保护系统油路
protective system oil line
闭合油路回油道
loop circuit return passage
闭路油缸控制回路
loop cylinder control circuit
closed loop cylinder control circuit
变速箱润滑油路安全阀体
transmission lubrication relief valve body
变速箱润滑油路测压接头
transmission lubrication pressure tap
差动转向润滑油路
differential steer lubrication circuit
铲刀升降液压油路
blade lift hydraulic circuit
超龄油路
overage bitumen pavement
overage bitumen road
overaged bitumen pavement
超龄油路养护
overage bitumen pavement maintenance