Decelerator or Hand Throttle (STD cab) Position potentiometer voltage is too low
High range clutch is not calibrated
Aux 3rd Lower solenoid failed open or short circuit.
Low pressure switch (-) input shorted to power
Foot Throttle Position potentiometer voltage is too low (engine controller pin B30)
High range clutch is not calibrated
One sign to move on is intensive Keck-Gonnerman engine work, such as needing new pistons and injectors. If you hear loud clunking sounds from the engine, it could be due to the starter hitting the flywheel or a piston piercing the engine block, which can indicate a seized engine. Farmers encountering these problems have coined the saying: If your engine is knockin you better be shoppin.