Cause: (10) hydraulic oil is too dirty. Remedy: cleaning systems, replacement of hydraulic oil. Cause: (11) pump filter is not blocked from the oil filter dirt effect Remedy: wash with clean oil filter to remove dirt. Cause: (12) hydraulic motors sold oil shortage, oil position is too high, the oil suction pipe is exposed: Remedy: Come to the oil standard position, reduce the suction position. Cause: (13) on both sides of the pump body and pump cover is not cardboard pad; pump and pump cover is not perpendicular to the seal: 2. The characteristics of the hydraulic pump (1) having a plurality of sealing the space and because changes periodically. And the volume change amount of frequency change per unit of time and the pump output flow is proportional to the space within, regardless of other factors. (2) the absolute pressure of the liquid in the tank must be identically equal to or greater than the atmospheric pressure. This is a positive displacement pump oil can be inhaled external conditions. So as to ensure normal suction pump, tank must be vented to the atmosphere of the hydraulic motor, or the use of sealed sub tank filling. (3) have a corresponding assignment mechanism. The suction tank and discharge tank separated from the hydraulic motor maintenance, to ensure a regular continuous pump suction liquid. When the suction valve 5 is closed and 6 open; when the oil pressure, the valve 5 open, 6 closed. Sales of hydraulic motors | hydraulic motors | hydraulic factory direct crystal hit by the Jinan Jing Chong Hydraulic Machinery Limited. 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!