Perfezionamento e collaudo del motore idraulico TH68.This master’s degree thesis is performed in collaboration with Bonfiglioli group, in a more specific way, with the Hydraulic Motors department. The target of the work is to obtain a method to estimate the wear of a hydraulic motor thus compute its lifetime. The motor considered is a new generation axial piston swashplate motor, it is designed with a feedback control system for varying the displacement according to the input signal that the operator applies, trough the joystick, for the specific operation that is going to perform. This kind of device is used in the track drives dedicated to construction machinery which can provides an output torque of up to 17,000 Nm, designed for a continuous pressure of 450 bar, a maximum oil flow of 160 l/min and it can go beyond the 2: 1 displacement ratio that is normally seen as a limiting factor.