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Motor
NOTE: Motors used on wood working tools are particularly susceptible to the accumulation of sawdust and wood chips
and shouId be blown out or "Vacuumed" frequently to prevent interference with normal motor ventilation
Trouble Probable Cause
FExcessive Noise 1 Motor
Motor fails to develop
full power NOTE: Low
Voltage:
(Power output of motor
decreases rapidly with
decrease in voltage at
motor terminals For
example, a reduction of
110% in voltage causes
'.a reduction of 19% in
maximum power output
of which the motor is
capable, and a reduc-
tion of 20% in voltage
causes a reduction of
36% in maximum power
output.)
Motor starts slowly or
fails to come up to full
speed
Motor overheats
Relay will not operate
Motor stalls (resulting in
blown fuses or tripped
circuit breakers)
Frequent opening of
fuses or circuit breakers
t Circuit overloaded with lights,
appliances and other motors
2 Undersize wires or circuit too
long
3. General overloading of power 3
company facilities r(in some
sections of the country,
demand for electrical power
may exceed the capacity of
existing generating and distribu-
tion systems )
4 Incorrect fuses of circuit break-
era in power line
1. Low voltage 1.
2 Windings burned out or open 2
3 Starting relay not operating 3
1 Motor overloaded 1
2 Improper cooling (Air circulation 2
restricted through motor due to
sawdust, accumulating inside
of saw )
1. Burned contacts (due to 1,
extended hold-in periods
caused by low line voltage, etc.,)
2. Saw not in upright position 2.
3. Loose or broken connectors. 3
1. Starting relay not operating, 1
2 Voltage too low to permit motor 2.
to reach operating speed
3 Fuses or circuit breakers do not i3
have sufficient capacity.
1. Motol overloaded j l
2 Fuses or circuit breakers do not 2
have sufficient capacity
3. Starting relay not operating _3
(motor does not reach speed.)
Remedy
1 Have motor checked by qualified service technician
Repair service is available at your nearest Sears
store.
1 Do not use other appliances or motors on same cir-
cuit when using the saw
2. Increase wire sizes, or reduce length of wiring. See
"Motor Specifications and electrical Requirements"
section
Request a voitage check from the power company
4. Install correct fuses or circuit breakers
Request voltage check from the power company
Have motor repaired or replaced.
Have relay reptaced
Feed work slower into blade
Clean out sawdust to provide normal air circulation
through motor See "Maintenance" and "Lubrication"
section
Have relay replaced and request a voltage check
from the power company
Place saw in upright position.
Have wiring checked and repaired.
Have relay replaced
Request voltage check from the power company
Install proper size fuses or circuit breakers.
Feed work slower into blade
Install proper size fuses or circuit breakers
Have relay replaced.
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