Decelerator (STD cab) Position potentiometer voltage is too high
Reverse clutch is not calibrated
Aux 3rd Raise Coil solenoid shorted to 12 volts.
Low pressure switch (-) input shorted to ground
Reverse clutch is not calibrated
If Steering Not Working,Hydraulic suction filter plugged.Improper tire inflation.Steering linkage needs lubrication.Excessive play in steering. See your John Deere Dealer.