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.

視覺診斷法：是用眼睛來觀察液壓系統(tǒng)工作情況，觀察液壓系統(tǒng)各測壓點的壓力值、溫度變化情況，檢查油液是否清潔、油量是否充足。觀察液壓閥及管路接頭處、液壓缸端蓋處、液壓泵傳動軸處等是否有漏油現(xiàn)象。觀察從設(shè)備加工出的產(chǎn)品或所進(jìn)行的性能試驗，鑒別運動機(jī)構(gòu)的工作狀態(tài)、系統(tǒng)壓力和流量的穩(wěn)定性以及電磁閥的工作狀態(tài)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.

聽覺診斷法：是用耳朵來判斷液壓系統(tǒng)或元件的工作是否正常等。聽液壓泵和液壓系統(tǒng)噪聲是否過大;聽溢流閥等元件是否有異常聲音;聽工作臺換向時沖擊聲是否過大;聽活塞是否有沖撞液壓缸底的聲音等。

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.

觸覺診斷法：是用手觸摸運動部件的溫度和工作狀態(tài)，用手觸摸液壓泵外殼、油箱外壁和閥體外殼的溫度。正常溫度應(yīng)在55℃左右，如果超過60℃以上就應(yīng)檢明原因。用手觸摸運動部件和油管，感覺有無明顯振動。

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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