Grizzly G0763 owner manual Service, Troubleshooting, Symptom Possible Cause Possible Solution

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 at (570) 546-9663. Note: Please gather the serial number and manufacture date of your machine before calling.

Troubleshooting

Symptom	Possible Cause		Possible Solution
Motor will not start.	1.	Power supply switched OFF or has	1.	Switch power supply ON or verify voltage.
		incorrect voltage.
	2.	Blown fuse/tripped circuit breaker at main	2.	Correct the cause of overload, then reset/replace
		panel.		fuse or breaker.
	3.	Break or short in wiring; or loose	3.	Trace/replace broken or corroded wires; fix loose
		connections.		connections.
	4.	ON/OFF switch at fault.	4.	Replace switch.
	5.	Motor connection wired incorrectly.	5.	Wire motor correctly (Page 44).
	6.	Motor at fault.	6.	Test for shorted windings, bad bearings, and repair
				or replace.
Machine has	1.	Motor fan rubbing on fan cover.	1.	Fix/replace fan cover; replace loose or damaged
excessive vibration				fan.
or noise.	2.	Motor is loose.	2.	Tighten any loose fasteners.
	3.	Grinding wheel out of balance.	3.	Inspect, ring test, balance, and dress grinding
				wheel.
	4.	Motor bearings worn or damaged.	4.	Replace motor bearings or replace motor.
Machine stalls	1.	Motor is being overloaded.	1.	Reduce depth of cut.
or slows when	2.	Motor at fault.	2.	Test for shorted windings, bad bearings, and repair
operating.				or replace.
Handwheel binds or	1.	Ways/ball bearing strips need lubrication.	1.	Relubricate ways/ball bearing strips (Page 36).
is difficult to move.	2.	Gears/rack and pinion are worn.	2.	Replace gears/rack and pinion.
Vibration when	1.	Grinding wheel is out-of-round, loaded up	1.	Inspect, ring test, dress, and balance grinding
grinding, poor		with material, or damaged.		wheel.
surface finish,	2.	Missing or torn grinding wheel paper	2.	Remove and replace paper washers, then inspect,
or incorrect final
		washers.		ring test, balance, and dress grinding wheel.
dimensions.
	3.	Incorrect grinding wheel hardness or grit	3.	Match wheel grade and grit rating with workpiece
		rating.		hardness.
	4.	Improperly installed magnetic chuck.	4.	Stone table and chuck surfaces, and remove all
				burrs and foreign material from mating surfaces,
				and reinstall the chuck.
	5.	Workpiece is loose.	5.	Replace or repair chuck for poor holding power.
	6.	Loose machine component.	6.	Inspect all machine connections, and tighten any
				loose fasteners.
	7.	Ways/ball bearing strips need lubrication.	7.	Relubricate ways/ball bearing strips (Page 36).
	8.	Grinding wheel has varying densities, or is	8.	Replace grinding wheel with acceptable brand.
		of poor quality.
	9.	Coolant is incorrect or incorrectly mixed.	9.	Refer to coolant manufacturer's workpiece verses
				coolant type recommendations and correct coolant.
	10. Motor or motor bearings at fault.		10. Replace motor or replace bearings.
Power feed unit will	1.	Power feed unit fuse is blown.	1.	Replace fuse.
not start.
-38-				Model G0763 (Mfg. Since 8/13)