E-4

 

TROUBLESHOOTING

 

E-4

 

 

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PROBLEMS

POSSIBLE

RECOMMENDED

 

 

 

 

 

(SYMPTOMS)

 

 

CAUSE

 

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WELDING PROBLEMS

 

 

 

 

 

 

 

 

Arc is unstable – Poor starting

 

 

1. Check for correct input voltage

 

 

 

 

 

 

 

 

 

 

 

 

to machine – 115vac.

 

 

 

 

 

 

 

 

 

 

 

2.

Check for proper electrode

 

 

 

 

 

 

 

 

 

 

 

 

polarity for process.

 

 

 

 

 

 

 

 

 

 

 

3.

Check gun tip for wear or dam-

 

 

 

 

 

 

 

 

 

 

 

 

age and proper size – Replace.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If all recommended possible areas

 

 

 

 

 

 

 

4.

Check for proper gas and flow

 

 

of misadjustment have been

 

 

 

 

 

 

 

 

rate for process. (For MIG only.)

 

 

checked and the problem persists,

 

 

 

 

 

 

 

 

 

 

 

Contact your local

Lincoln

 

 

 

 

 

 

 

5.

Check work cable for loose or

 

 

Authorized Field

Service

 

 

 

 

 

 

 

 

faulty connections.

 

 

Facility.

 

 

 

 

 

 

 

 

6.

Check gun for damage or

 

 

 

 

 

 

 

 

 

 

 

 

breaks.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7.

Check for proper drive roll orien-

 

 

 

 

 

 

 

 

 

 

 

 

tation and alignment.

 

 

 

 

 

 

 

 

 

 

 

8.

Check liner for proper size.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.

Pro-MIG 140

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Lincoln Electric Pro-MIG 140 manual Contact your local Lincoln, Authorized Field Service, Facility