Grizzly g0748, g0747 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
Machine does not	1.	plug/receptacle at fault or wired incorrectly.	1.	test for good contacts; correct the wiring.
start or a breaker	2.	power supply is switched OFF or at fault.	2.	ensure hot lines have correct voltage on all legs
trips.				and main power supply is switched ON.
	3.	Motor connections wired incorrectly.	3.	Correct motor wiring connections (Pages 57 & 58).
	4.	spindle switch at fault.	4.	replace faulty spindle switch.
	5.	Motor windings or motor at fault.	5.	replace motor.
Machine stalls or is	1.	Machine undersized for task.	1.	use smaller, sharp tools; reduce feed rate; reduce
overloaded.				spindle speed; use coolant.
	2.	Workpiece not securely clamped to table or	2.	Make sure workpiece is properly clamped to table or
		mill vise.		mill vise; use work holding jig if necessary.
	3.	dull, damaged or incorrect cutting tool.	3.	use sharp and correct cutting tool for operation.
	4.	spindle speed is incorrect for operation.	4.	select appropriate spindle speed (Page 33 or 35).
	5.	Motor connections wired incorrectly.	5.	Correct motor wiring connections (Pages 57 & 58).
	6.	plug/receptacle at fault or wired incorrectly;	6.	test for good contacts; correct wring problems;
		incorrect voltage from power supply.		ensure hot lines have correct voltage on all legs.
	7.	pulley loose.	7.	re-align/replace shaft, pulley, set screw, or key as
				required.
	8.	Motor bearings at fault.	8.	test by rotating shaft; rotation grinding/loose shaft
				requires bearing replacement.
	9.	Motor overheated.	9.	let motor cool, clean off, and reduce workload.
	10. Motor at fault.		10. replace motor.
Machine has	1.	tool holder or cutter at fault.	1.	replace out-of-round tool holder; replace/re-
vibration or noisy				sharpen cutter; use appropriate feed rate and
operation.				spindle speed.
	2.	Workpiece alignment poor.	2.	eliminate workpiece bindings; use vise or clamps as
				required for proper workpiece alignment control.
	3.	spindle and spindle clutch are not properly	3.	Make sure the spindle and spindle clutch are
		meshed.		properly meshed.
	4.	Motor or component loose.	4.	inspect/replace stripped or damaged bolts/nuts, and
				re-tighten with thread-locking fluid.
	5.	pulley loose.	5.	re-align/replace shaft, pulley, set screw, or key as
				required.
	6.	Machine incorrectly mounted to floor or sits	6.	re-tighten/replace mounting bolts in floor; relocate/
		unevenly.		shim machine.
	7.	Motor bearings at fault.	7.	test by rotating shaft; rotation grinding/loose shaft
				requires bearing replacement.
	8.	gearbox at fault.	8.	rebuild gearbox and replace worn/damaged gears
				and bearings.
Model G0747/G0748 (Mfg. Since 8/12)				-49-