一台YZ12型压路机,在使用过程中行走系统先后出现如下故障症状:先是前进挡反应灵敏度降低、机动性能下降,此后,故障逐渐加重;再后来,前进行走无力、反应迟钝、爬坡能力明显下降。但倒挡工况时反应灵敏度、机动性能均无异常,后退行走也正常。 1.故障诊断 由于该机后退行走时工作正常,故可首先排除行走系统机械部分有故障的可能。初步判定为行走液压系统有故障。 A YZ12-type roller, the use of the walking system has the following symptoms: the first forward gear to reduce the sensitivity, maneuverability decreased, and then gradually aggravate the problem; then, walking forward weakness, unresponsive, climbing ability decreased significantly . However, when the reaction conditions under reverse reaction sensitivity, mobility are normal, back walking is also normal. 1. Troubleshooting As the machine back to normal work, it can be ruled out first of all the mechanical parts of the traveling system may be faulty. Initially judged as walking hydraulic system is faulty.