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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.
(Continued)
For Classic® 300G and
Kubota powered Classic®
300D:
Check all wiring connecting
the current sensor and the
engine control unit.
Unplug the current sensor.
If the machine still will not
stay at low idle, replace the
engine control unit.
If the machine goes to and
maintains low idle RPM,
reconnect the sensor and
disconnect the wires passing
through the sensing coil.
If the problem persists,
replace the current sensor PC
board. If the problem is
unchanged, check for current
flowing in the LEDS that pass
through the sensor.
The engine will not go to high
idle when the idle switch is
moved to the “High” position.
The idle system functions
normally while welding or using
auxiliary power. The engine
starts and shuts down normally.
The Idle switch may be
defective.
Wiring connecting the idle
switch may be faulty.
See Wiring Diagram.
The engine will not go to high
idle when striking an arc or
when using auxiliary power.
The engine goes to high idle,
and the weld and auxiliary
power are normal when the idle
switch is in the “High Idle”
position. The engine starts,
runs, and shuts down normally.
The idle/engine protection PC
board may have failed.
The current sensor PC board
may have failed.
Check that the welding cables
and the auxiliary power lead
connections are tight and in
good condition.
TROUBLESHOOTING AND REPAIR
F-20 F-20
CLASSIC® 300D & 300G
N/A
N/A
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