always
empty the sanding dust into a
metal container. Remove the
contents of the dust bag when
the bag is 1/3 full.
DANGER: Sanding dust can spontane-
ously ignite and cause an injury
or damage. Remove the con-
tents of the dust bag each time
you finish using the machine.
Always dispose of the dust in a
metal container located outside
of the building. Never leave a
dust bag unattended with sand-
ing dust in it. Do not empty the
contents of the dust bag into a
fire.
DANGER: Hitting a nail while sanding can
cause sparks and create an
explosion or fire. Always use
a hammer and punch to coun-
tersink all nails before sanding
floors.

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 11
Figure 5
To operate the machine follow this procedure:
1. Install the operator's belt as follows:
a. Position the operator's belt around waist.
b. Cross the straps at the waist. See figure 5.
c. Slide the belt loop end over the handle on
the control lever side. Adjust the length as
needed.
d. Wrap the remaining strap around the op-
posite side of the handle and hold it in place
with your hand.
WARNING: Should quick release of the
machine be necessary, serious
operator injury could occur if
the operator has tied the loose
end of the operator's belt strap
to the machine. Always position
the strap so that you can let go
and get away quick in case of
bag fire or explosion.
2. Put the On/Off switch into the "ON" position.
DANGER: Serious damage can occur to the
floor surface if the machine is not
in motion while the contact wheel
is running on the floor surface. To
prevent damage to the surface,
make sure the machine is always
moving when the contact wheel
is in contact with the floor.
3. Work right to left. For each forward pass, move
the machine 4" over the pass you have just
finished. Retrace your reverse path without
overlapping. See figure 6.
4. Feather-cut in by easing the contact wheel down
onto the surface with the control lever while the
sander is in motion.
5. When contact wheel is fully engaged with the
surface, gradually adjust your pace for adequate
finish removal. Keep sander in motion while the
contact wheel is engaged with the surface or
dwell marks will occur.
6. Move the machine in the direction of the grain
in the wood whenever it is possible. Sand the
surface at a constant pace.
7. Gradually feather-cut out at the termination point
(the end of your pass) by easing the contact
wheel up with the control lever. Stagger the ter-
mination points for a better blend when edging.
8. Empty dust bag whenever it is 1/3 full. Never
leave a dust bag unattended with sanding dust
in it. Sanding dust can spontaneously ignite
and cause a fire or explosion. Empty dust into a
metal container located outside of the building.

Page 12 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
A. First pass forward, right to left.
C. Second pass forward, overlap ½ the drum width. D. Second pass reverse, retrace second path forward,
etc....for the entire room
B. First pass reverse, retrace same path.
E. Work the remaining unsanded floor in the
same fashion, right to left.
Figure 6

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 13
Sanding Cuts and Sandpaper
Initial Cut
The purpose of the initial cut is to remove old finish and gross imperfections on the floor surface. The sand-
ing equipment should be adjusted to heavy sanding pressure setting and a coarse abrasive should be used.
If the surface is severely damaged by deep scratches, pre-existing dwell marks, uneven planks, etc., it may
be necessary to sand across or diagonally to the grain to restore evenness to the surface. If these conditions
are not present, the initial cut should be done in the direction of the grain.
If glazing, loading, or burning takes place immediately into an initial cut, select a coarser abrasive. If this
should occur during an initial cut, the abrasive has dulled and must be replaced.
Final Cuts
The purpose of a finishing cut is to remove the scratches produced during the initial cut. Use a fine (60 - 80
grit) grain abrasive and a reduced sanding pressure setting.
If the surface remains rough after a finishing cut, it may be necessary to use an even finer grain of abrasive
(80 - 100 grit). Care should be taken in selecting the grit size of the abrasive. A very fine grain will close
the pores on a wood floor making admission of a stain difficult.
If glazing or burning should occur immediately into a finishing cut, reduce the sanding pressure. If it should
occur during a finishing cut, the abrasive has dulled and must be replaced.
945516
945517
945518
945519
12 grit
16 grit
20 grit
24 grit
For removing gross imperfections and restore evenness
to old flooring. To remove build-up of paints and varnishes.
30 grit For first sanding of new flooring (maple, oak). For removing 945520
36 grit minor imperfections and finishes from old flooring. 945521
40 grit For first sanding of new flooring (oak, walnut). For removing 945522
minor imperfections and finishes from old flooring.
50 grit For first sanding of new flooring (cedar, pine, fir) 945533
For clean-up of 16 grit.
60 grit For clean-up from initial cut 36 - 40 grit. 945544
80 grit For final sanding of certain hardwoods. For clean-up 945545
of initial cuts (50 grit).
100 grit For final sanding of certain hardwoods where a smooth 945546
surface is desired.
120 grit For final sanding of certain conifers. 945547
150 grit For final sanding of certain conifers where a smooth 945548
surface is desired.
180 grit For surface roughing between coats of finish. 945549
Abrasive Bulk Roll
Note: All part numbers listed are for 12" x 50' (30.5 cm x 18m)
Part No.
Grain Use

