FIELD: diagnosis of transport facilities, in particular, means of diagnosis of units providing for traffic safety, applicable in operation of transport facilities, and in instrument engineering. SUBSTANCE: for determining the angular position of the steering wheel rim in the process of diagnosis use is made of a transparent hydraulic element, which may be made in the form of a torus or ampoule filled with liquid. The hydraulic element with a scale is positioned on a disk freely connected to the dynamometer casing. As a result, the backlash gauge is arranged with the dynamometer in a single structural unit having a single setting point at diagnosis. Enhanced accuracy of measurement of steering wheel backlash is ensured due to arrangement of the scale on disk with a larger radius than the disk radius, as well as due to the use of a scale with oppositely positioned zero marks. EFFECT: enhanced convenience in use, enhanced accuracy of measurement of steering wheel backlash, reduced labour content of diagnosis. 2 cl, 6 dwg
