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The torque limiter shall cause rotation between driving shaft and driven one by slipping of clutch plates in case that torque more than rated is imposed. Such rotation shall cause hydraulic pump incorporated in the torque limiter to start and pressed oil shall be supplied to the piston chamber which pushes clutch plates. As a result, pressure in the piston chamber shall be increased rapidly so as to open the relief valve.
Thus clutch operating oil in the piston chamber shall be returned into the casing, and as oil pressure of the clutch plates is lost, the torque limiter shall be kept shut off. Therefore the torque limiter is suitable for overload break of auger and blower of a rotary snow plow.