Section 7: Service; Troubleshooting - Grizzly G0763 Owner's Manual

SECTION 7: SERVICE

Review the troubleshooting and procedures in this section if a problem develops with your machine. If
you need replacement parts or additional help with a procedure, call our Technical Support. Note: Please
gather the serial number and manufacture date of your machine before calling.
Symptom Possible Cause
Motor will not start. 1. Power supply switched OFF or has
incorrect voltage.
2. Blown fuse/tripped circuit breaker at main
panel.
3. Break or short in wiring; or loose
connections.
4. ON/OFF switch at fault.
5. Motor connection wired incorrectly.
6. Motor at fault.
Machine has 1. Motor fan rubbing on fan cover.
excessive vibration
or noise.
2. Motor is loose.
3. Grinding wheel out of balance.
4. Motor bearings worn or damaged.
Machine stalls 1. Motor is being overloaded.
or slows when
2. Motor at fault.
operating.
Handwheel binds or 1. Ways/ball bearing strips need lubrication.
is difficult to move.
2. Gears/rack and pinion are worn.
Vibration when 1. Grinding wheel is out-of-round, loaded up
grinding, poor
with material, or damaged.
surface finish,
2. Missing or torn grinding wheel paper
or incorrect final
washers.
dimensions.
3. Incorrect grinding wheel hardness or grit
rating.
4. Improperly installed magnetic chuck.
5. Workpiece is loose.
6. Loose machine component.
7. Ways/ball bearing strips need lubrication.
8. Grinding wheel has varying densities, or is
of poor quality.
9. Coolant is incorrect or incorrectly mixed.
10. Motor or motor bearings at fault.
Power feed unit will 1. Power feed unit fuse is blown.
not start.
-38-

Troubleshooting

Possible Solution
1. Switch power supply ON or verify voltage.
2. Correct the cause of overload, then reset/replace
fuse or breaker.
3. Trace/replace broken or corroded wires; fix loose
connections.
4. Replace switch.
5. Wire motor correctly (Page 43).
6. Test for shorted windings, bad bearings, and repair
or replace.
1. Fix/replace fan cover; replace loose or damaged
fan.
2. Tighten any loose fasteners.
3. Inspect, ring test, balance, and dress grinding
wheel.
4. Replace motor bearings or replace motor.
1. Reduce depth of cut.
2. Test for shorted windings, bad bearings, and repair
or replace.
1. Relubricate ways/ball bearing strips (Page 35).
2. Replace gears/rack and pinion.
1. Inspect, ring test, dress, and balance grinding
wheel.
2. Remove and replace paper washers, then inspect,
ring test, balance, and dress grinding wheel.
3. Match wheel grade and grit rating with workpiece
hardness.
4. Stone table and chuck surfaces, and remove all
burrs and foreign material from mating surfaces,
and reinstall the chuck.
5. Replace or repair chuck for poor holding power.
6. Inspect all machine connections, and tighten any
loose fasteners.
7. Relubricate ways/ball bearing strips (Page 35).
8. Replace grinding wheel with acceptable brand.
9. Refer to coolant manufacturer's workpiece verses
coolant type recommendations and correct coolant.
10. Replace motor or replace bearings.
1. Replace fuse.
Model G0763 (Mfd. Since 6/15)