故障现象 ■一辆日野KB212汽车在行驶中,当变速器换入三挡时,常出现跳挡现象,道路不平或重载上坡时跳挡现象更加明显,有时只得靠手按住变速杆才能保证不跳挡。 故障分析与排除 因为跳挡故障出现在变速器的第三挡上,所以只需对变速器三挡的有关部件进行检查。经检查,自锁装置,三挡换挡拨叉、拨叉轴、三挡齿轮均正常。为消除疑虑,更换了部分怀疑有问题的零件,但故障依然没有得到彻底排除。 最后,在仔细检查输出轴上的三挡齿轮时,发现该齿轮 Symptoms ■ a Hino KB212 car is driving, when the transmission into the third gear, often appear jump block phenomenon, uneven road or heavy load uphill when the phenomenon is more obvious, sometimes only have to press and hold the gear lever to ensure that not Jump block. Fault Analysis and Troubleshooting Because the skip fault occurs on the third gear of the transmission, only the relevant parts of the third gear of the transmission need to be checked. After inspection, self-locking device, third gear shift fork, fork shaft, third gear are normal. In order to eliminate the doubt, some parts that are suspected to be in trouble have been replaced, but the malfunction has not been completely ruled out. Finally, the gear was found when carefully examining the third gear on the output shaft