Lincoln Electric IM847-D manual Installed

E-3	TROUBLESHOOTING	E-3
	Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

POSSIBLE AREAS OF MISADJUSTMENTS(S)

RECOMMENDED

COURSE OF ACTION

Variable or "hunting" arc.	1. Check for proper size contact.
		Make sure the contact tip is not
		worn, free of spatter and not melt-
		ed.
	2.	Clean and tighten all electrode
		and work connections.
	3.	Verify the proper polarity is being
		used for the weld procedure.
	4.	Make sure the proper electrode
		stick-out is being maintained.
	5.	Check the gas flow rate and mix-
		ture.
	6.	Verify the gun bushing is tightly to
		the wire drive.
	7.	Verify the gun is tightly mounted
		to the gun bushing.

The motor thermal LED illuminates. 1. Check for sharp bends in the gun liner.

2.Examine the contact tip for wear and proper size. Replace as nec- essary.

3.Check the gun liner. The welding If all recommended possible areas of electrode should slide easily misadjustment have been checked

through the gun. and the problem persists, Contact

4.Verify the proper gun liner is your local Lincoln Authorized

installed. Field Service Facility.

5.Reduce the pressure arm setting.

6.On bench models, make sure the brake tension is not too tight.

7.If using a wire conduit, verify the wire slides easily through the conduit.

When the gun trigger is pulled, the	1.	Check all electrode and work
drive rolls spin but no arc is present.		connections.
	2.	Verify the gun bushing is tightly to
		the wire drive.
	3.	Verify the gun is tightly mounted
		to the gun bushing.
	4.	Check the control cable and con-
		nectors for cuts. Verify that no
		pins are broken or bent.
The arc burns back to the tip at the	1.	If the timer kit is installed, reduce
end of the weld.		the amount of burnback time.
The gas continues to flow for a long	1.	If the timer kit is installed, reduce
time at the end of a weld.		the amount of postflow time.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

LF-72