Lincoln Electric SVM194-A service manual Safety Precautions, Information at

CLASSIC® 300D & 300G

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D2.2					MAINTENANCE			D2.2
SAFETY PRECAUTIONS							4. Follow the engine service schedule in this manual
			WARNING				and the detailed maintenance and troubleshooting
							in the engine manufacturerʼs manual.
	Have qualified personnel do the maintenanc					e	COOLING SYSTEM
	work. Turn the engine off before working inside
	the machine. In some cases, it may be necessary						The Classic® 300D Perkins is equipped with a pres-
	to remove safety guards to perform required
	maintenance. Remove guards only when neces-						sure radiator. Keep the radiator cap tight to prevent
	sary and replace them when the maintenance						loss of coolant. Clean and flush the cooling system
	requiring their removal is complete. Always use						periodically to prevent clogging the passage and over-
	the greatest care when working near moving						heating the engine. When antifreeze is needed, always
	parts.						use the permanent type.
	Do not put your hands near the engine cooling						BEARINGS
	blower fan. If a problem cannot be corrected by						This welder is equipped with a double-shielded ball
	following the instructions, take the machine to
	the nearest Lincoln Field Service Shop.						bearing having sufficient grease to last indefinitely
-----------------------------------------------------------------------							under normal service. Where the welder is used con-
			ELECTRIC SHOCK can kill.				stantly or in excessively dirty locations, it may be nec-
			• Do not touch electrically live parts or				essary to add one half ounce of grease per year. A pad
			electrode with skin or wet clothing.				of grease one inch wide, one inch long, and one inch
			• Insulate yourself	from work and			high weighs approximately one	half ounce. Over-
			ground				greasing is far worse than insufficient greasing.
			• Always wear dry insulating gloves.				When greasing the bearings, keep all dirt out of the
------------------------------------------------------------------------							area. Wipe the fittings completely clean and use clean
			ENGINE EXHAUST can kill.				equipment. More bearing failures are caused by dirt
			• Use in open, well ventilated areas or				introduced during greasing than from insufficient
			vent exhaust outside.				grease.
			------------------------------------------------------------------------				COMMUTATOR AND BRUSHES
			MOVING PARTS can injure.				WARNING
			• Do not operate with doors open or
			guards off.				Uncovered rotating equipment can be dangerous.
			• Stop engine before servicing.
			• Keep away from moving parts.				Use care so your hands, hair, clothing or tools do
See------------------------------------------------------------------------additional warning				information at			not catch in the rotating parts. Protect yourself
							from particles that may be thrown out by the rotat-
	front of this operatorʼs manual.						ing armature when stoning the	commutator.
							------------------------------------------------------------------------
-----------------------------------------------------------							Shifting of the commutator brushes may result in:
							- Change in machine output
GENERAL INSTRUCTIONS							- Commutator damage
							- Excessive brush wear
1. Blow out the welder and controls with an air hose at							Periodically inspect the commutator, slip rings, and
		least once every two months. In particularly dirty					brushes by removing the covers. DO NOT remove or
		locations, this cleaning may be necessary once a					replace these covers while the machine is running.
		week. Use low pressure air to avoid driving dirt into					Commutators and slip rings require little attention.
		the insulation.					However, if they are black or appear uneven, have
2. “Current Range Selector” contacts should not be							them cleaned by an experienced maintenance man
							using fine sandpaper or a commutator stone. Never
		greased. To keep the contacts clean, rotate the cur-					use emery cloth or paper for this purpose.
		rent control through its entire range frequently. Good
		practice is to turn the handle from maximum to min-

imum setting twice each morning before starting to weld.

3.Put a drop of oil on the “Current Range Selector” shaft at least once every month.