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一台上海-50型拖拉机,在耕地作业中液压提升间断失灵。当提升失灵时,必须加大油门提高转速才能使农具勉强升离地面,但是转速稍有降低,农具就自动落下。起初认为分配泵有问题,经拆卸检查,发现主控制阀没有卡滞现象。又认为升降操纵机构有问题,拆下后重新调整了里外拨叉,装复后试车,仍不正常。后来拆下后桥壳侧盖板,在液压系统运转状况下,把里手柄搬到工作位置(带农具),听到安全阀有轻
A Shanghai -50 tractor, hydraulic lifting intermittent failure in the arable land operations. When upgrading fails, you must increase the throttle to raise the speed to make farm tools barely lift off the ground, but the speed slightly lower, farm tools automatically fall. Initially that there is a problem dispensing pump, demolition inspection found no main control valve stuck phenomenon. Also think that there are problems with the lifting control mechanism, after removing the re-adjust the fork inside and outside, after the trial installed, is still not normal. Later, after removing the rear axle shell side cover, in the hydraulic system operating conditions, the handle to move to the working position (with farm tools), I heard a safety valve light