Lincoln Electric SVM150-A service manual Engine Throttle Adjustment Test, Strobe-Tach Method

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F-20 F-20

TROUBLESHOOTING & REPAIR

ENGINE THROTTLE ADJUSTMENT TEST (continued)

FIGURE F.4 – STROBE MARK LOCATION

MARK BLOWER

PADDLE

TEST PROCEDURE

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1.Turn the engine off.

2.Perform the Case Cover Removal proce- dure.

Strobe-Tach Method

1.With a white or red marking pencil, place a mark on one of the blower paddles. See Figure F.4 for location.

2.Connect the strobe-tach according to the manufacturer's instructions.

3.Start the engine and direct the strobe-tach light on the blower paddle. Synchronize it to the rotating mark.

With the machine at HIGH IDLE the tach should read between 3700 and 3750 RPM.

With the machine at LOW IDLE the tach should read between 2350 and 2450 RPM.

4.If either of the readings is incorrect, adjust the throttle as follows:

Adjust HIGH IDLE: Use the 3/8" wrench to loosen the spring-loaded adjustment nut. See Figure F.5 for location of the adjustment nut. Turn the nut clockwise to increase the HIGH IDLE speed. Adjust the speed until the tach reads between 3700 and 3750 RPM.

Adjust LOW IDLE: First make sure there is no load on the machine. Set the IDLER switch to AUTO and wait for the engine to change to low idle speed. Use the 7/16" wrench to adjust the solenoid nut, which changes the amount of throw in the throttle lever arm. See Figure F.6 for the location of the adjustment nut. Adjust the nut until the tach reads between 2350 and 2450 RPM.

RANGER 250