Lincoln Electric SVM168-B service manual Figure F.7

F-31 TROUBLESHOOTING & REPAIR F-31

TOC	TOC	ENGINE THROTTLE ADJUSTMENT TEST (continued)
Section	Master
		FIGURE F.7		FIGURE F.8
		HIGH IDLE ADJUSTMENT NUT	LOW IDLE ADJUSTMENT NUT
to	to
Return	Return		Solenoid	3/8" Low Idle
		Housing		Adjustment	Muffler
				Nut
		Throttle
		linkage
		Choke
		Cable
TOC	TOC				Rod
Return to Section	Return to Master	3/8" High Idle
		Adjustment Nut

		11. If either of the readings is incorrect, adjust				2.	Start the engine and check the frequency
		the throttle as follows:					counter.	At HIGH IDLE (3700 RPM), the
		Adjust HIGH IDLE: Use the 3/8” wrench to					counter should read 60.8 to 62.5 Hz. At
							LOW IDLE (2200		RPM),	the counter
		turn the spring-loaded adjustment nut.
							should read 35.8 to 37.5 Hz. Note that
		See Figure F.8 for location of the adjust-
							these are	median	measurements; hertz
TOC	TOC	ment nut. Turn	the nut	clockwise	to
							readings may vary slightly above or below.
		increase HIGH IDLE speed.		Adjust	the
Section	Master	speed until the tach reads between 3650				3.	If either of the readings is incorrect, adjust
		and 3750 RPM.					the throttle as follows:
to	to	Adjust LOW IDLE: First make sure there is					Adjust HIGH IDLE: Use the 3/8” wrench to
		no load on the machine.		Set the IDLE			turn the spring-loaded adjustment nut.
Return	Return
		switch to AUTO and wait for the engine to					See Figure F.7 for location of the adjust-
		change to low idle speed.		Use the 3/8”			ment nut.	Turn the nut clockwise to in-
		wrench to adjust the solenoid nut, which					crease HIGH IDLE speed.			Adjust the
		changes the amount of throw in the throttle					speed until the frequency reads between
		lever arm. See Figure F.8 for location of the					60.8 and 62.5 Hz.
		adjustment nut.	Adjust the nut until the				Adjust LOW IDLE: First make sure there is
		tach reads between 2150 and 2250 RPM.
							no load on the machine. Set the IDLER
		Frequency Counter Method					switch to AUTO and wait for the engine to
		1. Plug the frequency counter into one of the					change to low idle speed. Use the 3/8”
							wrench to adjust the solenoid nut, which
TOC	TOC	115 VAC auxiliary receptacles.
							changes the amount of throw in the throttle
SectiontoReturn	MastertoReturn						lever arm. See Figure F.8 for location of the
							adjustment nut. Adjust the nut until the fre-
							quency reads between 35.8 and 375.Hz.

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