?如果泵輸出壓力下降過大而達不到用戶規定的壓力壓力時，則可能表示液壓泵的液壓泵故障或內部液壓元件損壞或閥件損壞 檢查泵輸出壓力的方法是用氣泵或壓力開關在泵的進出口處進行壓力檢測，其方法是把氣泵或壓力開關置于出口管路上，將管路上的閥門關閉，以減少液壓泵出口壓力在管路內形成的壓力差。
若有一根管道流過泵，而另一根管道未流過則說明泵的液壓泵內部液壓元件損壞；若只有一根管道流過進口泵則說明控制元件損壞對于泵的輸出壓力下降過大或達不到用戶規定壓力時均應引起注意原因主要有：內部元件損壞；壓力開關關閉不嚴；閥門密封不嚴；液壓泵內部零部件磨損；液壓閥件損傷、脫落；閥內部元件間隙大；管路或閥外部磨損等。
檢查時應盡量避免以上問題的出現 5、液壓缸（閥）變形等原因會導致液壓元件的泄露，造成泄漏，因此必須及時檢修或更換 液壓缸（閥）在工作時，閥件受力情況復雜，極易變形或破裂當活塞桿（或活塞桿）間有異物或卡死時，會使活塞桿（或活塞桿）與缸體（閥體）產生振動或摩擦，從而使活塞桿（或活塞桿）泄漏，從而造成液壓系統泄漏。
因此，檢查液壓缸（閥）時應重點檢查泄漏部位由于各部位漏油、磨損、裂紋等原因，造成液壓閥和活塞桿密封失效、動作不良、泄漏嚴重時，就會造成液壓表失準，或液壓缸（閥）失壓因此必須及時修理或更換 對液壓元件進行檢查、檢測 對液壓元件進行檢測，可通過查看元件表面狀態、油位、粘度、液壓缸壓力等參數來進行初步判斷。
如果元件的工作環境溫度在20~30℃，油溫應控制在20℃以下；如果油溫過高，應及時停機檢查，待溫度下降后再安裝對液壓元件的測試方法：用肉眼或觸角觀察液壓元件的內部和外部狀態；用氣棒檢測其是否有泄漏；檢查其內部有無泄漏現象；用肉眼觀察液壓油的顏色、氣味以及其他液體的質量指標。
觀察是否正常等情況，以確認是否有泄漏現象出現并根據這些情況在操作時注意安全問題；防止損壞液壓元件要及時更換新油和清洗；注意觀察液壓元件的磨損情況，避免損壞液壓元件；當發現異常時要及時處理并進行修復更換對檢查后出現問題要及時的處理并將故障消除以后進行再次檢測，避免下次發生類似問題，造成不必要的損失和費用浪費，也要讓廣大客戶了解挖掘機的維修工作原理及質量要求的過程中不會出現影響工作的因素和環節要多了解液壓元件的檢查方法和工作原理以及注意事項：如果機械出現故障的話，那就需要進行維修了！ 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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