Lincoln Electric SVM194-A service manual RPM Adjustment Test, Slip Ring Service, Procedure

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F-9	TROUBLESHOOTING AND REPAIR			F-9
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
		WELDING PROBLEMS	The engine RPM may be
The welding arc is loud and		The weld current or voltage
spatters excessively.		settings may be incorrect.	incorrect; perform the Engine
		The polarity may be incorrect	RPM Adjustment Test.
		for the process in use.	Check the exciter brushes
		If a remote current control is	and slip rings, and if
			necessary, perform the Brush
		being used, try switching to	and Slip Ring Service
		local control. The remote	Procedure.
		current control may be faulty.	Check the DC welding
			generator brushes and
			commutator. Perform the
			Welding Generator Brush
			and Commutator Inspection
			and Service Procedure.
			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.)
			Perform the	Exciter Rotor
			Resistance and Ground
			Test.	Shunt Field Coil
			Perform the
			Resistance and Ground
			Test.
			Verify that the rocker is
			positioned correctly, according
			to the factory drill mark.
			Adjust the rocker position per
			the procedure in this manual.

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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.

CLASSIC® 300D & 300G