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19
10.2 Mechanical and electrical problems
Symptom Possible Cause Correction *
Motor will not start. Low voltage. Check power line for proper voltage.
Open circuit in motor or loose
connection.
Inspect all lead connections on motor for
loose or open connections.
Overload condition. Allow machine to cool down, then re-start.
Motor will not start, or
motor stalls, resulting
in blown fuse or tripped
breaker.
Too many tools running on one
circuit.
Reduce number of tools connected to
circuit.
Motor brushes worn. Inspect and replace brushes if needed.
Short circuit in line cord or plug. Inspect cord or plug for damaged insulation
and shorted wires.
Short circuit in motor or loose
connections.
Inspect all connections on motor for loose
or shorted terminals or worn insulation.
Incorrect fuses or circuit breakers in
power line.
Install correct fuses or circuit breakers.
Motor overheats. Motor overloaded. Reduce load on motor: Increase speed or
decrease feed pressure. Make sure blade
is appropriate for material.
Air circulation through motor is
restricted.
Clean motor fan with vacuum to restore
normal air circulation.
Gear misalignment. Take unit to authorized JET service center.
Gear case bearings are worn. Take unit to authorized JET service center
for bearing replacement.
Machine slows when
operating.
Excessive feed pressure. Adjust spring tension to reduce feed
pressure, or increase speed.
Motor brushes worn. Inspect and replace brushes if needed.
Table 4
* WARNING: Some corrections may require a qualified electrician.
11.0 Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-800-
274-6848 Monday through Friday, 8:00 a.m. to 5:00 p.m. CST. Having the Model Number and Serial Number of
your machine available when you call will allow us to serve you quickly and accurately.
Some parts are shown for reference only, and may not be available individually.
Non-proprietary parts, such as fasteners, can usually be found at local hardware stores or may be ordered from
JET.
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