Common faults and their causes of gear pumps (two)     

3, the establishment of pressure or pressure is not enough

Most of this phenomenon is related to the cleanliness of hydraulic oil, such as the incorrect selection of oil or the cleanliness of the use of oil can not meet the standard requirements, will accelerate the wear of the pump, resulting in internal leakage. Therefore, should use mineral hydraulic oils containing additives, which can prevent oil oxidation and bubbles. Oil viscosity standard (16~80 x10-6m2/s). Filtering accuracy: the input circuit is less than 60 m and return oil for 10~25 M. Through the sleeve and the side plate to observe the failure of gear pump, if the oil cleanliness is poor, will lead to obvious groove friction surface, and the gear pump normal wear of the sealing surface can only produce a uniform surface.

4, the flow can not reach the standard

(1) the oil inlet filter is too dirty and oil absorption is insufficient.

(2) self suction pump mounting height is higher than the height of the pump.

(3) the gear pump suction pipe to suction caused by excessive resistance. The maximum oil absorption velocity is 0.5~1.5m/s.

(4) the oil inlet joint of gas leakage caused by pumping oil shortage. By observing the mailbox if bubbles can determine whether the system leak.