Jet JPJ-12B, Operating Instructions And Parts Manual

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14.3 Mechanical Troubleshooting
– Planer/Jointer
Trouble Probable Cause Remedy
Chain
jumping. Inadequate
tension. Adjust chain tension.
Sprockets
misaligned. Align sprockets.
Sprockets worn. Replace sprockets.
Machine will
not start/
restart or
repeatedly
trips circuit
breaker or
blows fuses. No incoming
power. Verify unit is connected to power, on-button is pushed in
completely, and stop-button is disengaged.
Overload
automatic reset
has not reset. 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.
Planer frequently
trips. 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.
Building circuit
breaker trips or
fuse blows. 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.
Loose electrical
connections. 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.
Motor starter
failure. 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.
Switch or Motor
failure
– how to
distinguish.
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.
Motor failure. 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.
Miswiring of the
unit. 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
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.