Lincoln Electric SVM194-A service manual Kubota powered Classic, 300D

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F-20	TROUBLESHOOTING AND REPAIR				F-20
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS			POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)			MISADJUSTMENT(S)	COURSE OF ACTION
The engine goes to low idle, but		N/A	FUNCTION PROBLEMS	For Classic® 300G and
will not stay at low idle.	The			Kubota powered Classic®
machine has normal weld and				300D:
auxiliary output. The engine				Check all wiring connecting
starts and shuts down normally.				the current sensor and the
(Continued)				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
		N/A		through the sensor.
The engine will not go to high				The Idle switch may be
idle when the idle switch is				defective.
moved to the “High” position.				Wiring connecting the idle
The idle system functions
normally while welding or using				switch may be faulty.
auxiliary power. The engine				See Wiring Diagram.
starts and shuts down normally.
The engine will not go to high		Check that the welding cables		The idle/engine protection PC
idle when striking an arc or		and the auxiliary power lead		board may have failed.
when using auxiliary power.		connections are tight and in		The current sensor PC board
The engine goes to high idle,		good condition.
and the weld and auxiliary				may have failed.
power are normal when the idle
switch is in the “High Idle”
position. The engine starts,
runs, and shuts down normally.

CAUTION

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.

CLASSIC® 300D & 300G