Quantcast ENGINE LOSES HIGH IDLE AFTER START UP

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TROUBLESHOOTING
TESTING AND ADJUSTING
5b. ENGINE LOSES HIGH IDLE AFTER START UP
Cause:
Correction:
Normal RPM Loss
Loss of approximately 20 rpm can be expected from average cold
start to operating temperature.
A shift of 6 to 8 rpm can be expected on the UG8D. A continuous
steady speed loss suggests a slipping motor clutch. Adjust motor
clutch to 0.51 to 0.62 Nm (4.5 to 5.5 lb. in.).
High Idle Adjustment Incorrect
Make sure governor and engine fuel settings are correct. Make
an adjustment of the high idle as needed.
6. ENGINE CANNOT BE SHUT DOWN THROUGH GOVERNOR.
Cause:
Correction:
Bad Shut Down Solenoid
Solenoid with a fault, shorted or broken wires, or stuck in open
position. Inspect and replace as needed.
Wires Not Connected Correctly
Shut down signal not connected with correct polarity to solenoid A
positive (+), B negative (-) to 2 pin connector.
Hydraulic/ Pneumatic Shutoff Signal Too Low
The signal must be 172 to 276 kPa (25 to 40 psi). The bellows
may also be damaged. Measure signal pressures, inspect parts
and make repairs or replacements as needed.
Governor Not Correctly Installed
Make sure control lever on governor terminal shaft is engaged
correctly with the stop lever of the engine fuel control linkage.
Governor Needs Repair
Disassemble, clean and inspect governor for worn and damaged
parts. Make a replacement of parts as needed.
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