Spare parts of hydraulic piston pumps Model:HA10VSO/HA11VLO/HA4VSO/HA6VSO/HA/ Spare parts of hydraulic piston pumps: 1. The material of piston shoes from Germany ,as same as Rexroth ,the material of cylider from UK.Compare with other suppilers ,we produce spare parts by special nitriding treatment technology ,and it never break the protective film of piston hole ,so make it hard .