I have a case 650k recently the transmission communication warn light comes on and it will not move. Kind of like the right side track stops. I put it in neutral for a second go to reverse and then forward then works fine fit a bit. I have checked the speed sensors, relays, and fuses. I even swapped out the joy stickwith my 650L dozer and it did the same thing. After doing that it will no go at all forwards or reverse. Fault codes it brings up are 4533, 4131 and today it brought up 4212.
Ok the error code 4533 is joystick CAN message fault, 4131 is right forward solenoid circuit open, 4212 left motor solenoid open circuit.