We are offering calzoni hydraulic motors. Features: 1.static pressure balance structure between shaft joint and connecting rod,thereby,it well smoothes the fiction joint and releases shaft pressure. 2.because of the decrease of the fictional work and heat loss,mechanical and starting efficiency increase,and hence the work pressure of motor also improves. 3.the shaft of this series employs fission structure to prolong motor life. 4.all the key parts of this series of motors use special material and employ special heat treatment,therefore,it efficiently prolong motor life.