Lincoln Electric COMMANDER 400 SVM133-B Service Manual page 63

F-9
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
The machine goes to low idle but
does not stay at low idle.
The engine will not crank or cranks
very slowly.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-
800-833-9353 (WELD).
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
ENGINE PROBLEMS
1. Make sure there is NOT an
external load (auxiliary or weld)
connected to the Commander
400.
1. Check for loose, faulty, or cor-
roded battery cable connections.
2. Check the leads and connec-
tions at the starter solenoid and
the start push button.
3. The battery may be faulty.
CAUTION
Commander 400
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. The idler solenoid linkage may
be misadjusted or damaged.
2. The idler solenoid hold-in circuit-
ry may be faulty. Check leads
#237 and #226 for loose or faulty
connections.
Diagram.
3. Perform the Idler Solenoid Test.
4. Make sure the control board
mounting/grounding screws are
tight.
5. Check solenoid waveforms as
illustrated in the Oscilloscope
Waveforms Section.
6. The control board may be faulty.
Replace.
1. The starter motor, solenoid or
push button may be faulty.
Check or replace.
2. The engine may be hard to
crank due to a mechanical fail-
ure in the engine.
F-9
See the Wiring