1.故障现象一台长江牌QY16T型汽车起重机的起重臂杆由基本臂和2节伸缩臂组成,起重臂杆的伸缩动作正常,但将2节伸缩臂伸到头开始缩臂时,全机开始抖动,压力表摆动很大,特别是臂杆缩到前半段之前抖动得厉害,此后逐渐减轻。当变幅角度小于45°时,几乎没有抖动,后随着变幅角度的增加,抖动又会开始。 1. Symptoms A crane QY16T truck crane boom from the basic arm and two telescopic boom components, telescopic boom boom normal, but will be two telescopic boom to the beginning of the telescopic boom, the whole Machine began to shake, pressure gauge swing great, especially before the boom shrank the first half of the shaking very powerful, then gradually reduced. When the amplitude angle is less than 45 °, almost no jitter, with the increase of amplitude angle, the jitter will start.