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                                                                                挖掘机行走无力故障的排除

                                                                                编辑: 二手挖掘机  日期:2015-12-18

                                                                                一台已使用了约10年的EX400型挖掘机,其工作装置和回转装置均工作正常,而行走系统却明显地表现出动力不足,但行走并不走偏。

                                                                                通过对该机液压系统的分析知,引起行走系统动不足的原因可能是:液压泵及其控制系统有故障;主卸荷阀失调或被卡死;行走控制系统(如先导油路、控?#21697;?#31561;)有故障;?#34892;?#22238;转?#27833;?#20986;现故障,如窜油或因磨损而泄漏等;行走马达及其阀组有故障。

                                                                                由于工作装置和回转系统工作正常,故可以?#21368;?#27893;及其挖掘机系统和主卸荷阀工作正常;在用量程为6MPa的测压表检测控?#21697;?#30340;先导油路时,无论发动机转速是高?#25925;?#20302;,先导油路的压力始终在标准值(3.0-3.2MPa)范围内,说明先导油路正常;拆下行走系统控?#21697;В?#21457;现阀芯和阀座并无磨损、卡滞现象,表明控?#21697;?#30340;工作正常;用铁块固定履带,不让其转动,然后用量程为60MPa的测压表检测行走马达的进油压力,结果压力仅为20MPa。?#23545;?#20302;于标准压力值(36MPa)。

                                                                                由此,可?#21368;细?#26426;故障的原因是:?#34892;?#22238;转?#27833;费现?#27844;漏;行走马达?#29616;?#27844;漏;行走马达安全阀失调。

                                                                                于是,用自制回转?#27833;?安上测压表)装在某一行走马达的两条主管路上,再扳动操纵杆使另一个行走马达工作,结果测压表值无变化,说明?#34892;?#22238;转?#27833;?#27491;常;再用铁块固定履带使其不能转动,用量程为60MPa的测压表装在行走马达的进油系统中并使其工作,此时系统压力为20MPa,重新调整此安全阀后,工作系统压力由原来的20MPa升至36MPa。由此可知行走马达正常,故障是由于安全阀失调引起的。

                                                                                调好此安全阀后试机时,机器行走正常、有力。

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