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我公司的一台Ｔ１４０－ｌ型推土机最近出现了主离合器操纵费力现象。检查主离合器油尺，发现泊位过低，加油后操纵立刻省力了，但工作一段时间后又出现了相同故障。 造成主离合器操纵费力的原因有：主离合器调整环调整不当；主离合器液压系统压力太低。根据以上现象，确定故障
A T140-l bulldozer from our company recently experienced laborious handling of the main clutch. Check the main clutch oil dipstick and found berths too low, fuel immediately after the manipulation of labor-saving, but after working for some time and the same failure occurred. The main clutch operation caused by laborious reasons: the main clutch adjustment ring improper adjustment; the main clutch hydraulic system pressure is too low. According to the above phenomenon, determine the fault