Extruder hydraulic extrusion screen changer installation direction generally according to the extruder site conditions and operating preferences can be divided into the following ways: 1, the cylinder upward installation using this way of installation, easy lifting, overall beauty, occupies a small space; the bad thing is that the cylinder is on the top, the seal inside the cylinder has a short life, easy to leak oil, seal replacement is frequent. The oil pipe is long. 2, cylinder horizontal ins