Olfactory diagnosis method: smell whether the hydraulic oil has peculiar smell with your nose. If you smell the burnt smell of the hydraulic oil, it means that the hydraulic components such as the hydraulic pump are heated locally, resulting in the scorched and smoking of the hydraulic oil. Therefore, you can judge the heating position. Smell whether the hydraulic oil has foul smell or pungent spicy smell. If so, it indicates that the hydraulic oil has been seriously polluted and can no longer be used.

视觉诊断法：是用眼睛来观察液压系统工作情况，观察液压系统各测压点的压力值、温度变化情况，检查油液是否清洁、油量是否充足。观察液压阀及管路接头处、液压缸端盖处、液压泵传动轴处等是否有漏油现象。观察从设备加工出的产品或所进行的性能试验，鉴别运动机构的工作状态、系统压力和流量的稳定性以及电磁阀的工作状态等。

Visual diagnosis method: use eyes to observe the working condition of the hydraulic system, observe the pressure value and temperature change of each pressure measuring point of the hydraulic system, and check whether the oil is clean and sufficient. Observe whether there is oil leakage at the hydraulic valve and pipeline joints, the end cover of the hydraulic cylinder and the transmission shaft of the hydraulic pump. Observe the products processed from the equipment or the performance test, and identify the working state of the moving mechanism, the stability of system pressure and flow, and the working state of the solenoid valve.

听觉诊断法：是用耳朵来判断液压系统或元件的工作是否正常等。听液压泵和液压系统噪声是否过大;听溢流阀等元件是否有异常声音;听工作台换向时冲击声是否过大;听活塞是否有冲撞液压缸底的声音等。

Auditory diagnosis: it uses the ear to judge whether the hydraulic system or components work normally, etc. Listen to whether the noise of hydraulic pump and hydraulic system is too loud; Listen to the overflow valve and other components for abnormal sound; Listen to whether the impact sound is too loud when the workbench is reversing; Listen to whether the piston collides with the bottom of the hydraulic cylinder.

触觉诊断法：是用手触摸运动部件的温度和工作状态，用手触摸液压泵外壳、油箱外壁和阀体外壳的温度。正常温度应在55℃左右，如果超过60℃以上就应检明原因。用手触摸运动部件和油管，感觉有无明显振动。

Tactile diagnosis method: touch the temperature and working state of moving parts with hands, and touch the temperature of hydraulic pump shell, outer wall of oil tank and valve body shell with hands. The normal temperature should be about 55 ℃. If it exceeds 60 ℃, the reason should be found out. Touch the moving parts and oil pipes with your hands to feel whether there is obvious vibration.

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