由于柱塞密封圈老化或回位而引起的故障：一般由于油道堵塞、油质过浓、润滑油不清洁或杂质太多等原因引起，若这种故障长期没有得到解决，则必须更换机油，但此时油量必须充足另外，油量不足时，有时会出现柱塞回压不正常现象（油泵吸油),这时应检查柱塞密封面上是否积油、锈蚀脱落等情况。
如果密封面上积油过多影响传热，甚至造成轴承烧坏，这时应将其清除或更换新润滑油；如果柱塞密封面上积液较多，此时应采用高温高压吹扫的方法清理，直到清理干净为止；如果轴瓦和连杆轴颈磨损严重，必须更换轴瓦；如果是轴瓦中间部分发生断裂后，应更换连杆；如果是连杆磨损引起柱塞回压不均而引起的故障：如果是油封上有锈迹堵塞时，应彻底清洗油封或更换新油封；如果是油管弯曲或脱落时引起的故障：如果是油封处有异物堵塞时，应彻底清除异物；如果是密封垫老化或损坏造成的故障：若密封垫已断裂时，应重新更换损坏密封垫；如果密封垫之间还存在空隙时，应重新调整间隙；如果密封垫损坏或泄漏引起的故障：必须更换密封垫；如果轴承室和连杆轴颈间有泄漏导致柱塞回位而引起系统运转不稳时，应更换密封垫；如果轴瓦和连杆轴颈之间有破损或泄漏引起了系统运转不稳时，应更换轴瓦和连杆轴颈。
检查液压油的温度、压力、油液的污染、油质等情况是否正常，并检查各接头是否松动，是否有杂物堵塞或漏出，各接头是否有渗油情况、各密封圈是否有损坏、各压力表是否正常若液压油过脏或油液污染严重时应更换液压油；若活塞卡滞导致液压油无法流入油缸，应清洗活塞杆，更换活塞；如果泵内充满液体或气体，应拆下泵盖进行检查，防止油液进入泵内。
90-L-100-KT-1-BC-60-P-3-T2-E-03-GBA-32-32-24 90L100KT1BC60P3T2E03GBA323224 90-L-100-KT-1-BC-60-P-3-T2-E-03-GBA-35-35-24 90L100KT1BC60P3T2E03GBA353524 90-L-100-KT-1-BC-80-L-4-S1-F-03-GBA-40-40-20 90L100KT1BC80L4S1F03GBA404020 90-L-100-KT-1-BC-80-P-3-F1-E-03-GBA-35-35-24 90L100KT1BC80P3F1E03GBA353524 90-L-100-KT-1-BC-80-P-3-F1-E-03-GBA-38-38-24 90L100KT1BC80P3F1E03GBA383824 90-L-100-KT-1-BC-80-P-3-F1-E-03-GBA-45-45-24 90L100KT1BC80P3F1E03GBA454524 90-L-100-KT-1-BC-80-R-3-F1-E-03-GBA-38-38-24 90L100KT1BC80R3F1E03GBA383824 90-L-100-KT-1-BC-80-R-3-F1-E-03-GBA-45-45-24 90L100KT1BC80R3F1E03GBA454524 90-L-100-KT-1-BC-80-R-3-F1-F-03-GBA-42-42-24 90L100KT1BC80R3F1F03GBA424224 90-L-100-KT-1-CD-80-L-3-C7-F-00-GBA-42-42-28 90L100KT1CD80L3C7F00GBA424228 90L100-KT-1-CD-80-R-3-C6-F-03-GBA-42-42-24 90L100KT1CD80R3C6F03GBA424224 90-L-100-KT-1-CD-80-R-3-C6-F-03-GBA-42-42-24 90L100KT1CD80R3C6F03GBA424224 90-L-100-KT-1-CD-80-R-3-F1-E-03-GBA-42-42-24 90L100KT1CD80R3F1E03GBA424224 90-L-100-KT-1-CD-80-S-3-C7-F-00-GBA-42-38-28 90L100KT1CD80S3C7F00GBA423828 90-L-100-KT-1-CD-80-S-3-S1-E-03-GBA-42-42-24 90L100KT1CD80S3S1E03GBA424224 90-L-100-KT-1-CD-80-S-3-S1-E-05-GBA-42-42-24 90L100KT1CD80S3S1E05GBA424224 90-L-100-KT-1-NN-60-P-4-S1-F-03-GBA-35-35-24 