五山-2000A型橡胶履带自走式联合收割机所配备的变速箱系工农-12型手扶拖拉机变速箱稍加改制而成,即在原变速箱的基础上外加一副蹄式制动器。2002年麦收期间,我们这里有两台该型收割机出现过变速箱打齿故障。故障征象是机组突然停止不前,有时伴有发动机冒黑烟后熄火现象。机手还以为是自动脱挡,再次尝试挂挡时,有时能听到崩齿的声音,导致损坏程度增加;倒挡时,有时机组能后退。经三包人员现场拆卸,发现两台机车都是因两侧制动器106轴承损坏,并咬死转向轴,造成变速箱中央传动 Wushan -2000A rubber crawler self-propelled combine harvester equipped with gearbox is the worker-peasant-12 walking tractor gearbox slightly modified from the original gearbox plus a pair of shoe brake. During the 2002 wheat harvest, we had two such harvesters that had gearboxed teething faults. Symptoms of failure is a sudden halt of the crew, sometimes accompanied by black smoke engine flameout. The driver also thought it was automatically off the block, try to hang up again, sometimes you can hear the teeth of the teeth, resulting in increased damage; reverse gear, and sometimes the crew can back. After the three packs of staff on-site disassembly and found that both locomotives are damaged due to the bearing 106 on both sides of the brake, and killed the steering shaft, resulting in transmission central transmission