更換液壓油的正確步驟是排空液壓郵箱中的液壓油，清洗油箱并添加新的液壓油，然后拆下回路集管，啟動發動機并運轉緩慢，使油泵工作，分別操作各機構，依靠液壓油將回路中的舊油一一排出，直新油流出回油主管。之后，將回油主管連接到油箱，將新的液壓油加入油箱指定位置。

The correct procedure for replacing hydraulic oil is to drain the hydraulic oil in the hydraulic mailbox, clean the oil tank and add new hydraulic oil, then remove the circuit header, start the engine and run slowly to make the oil pump work, operate each mechanism separately, and drain the old oil in the circuit one by one by relying on the hydraulic oil until the new oil flows out of the oil return main pipe. After that, connect the oil return main pipe to the oil tank and add new hydraulic oil to the oil tank to the specified position.

清洗液壓油泵

Clean the hydraulic oil pump

很多人對液壓油的更換有一個錯誤的認識，認為只需將液壓系統中的舊液壓油放掉，重新加注新的液壓油即可。這種做法對液壓系統是非常有害的。新舊油混用不僅會加速新油的變質，還會對液壓系統的元件造成污染。因此，大蘭液壓提醒大家，在更換液壓油時，一定要將液壓油泵清洗干凈后再添加新油。

Many people have a wrong idea about the replacement of hydraulic oil. They think that it is only necessary to drain the old hydraulic oil in the hydraulic system and refill the new hydraulic oil. This practice is very harmful to the hydraulic system. Mixing old and new oil will not only accelerate the deterioration of new oil, but also pollute the components of hydraulic system. Therefore, Dalan hydraulic reminds us that when replacing hydraulic oil, we must clean the hydraulic oil pump before adding new oil.

清洗回油管

Clean the oil return pipe

清洗自動混凝土攪拌機的液壓系統中的液壓缸并不意味著整個液壓系統中沒有舊油。事實上，此時電路集管內的油還是舊的，必須清理干凈。因此，更換液壓缸新油后，拆下回路總管，啟動發動機低速運轉，使油泵工作，各機構分開操作，將回路中的舊油逐一排出。液壓油，直到它返回油主管。有新油流出的地方。

Cleaning the hydraulic cylinder in the hydraulic system of the automatic concrete mixer does not mean that there is no old oil in the whole hydraulic system. In fact, the oil in the circuit header is still old and must be cleaned. Therefore, after the hydraulic cylinder is replaced with new oil, remove the main circuit pipe, start the engine to run at a low speed, make the oil pump work, operate each mechanism separately, and discharge the old oil in the circuit one by one. Hydraulic oil until it returns to the oil main pipe. Where new oil flows out.

補油充足

Sufficient oil make-up

當清洗液壓缸并回路總管中的舊油時，整個液壓系統中不會有舊油。此時可以向液壓系統中的信箱充分補充油液，直達到規定位置。此，整個液壓系統的換油工作順利完成。

When the hydraulic cylinder is cleaned and the old oil in the circuit header is removed, there will be no old oil in the whole hydraulic system. At this time, oil can be fully added to the mailbox in the hydraulic system until it reaches the specified position. So far, the oil change of the whole hydraulic system has been successfully completed.

對于一些大型液壓系統來說，更換回油主管中的舊油需要大量的液壓油，而且每個液壓系統的回油管不止一根，一根一根的拆卸起來很麻煩。因此，更換液壓油的方法需要進一步改進。

For some large hydraulic systems, replacing the old oil in the oil return main pipe requires a large amount of hydraulic oil, and there is more than one oil return pipe in each hydraulic system, which is very troublesome to disassemble one by one. Therefore, the method of changing hydraulic oil needs to be further improved.

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