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Serial Number Fault Phenomenon Cause Solution 1. Motor fails to start (1) No power supply (2) One or two phases of the power supply are disconnected (1) Check the power supply status (2) Check whether fuses and contacts are in good condition 2. Insufficient or no liquid discharge (1) Suction pipe is blocked or the valve in the suction line is not open (2) Air leakage in the suction line (3) Suction pipe is too long with many sharp bends (4) Damage to the valve surfaces of the suction or discharge valve, or foreign objects getting stuck there, resulting in poor sealing (5) Air remaining in the diaphragm chamber (6) Air or oil leakage from the oil replenishment valve assembly or diaphragm chamber (7) Abnormal operation of the safety valve or compensating valve (8) Impurities in the oil of the oil replenishment system; valves are damaged, leading to poor sealing (9) Severe leakage at the piston packing (10) Insufficient or unstable motor speed (11) Liquid level in the suction tank is too low (1) Check the suction pipe and filter; open the valve (2) Seal the areas where air is leaking (3) Thicken the suction pipe to reduce sharp bends (4) Check the sealing performance of the valves; replace the valves and seat if necessary (5) Refill with oil and remove air (6) Locate and seal the leakage points (7) Adjust again (8) Use clean oil (9) Adjust the packing gland or replace it with new packing (10) Stabilize the motor speed (11) Adjust the liquid level in the suction tank 3. Pump pressure does not meet performance specifications (1) Damage to the suction and discharge valves (2) Severe leakage at the piston packing (3) Poor sealing at the diaphragm or discharge pipe connections (1) Replace with new valves (2) Adjust the packing gland or replace it with new packing (3) Locate and seal the areas where air is leaking 4. Reduced measurement accuracy (1) Same as items (4)-(11) in serial number 2 (2) Piston zero point is offset (1) Same as items (4)-(11) in serial number 2 (2) Re-adjust the piston zero point 5. Parts overheat (1) Excessive or insufficient oil in the transmission mechanism’s oil tank; oil contains impurities (2) Poor lubrication of moving parts (3) Packing is tightened too much (1) Replace with fresh oil and adjust the oil level appropriately (2) Check and clean all oil holes (3) Adjust the packing gland 6. Shocking noises inside the pump (1) Severe wear of moving parts (2) Valve stroke is too high (1) Adjust or replace the parts (2) Adjust the stroke height to avoid valve lag