4.1.6. Check of a telescopic rack and the shock-absorber of a back suspension bracket at the stand

For definition of operability of a telescopic rack and the shock-absorber check their working charts at the dynamometer stand. Working charts remove according to the instruction attached to the stand after performance not less than 5 running cycles, at a temperature of working liquid (20±5) °C, frequency of 60 cycles in min. and length of the course of a rod (100±1) of mm.

Fig. 4.4. Working chart of a telescopic rack of a suspension bracket (shock-absorber of a back suspension bracket): I \effort at the return course; II \effort at the compression course

The curve of the chart (fig. 4.4) has to be smooth, and in a transition point (from the compression course to the return course) without sites parallel to the zero line.
Assessment of results on the chart. Resistance of the course of compression and return is determined by the greatest efforts received at removal of the chart. Control values of efforts on charts of a telescopic rack and the shock-absorber are defined at a temperature (20±5) °C.
The effort at the course of compression (zone II) has to be: for a telescopic rack (153±24) N [(15,6±2,4) kgfs], for the shock-absorber of a back suspension bracket (247±35) N [(25,2±3,6) kgfs].
The effort at the release course (zone I) has to be: for a telescopic rack (612±71) N [(62,4±7,2) kgfs], for the shock-absorber of a back suspension bracket (565±59) N [(57,6±6) kgfs].
After check remove a telescopic rack (shock-absorber) from the stand and if necessary sort it, replacing the damaged or worn-out details. After assembly repeat tests to be convinced of serviceability of a telescopic rack (shock-absorber).