Lincoln Electric SVM194-A service manual Machine will not idle down

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.

Return to Section TOC Return to Master TOC

Return to Section TOC Return to Master TOC

Return to Section TOC Return to Master TOC

F-17	TROUBLESHOOTING AND REPAIR			F-17
Observe Safety Guidelines detailed in the beginning of this manual.
	PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
The machine will not idle down		FUNCTION PROBLEMS
		Make sure the idle switch is in
to low RPM when weld and		the “AUTO IDLE” position.
auxiliary loads are removed.		Make sure there is no external
The machine has normal weld
and auxiliary output. The engine		load on the weld terminals or
starts and shuts down normally.		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.

Return to Section TOC Return to Master TOC

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