Sears 113.19771 - Manual (Page 33)

MOTOR TROUBLE - SHOOTING CHART
NOTE: Motors used on wood working tools are particularly
susceptible to the accumulation of sawdust and wood chips
and
should be blown out or "vacuumed" frequently to
prevent interference with norma! motor ventilation.
TROUBLE PROBABLE CAUSE SUGGESTED REMEDY
Motor will not run. 1. Protector open; circuit
broken.
1. Reset protector by pushing on red button,
located on top of motor (indicated by
audible click).
2. Low voltage. 2. Check power line for proper voltage.
Motor will not run and
fuses "BLOW".
1. Short circuit in line,
cord or plug.
1. Inspect line, cord and plug for damaged
insulation and shorted wires.
2. Short circuit in motor or
loose connections.
2. Inspect all terminals in motor for loose or
shorted terminals or worn Insulation on wires.
3. Incorrect fuses in power line. 3. 1 nstall correct fuses.
Motor fails to develop
full power. (Power output
of motor decreases rapidly
with decrease in voltage at
motor terminals. For
example: a reduction of
10% in voltage causes a
reduction of 19% in
maximum power output
of which the motor is
capable, while a reduction
of 20% in voltage causes
a reduction of 36% in
maximum power output.)
1. Power line overloaded with
lights, appliances and other
motors.
2. Undersize wires or circuit
too long.
3. General overloading of
power company's facilities.
(In many sections of the
country, demand for
electrical power exceeds
the capacity of existing
generating and distribution
systems.)
1. Reduce the line load.
2. Increase wire sizes, or reduce length of wiring.
3. Request a voltage check from the power company.
Motor overheats. 1. Excessive feed rate when
crosscutting or ripping.
1. Slow down rate of feed.
2. Improper cooling. (Air
circulation restricted
through motor due to
sawdust, etc.)
2. Clean out sawdust to provide normal air
circulation through motor.
3. Saw blade has "heel". 3. Refer to Alignment Procedure Section of
manual Step Five.
Motor starts slowly or
fails to come up to full
speed.
1. Low Voltage will not trip
starting switch.
1. Correct low voltage condition.
Motor stalls (resulting in
blown fuses or tripped
circuit breakers). 1. Voltage too low to permit
motor to reach operating
speed.
1 Correct the low 1 ine voltage condition.
2. Fuses or circuit breakers
do not have sufficient
capacity.
2. Replace fuses or circuit breakers with
proper capacity units.
Frequent opening of
fuses or circuit breakers.
1. Motor overloaded.
2. Fuses or circuit breakers
do not have sufficient
capacity.
1. Reduce motor load.
2. Replace fuses or circuit breakers.
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