一次,我部在进行车场日时,发现一台东风EQ240牵引车发动后,电流表指示充电,声音也正常,可没过两分钟,发动机声音突变,出现严重“突突”声,且消声器“放炮”。将电源总开关关闭,现象消失,开启,现象又出现。停车检查,断电器白金触点严重烧蚀,断电臂变色,变质,钢片失去弹力,更换一组白金,开始工作正常,过了一两分钟,故障又复出现。再换一 Once, my department at the yard day and found a Dongfeng EQ240 tractor after the launch, the ammeter indicates charging, the sound is normal, no less than two minutes, the engine suddenly mutated, a serious “bump” sound, and muffler “shot” . Turn off the main power switch, the phenomenon disappears, open, the phenomenon appears again. Parking inspection, severely ablated platinum contacts on power off, discoloration, deterioration of steel arm, loss of elasticity of steel, replacement of a group of platinum, began to work properly, after a minute or two, the fault reappears. Another change