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Fault Repair Of Hydraulic Pump

     Find the cause of the failure from the following three points during maintenance and improve the system: check the internal leakage of the boom cylinder. The easiest way to do this is to raise the arm to see if there is a noticeable drop in freedom. If the whereabouts are clear, remove the cylinder check and the seal ring should be replaced if worn. Hydraulic Pump

    Check the control valve. First cleaning safety valve, check whether the valve core wear, such as wear should be replaced. If the safety valve is not changed after installation, then check the control valve spool wear condition, its clearance use limit is generally 0.06mm, wear seriously should be replaced. Measure the pressure of the hydraulic pump. If the pressure is low, then the adjustment, add pressure is still not up, then the hydraulic pump serious wear.Hydraulic Pump

    The selection of hydraulic components is unreasonable. Dynamic ARM cylinder specifications for 70/40 non-standard series, seals are not standard parts, high manufacturing costs and inconvenience of sealing parts replacement. The cylinder diameter of the movable arm oil cylinder is small, which will make the system adjust the pressure high. The hydraulic pump is badly worn. In the low-speed operation of the pump leakage is serious Hydraulic Pump

     High speed operation, pump pressure slightly increased, but because of the pump wear and leakage, volume efficiency significantly reduced, difficult to achieve the rated pressure. Long-time hydraulic pump work and increased wear, oil temperature rise, resulting in hydraulic components wear and sealing parts of aging, damage, loss of sealing capacity, hydraulic oil deterioration, and finally lead to failure.Hydraulic Pump

    Improve the design of hydraulic system. After many arguments, the final use of advanced priority valve and load sensing hydraulic steering gear, see fig. 2. The new system is able to follow the steering requirements priority to its distribution of traffic, regardless of the load size, steering wheel speed can ensure adequate supply of oil, the rest can be fully supplied with the working device circuit, thus eliminating the steering circuit due to excessive oil and power loss, improve the system efficiency, reduce the pressure pump work.Hydraulic Pump