PARKED IN THE WINTER OF LAST YEAR, NEVER DROVE AGAIN, WHEELS STEER LIKE THEY SHOULD, MACHINE IS ON SOMEWHAT LEVEL GROUND, REPLACED TILT/LEVEL MODULE, REPLACED BOTH DRIVE MOTORS, OHMED OUT CONTACTORS, HYDRAULIC BRAKES ARE DISENGAGING. CHARGED AND TESTED BATTERIES, MACHING WILL FREEWHEEL WHEN LIFTED WHEN COMMANDED TO DRIVE, IT BUDGES FORWARD AN INCH AND BOUNCES BACK, THROWING AN ERROR "VEHICLE SPEED NOT DETECTED" I HAVE NO CLUE!!
First, I'd raise the unit off the ground (up on blocks). Then do the verification tests.