Lincoln Electric SVM175-A service manual Engine Throttle Adjustment Test, Strobe-Tach Method

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F-30	TROUBLESHOOTING & REPAIR	F-30
	ENGINE THROTTLE ADJUSTMENT TEST (continued)
	FIGURE F.5 – STROBE MARK LOCATION
	ENGINE SPEED
	CONTROL LEVER
	FAN HUB
	STROBE
	TACH
	MARK

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TEST PROCEDURE

Strobe-Tach Method

1. Turn the engine off

2. open the top and right side engine service access doors.

3. Place a highly visible mark on the engine cooling fan hub. See Figure F.5.

4. Connect the strobe-tach according to the manufacturerʼs instructions.

5. Start the engine and place the idle switch in the “HIGH IDLE” position. Make sure that there is no load on the machine.

6.Direct the strobe-tach light on the fan hub that had been marked earlier, and synchro- nize the light with the rotating mark. See the strobe-tach manufacturer instructions.

The tach should read between 3625 and 3675 RPM.

7.Move the idle switch to the “AUTO IDLE” position and wait for the idle solenoid to energize, and the engine RPM to drop and stabilize at the low idle RPM.

8.Synchronize the strobe-tach to read the low idle RPM.

If either of the readings is incorrect, proceed to the “THROTTLE ADJUSTMENT PROCE- DURE” later in this section.

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RANGER 305D