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拖拉机液压齿轮泵工作能力下降,是指供油压力不足或不供油。其主要原因有:1.油箱缺油、油液过稀或动力未接合。2.进油管漏气和油泵内漏增加。进油管漏气主要是进油管接头松动或进油管路破裂;油泵自紧油封密封不良,当油泵吸人空气后会出现油液乳化,并从油箱加油口处大量溢出而引起的。油泵内漏主要由以下原因引起:零件磨损严重,壳体和齿顶磨损使齿轮的径向间隙增大;轴套端面严重磨损,使卸压片密封圈预压缩力不足,齿端间隙增大;卸压片密封圈老化或损坏,压油腔的压力油漏回吸油腔形成内循环,不能形成高压;油泵装配上的错误,如轴套的安装位置和偏转方向不正确,卸压片和密封圈错装在压油
Tractor hydraulic gear pump capacity decline, refers to the lack of oil supply pressure or not. The main reasons are: 1. The tank is lack of oil, the oil is too thin or the power is not engaged. 2. Inlet leakage and pump leakage increase. Mainly into the leakage of oil into the pipe joints loose or into the pipeline rupture; oil tight seal from the tight seal, when the oil pump suction air will appear after the oil emulsion, and from the tank filling a large number of overflow caused. Oil pump leakage is mainly caused by the following reasons: parts wear serious shell and tooth top wear gear so that the radial gap increases; serious wear sleeve end face, the pressure relief piece preload force less than the seal, the tooth end gap increases ; Pressure relief seal ring aging or damage, pressure oil pressure chamber leakage back into the oil absorption chamber formation of internal circulation, can not form a high pressure; pump assembly errors, such as sleeve installation position and deflection direction is not correct, unloading tablets and Wrong seal installed in the pressure oil