Lincoln Electric SVM194-A Purging Air from Fuel System Perkins, Engine, Idler Maintenance

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D1.3		MAINTENANCE			D1.3
Replace brushes when they wear within 1/4” of the pig-			Purging Air from Fuel System		(Perkins
tail. A complete set of replacement brushes should be			104-22 Engine)
kept on hand. Lincoln brushes have a curved face to				WARNING
fit the commutator. Have an experienced maintenance
man seat these brushes by lightly stoning the commu-
tator as the armature rotates at full speed until contact			Keep fuel clear of open flames or arcs, allow
is made across the full face of the brushes. After ston-			engine to cool before working on the fuel system.
ing, blow out the dust with low pressure air.			Wipe up any spilled fuel and do not start engine
To seat slip ring brushes, position the brushes in place.			until fumes clear.
Then slide one end of a piece of fine sandpaper			------------------------------------------------------------------------
between slip rings and brushes with the coarse side			If the engine is running rough and you suspect air has
against the brushes. With slight additional finger pres-			been trapped in the fuel system, (e.g. the engine was
sure on top of the brushes, pull the sandpaper around			allowed to run out of fuel) perform the following steps
the circumference of the rings - in direction of rotation			using qualified personnel:
only - until brushes seat properly. In addition, stone slip			1. Loosen by two or three turns, the vent screw
ring with a fine stone. Brushes must be seated 100%.
Arcing or excessive exciter brush wear indicates a pos-			(Figure D1.3) on the fuel inlet connection.
sible misaligned shaft. Have an authorized Field
Service Shop check and realign the shaft.
Idler Maintenance				Vent Screw
	CAUTION
Before doing electrical work on the idler printed			Priming
circuit board, disconnect the battery.			Lever
------------------------------------------------------------------------				FIGURE D1.3
When installing a new battery or using a jumper battery
to start the engine, be sure the battery polarity is con-			2. For Engines Equipped with a mechanical fuel pump:
nected properly. The correct polarity is negative			Operate the priming lever on the fuel lift pump until
ground. Damage to the engine alternator and the print-			fuel, free of air, flows from the vent point. Tighten
ed circuit board can result from incorrect connection.			the vent screw. If the pump is at the point of maxi-
1. The solenoid plunger must work freely and not bind.			mum lift, it will not be possible to operate the prim-
			ing lever. If this occurs, turn the crankshaft one
	Dust the plunger about once a year with graphite		revolution.
2.	powder.		For Engines Equipped with an electric fuel pump:
	Proper operation of the idler requires good ground-		Operate the electric fuel pump by turning the
	ing of the printed circuit board, reed switch, and bat-		“Ignition” switch “ON” until fuel, free of air, flows
	tery.		from the vent point. Tighten the vent screw.
3.	Idler solenoid is activated for high idle.		3. Contact your Perkins Engine repair facility if prob-
			lems persist.
4. If desired, the welder can be used without automat-
	ic idling by setting the “Idler” switch to the “High”
	position.
Nameplates

Whenever routine maintenance is performed on this machine - or at least yearly - inspect all nameplates and labels for legibility. Replace those which are no longer clear. Refer to the parts list for the replacement item number.

CLASSIC® 300D & 300G