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Introduction. Issues on the functional unification of the adaptive hydraulic  drive  module  are  studied.  For  the  first  time,  self-adapting   mechanisms   are   considered   taking   into   account adaptive intercommunication of the load control and agreement of motions on the working body of the mobile machines. The work objective is to create and analyze the technique of the functional unification of the adaptive hydraulic drive module. In the furtherance of this goal, a number of tasks are solved. The selection of technical equipment – unified adaptive hydraulic drive  modules  of  the  mobile  machines  –  is  validated.  The methodology   and    indicators   of    the    module    functional unification are described. Intercommunications are considered: direct  positive  and  back  negative  ones.  Their  effect  on  the functional unification property of the adaptive module is shown. Materials and Methods. For the synthesis and analysis of the functional  unification  indicators  of  the  adaptive  module,  a similarity method of the technical systems operation is adopted. Research     Results.     Techniques     for     structural-functional unification   of   the   self-adapting   modules   are   developed. Optional  versions  of  the  unified  modules  modification  and proper combinations of hydraulic motors, regulating equipment, and  mathematical  models  of  adaptive  communications  are presented. Criteria  and  indicators  of similarity are  proposed. The functional unification of the adaptive intercommunications of the module and different types of the hydraulic motors and fluid throttling elements in the hydraulic system are analyzed. Recommendations for implementing the functional unification under typing and operation (adjustment) of the adaptive module are formulated. Discussion and Conclusions. The methodology is recommended for the functional unification of the hydraulic self-adapting module. It can be used for the development of unit sizes and under its operation as an independent drive or a hydraulic drive subsystem of a multifunctional or combined machine.