Press consists of two parts consisting of hydraulic and pressing machine, its common faults and troubleshooting methods are as follows. Oil from the hydraulic cylinder and piston gap escape reason is: ① cup sized up installed wrong; ② cup damaged. Remedy is: Reinstall cups, replace the new cup. Pressing screw shaft by a number of pressing bolts and pitch circle mounting on the shaft composition. Each pressing bolts and nuts have a certain pitch dark, how much automatic hydraulic press, and a shaft of each pressing screw pitch from the feed port to the discharge port is gradually shortened, deep spiral faded, whole automatic hydraulic press, thus making virgin bore volume decreases from the inlet to the outlet, the blanks into the virgin bore the trailing edge pressing screw spiral level advance to the exit, gradually increase the pressure on so that the oil gradually squeezed out. Inter-shaped squeeze cage cage bars and juice bars installed gasket to form the oil gap, automatic hydraulic press Which is good, out of crude oil flowing through this gap. Large screw press expeller cage is also equipped with a blade, scraper mouth pressed deep bore, aligned with each press from the circle to prevent the preform pressing bore slip in and prevent the return of the blank, and to regulate the cake thickness, thereby pressing the corresponding control the chamber pressure to reduce residual oil rate.