液压油缸是液压系统中的主要工作部件 ,ZG型柱塞式液压油缸在联合收割机上应用得较多 ,如割台升降油缸、拨禾轮升降油缸等。油封是油缸中的易损件 ,一旦损坏就会导致油缸漏油 ,无法正常工作。更换油封必须先把柱塞从缸体中抽出来 ,而抽出柱塞这一环节常常是机手进行维修的难点 Hydraulic cylinder hydraulic system is the main working parts, ZG-piston hydraulic cylinder in the combine harvester more applied, such as header lifting cylinder, reel lifting cylinder. The oil seal is a consumable part in the cylinder. Once it is damaged, it will lead to oil leakage in the cylinder and will not work normally. Replacement of the oil seal must first be removed from the cylinder block, and the extraction of the piston is often the link in the hands of the maintenance difficulties