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Pump a variety of causes of failure: First, the pump output pipe resistance large Exclusion: 1 output pipe layout is correct, the pipe diameter can not be small, the pipe corner is too much 2 check the valve is flexible 3 appropriate to open the outlet valve until Operating conditions Second, oil, water, more gas Exclusion: 4 oil in the water, air bubbles in the control of about 100 ℃ -120 ℃ temperature, slowly exhausted, can be gradually warmed to the point of 5 pipeline layout is whether Reasonable 6 Install the exhaust valve Third, the pipe and impeller flow blockage Exclusion method: 7 Clear the debris inside the pipe and the impeller flow path 8 Check the valve gate valve failure Fourth, the import filter clogging troubleshooting: 9 regular cleaning filter 10 filter Mesh number can not be too close five, the pump inlet sealing ring and impeller sealing ring serious wear and tear Removal method: 11 replacement of wear parts 12 pump suction diameter is less than or equal to 100mm, the mouth ring gap greater than 1.5mm should be replaced; inhalation Diameter greater than or equal to 125mm, the mouth ring gap greater than 2mm, should be repaired Replacement Sixth, speed and steering is not correct Remedy: 13 Check the speed value (measured with a tachometer) 14 seized Line connection 15 Whether the reverse operation Seven, the viscosity of the transmission fluid Viscosity deviation from the basic value Exclusion method: 16 When the media deviation from the ordering parameters and failure should be inquired to the factory Eight, the device NPSH S is too low Low) Remedy: 17 Check the tank level adjustment if necessary 18 Pump inlet valve fully open, and check the filter 19 When the high slot to the pump inlet pipe resistance is too large,