Reasons and troubleshooting methods for water pump failure:
The reason why the pump unit does not produce water after starting:
The reason why the water pump does not produce water is that there is air inside the pump or air accumulation in the inlet pipe, or the bottom valve is not tightly closed and the water supply is not sufficient, or the vacuum pump packing is severely leaking, and the gate valve or flap valve is not tightly closed.
The elimination method for water pump failure: remove debris, replace damaged rubber pads, and change the direction of valve plates; Tighten or replace the packing, close the gate valve or tap the door; Increase the injection volume until there is no bubbling at the vent plug; Replace pipes with cracks; Reduce the head and press the pipe mouth of the water pump into the water for 0.5 meters.
The reason why the water pump does not produce water is 2. The pump does not rotate when starting: the packing is too tight or the impeller and pump body are blocked by debris, or the pump shaft, bearings, and leak reducing ring are rusted, or the pump shaft is severely bent.
The elimination method for water pump failure: loosen the packing and unclog the drainage channel; Disassemble the pump body to remove debris and rust; Remove the pump shaft for calibration or replace it with a new pump shaft.
Reason 3 for the water pump not producing water: Damage to the heating bearing of the water pump: The clearance between the rolling bearing or the bracket cover is too small; The pump shaft is bent or the two shafts are not concentric; The tape is too tight; Lack of oil or poor oil quality; The balance hole on the impeller is blocked, causing the impeller to lose balance and increase the thrust to one side.
The elimination method for water pump failure: replace the bearing; Remove the back cover and install a gasket between the bracket and the bearing seat; Adjust the pump shaft or adjust the concentricity of the two shafts; Adjust the tightness of the tape appropriately; Add clean butter, which accounts for 60% of the clearance inside the bearing; Clear the blockage in the balance hole.
Reason 4 for the water pump not producing water: Insufficient flow after starting: mismatched speed or belt slippage, resulting in low speed; The installation angle of the axial flow pump blades is too small; Insufficient head; High suction range; Partial blockage or damage of the bottom valve, pipeline, and impeller; The water outlet pipe is leaking severely.
The elimination method for the water pump not producing water: restore the rated speed, remove the oil stains on the belt, and adjust the belt tightness; Adjust the blade angle and lower the installation position of the water pump; Seal the leakage point of the water pump and tighten the packing; Remove blockages and replace impellers; Replace the leak reducing ring and block the leaking area.