更换液压油的正确步骤是排空液压邮箱中的液压油，清洗油箱并添加新的液压油，然后拆下回路集管，启动发动机并运转缓慢，使油泵工作，分别操作各机构，依靠液压油将回路中的旧油一一排出，直新油流出回油主管。之后，将回油主管连接到油箱，将新的液压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.

清洗液压油泵

Clean the hydraulic oil pump

很多人对液压油的更换有一个错误的认识，认为只需将液压系统中的旧液压油放掉，重新加注新的液压油即可。这种做法对液压系统是非常有害的。新旧油混用不仅会加速新油的变质，还会对液压系统的元件造成污染。因此，大兰液压提醒大家，在更换液压油时，一定要将液压油泵清洗干净后再添加新油。

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

清洗自动混凝土搅拌机的液压系统中的液压缸并不意味着整个液压系统中没有旧油。事实上，此时电路集管内的油还是旧的，必须清理干净。因此，更换液压缸新油后，拆下回路总管，启动发动机低速运转，使油泵工作，各机构分开操作，将回路中的旧油逐一排出。液压油，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.

补油充足

Sufficient oil make-up

当清洗液压缸并回路总管中的旧油时，整个液压系统中不会有旧油。此时可以向液压系统中的信箱充分补充油液，直达到规定位置。此，整个液压系统的换油工作顺利完成。

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.

对于一些大型液压系统来说，更换回油主管中的旧油需要大量的液压油，而且每个液压系统的回油管不止一根，一根一根的拆卸起来很麻烦。因此，更换液压油的方法需要进一步改进。

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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