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Shutdown Solenoid
LEFT SIDE
Idler Solenoid
Adjusting Collar
Locking Nut
Adjusting Screw
Locking Nut
FIGURE F.7 – HIGH AND LOW IDLE ADJUSTMENTS - CUMMINS ENGINE ONLY
ENGINE THROTTLE ADJUSTMENT TEST PROCEDURE (CONTINUED)
PROCEDURE
Frequency Counter Method
1. Plug the frequency counter into one of the 115 VAC
auxiliary receptacles.
2. Start the engine and check the frequency counter.
At HIGH IDLE (1900 RPM), the counter should
read 63 Hz. At LOW IDLE (1475 RPM), the
counter should read 49 Hz. Note that these are
median measurements; hertz readings may vary
slightly above or below.
3. If either of the readings is incorrect, adjust the
throttle as follows:
Adjust HIGH IDLE: Use the 10mm wrench to
loosen the locking nut. See Figure F.7 for location
of the adjusting screw and locking nut. Turn the
threaded screw counter-clockwise to increase the
HIGH IDLE speed. Adjust the speed until the fre-
quency reads 63 Hz. Retighten the locking nut.
Adjust LOW IDLE: First make sure there is no load
on the machine. Set the IDLE switch to AUTO and
wait for the engine to change to low idle speed.
Use the 10mm wrench to loosen the solenoid lever
arm locking nut. See Figure F.7. Adjust the collar,
to change the amount of throw in the lever arm,
until the frequency reads 49 Hz. Retighten the
locking nut.
TROUBLESHOOTING AND REPAIR
F-27 F-27
VANTAGE® 500
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