Support, Pivot Shaft Front. PART NO: A-M4156T. Front Axle/Steering Parts > Axles and Knees John Deere TRACTOR: MT John Deere TRACTOR: 40 (ROW CROP) John Deere TRACTOR: 420 (ROW CROP) John Deere TRACTOR: 430 (ROW CROP). . MODELS: John Deere TRACTOR: MT John Deere TRACTOR: 40 (ROW CROP) John Deere TRACTOR: 420 (ROW CROP) John Deere TRACTOR: 430 (ROW CROP).