?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、油質過濃、潤滑油不清潔或雜質太多等原因引起，若這種故障長期沒有得到解決，則必須更換機油，但此時油量必須充足另外，油量不足時，有時會出現柱塞回壓不正常現象（油泵吸油),這時應檢查柱塞密封面上是否積油、銹蝕脫落等情況。
如果密封面上積油過多影響傳熱，甚至造成軸承燒壞，這時應將其清除或更換新潤滑油；如果柱塞密封面上積液較多，此時應采用高溫高壓吹掃的方法清理，直到清理干凈為止；如果軸瓦和連桿軸頸磨損嚴重，必須更換軸瓦；如果是軸瓦中間部分發生斷裂后，應更換連桿；如果是連桿磨損引起柱塞回壓不均而引起的故障：如果是油封上有銹跡堵塞時，應徹底清洗油封或更換新油封；如果是油管彎曲或脫落時引起的故障：如果是油封處有異物堵塞時，應徹底清除異物；如果是密封墊老化或損壞造成的故障：若密封墊已斷裂時，應重新更換損壞密封墊；如果密封墊之間還存在空隙時，應重新調整間隙；如果密封墊損壞或泄漏引起的故障：必須更換密封墊；如果軸承室和連桿軸頸間有泄漏導致柱塞回位而引起系統運轉不穩時，應更換密封墊；如果軸瓦和連桿軸頸之間有破損或泄漏引起了系統運轉不穩時，應更換軸瓦和連桿軸頸。
檢查液壓油的溫度、壓力、油液的污染、油質等情況是否正常，并檢查各接頭是否松動，是否有雜物堵塞或漏出，各接頭是否有滲油情況、各密封圈是否有損壞、各壓力表是否正常若液壓油過臟或油液污染嚴重時應更換液壓油；若活塞卡滯導致液壓油無法流入油缸，應清洗活塞桿，更換活塞；如果泵內充滿液體或氣體，應拆下泵蓋進行檢查，防止油液進入泵內。
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。
