Product Description 6127-31-2140 6127-31-2030 picture: CONTACT WITH US: Komatsu S6D155,S6D155-4 piston 6127-31-2140, piston kit 6127-31-2030 USED FOR Dozer: D150A-1: 5508-Up; eng S6D155-4A sn 10014-Up D155A-1: 5508-Up; eng S6D155-4B sn 10016-Up Dozer: D155A-2: 50001-Up; eng S6D155-4S sn 52707-Up ...