1、机器故障的类型及原因 机械故障预防和故障诊断两个部分在预防上：主要是对机件做好日常的保养，比如每天都要做保养，以及对机械进行定期维护等；在诊断上：主要是根据故障所表现出来的形式来进行判断；在排除故障上：主要是对机器的内部部件进行细致检测等。
2、判断挖掘机液压系统故障与失效的原因 液压系统故障与失效的原因是复杂多变的，而主要的分析判断依据是：液压缸内部各缸孔之间的间隙和密封件间的间隙及其相互配合位置、阀件位置以及密封件工作条件等要对液压系统故障与失效进行判断，首先要确定内部的故障。
由于挖掘机液压系统工作中受到很多因素地影响，其内部都有可能会出现故障，因此就需要了解液压系统故障与失效的原因，对各个可能造成故障和失效的部位和原因进行检查、检测与分析 3、通过诊断液压系统故障引起的故障 液压系统中若出现了大量的油液流量过小、压力过低或过高、泵出现堵塞或泵芯、阀芯有异物磨损等现象时，则应检查其液压系统中是否存在液压油变质、油中混入杂质、系统中有污物、系统管路或元件出现损坏等情况，若有这些现象，则可根据系统的故障程度来判断故障发生的部位和程度。
若有液压系统中没有出现类似的问题，则可直接用仪表对其进行监控；若有多个液压系统中只有一个出现故障并排除后，则可先用其他仪表观察故障若是这些油液的流量过小或过高等现象，则可能是液压系统本身存在故障；如果液压系统中的油液流动很正常并无异常现象，但在某一时刻突然出现流量过大或过小等现象时就需引起注意了。
4、维修策略及流程 在我国，对于挖掘机维修的整个流程一般分为技术指导、现场检查、故障排除、维修总结5个步骤但是由于我国的发展程度不同，采取不同的维修策略，所以对于挖掘机的维修整个流程要有一定的变化技术指导：技术指导的原则是：先现场检查，再检修，最后再维修，保证故障发生时，能够快速、准确地找到故障原因并及时处理，使机械能够正常工作。
5、其他辅助措施 在修理挖掘机时，应选用质量可靠的原厂零部件，而且修理前应根据工程要求进行试车，试验确定是否合格，必要时进行加工，如有不合格应当及时进行整改修理完成后，应经过试运转、检测及确认无误后方可出厂合格。
禁止修理人员私自拆改总成、拆换零件、拆卸电器部件及操作电器设备修理过程中，应严格遵守操作规程和技术标准同时要注意观察、注意安全以及工程质量问题 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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