Lincoln Electric SHIELD-ARC SVM128-A Service Manual page 64

F-10
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The engine will NOT go to high
speed when either a welding load
or an auxiliary load is connected to
the SA-250.
The machine has normal output
and engine speed when the Idler
Control switch is in the "High" posi-
tion.
The engine will not shut down.
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
216-383-2531 or 1-800-833-9353.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
1. Check the welding cables and
auxiliary load leads for loose or
faulty connections.
2. Check for mechanical restric-
tions or missing parts in the idler
and throttle linkage (springs,
etc.).
1. Make sure the ignition switch
is turned off and operating cor-
rectly.
CAUTION
SA-250
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. The idler PC board may be
faulty. Replace.
1. Check the fuel injection pump
for proper operation.
12VDC is applied to the pump at
leads #59C (+) to #60(-), the
fuel pump should be working.
When the 12VDC is removed,
the pump should stop pumping
fuel to the engine.
F-10
When