Lincoln Electric SAE-300 MP K4089-2, Operator'S Manual

Page: 25 / 36

E-2
TROUBLE SHOOTING
SAE-300 ® MP
Observe all Safety Guidelines detailed throughout this manual
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.
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Machine fails to hold the output
(heat) consistently.
1. Rough or dirty commutator.
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. “Current Control” Reactor
(coarse current) bore may
require cleaning.
7. “Current Control” may not be
operating properly.
8. “Current Control” brush holder
contact springs may be worn out
or missing. Contact surface may
be dirty, rough and pitted.
9. “Current Control” brush holder
support stud and mating contact
surfaces may be dirty or pitted
and burned.
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Lincoln Authorized
Field Service Facility.
7. Check for loose or missing set
screw in control handles.
8. Inspect. Replace needed parts.
Clean internal contact surface of
control device. Do not lubricate.
Smooth rough surfaces.
9. If brush holder internal contact
surface is pitted and burned,
replace the brush holder and
support stud. If the contact sur-
face is dirty, clean off the brush
holder stud and internal contact
surface. Apply mixture of three
parts silicone grease and one
part zinc powder (by weight) to
stud.
CAUTION