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TROUBLESHOOTING & REPAIR
F-10 F-10
Classic III and IIID
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
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.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The engine will NOT go to high
speed when either a welding load
or an auxiliary load is connected to
the Classic III. The machine has
normal output and engine speed
when the Idler switch is in the
“High” position.
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. The Idler PC board may be
faulty. Replace.
The engine will not shut down. 1. Make sure the ignition switch
is turned off and operating cor-
rectly.
1. The Classic III gasoline model
ignition switch supplies 12VDC
to both the ignition coil and the
fuel shut-off solenoid. Check
that these circuits are operating
correctly. See the Wiring
Diagram. When the ignition
switch is in the “off” position,
there should NOT be 12VDC
applied to the ignition coil nor
the fuel shut-off solenoid.
2. The Classic IIID diesel model
ignition switch supplies 12VDC
to the pump solenoid and the
fuel lift pump. Check that these
circuits are operating correctly.
See the Wiring Diagram. When
the ignition switch is in the “off”
position, there should NOT be
12 VDC applied to the pump
solenoid nor the fuel lift pump.