Lincoln Electric SVM194-A service manual Weld output is considerably

CLASSIC® 300D & 300G

Perform the Engine RPM

Adjustment Test.

Check the exciter brushes and, if necessary, perform the

Exciter Brush and Slip Ring Service Procedure.

Check the welding generator brushes and, if necessary, perform the Welding

Generator Brush and Commutator Inspection and Service procedure.

Check all the large weld current carrying leads inside the machine for damaged conductors, insulation, and poor connections.

Check the wiring that connects the exciter, field bridge rectifier, rheostat, remote/local switch, and the shunt coils. Check for damaged conductors, insulation, and poor connections.

Replace the Exciter Diode Bridge with a new or known good bridge.

(Diode bridges will sometimes appear good under test, but fail while under a normal operating load.)

Check the 64 Ohm fine current control rheostat, replace if necessary.

Check remote/local switch. Replace if necessary. Perform the Exciter Rotor

Resistance and Ground Test.

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F-7	TROUBLESHOOTING AND REPAIR			F-7
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
The weld output is considerably		OUTPUT PROBLEMS
		Check welding cables for
less than indicated on the dials		damaged or poor connections.
or varies abnormally. Auxiliary		Welding cable may be
output appears normal.		excessively long, too small, or
		coiled. Try using a set of
		short test cables of adequate
		size.
		If a remote current control is
		being used, try switching to
		local control. The remote
		current control may be faulty.
		The engine may not be
		maintaining steady RPM.
		Make sure there is an
		adequate supply of clean,
		fresh fuel. Replace fuel filters
		if necessary. Have engine
		serviced by a qualified engine
		technician.

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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.