Grizzly G0756 owner manual Service, Troubleshooting, Motor & Electrical

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

Motor & Electrical

Symptom		Possible Cause		Possible Solution
Machine	does not	1.	emergency stop push-button engaged/at	1.	Rotate button to reset/replace it.
start or	a breaker		fault.
trips		2.	Chuck guard open/safety switch at fault.	2.	Close guard/replace switch.
		3.	spindle position limit switch engaged/at	3.	Adjust spindle position to disengage limit switch;
			fault.		replace switch.
		4.	Power supply switched OFF or at fault.	4.	Ensure power supply is on/has correct voltage.
		5.	Plug/receptacle at fault/wired wrong.	5.	Test for good contacts; correct the wiring.
		6.	Motor connection wired wrong.	6.	Correct motor wiring connections (Page 41).
		7.	Wall circuit breaker tripped.	7.	Ensure circuit size is correct/replace weak breaker.
		8.	Wiring open/has high resistance.	8.	Check/fix broken, disconnected, or corroded wires.
		9.	Master power switch at fault.	9.	Replace switch.
		10. Motor or motor components at fault.		10. Test/repair/replace.
Machine stalls or is		1.	Feed rate/cutting speed too fast.	1.	Decrease feed rate/cutting speed.
overloaded.		2.	Wrong tooling.	2.	Use the correct tool for the task.
		3.	Machine is undersized or tooling is incorrect	3.	Use smaller or sharper tool; reduce feed rate or
			for the task.		spindle speed; use coolant if possible.
		4.	Motor connection is wired incorrectly.	4.	Correct motor wiring connections (Page 41).
		5.	Motor bearings are at fault.	5.	Test by rotating shaft; rotational grinding/loose shaft
					requires bearing replacement.
		6.	Motor has overheated.	6.	Clean off motor, let cool, and reduce workload.
		7.	Motor or motor components at fault.	7.	Test/repair/replace motor.
Machine has		1.	Excessive depth of cut.	1.	Decrease depth of cut.
vibration or noisy		2.	Tooling is loose or improperly installed.	2.	Make sure tooling is properly secured.
operation.		3.	Machine is incorrectly anchored or sits	3.	Tighten/replace anchors; relocate/shim machine.
			unevenly.
		4.	Motor or machine component is loose.	4.	Inspect/replace stripped or damaged bolts/nuts, and
					re-tighten with thread locking fluid.
		5.	Tooling is dull or at fault.	5.	Replace/resharpen tooling.
		6.	Bit is chattering.	6.	Replace/sharpen bit; index bit to workpiece; use
					appropriate feed rate and cutting RPM.
		7.	Motor fan is rubbing on fan cover.	7.	Replace dented fan cover or damaged fan.
		8.	Motor bearings are at fault.	8.	Test by rotating shaft; rotational grinding/loose shaft
					requires bearing replacement.

Model G0756 (Mfg. Since 2/13) -35-