Lincoln Electric 300FM, 400FM manual Troubleshooting, Function Problems

E-2		TROUBLESHOOTING		E-2
	Observe all Safety Guidelines detailed througout this manual
	PROBLEMS	POSSIBLE CAUSE	RECOMMENDED
	(SYMPTOMS)		COURSE OF ACTION
		FUNCTION PROBLEMS
1. Drive rolls turn, but wire will not		A. Gun cable kinked and/or twisted.	A. Keep as straight as possible.
feed or wire feeding is rough.			Inspect cable and replace if nec-
			essary.
		B. Wire jammed in gun and cable.	B. Remove wire from gun and cable
			– feed in new wire. Note any
			obstruction. Replace liner if nec-
			essary.
		C.Incorrect drive rolls and guide	C.Be sure the wire diameter being
		tubes.	used is stamped on drive rolls
			and guide tubes. Replace if nec-
			essary.
		D.Gun cable liner dirty.	D.Clean liner or replace.
		E. Worn drive rolls.	E. Replace or reverse split drive roll
			type.
		F. Electrode rusty and/or dirty.	F. Replace the electrode if it is
			rusty.
		G.Worn or improper size cable	G.Replace cable liner.
		liner.
		H.Partially flashed, melted, or	H.Replace the contact tip.
		improper size contact tip.
2. Variable or “hunting” arc.		A. Contact tip worn or incorrect	A. Replace contact tip.
		size.
		B. Worn or undersize ground cables	B. Inspect – repair or replace as
		or poor ground connections.	necessary.
		C.Loose electrode connections.	C.Be sure the following connec-
			tions are tight: electrode cable to
			wire feeder and power source,
			work cable to power source and
			work, gun cable to wire feeder
			contact block, gun nozzle to
			body, and contact tip to nozzle.

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.

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