Crank and rod mechanisms are frequently used in compressors and pumps. The oscillation of masses and forces in crank and rod mechanisms causes them to be the source of vibrations. Due to load changes in the motor, internal bearing clearance can lead to, for example, knocks with high-frequency excitation spectra. In addition, free mass forces generate vibrations with harmonics due to non-linear kinematics. With the PT 500.16 kit, the stroke, mass compensation and bearing clearance on the crosshead can be adjusted.