Record working diagrams according to the instructions attached to the stand, after performing at least 5 working cycles, at a shock absorber working fluid temperature of 20±5°C, a flywheel speed of 60 min-1 and a stroke length of 80 mm for the front shock absorber and 100 mm for the rear.
Chart Curve (pic. 4-19) should be smooth, and at the transition points (from recoil to compression stroke) - without sections parallel to the zero line.
Pic. 4-19. Shock absorber working diagram: I - effort during recoil; II - force during the compression stroke
Evaluation of results according to the diagram
The resistance of the recoil and compression stroke is determined by the largest ordinates of the corresponding diagrams.
The highest point of the recoil curve at a scale of 47 N (4.8 kgf) 1 mm should be located at a distance A from the zero line, equal to: 25-32 mm for front shock absorbers, 23.5-30.5 mm for rear shock absorbers.
The highest point of the compression stroke curve with 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 for the rear.
The control values of the ordinates on the diagrams of the front and rear shock absorbers are set for cold shock absorbers at a shock absorber fluid temperature of 20±5°C.
After checking, remove the shock absorber from the stand, if necessary, sort and replace the damaged parts.
Repeat the test to make sure the shock absorber is working.