原文：
混凝土泵车不能泵送的故障原因分析： 一台SY5255型37m泵车在泵送完成，回搅拌站洗车时出现升速正常，正、反泵均不能泵送的故障。升速正常说明PLC可以检测到分动箱的速度信号，继续检查泵送点控Q2.0、Q2.1，点亮正常说明电控信号正常，应重点检查液压控制系统。 (1)DT1/DT2电磁阀线圈是否短路、开路或电磁阀至PLC线路是否有故障。 (2) DT1电磁阀是否卡死，导致溢流阀溢流压力建立不起来，DT2电磁阀阀芯若中位卡死会导致正、反泵失控。 (3)主泵是否有故障。 检查发现： (1)正、反泵观察压力表，压力为0，系统无压力。 (2)检测DT1电磁阀来电正常， 后手动顶其阀芯，故障依旧。 (3)怀疑溢流阀阀芯卡死，拆开顶盖取出阀芯，阀芯上、下移动灵活正常；去掉弹簧，用5个硬币代替，装上阀芯盖板，试机故障依旧，说明 溢流阀正常。 (4)继续检测，发现动臂架及活塞缩回所有功能均不正常，速度能自动调节，同时发现3个压力表均显示零。说明故障应该在主泵压力输出部分。 (5)分析泵送电磁阀来电正常，就可以说明行驶、泵送位置检测应该正常，但是重新检测：I2.5点亮，分动箱位置检测接近开关点亮，汽车行驶、泵送动作随驾驶室操作动作正常，说明行驶、泵送控制电路无故障。发动机升速正常，而系统无压力，位置检测又无故障，因此判定故障为分动箱内部拨叉出现问题。 (6)拆开分动箱，检查发现第三根主轴花键和齿轮损坏，更换后故障彻底排除。

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译文：
Concrete pump can not pump the Fault Analysis: A SY5255-type pump in the pumping 37m complete back mixing is accelerated when the normal car wash, positive and negative pumps are not pumping the malfunction. L shows the normal speed PLC can detect the speed of signal transfer case, continue to check the pumping point control Q2.0, Q2.1, light shows normal electrical control signal to normal inspection should focus on hydraulic control system. (1) DT1/DT2 solenoid valve coil is short-circuit, open circuit or solenoid valve to the PLC circuit is faulty. (2) DT1 solenoid valve is stuck, causing the pressure relief valve overflow not be established, DT2 spool valve stuck if the median would lead to positive and negative pump out of control. (3) whether the main pump failure. Check that: (1) is, observation of anti-pump pressure gauge, pressure of 0, the system without pressure. (2) detection of the normal call DT1 solenoid valve, manually after the top of its spool, fault still. (3) suspected relief valve spool stuck, open the top cover removed spool, spool, the next mobile and flexible normal; remove the spring, with a 5 coin to replace, installed spool cover, test machine malfunction persists shows the normal relief valve. (4) continue testing and found that moving arm and the piston retracted all of the features are not normal, the speed can be adjusted automatically also found that the three pressure gauges show zero. Interruption should be part of the main pump pressure output. (5) of the normal pump solenoid valve calls, you can explain driving, pumping position detection should be normal, but the re-testing: I2.5 light, transfer case position detection close to the light switches, automobile driving, pumping action with the Action Cab normal operation, driving instructions, trouble-free pump control circuit. Engine liters of normal speed, while the system without pressure, position detection nor a failure, the failure to transfer case determined within the fork problems. (6) open the transfer case, inspection found that the third root of the spline shaft and gear damage, replacement failure ruled out.