To check the performance of the shock absorber, its working diagram is taken on a dynamometer stand. Removal of working diagrams should be carried out according to the instructions after performing at least 5 working cycles, at the temperature of the working fluid of the shock absorber (20±5) °C, speed 60 rpm and stroke length 80 mm for the front and 100 mm for the rear shock absorbers.
The resistance of the recoil and compression stroke is determined by the largest ordinates of the corresponding diagrams. Chart Curve (pic. 123) should be smooth, and at the transition points (from recoil stroke to compression stroke) without sections parallel to the zero line.
The highest point of the recoil stroke curve at a scale of 4.8 kgf per 1 mm should be located at a distance A from the zero line, equal to 21-28 mm for the front shock absorbers, 19-26 mm for the rear. The highest point of the compression stroke curve at the same scale should be at a distance B from the zero line, equal to 3.5-6.5 mm for the front shock absorbers, 4.5-7.5 mm for the rear. After checking, remove the shock absorber from the stand and, if necessary, sort it out and replace damaged or worn parts. To make sure that the shock absorber is working, the test is repeated.