AR51194 Injection Line Fits John Deere Tractors 4000 4020 4520 600One New Aftermarket Replacement Injection Line Fits John Deere Industrial Construction: 600 (ENG SN: 215000 > ) Fits John Deere Tractors: 4000 (engine s n 280001 later, w Power Shift or Syncro), 4020 (s n 201000 later, engine s n 280001 later, w Power Shift or Syncro), 4520 (engine s n 245535 303518) Replaces Part Numbers: AR51194