Mechanical Troubleshooting - Planer/Jointer; Replacement Parts - Jet JPJ-12B Operating Instructions And Parts Manual

14.3 Mechanical Troubleshooting – Planer/Jointer
Trouble Probable Cause
Chain Inadequate
jumping. tension.
Sprockets
misaligned.
Sprockets worn.
Machine will No incoming
not start/ power.
restart or
Overload
repeatedly
automatic reset
trips circuit
has not reset.
breaker or
Planer frequently
blows fuses.
trips.
Building circuit
breaker trips or
fuse blows.
Loose electrical
connections.
Motor starter
failure.
Switch or Motor
failure – how to
distinguish.
Motor failure.
Miswiring of the
unit.

15.0 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 Stock Number and Serial
Number of your machine available when you call will allow us to serve you quickly and accurately.
Non-proprietary parts, such as fasteners, can be found at local hardware stores, or may be ordered from
JET. Some parts are shown for reference only, and may not be available individually.
Remedy
Adjust chain tension.
Align sprockets.
Replace sprockets.
Verify unit is connected to power, on-button is pushed in
completely, and stop-button is disengaged.
When planer overloads on the circuit breaker built into the motor
starter, it takes time for the machine to cool down before restart.
Allow unit to adequately cool before attempting restart.
One cause of overloading trips, which are not electrical in nature,
is too heavy a cut. The solution is to take a lighter cut. If too deep
a cut is not the problem, then check the amp setting on the
overload relay. Match the full load amps on the motor as noted on
the motor plate. If the amp setting is correct, there is probably a
loose electrical lead. Check amp setting on motor starter.
Verify that planer is on a circuit of correct size. If circuit size is
correct, there is probably a loose electrical lead. Check amp
setting on motor starter.
Go through all the electrical on the planer including motor
connections, verifying the tightness of each. Look for any signs of
electrical arcing which is a sure indicator of loose connections or
circuit overload.
Examine motor starter for burned or failed components. If
damage is found, replace motor starter. If motor starter looks
okay but is still suspect, you have two options: have a qualified
electrician test the motor starter for function, or purchase a new
starter and establish if that was the problem on changeout.
If you have access to a voltmeter, you can separate a starter
failure from a motor failure by first, verifying incoming voltage at
220±20 and second, checking the voltage between starter and
motor at 220±20. If incoming voltage is incorrect, you have a
power supply problem. If voltage between starter and motor is
incorrect, you have a starter problem. If voltage between starter
and motor is correct, you have a motor problem.
If electric motor is suspect, you have two options: Have a
qualified electrician test the motor for function or remove the
motor and take it to a quality electric motor repair shop and have
it tested.
Double check to confirm all electrical connections are correct and
properly tight. The electrical connections other than the motor are
pre-assembled and tested at the factory. Therefore, the motor
connections should be double checked as the highest probability
for error. If problems persist, double-check the factory wiring.
Table 3
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