Grizzly G9979 owner manual Service, Troubleshooting, Motor & Electrical

troubleshooting

SECTION 7: SERVICE

Review the troubleshooting and procedures in this section to fix or adjust your machine if a problem devel- ops. If you need replacement parts or you are unsure of your repair skills, then feel free to call our Technical Support at (570) 546-9663.

Troubleshooting

Motor & Electrical

Symptom		Possible Cause		Possible Solution
Machine	does not	1.	Power switch key is removed or not in ON	1.	Install power switch key and turn it to the ON posi-
start or	a breaker		position (Model G8146Z only).		tion.
trips.		2.	Emergency stop push-button is engaged/	2.	Rotate clockwise until it pops out; replace it if faulty.
			faulty (Model G8146Z only).
		3.	Plug/receptacle is at fault or wired incor-	3.	Test for good contacts; correct the wiring.
			rectly.
		4.	Motor connection wired incorrectly.	4.	Correct motor wiring connections (Page 51).
		5.	Wall fuse/circuit breaker is blown/tripped.	5.	Ensure circuit size is suitable for this machine;
					replace weak breaker.
		6.	Power supply switched OFF or is at fault.	6.	Ensure power supply is switched on; ensure power
					supply has the correct voltage.
		7.	Wiring is open/has high resistance.	7.	Check for broken wires or disconnected/corroded
					connections, and repair/replace as necessary.
		8.	Start/Stop switch is at fault (Model G8144Z/	8.	Replace Start/Stop switch.
			G8145Z).
		9.	Inverter is at fault.	9.	Replace inverter.
		10. Motor is at fault.		10. Test/repair/replace.
Machine stalls or is		1.	Feeding workpiece too fast.	1.	Reduce feed rate; increase blade speed.
overloaded.		2.	Workpiece alignment is poor.	2.	Eliminate workpiece binding; use jig, fence, guide,
					clamps, roller table, or push blocks as required for
					workpiece alignment control.
		3.	Wrong workpiece material or blade.	3.	Use metal with correct properties for your type of
					machining; match blade with workpiece and opera-
					tion.
		4.	Blade is slipping on wheels.	4.	Adjust blade tracking and tension (Page 29), redress
					rubber wheel tires if necessary (Page 37).
		5.	Motor connection is wired incorrectly.	5.	Correct motor wiring connections (Page 51).
		6.	V-belt(s) slipping.	6.	Replace bad V-belt(s) as a matched set, align pul-
					leys, and re-tension (Page 41).
		7.	Plug/receptacle is at fault.	7.	Test for good contacts; correct the wiring.
		8.	Pulley/sprocket slipping on shaft.	8.	Replace loose pulley/shaft.
		9.	Motor bearings are at fault.	9.	Test by rotating shaft; rotational grinding/loose shaft
					requires bearing replacement.
		10. Machine is undersized for the task.		10. Use sharp blade with lower TPI; reduce the feed
					rate; use a small amount of oil-based coolant if nec-
					essary.
		11. Motor has overheated.		11. Clean off motor, let cool, and reduce workload.
		12. Motor is at fault.		12. Test/repair/replace.

G8144Z/G8145Z/G8146Z	-39-
(Manufactured Since 6/11)