Troubleshooting - Lincoln Electric 11198 Operator's Manual

SAE-400™
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Machine fails to hold the "heat"
constantly.
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.
POSSIBLE
CAUSE
FUNCTION PROBLEMS
1. Rough or dirty commutator.
2. Brushes may be worn down to
limit of life.
3. Brush springs may be broken.
4. Field circuit may have variable
resistance connections or intermit-
tent open circuit, due to loose con-
nections or broken wire.
5. Electrode or work lead connec-
tions may be poor.
6. Wrong grade of brushes may be
installed on generator.
7. Field rheostat may be making
poor contact and overheating.
8. "Current Control" may not be
operating properly.
9. "Current Control" brushholder con-
tact springs may be worn out or
missing. Contact surface may be
dirty, rough and pitted.
10. "Current Control" brushholder
support stud and mating contact
surfaces may be dirty or pitted
and burned.
11. Engine running at varying
speeds.
CAUTION
E-2
TROUBLE SHOOTING
RECOMMENDED
COURSE OF ACTION
1. True and clean commutator.
2. Replace brushes.
3. Replace brush springs.
4. Check field current with ammeter
to discover varying current. This
applies to both the main generator
and exciter.
5. Tighten all connections.
6. Use only the recommended
Lincoln brushes.
7. Inspect and clean rheostat.
8. Check for loose or missing set
screw in control handles.
9. Inspect. Replace needed parts.
Clean internal contact surface of
control device. Do not lubricate.
Smooth rough surfaces.
10. If brushholder internal contact
surface is pitted and burned,
replace the brushholder and sup-
port stud. If the contact surface is
dirty, clean off the brushholder
stud and internal contact surface.
Apply mixture of three parts sili-
cone grease and one part zinc
powder (by weight) to stud.
11. Set welder controls for maximum
output and weld. Then, while
welding, check engine rpm. The
engine should be running at full
speed. If indicator shows a sig-
nificant difference, consult your
engine manual.