How To Maintain And Upkeep Multi-stage Pumps

Jul 25, 2025

(1) Check for any looseness in the multi-stage pump pipeline and joints. Rotate the multi-stage pump by hand to see if it is flexible.
(2) Add bearing lubricating oil into the bearing body, and observe that the oil level is at the centerline of the oil gauge. The lubricating oil should be replaced or replenished in a timely manner.
(3) Unscrew the water inlet plug of the multi-stage pump body and inject water (or slurry).
(4) Close the gate valve, outlet pressure gauge, and inlet vacuum gauge of the water outlet pipeline.
(5) Jog the motor and check if the motor direction is correct.
(6) If the multi-stage pump is not used for a long time, it is necessary to disassemble the pump completely, dry off the water, and apply grease to the rotating parts and joints before installation.

(7) Try to control the flow rate and head of the multi-stage pump within the range indicated on the label as much as possible to ensure that the multi-stage pump operates at the highest efficiency point, in order to achieve the maximum energy-saving effect.
(8) During the operation of multi-stage pumps, the bearing temperature should not exceed 35℃ of the ambient temperature, and the maximum temperature should not exceed 80℃.

(9) If any abnormal sound is found in the multi-stage pump, it should be stopped immediately to check the cause.
(10) When the multi-stage pump needs to be stopped, first close the gate valve and pressure gauge, and then stop the motor.
(11) Within the first month of operation, the multi-stage pump needs to change the lubricating oil after 100 hours, and then every 500 hours thereafter.
(12) Multi stage pumps often adjust the packing gland to ensure normal dripping inside the packing chamber (preferably dripping out).

(13) Regularly inspect the wear of the multi-stage pump shaft sleeve, and replace it promptly if there is significant wear.
(14) When using a multi-stage pump in the cold winter season, after parking, it is necessary to unscrew the drain plug at the bottom of the pump body to drain the medium completely. Prevent frost cracking.

(15) Start the motor, when the multi-stage pump is running normally, open the outlet pressure gauge and the inlet vacuum pump to see if they display the appropriate pressure, gradually open the gate valve, and check the motor load at the same time.