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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.
Make sure the idle switch is in
the “AUTO IDLE” position.
Make sure there is no external
load on the weld terminals or
the auxiliary power
receptacles. Disconnect the
weld cables and unplug
anything that may be
connected to the auxiliary
receptacles.
For machines equipped with
an idle solenoid, check for
mechanical restrictions in the
idler solenoid linkage.
Check the Idle Switch for
proper operation. See wiring
diagram.
Perkins powered units:
The idle solenoid linkage, if
so equipped, may be bent or
out of adjustment. Check that
the linkage moves freely and
that the plunger does not bind
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 coil
resistance. Check the
resistance from the solenoid
leads to the solenoid body,
resistance should be very
high, 500,000 (500k) ohms
minimum.
Perform the Engine RPM
Adjustment Test.
The 2-CR Reed relay may be
faulty. The reed relay should
be electrically open if no
current is flowing in the weld
circuit. If there is continuity
through the reed relay when
the machine is off, it is
defective and should be
replaced.
There may be voltage in the
toroidal current sensor circuit.
Unplug the current sensor
from the PC board. See
wiring diagram.
TROUBLESHOOTING AND REPAIR
F-17 F-17
CLASSIC® 300D & 300G
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