In cases where the combination of both positive and negative loads are not possible, the following procedure should be applied. The loading principle is shown in the following picture.


Loading principle for axial reduction measurement

The first measurement should be performed when the equipment is put into operation in order to obtain a base value for subsequent repeat measurements.

Mark the respective measuring positions on the circumference while keeping the boom in a specified position.

The measurement is performed between the lower mating structure and the bearing bolted to the superstructure:


Three-row roller bearing slewing ring - basic test setup for axial reduction measurement

Record the base values obtained in tabular form and allocate them to the respective base measurements:



The axial reduction measurement should be repeated every twelve months as a minimum, under identical conditions.

In case of heavy wear the time intervals between measurements should be shortened.

If the deviation from the base measurement exceeds the maximum values, please consult Rothe Erde.