Taking the auto speed variator of AVELING dumper as an example, the paper introduces the basic check, analysis and fault diagnosis methods which are widely adopted in the hydraulic auto speed variator in engineering mechanical driving system.

• 以AVELING自卸车的自动变速器为例，介绍工程机械传动系中广泛采用的液力自动变速器基本的检测、分析与故障诊断方法。