(1).Check if the temperature of the screw cylinder is sufficient and if the heaters are in good condition.
(2).Check if the hydraulic motor breaks down.
(3).Check if the directional valve is blocked by foreign matters.
(4).Check if the temperature of the rear of the screw cylinder is too high.
(5).Check if foreign matters enter the screw cylinder.
(6).Check if the pre-plasticizing pressure is high enough.
(7).Check if the end position of the melting travel is correct.
(8).Check if the speed of the pre-plasticizing process is too low.