1、泵芯磨损：泵芯与轴之间，泵壳与轴之间，活塞之间均有接触；当柱塞泵工作时，由于内部温度升高而产生冲击作用；在摩擦作用下泵芯与轴之间的间隙逐渐变小当发生过压保护故障时发动机可能不工作至规定的极限状态；当过压保护开关失灵时可能导致严重的安全事故。
2、密封失效：由于密封失效使泵进入气缸的空气减少，泵腔中的杂质和气泡增多从而引起泵内气体膨胀或爆炸3、机械磨损：由于柱塞泵过压保护功能的失效（例如阀杆密封垫片和压盖密封件损坏）会导致泵的机械强度下降，进而导致机器的部件寿命降低。
4、泄漏增加；由于过压保护功能失效会造成吸入空气减少而使进气不足 1、过压保护作用： 柱塞泵在工作时，由于泵内的压力变化导致压力容器内压力上升，此时如过压保护开关失灵，会使空气进入系统形成不平衡状态，从而导致进排气系统不平衡（俗称“闷缸”）。
此时若对进排气阀门进行保护，就可以防止进排气阀门之间的压力变化以及吸入系统中的气体发生爆炸但是过压保护开关具有一种“非接触式”保护作用——当柱塞泵启动时不能正常运转，当系统达到额定压力时又能正常运转过压保护功能就在这个时候发挥作用了。
2、对设备的影响 (1)影响正常运转：当发生故障时，由于流量的突然变化，造成泵腔中气体体积突然增加，导致活塞产生瞬间的压力剧增此时缸体可能因压力剧增而引起活塞产生局部过热现象(2)缩短设备寿命：由于过压保护故障时泵被压盖压住，密封不严易造成泄漏、振动等问题。
(3)损坏零件：由于压盖密封垫片受损或漏气引起泵排气不足并发生高温高压的危害因此必须加强对过压保护开关的维护管理和保养工作(4)缩短设备寿命：由于柱塞泵长期运转会产生大量微小气泡，使活塞承受高温高压而产生热应力，活塞热应力将造成液压元件损坏和泵件泄漏。
90-L-180-HF-5-BC-80-S-M-C8-H-03-NNN-32-14-30 90L180HF5BC80SMC8H03NNN321430 90L180-HF-5-BC-80-S-M-C8-J-03-NNN-32-32-24 90L180HF5BC80SMC8J03NNN323224 90-L-180-HF-5-BC-80-S-M-C8-J-03-NNN-32-32-24 90L180HF5BC80SMC8J03NNN323224 90L180-HF-5-BC-80-T-C-C8-H-03-NNN-32-32-24 90L180HF5BC80TCC8H03NNN323224 90-L-180-HF-5-BC-80-T-C-C8-H-03-NNN-32-32-24 90L180HF5BC80TCC8H03NNN323224 90L180-HF-5-BC-80-T-C-C8-J-03-NNN-32-32-24 90L180HF5BC80TCC8J03NNN323224 90-L-180-HF-5-BC-80-T-C-C8-J-03-NNN-32-32-24 90L180HF5BC80TCC8J03NNN323224 90L180-HF-5-BC-80-T-M-F1-H-03-FAC-23-23-24 90L180HF5BC80TMF1H03FAC232324 90-L-180-HF-5-BC-80-T-M-F1-H-03-FAC-23-23-24 90L180HF5BC80TMF1H03FAC232324 90L180-HF-5-CD-80-S-C-C8-H-03-NNN-30-30-28 90L180HF5CD80SCC8H03NNN303028 90-L-180-HF-5-CD-80-S-C-C8-H-03-NNN-30-30-28 90L180HF5CD80SCC8H03NNN303028 90L180-HF-5-CD-80-S-C-C8-H-03-NNN-35-35-28 90L180HF5CD80SCC8H03NNN353528 90-L-180-HF-5-CD-80-S-C-C8-H-03-NNN-35-35-28 90L180HF5CD80SCC8H03NNN353528 90L180-HF-5-CD-80-S-C-C8-J-03-NNN-35-35-28 90L180HF5CD80SCC8J03NNN353528 90-L-180-HF-5-CD-80-S-C-C8-J-03-NNN-35-35-28 90L180HF5CD80SCC8J03NNN353528 90L180-HF-5-CD-80-S-M-F1-H-03-FAC-14-14-22 90L180HF5CD80SMF1H03FAC141422 90-L-180-HF-5-CD-80-S-M-F1-H-03-FAC-14-14-22 90L180HF5CD80SMF1H03FAC141422 90L180-HF-5-CD-80-T-C-C8-J-03-NNN-35-35-28 90L180HF5CD80TCC8J03NNN353528 90-L-180-HF-5-CD-80-T-C-C8-J-03-NNN-35-35-28 90L180HF5CD80TCC8J03NNN353528 90L180-HF-5-CD-80-T-C-F1-H-03-FAC-35-35-24 90L180HF5CD80TCF1H03FAC353524 90-L-180-HF-5-CD-80-T-C-F1-H-03-FAC-35-35-24 90L180HF5CD80TCF1H03FAC353524 90L180-HF-5-CD-80-T-C-F1-J-03-EBA-42-42-24 90L180HF5CD80TCF1J03EBA424224 90-L-180-HF-5-CD-80-T-C-F1-J-03-EBA-42-42-24 90L180HF5CD80TCF1J03EBA424224 90L180-HF-5-CD-80-T-M-C8-J-03-NNN-38-38-28 