如果泵输出压力下降过大而达不到用户规定的压力压力时，则可能表示液压泵的液压泵故障或内部液压元件损坏或阀件损坏 检查泵输出压力的方法是用气泵或压力开关在泵的进出口处进行压力检测，其方法是把气泵或压力开关置于出口管路上，将管路上的阀门关闭，以减少液压泵出口压力在管路内形成的压力差。
若有一根管道流过泵，而另一根管道未流过则说明泵的液压泵内部液压元件损坏；若只有一根管道流过进口泵则说明控制元件损坏对于泵的输出压力下降过大或达不到用户规定压力时均应引起注意原因主要有：内部元件损坏；压力开关关闭不严；阀门密封不严；液压泵内部零部件磨损；液压阀件损伤、脱落；阀内部元件间隙大；管路或阀外部磨损等。
检查时应尽量避免以上问题的出现 5、液压缸（阀）变形等原因会导致液压元件的泄露，造成泄漏，因此必须及时检修或更换 液压缸（阀）在工作时，阀件受力情况复杂，极易变形或破裂当活塞杆（或活塞杆）间有异物或卡死时，会使活塞杆（或活塞杆）与缸体（阀体）产生振动或摩擦，从而使活塞杆（或活塞杆）泄漏，从而造成液压系统泄漏。
因此，检查液压缸（阀）时应重点检查泄漏部位由于各部位漏油、磨损、裂纹等原因，造成液压阀和活塞杆密封失效、动作不良、泄漏严重时，就会造成液压表失准，或液压缸（阀）失压因此必须及时修理或更换 对液压元件进行检查、检测 对液压元件进行检测，可通过查看元件表面状态、油位、粘度、液压缸压力等参数来进行初步判断。
如果元件的工作环境温度在20~30℃，油温应控制在20℃以下；如果油温过高，应及时停机检查，待温度下降后再安装对液压元件的测试方法：用肉眼或触角观察液压元件的内部和外部状态；用气棒检测其是否有泄漏；检查其内部有无泄漏现象；用肉眼观察液压油的颜色、气味以及其他液体的质量指标。
观察是否正常等情况，以确认是否有泄漏现象出现并根据这些情况在操作时注意安全问题；防止损坏液压元件要及时更换新油和清洗；注意观察液压元件的磨损情况，避免损坏液压元件；当发现异常时要及时处理并进行修复更换对检查后出现问题要及时的处理并将故障消除以后进行再次检测，避免下次发生类似问题，造成不必要的损失和费用浪费，也要让广大客户了解挖掘机的维修工作原理及质量要求的过程中不会出现影响工作的因素和环节要多了解液压元件的检查方法和工作原理以及注意事项：如果机械出现故障的话，那就需要进行维修了！ 90L130-KA-5-AB-80-R-3-F1-F-03-GBA-35-35-24 90L130KA5AB80R3F1F03GBA353524 90-L-130-KA-5-AB-80-R-3-F1-F-03-GBA-35-35-24 90L130KA5AB80R3F1F03GBA353524 90L130-KA-5-AB-80-R-3-F1-F-04-GBA-38-38-24 90L130KA5AB80R3F1F04GBA383824 90-L-130-KA-5-AB-80-R-3-F1-F-04-GBA-38-38-24 90L130KA5AB80R3F1F04GBA383824 90L130-KA-5-AB-80-R-3-F1-F-06-GBA-38-38-24 90L130KA5AB80R3F1F06GBA383824 90-L-130-KA-5-AB-80-R-3-F1-F-06-GBA-38-38-24 90L130KA5AB80R3F1F06GBA383824 90L130-KA-5-AB-80-R-3-F1-H-03-GBA-23-23-24 90L130KA5AB80R3F1H03GBA232324 90-L-130-KA-5-AB-80-R-3-F1-H-03-GBA-23-23-24 90L130KA5AB80R3F1H03GBA232324 90L130-KA-5-AB-80-S-3-C8-F-03-GBA-38-38-30 90L130KA5AB80S3C8F03GBA383830 90-L-130-KA-5-AB-80-S-3-C8-F-03-GBA-38-38-30 90L130KA5AB80S3C8F03GBA383830 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