Page 14 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
Sander Adjustment Procedures
DANGER: Electrocution could occur if main-
tenance and repairs are performed
on a unit that is not properly dis-
connected from the power source.
Disconnect the power supply be-
fore attempting any maintenance
or service.
DANGER: Moving parts of this machine can
cause serious injury and/or dam-
age. Keep hands, feet and loose
clothing away from all moving parts
of the sander.
Sanding Pressure
To adjust the sanding pressure follow this procedure:
1. Screw the sanding pressure knob down to in-
crease the sanding pressure when making the
roughing in cut.
2. Screw the sanding pressure knob up to decrease
the sanding pressure when making the finishing
cut.
Drum Rates
The machine can be operated at two rates. To
change the speed of the drum, follow this procedure:
1. Remove the belt cover.
2. Remove the fan belt.
3. Loosen the motor bolt.
4. Slide the motor forward.
5. For high drum rates, install drive belt in larger
diameter of the grooves available on the mo-
tor pulley and in the smaller diameter of the two
grooves available on the drum pulley. For lower
rates, install drive belt in smaller diameter of the
grooves available on the motor pulley and in the
larger diameter of the two grooves available on
the drum pulley.
6. Tighten belt and secure motor to chassis.
7. Install the fan belt.
8. Install the belt guard.

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 15
Figure 7
Figure 8
Figure 9
Leveling
If the sanding drum is out of adjustment, follow this
procedure:
1. Remove the belt cover.
2. Loosen the eccentric lock screw. Using the 7/16"
wrench, turn the eccentric lock screw (1) counter-
clockwise. See figure 7.
3. To raise or lower the drum, turn the eccentric (2).
See figure 7.
4. Tighten the eccentric lock screw. To tighten the
eccentric lock screw, turn the screw clockwise.
5. Install the belt cover.
How to Lubricate the Wheel Pivots
NOTE: The wheel pivots must be lubricated after
every 25 hours of use.
To lubricate the wheel pivots, follow this procedure:
1. Put the machine on its side.
2. Lubricate the pivots. The pivots are behind the
truck wheels. See figure 8.
3. Put the machine on its wheels.
Operating Control
To increase the travel or extend the reach on the
grip control follow this procedure:
1. Loosen the locknut on the control rod.
See figure 9.
2. Screw the control rod adjuster in until the desired
reach is found.
3. Tighten the locknut.
To decrease the travel or reduce the reach on the
grip control follow this procedure:
1. Loosen the locknut on the control rod.
See figure 9.
2. Screw the control rod adjuster out until desired
reach is found.
3. Tighten the locknut.

