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Researches show that hydraulic shock provokes premature destruction of hydraulic drive high-pressure hoses and unauthorized emission of working fluid into the atmosphere, resulting in environmental pollution. There are ways to protect the machines hydraulic transmission based on the principle of automatic disconnection from the working fluid supply at the hoses damage. However, well known protecting methods do not solve the mentioned problem completely as the hydrodynamic alternating loads caused by hydraulic impact at operation activating when the closing device of the hydraulic drive protecting system do not only destroy the hoses, but also lead to oscillatory process of the locking device shutter, decrease in speed of locking device operation, increase in closing time of the damaged hydraulic line and consequentially increase in a working liquid losses at a high pressure hoses destruction. To eliminate the above-mentioned deficiencies, theoretical and experimental research of the devices parametric characteristics was carried out and a new technical solution was developed which provides increase of closing device functional use while the cotemporaneous design simplifying.