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某机手用一台工农-3型手扶拖拉机秋耕时,发现功率越来越小,最后减轻负荷也不能正常工作,且机体过热,连进气管也烫手。检查发现,供油时间过晚,把喷油泵下的调整垫片全都抽出,供油时间仍为0°左右。怀疑是柱塞副、油泵滚轮和凸轮轴过度磨损,于是将其全部换新件,装复检查供油提前角,仍在0°～5°。后进一步仔细检查,发现当盘动飞轮时,喷油泵出油口油面有倒吸现象,检查出油阀紧座处不漏油,拆下出油阀,发现出油阀副严重磨损,阀芯锥面上磨出深约0.5毫米的沟槽,导致高压油管内柴油回漏严重,剩余压力降低,从而造成供油时间始终过晚,无法调整。更换新出油阀后,供油提前角即达到18°,故障彻底排除。
When a tractor hands a tractor with worker-peasant-ad-type 3 autumn plowing, he finds that the power is getting smaller and smaller, and finally, the load can not be reduced to normal work, and the body is overheated, even the air intake pipe is also hot. Inspection found that the fuel supply time is too late, the fuel pump under the adjustment shims are all out, the fuel supply time is still 0 ° or so. Suspected to be deputy, pump roller and camshaft excessive wear and tear, so it will be all new pieces, loaded check the fuel supply advance angle, still 0 ° ~ 5 °. After a closer examination and found that when the disk drive flywheel, the fuel pump oil sucker face upside down phenomenon, check the oil valve seat is not tight, remove the oil valve and found the valve serious wear and tear, the valve The core conical surface grinding groove about 0.5 mm deep, resulting in high-pressure fuel pipe serious back leakage of diesel, reducing the remaining pressure, resulting in fuel supply time is always too late to adjust. Replacement of the new oil valve, the oil advance angle that reached 18 °, the failure completely ruled out.