Through the above analysis, we can obtain important information about the exact terms of wear of the system. According to further study the wear phenomena, monitoring the wear status, Yulin mixer maintenance, diagnostic trouble precursor, and finally make the system failure prediction. Machining accuracy due to the impact, causing the main valve radial clamping, mixer maintenance organization, not on the main valve opening pressure or primary pressure relief valve is not closed, and the other due to pollution caused by radial clamping. Relief in the use of the regulator failures that sometimes occur. Pilot relief valve regulator failures that have two kinds of situations: one is to adjust the pressure regulator handwheel can not be established, or a pressure less than the rated value; the other hand wheel adjustment pressure does not drop, and even continue to boost. Appears regulator failure, in addition to the spool due to various causes radial clamping, there are some of the following reasons: