?1、機器故障的類型及原因 機械故障預防和故障診斷兩個部分在預防上：主要是對機件做好日常的保養，比如每天都要做保養，以及對機械進行定期維護等；在診斷上：主要是根據故障所表現出來的形式來進行判斷；在排除故障上：主要是對機器的內部部件進行細致檢測等。
2、判斷挖掘機液壓系統故障與失效的原因 液壓系統故障與失效的原因是復雜多變的，而主要的分析判斷依據是：液壓缸內部各缸孔之間的間隙和密封件間的間隙及其相互配合位置、閥件位置以及密封件工作條件等要對液壓系統故障與失效進行判斷，首先要確定內部的故障。
由于挖掘機液壓系統工作中受到很多因素地影響，其內部都有可能會出現故障，因此就需要了解液壓系統故障與失效的原因，對各個可能造成故障和失效的部位和原因進行檢查、檢測與分析 3、通過診斷液壓系統故障引起的故障 液壓系統中若出現了大量的油液流量過小、壓力過低或過高、泵出現堵塞或泵芯、閥芯有異物磨損等現象時，則應檢查其液壓系統中是否存在液壓油變質、油中混入雜質、系統中有污物、系統管路或元件出現損壞等情況，若有這些現象，則可根據系統的故障程度來判斷故障發生的部位和程度。
若有液壓系統中沒有出現類似的問題，則可直接用儀表對其進行監控；若有多個液壓系統中只有一個出現故障并排除后，則可先用其他儀表觀察故障若是這些油液的流量過小或過高等現象，則可能是液壓系統本身存在故障；如果液壓系統中的油液流動很正常并無異?，F象，但在某一時刻突然出現流量過大或過小等現象時就需引起注意了。
4、維修策略及流程 在我國，對于挖掘機維修的整個流程一般分為技術指導、現場檢查、故障排除、維修總結5個步驟但是由于我國的發展程度不同，采取不同的維修策略，所以對于挖掘機的維修整個流程要有一定的變化技術指導：技術指導的原則是：先現場檢查，再檢修，最后再維修，保證故障發生時，能夠快速、準確地找到故障原因并及時處理，使機械能夠正常工作。
5、其他輔助措施 在修理挖掘機時，應選用質量可靠的原廠零部件，而且修理前應根據工程要求進行試車，試驗確定是否合格，必要時進行加工，如有不合格應當及時進行整改修理完成后，應經過試運轉、檢測及確認無誤后方可出廠合格。
禁止修理人員私自拆改總成、拆換零件、拆卸電器部件及操作電器設備修理過程中，應嚴格遵守操作規程和技術標準同時要注意觀察、注意安全以及工程質量問題 90-L-130-KA-5-BC-80-S-3-C8-H-03-GBA-35-35-24 90L130KA5BC80S3C8H03GBA353524 90-L-130-KA-5-BC-80-S-3-C8-H-03-GBA-38-38-26 90L130KA5BC80S3C8H03GBA383826 90L130-KA-5-BC-80-S-3-C8-H-03-GBA-42-42-24 90L130KA5BC80S3C8H03GBA424224 90-L-130-KA-5-BC-80-S-3-C8-H-03-GBA-42-42-24 90L130KA5BC80S3C8H03GBA424224 90L130-KA-5-BC-80-S-3-C8-H-03-GBA-42-42-28 90L130KA5BC80S3C8H03GBA424228 90-L-130-KA-5-BC-80-S-3-C8-H-03-GBA-42-42-28 90L130KA5BC80S3C8H03GBA424228 90L130-KA-5-BC-80-S-3-C8-H-03-GBA-42-42-30 90L130KA5BC80S3C8H03GBA424230 90-L-130-KA-5-BC-80-S-3-C8-H-03-GBA-42-42-30 90L130KA5BC80S3C8H03GBA424230 90L130-KA-5-BC-80-S-3-C8-H-04-GBA-35-35-24 90L130KA5BC80S3C8H04GBA353524 90-L-130-KA-5-BC-80-S-3-C8-H-04-GBA-35-35-24 90L130KA5BC80S3C8H04GBA353524 90L130-KA-5-BC-80-S-3-C8-H-04-GBA-38-38-24 90L130KA5BC80S3C8H04GBA383824 90-L-130-KA-5-BC-80-S-3-C8-H-04-GBA-38-38-24 90L130KA5BC80S3C8H04GBA383824 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