Shock Absorber Working Diagram
A - effort during recoil; B - force during compression
1. To determine the performance of the shock absorber, check its working diagram on the dyno.
2. 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±50°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 shock absorber.
3. The curve of the diagram should be smooth, and at the transition points (from recoil to compression stroke) without sections parallel to the zero line.
4. Evaluate the results on the chart. Recoil resistance at 47 N scale (4.8 kgf) 1 mm should be located at a distance A from the zero line, equal to: 21–28 mm for front shock absorbers, 19–26 mm for rear shock absorbers. The highest point of the compression stroke curve at the same scale should be from the zero line at a distance B equal to: 3.5–6.5 mm for the front shock absorbers; 4.5–7.5 mm - 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±50°C.
5. After checking, remove the shock absorber from the stand and, if necessary, sort out and replace damaged parts.
6. Repeat the test to make sure the shock absorber is working.