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FUNCTION PROBLEMS
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
CAUTION
The engine goes to low idle, but
will not stay at low idle. The
machine has normal weld and
auxiliary output. The engine
starts and shuts down normally.
Make sure there are no
external loads on the weld
terminals or the auxiliary
power receptacles. Disconnect
the weld cables and unplug
anything that may be
connected to the auxiliary
receptacles.
The low idle RPM may be too
low. Perform the engine idle
adjustment procedure.
The idle solenoid linkage may
be out of adjustment. Check
that the linkage moves freely
and that the plunger is not
binding in any way. Check
that the solenoid can freely
pull in and solidly seat
against its internal stop.
The idle solenoid may have
failed. Disconnect the
solenoid leads and check the
resistance of the solenoid
coil. See machine schematic
for correct solenoid
resistance. Check the
solenoid for a grounded coil;
the resistance between
chassis ground and either
solenoid lead wire should be
500k Ohms (500,000 Ohms)
minimum.
There may be a poor or
intermittent connection in the
solenoid wiring, or a
component may be opening
while under load. Check the
idle switch and the wiring
between the switch, the
solenoid, and the PC Board.
Repair or replace any poor
connections, damaged wiring,
or faulty components. (See
wiring diagram)
The idle/engine protection PC
board may be faulty.
TROUBLESHOOTING AND REPAIR
F-19 F-19
CLASSIC® 300D & 300G
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