14
12.0
Troubleshooting the JWBG-8
Table 3
Problem Probable
Cause
Remedy
Motor will not start.
Not plugged into receptacle.
Plug must be fully inserted into receptacle.
Switch not in
ON
position.
Make sure switch is moved completely to ON
position.
Motor cord cut or abraded.
Replace with new cord.
Plug on cord is faulty.
Replace with new plug.
Fuse blown or circuit breaker tripped.
Re-set. (There may be too many machines
on circuit.)
Motor faulty.
Contact JET Customer Service.
Motor will not start
and fuse blows or
circuit breaker trips.
Too many machines running on
same electrical circuit.
Turn off other machines and try again.
Incorrect fuse.
Try time delay fuse, or go to circuit with
higher rated fuse or circuit breaker.
Wheels cannot rotate because of
obstruction.
Unplug and turn grinding wheel by hand;
clear any obstructions.
Undersized extension cord.
Use correct size extension cord; see Table 1.
Short circuit.
Cord, plug, or motor needs repair; contact
JET Customer Service.
Motor fails to develop
full power.
Low line voltage.
Have an electrician check power line for
proper voltage.
Faulty motor or capacitor.
Contact JET Customer Service.
Motor overheats.
Overload on motor.
Reduce load on motor; do not press so hard.
Capacitor failure.
Call JET Customer Service.
Motor stalls or slows.
Motor overload.
Reduce load on motor; do not press so hard.
Low line voltage.
Check power line for proper voltage.
Loose wire connections.
Contact JET Customer Service.
Faulty motor.
Contact JET Customer Service.
Frequent fuse or
circuit breaker failure.
Motor overload.
Reduce load on motor; do not press so hard.
Overload of electrical circuit.
Too many electrical appliances on same
circuit.
Incorrect fuse or circuit breaker.
Have electrician upgrade service to outlet.
Grinding wheels won’t
spin true.
Arbor nut too tight, springing the
flanges.
Do not overtighten nut.
Flange(s) warped, or flange surface
is not flat.
Replace flange(s).
Wheel bushings have too much play.
Install new bushings or replace wheel.
Arbor damaged.
Contact JET Customer Service.
Excessive vibration.
Incorrect size or type of wheel.
Match wheel size to grinder specifications.
Use proper wheel type for job being done.
Wheels out of balance.
Balance wheels. See section 6.13
Too much play in wheel bushing.
Install new bushings or replace wheel.
Flanges are worn, bent or have burrs. Inspect flanges, replace if needed.
Worn bearings in grinder.
Replace bearings. Contact JET Customer
Service.
Poor quality wheel.
Replace wheel with one of better quality.
