When the bit is not zero fold variable displacement hydraulic axial piston pump type swash plate angle is zero is called the median hydraulic pump at a delivery rate should be zero. But sometimes deviate from the adjustment mechanism in place midpoint of the phenomenon, there is still a flow rate output at the midpoint. The reason is that the position controller deviation, loose or damaged, you need to re-zero, tighten or replace. Pump is not enough to maintain the angle of the tilt angle of the trunnion wear also have this phenomenon. Vibration and noise occur simultaneously. They not only cause harm to the operator of the machine hydraulic pump sales, but also pollute the environment. (1) mechanical vibration and noise, such as misalignment of the shaft and the motor shaft or dieback, bearing rotary shaft coupling damage pump repair damaged elastic pad and mounting bolts loose will produce noise. For high-speed operation or transmission hydraulic pump large energy distribution, to regularly check, record the amplitude, frequency, and noise of the components. As the rotational frequency and the natural frequency of the pump pressure valve are the same, it will cause the resonance, the pump speed can be changed to eliminate resonance. Liyuan hydraulic pump, hydraulic creating crystal factory direct crystal provided by the Jinan Chong Hydraulic Machinery Co., Ltd .. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead crystal create hydraulic and you hand into the brilliant, for a better future!