90L180HF5CD80TMC8J03NNN383828 90-L-180-HF-5-CD-80-T-M-C8-J-03-NNN-38-38-28 90L180HF5CD80TMC8J03NNN383828 90L180-HF-5-CD-80-T-M-C8-J-03-NNN-42-42-28 90L180HF5CD80TMC8J03NNN424228 90-L-180-HF-5-CD-80-T-M-C8-J-03-NNN-42-42-28 90L180HF5CD80TMC8J03NNN424228 90L180-HF-5-CD-80-T-M-F1-H-03-FAC-35-35-24 90L180HF5CD80TMF1H03FAC353524 90-L-180-HF-5-CD-80-T-M-F1-H-03-FAC-35-35-24 90L180HF5CD80TMF1H03FAC353524 90L180-HF-5-DE-80-S-C-C8-J-03-NNN-32-32-28 90L180HF5DE80SCC8J03NNN323228 90-L-180-HF-5-DE-80-S-C-C8-J-03-NNN-32-32-28 90L180HF5DE80SCC8J03NNN323228 90L180-HF-5-DE-80-S-C-F1-J-03-NNN-32-32-28 90L180HF5DE80SCF1J03NNN323228 90-L-180-HF-5-DE-80-S-C-F1-J-03-NNN-32-32-28 90L180HF5DE80SCF1J03NNN323228 90L180-HF-5-DE-80-T-C-C8-J-03-NNN-35-35-24 90L180HF5DE80TCC8J03NNN353524 90-L-180-HF-5-DE-80-T-C-C8-J-03-NNN-35-35-24 90L180HF5DE80TCC8J03NNN353524 90L180-HF-5-DE-80-T-C-F1-J-03-FAC-23-23-28 90L180HF5DE80TCF1J03FAC232328 90-L-180-HF-5-DE-80-T-C-F1-J-03-FAC-23-23-28 90L180HF5DE80TCF1J03FAC232328 90L180-HF-5-EF-80-T-M-F1-H-03-EBA-38-38-24 90L180HF5EF80TMF1H03EBA383824 90-L-180-HF-5-EF-80-T-M-F1-H-03-EBA-38-38-24 90L180HF5EF80TMF1H03EBA383824 90L180-HF-5-EG-80-S-C-C8-H-03-NNN-35-35-28 90L180HF5EG80SCC8H03NNN353528 90-L-180-HF-5-EG-80-S-C-C8-H-03-NNN-35-35-28 90L180HF5EG80SCC8H03NNN353528 90L180-HF-5-NN-80-S-C-C8-J-03-NNN-38-38-24 90L180HF5NN80SCC8J03NNN383824 90-L-180-HF-5-NN-80-S-C-C8-J-03-NNN-38-38-24 90L180HF5NN80SCC8J03NNN383824 90L180-HF-5-NN-80-S-C-C8-J-05-NNN-42-42-30 90L180HF5NN80SCC8J05NNN424230 90-L-180-HF-5-NN-80-S-C-C8-J-05-NNN-42-42-30 90L180HF5NN80SCC8J05NNN424230 90L180-HF-5-NN-80-S-C-F1-H-04-NNN-40-40-24 90L180HF5NN80SCF1H04NNN404024 90-L-180-HF-5-NN-80-S-C-F1-H-04-NNN-40-40-24 90L180HF5NN80SCF1H04NNN404024 90L180-HF-5-NN-80-S-C-F1-J-03-NNN-42-42-24 90L180HF5NN80SCF1J03NNN424224 90-L-180-HF-5-NN-80-S-C-F1-J-03-NNN-42-42-24 90L180HF5NN80SCF1J03NNN424224 90L180-HF-5-NN-80-S-M-F1-H-03-FAC-32-14-30 90L180HF5NN80SMF1H03FAC321430 90-L-180-HF-5-NN-80-S-M-F1-H-03-FAC-32-14-30 90L180HF5NN80SMF1H03FAC321430 90L180-HF-5-NN-80-T-C-F1-J-03-FAC-35-35-24 90L180HF5NN80TCF1J03FAC353524 90-L-180-HF-5-NN-80-T-C-F1-J-03-FAC-35-35-24 90L180HF5NN80TCF1J03FAC353524 90L180-HF-5-NN-80-T-C-F1-J-03-NNN-38-38-24 90L180HF5NN80TCF1J03NNN383824 90-L-180-HF-5-NN-80-T-C-F1-J-03-NNN-38-38-24 90L180HF5NN80TCF1J03NNN383824 90L180-HF-5-NN-80-T-C-F1-J-03-NNN-42-42-24 90L180HF5NN80TCF1J03NNN424224 90-L-180-HF-5-NN-80-T-C-F1-J-03-NNN-42-42-24 90L180HF5NN80TCF1J03NNN424224。
