Maintenance Of Self-Priming Pumps

Check the self-priming pump, piping, and connections for any looseness. Rotate the pump by hand to ensure it turns freely.
Add lubricating oil to the bearing housing, ensuring the level aligns with the centerline of the oil gauge; replenish or replace the oil as needed.
Unscrew the priming plug on the pump body and fill the pump with priming liquid (or slurry).
Close the discharge gate valve and shut off the valves to the discharge pressure gauge and suction vacuum gauge.
Jog the motor briefly to verify the correct direction of rotation.
Start the motor. Once the pump is running normally, open the valves to the discharge pressure gauge and suction vacuum gauge. After observing appropriate pressure readings, gradually open the gate valve while monitoring the motor load.
Maintain the pump's flow rate and head within the ranges specified on the nameplate to ensure operation at peak efficiency and maximize energy savings.
During operation, the bearing temperature rise should not exceed 35°C above ambient temperature, and the absolute temperature must not exceed 80°C.
If any abnormal noise is detected, stop the pump immediately to investigate the cause.
To shut down the pump, first close the gate valve and the pressure gauge valve, then stop the motor.
Change the lubricating oil after the first 100 hours of operation, and subsequently every 500 hours.
Regularly adjust the packing gland to ensure proper leakage from the stuffing box (ideally, a steady drip).
Periodically inspect the shaft sleeve for wear and replace it promptly if significant wear is found.
When operating in cold winter weather, unscrew the drain plug at the bottom of the pump body after shutdown to completely drain the fluid and prevent freeze damage.
For long-term storage, disassemble the pump completely, wipe away all moisture, apply grease to rotating parts and mating surfaces, reassemble, and store properly.