For computer control of the link movements in a mini excavator, the original pilot stage has to be modified. In our previous work (Peussa et al., 1995), switching on/off valves were used in the pilot stage, as an interface between the main valve and electronics. It was investigated that Differential Pulse Width Modulation (DPWM) can be used to generate the required pilot pressure. Modeling and identification of the proposed DPWM operated pilot stage is studied in this paper. Both parametric and non-parametric approaches are employed for identification. An estimated linear model is obtained for the new pilot system and its validity is checked via various tests. According to the results, the modified pilot stage has linear dynamics and is quite reliable.