液压油泵控制柱塞
hydraulic pump control piston
液压油泵壳排油口
hydraulic pump case drain
液压油泵的构造
hydraulic pump construction
液压油泵补偿器阀
hydraulic pump compensator valve
先导液压油回路
hydraulic pilot oil circuit
系统液压油滤清器
system hydraulic oil filter
系统机具液压油滤清器
system implement fluid filter
无渍液压油
Non-staining Hydraulic Oil
拖拉机液压油箱加注口盖
tractor hydraulic tank filler cap
提升器油缸液压油密封性试验
lift cylinder oil leakage test