Checking on Shock Tester
Shock absorber, checking on shock tester
The shock tester allows shock absorbers to be tested without removing them from the vehicle. The damping effect can be assessed on the basis of the pointer deflection or print-out.
Special tools, testers and auxiliary items required
^ Boge shock tester or
^ Sachs shock tester V.A.G 1975 or
^ Maha shock absorber tester VAS 1990
Note:
^ Temperature +10° to +40°C
^ Diver in vehicle.
^ Tire inflation pressure OK
^ Wheels of the vehicle have been placed in a central and straight position on the tire contact plates.
^ Front wheels in straight-ahead position.
^ Parking brake not applied, brake pedal not depressed.
Test results
The condition of the shock absorbers can only be evaluated as follows:
^ Satisfactory damping effect
or
^ Unsatisfactory damping effect
Note:
^ Intermediate readings for reduced damping performance are not possible.
^ Service life forecasts are not permitted.
^ Measured values which include the influence of the spring travel end stops will be biased.
The following values only apply to tests conducted on the test equipment listed above. If the maximum values listed below are exceeded, the effectiveness of the shock absorber has deteriorated significantly and replacement is recommended.
Example:
Maximum value = 70
^ a = greater than 70: unsatisfactory damping effect
^ a = less than 70: satisfactory damping effect
The shock absorber combination installed in the vehicle is indicated by the corresponding PR number on vehicle data sticker.
Explanatory notes on weight codes Production Relevant numbers (PR Nos.)
Maximum values "a" in mm
Note:
^ If the reading is higher than the maximum value "a" listed in the table, damping effect is unsatisfactory, replace shock absorber.
^ If the reading is lower than the maximum value "a" listed in the table, damping effect is satisfactory, shock absorber does not have to be replaced.
Vehicles up to vehicle identification number 400 000
Vehicles from vehicle identification number 400 001 onwards