Page 16 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
Routine Maintenance
The following items need to be periodically inspected
and maintained to keep your sander in good working
condition.
Wheels
Periodically remove the debris from the truck and
caster wheels. Debris can cause waves on a sanded
surface. Lubricate truck mechanism every 25 hours
of use. The machine is equipped with lubrication
fittings and are located on shaft supporting mecha-
nism.
Dust Bag
Remove the dust bag from the machine and shake it
thoroughly to remove the sanding dust from the dust
bag. Turn the dust bag inside out and machine wash
in cold water to prevent pore blockage and loss of
dust recovery.
Drive Belt
Periodically check the drive belt tension.
Bearings
Periodically check the bearings for wear or damage
according to the following schedule:
Idler pulley after 1st 1500 hrs.
Fan shaft after 1st 2500 hrs.
Arbor shaft after 1st 5000 hrs.
Motor shaft after 1st 5000 hrs.

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 17
Drive belts slip. Insufficient tension. Tension drive belt.
(Squeaking or squealing sound)
Worn belts. Replace belts.
Squealing, growling or grinding Damaged and/or worn bearing. Remove drive belts, rotate arbor
noise coming from machine. motor, fan, shafts and idler pulley to
locate dragging or rough bearing.
Contact an authorized Clarke American
Sanders dealer.
Dust pick-up is poor. Dust bag is over 1/3 full. Empty contents of bag.
Dust bag is dirty. Shake debris from bag and wash.
Dust chute is obstructed. Remove fan cover and clear throat.
Motor will not start. Defective motor starter. Contact an authorized Clarke American
Sanders dealer.
Defective start capacitor. Contact an authorized Clarke American
Sanders dealer.
Defective electronic start switch. Contact an authorized Clarke American
Sanders dealer.
Low voltage from poor connection. Contact an authorized Clarke American
Sanders dealer
Defective motor. Contact an authorized Clarke American
Sanders dealer.
No power. Check power supply and connections.
Motor runs sluggishly. Low voltage from excessive footage, Locate power source nearer to work site.
undersized extension cord, or poor Decrease sanding pressure.
connection.
Defective run capacitor. Contact an authorized Clarke American
Sanders dealer.
Defective motor. Contact an authorized Clarke American
Sanders dealer.
Motor starter trips/repeatedly Excessive load. Contact an authorized Clarke American
Sanders dealer.
Defective electronic start switch. Contact an authorized Clarke American
Sanders dealer.
Defective motor starter. Contact an authorized Clarke American
Sanders dealer.
Low voltage from poor connection. Contact an authorized Clarke American
Sanders dealer.
Defective motor Contact an authorized Clarke American
Sanders dealer.
Defective capacitor. Contact an authorized Clarke American
Sanders dealer.
Uneven cut. Leveling out of adjustment. Readjust leveling.
Burning or glazing. Dull abrasive. Replace abrasive.
Excessive sanding pressure. Decrease sanding pressure setting.
Too fine of an abrasive. Use coarser abrasive.
Slow cutting. Dull abrasive. Replace abrasive.
Too fine of an abrasive. Use a coarser abrasive.
Insufficient sanding pressure. Increase sanding pressure setting.
Waves on sanded surface. Debris on wheel. Remove and clean wheels.
Flat spot on tire(s). Replace tires.
Chatter marks on sanded Drum out of round. Contact an authorized Clarke American
Surface (close evenly spaced) Sanders dealer or replace the drum.
Drum vibration. Change shim combination. Remove debris
from surface or ends of drum.
PROBLEM CAUSE ACTION
Troubleshooting

Page 18 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
NOTES

Clarke®American Sanders - American 12 Floor Sander Operator's Manual FORM NO. 78150D Page 19
American
12
Section II
Parts and Service Manual
(78150D)

Page 20 FORM NO. 78150D Clarke®American Sanders - American 12 Floor Sander Owner's Manual
Model American 12 Floor Sander
Drawing #1 Handle Assembly 5/06
46
1
2
345
678
9
10
12
15
11
13
18
12
15
10
20
19
31
33
21
30
29
28
34
32
35
34
31
39
40
38
37
42
32
41
36
43
44
45
17
16
23
25
26
27
24 21
22
47 7
8
9
48 49
50
For model #07120A only.