Lincoln Electric SVM194-A service manual Maintenance, D4.2

CLASSIC® 300D & 300G

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D4.2				MAINTENANCE			D4.2
SAFETY PRECAUTIONS						4. Follow the engine service schedule in this manual
						and the detailed maintenance and troubleshooting in
			WARNING			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					sure radiator. Keep the radiator cap tight to prevent
	maintenance. Remove guards only when neces-					loss of coolant. Clean and flush the cooling system
	sary and replace them when the maintenance					periodically to prevent clogging the passage and over-
	requiring their removal is complete. Always use					heating the engine. When antifreeze is needed, always
	the greatest care when working near moving					use the permanent type.
	parts.					BEARINGS
	Do not put your hands near the engine cooling
	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					bearing having sufficient grease to last indefinitely
	the nearest Lincoln Field Service Shop.					under normal service. Where the welder is used con-
-----------------------------------------------------------------------						stantly or in excessively dirty locations, it may be nec-
			ELECTRIC SHOCK can kill.			essary to add one half ounce of grease per year. A pad
			• Do not touch electrically live parts or			of grease one inch wide, one inch long, and one inch
			electrode with skin or wet clothing.			high weighs approximately one	half ounce. Over-
			• Insulate yourself from	work and		greasing is far worse than insufficient greasing.
			ground			When greasing the bearings, keep all dirt out of the
			• Always wear dry insulating gloves.
------------------------------------------------------------------------						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.			Use care so your hands, hair, clothing or tools do
			• Keep away from moving parts.			not catch in the rotating parts. Protect yourself
------------------------------------------------------------------------						from particles that may be thrown out by the rotat-
See additional warning information at						ing armature when stoning the	commutator.
	front of this operatorʼs manual.					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
						brushes by removing the covers. DO NOT remove or
		least once every two months. In particularly dirty				replace these covers while the machine is running.
		locations, this cleaning may be necessary once a				Commutators and slip rings require little attention.
		week. Use low pressure air to avoid driving dirt into				However, if they are black or appear uneven, have
		the insulation.				them cleaned by an experienced maintenance man
2. “Current Range Selector” contacts should not be						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.