Before replacing hydraulic oil, everyone needs to check whether the hydraulic oil filter is installed(oil suction filter), because the hydraulic oil filter is the first barrier to protect the entire system. Once the installation is forgotten, the impurity is added. The lightest consequence is to speed up the wear of the large pump. Serious may cause the pump to fail to work.
In addition, the filter is consumable, so blocked or to the replacement time, the change must be changed in time, do not delay!