这主要是JB—218径向柱塞泵高压三角阀座上的弹簧折断引起的。原因是:该泵依靠阀门开关进行工作,当发动机满负荷时,油泵转速高达1800转/分,此时高压阀的开闭次数为30次/分,则弹簧伸缩也是30次/分,因弹簧长时间伸缩疲劳而折断,使高压三角阀阀芯跳出,顶在限位柱上断裂。 This is mainly caused by the spring breakage on the high-pressure triangular seat of JB-218 radial piston pump. The reason is: The pump relies on the valve switch to work, when the engine is full load, the pump speed up to 1800 r / min, high pressure valve at this time the number of opening and closing 30 times / min, the spring retractable is 30 times / min, due to the spring Stretching fatigue for a long time and broken, so that high-pressure triangular valve pop-up, the top of the column in the limit fracture.