Lincoln Electric IM843-C manual Contact your local Lincoln, Authorized Field Service Facility

E-2	TROUBLESHOOTING	E-2
	Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

Machine fails to hold the output	1.	Rough or dirty commutator.
(heat) consistently.	2.	Brushes may be worn down to
		Limit.
	3.	Field circuit may have variable
		resistance connection or inter-
		mittent open circuit due to
		loose connection or broken
		wire.
	4.	Electrode lead or work lead
		connection may be poor.
	5.	Wrong grade of brushes may
		have been installed on gener-
		ator.
	6.	Field rheostat may be making
		poor contact and overheating.
Welder starts but fails to generate	1.	Generator or exciter brushes
current.		may be loose or missing.
	2.	Exciter may not be operating.	If all recommended possible areas
	3.	Field circuit of generator or
			of misadjustment have been
		exciter may be open	checked and the problem persists,
	4.	Exciter may have lost excita-	Contact your local Lincoln
		tion.	Authorized Field Service Facility.
	5.	Series field and armature cir-
		cuit may be open-circuited.
Welding arc is loud and spatters	1.	Current setting may be too
excessively.		high.
	2. Polarity may be wrong.
Welding current too great or too	1.	Exciter output low causing low
small compared to indication on		output compared to dial indica-
the dial.		tion.
	2. Operating speed too low or too
		high.
Arc continuously pops out.	1.	“Current Range Selector”
		switch may be set at an inter-
		mediate position.

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.

CLASSIC 300D KUBOTA