A circuit of the front-end loader hydraulic drive has been developed and it is based on a counterbalance valve, which provides load fixation in a certain position, proportional speed control and energy saving due to the load lowering under its own weight. Mathematical models of the loader boom hydraulic drive has been elaborated and the solutions have been obtained in MATLAB Simulink environment. The mathematical model takes into account pressure losses of the counterbalance valve, the results of computer simulation of the loader boom inertia moment and hydrodynamic force at the main spool of the counter-balance valve, calculated using Autodesk software product. Optimization criterion has been developed and optimal design parameters are found.
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