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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 machine will not idle down
to low RPM when weld and
auxiliary loads are removed.
The machine has normal weld
and auxiliary output. The engine
starts and shuts down normally.
(Continued)
If the machine idles down
after the sensor is unplugged,
check the wiring between the
PC board and toroidal current
sensor for damaged insulation
and electrical contact with
other electrically live
components. (See the wiring
diagram) If the wiring is
good, there is likely a load on
the auxiliary circuit. Check all
wiring and components in the
AC auxiliary circuit. (See
wiring diagram)
If the machine still will not
idle down, check all wiring
connected to the solenoid.
See the wiring diagram. Look
for damaged wiring, poor
connections, dirty or corroded
terminals, etc. If all of the
wiring is good, replace the PC
board.
For Classic® 300G and
Kubota powered units:
Unplug the current sensor PC
board.
If the machine will not idle
down, check all the wiring
connecting to the current
sensor.
If all the wiring is good,
replace the engine control
unit.
If the engine idles down when
the sensor is disconnected,
reconnect the sensor, then
disconnect the leads that loop
through the current sensor
sensing unit. (See wiring
diagram)
If the engine does not idle
down, replace the current
sensor PC board.
TROUBLESHOOTING AND REPAIR
F-18 F-18
CLASSIC® 300D & 300G
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