Grizzly G0646, G0647 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.	Main Power switch turned off.	1.	Rotate Main Power switch to ON or 1.
start or	a breaker	2.	Emergency Stop push-button is engaged/	2.	Rotate clockwise slightly until it pops out/replace it.
trips.			faulty.
		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 56).
		5.	Wall fuse/circuit breaker is blown/tripped.	5.	Ensure circuit size is suitable for this machine;
					replace weak breaker.
		6.	Thermal overload relay has tripped.	6.	Turn cut-out dial to increase working amps and push
					the reset pin. Replace if tripped multiple times (weak
					relay).
		7.	Contactor not getting energized/has burnt	7.	Test for power on all legs and contactor operation.
			contacts.		Replace unit if faulty.
		8.	Power supply switched OFF or is at fault.	8.	Ensure power supply is switched on; ensure power
					supply has the correct voltage.
		9.	Wiring is open/has high resistance.	9.	Check for broken wires or disconnected/corroded
					connections, and repair/replace as necessary.
		10. Motor Start button or Main Power switch is		10. Replace faulty Start button or Main Power switch.
			at fault.
		11. Motor is at fault.		11. Test/repair/replace.
Machine stalls or is		1.	Wrong workpiece material.	1.	Use only metal with a hardness of 45 kg/mm2 or less
overloaded.					and is within capacities of machine.
		2.	Motor connection is wired incorrectly.	2.	Correct motor wiring connections (Page 56).
		3.	Plug/receptacle is at fault.	3.	Test for good contacts; correct the wiring.
		4.	Motor bearings are at fault.	4.	Test by rotating shaft; rotational grinding/loose shaft
					requires bearing replacement.
		5.	Machine is undersized for the task.	5.	Use sharp tooling; keep workpiece within the capaci-
					ties of machine; use cutting lubricant.
		6.	Motor has overheated.	6.	Clean off motor, let cool, and reduce workload.
		7.	Contactor not getting energized or has poor	7.	Test for power on all legs and contactor operation.
			contacts.		Replace if faulty.
		8.	Motor is at fault.	8.	Test/repair/replace.
		9.	Hydraulic fluid low in reservoir.	9.	Fill hydraulic reservoir (Page 40).
		10. Hydraulic fluid pressure too low; hydraulic		10. Test/adjust for correct hydraulic fluid pressure (Page
			pump at fault.		50), replace pump if necessary.
		11. Hydraulic system has leaks or valves at		11. Check/repair/replace hydraulic hoses, connections,
			fault.		and valves.
G0646/G0647 50/65 Ton Ironworker					-43-