90L100KT1NN60P4S1F03GBA353524 90-L-100-KT-1-NN-60-R-3-S1-F-06-GBA-14-14-20 90L100KT1NN60R3S1F06GBA141420 90-L-100-KT-1-NN-60-R-3-S1-F-06-GBA-35-35-20 90L100KT1NN60R3S1F06GBA353520 90-L-100-KT-1-NN-80-L-3-S1-E-03-GBA-17-32-24 90L100KT1NN80L3S1E03GBA173224 90-L-100-KT-1-NN-80-L-4-S1-F-03-GBA-40-40-20 90L100KT1NN80L4S1F03GBA404020 90L100-KT-1-NN-80-R-3-C6-F-03-GBA-42-42-26 90L100KT1NN80R3C6F03GBA424226 90-L-100-KT-1-NN-80-R-3-C6-F-03-GBA-42-42-26 90L100KT1NN80R3C6F03GBA424226 90-L-100-KT-1-NN-80-S-3-C7-F-00-GBA-42-38-28 90L100KT1NN80S3C7F00GBA423828 90-L-100-KT-1-NN-80-S-3-S1-E-03-GBA-42-42-24 90L100KT1NN80S3S1E03GBA424224 90-L-100-KT-1-NN-80-S-3-S1-E-05-GBA-42-42-24 90L100KT1NN80S3S1E05GBA424224 90-L-100-KT-2-AB-60-P-3-S1-E-03-GBA-35-35-24 90L100KT2AB60P3S1E03GBA353524 90-L-100-KT-2-AB-60-R-4-S1-E-03-GBA-35-35-24 90L100KT2AB60R4S1E03GBA353524 90L100-KT-2-AB-60-R-4-S1-E-03-GBA-35-35-24 90L100KT2AB60R4S1E03GBA353524 90-L-100-KT-2-AB-80-P-4-S1-F-00-GBA-32-32-24 90L100KT2AB80P4S1F00GBA323224 90-L-100-KT-2-CD-60-P-3-F1-E-03-GBA-35-35-24 90L100KT2CD60P3F1E03GBA353524 90-L-100-KT-2-CD-60-R-4-F1-E-03-GBA-35-35-24 90L100KT2CD60R4F1E03GBA353524 90L100-KT-2-CD-60-R-4-F1-E-03-GBA-35-35-24 90L100KT2CD60R4F1E03GBA353524 90-L-100-KT-2-CD-80-P-4-F1-F-00-GBA-32-32-24 90L100KT2CD80P4F1F00GBA323224 90-L-100-KT-5-AB-80-P-4-S1-F-00-GBA-32-32-24 90L100KT5AB80P4S1F00GBA323224 90-L-100-KT-5-BC-80-P-3-S1-F-03-GBA-38-38-24 90L100KT5BC80P3S1F03GBA383824 90-L-100-KT-5-BC-80-P-3-T2-E-03-GBA-38-38-20 90L100KT5BC80P3T2E03GBA383820 90-L-100-KT-5-BC-80-R-3-S1-F-03-GBA-35-35-24 90L100KT5BC80R3S1F03GBA353524 90-L-100-KT-5-CD-80-P-3-T2-F-03-GBA-38-38-24 90L100KT5CD80P3T2F03GBA383824 90-L-100-KT-5-CD-80-P-4-F1-F-00-GBA-32-32-24 90L100KT5CD80P4F1F00GBA323224 90-L-100-KT-5-NN-80-P-3-S1-F-03-GBA-35-35-24 90L100KT5NN80P3S1F03GBA353524 90-L-100-KT-5-NN-80-P-4-S1-F-00-GBA-32-32-24 90L100KT5NN80P4S1F00GBA323224。
