Insufficient flow

No water

1. Inhalation side or outlet side or impeller with debris blockage

2. Overwear of sealing ring or damage of impeller

3. Steering discrepancy

4. Too low speed

5. Air inhalation

6. Installation head is too high

7. The pump is not filled with conveying liquid.

1. Clean up blockages in filter, suction port, impeller, guide vane and discharge valve system.

2. Replacement of damaged parts

3. Correction steering

4. Measure voltage and frequency, check motor

5. Exhaust the gas in the inhalation pipe and check the inhalation pipe

6. Reduce system resistance and adjust operating conditions

7. Inspection of Inhalation Pipeline System

Unable to start

1. Faults of motor or power supply system

2. Foreign bodies in rotor components

3. Bearings are stuck

4. Starting conditions are not satisfied

1. Maintenance of motor or power supply system

2. Cleaning rotor components

3. Cleaning or replacing bearings

4. Conditions to be met for inspection

Overload

1. Bearing damage

2. Foreign body in pump

3. Friction between impeller and seal ring

4. Over-compacted packing

5. Excessive speed

6. Pump running beyond allowable operating range under large flow rate

7. One-phase circuit break of power supply line and single-phase operation of motor

1. Replacement of bearings

2. Removal of foreign bodies

3. Repair or replace impellers or sealing rings

4. Relax packing

5. Check voltage, frequency, motor and adjust them.

6. Close the outlet gate valve

7. Maintenance of power supply lines

Abnormal vibration and noise

1. Cavitation of pump

2. Excessive unbalanced weight of impeller

3. Pump and motor axles are not centrifugal or axle bending

4. Foot bolt loosening

5. Bearing damage

6. Excessive wear of guide bearings and bushes

7. The influence of discharge pipeline

1. Increase the suction level or close the outlet gate valve

2. Impeller rebalancing

3. Concentricity of correction axis, alignment axis

4. Tighten the anchor bolts

5. Replacement of bearings

6. Replacement of guide bearings and bushes

7. Check the discharge line

Bearing heating

1. Poor assembly and excessive eccentricity of axle center

2. Bearing damage

3. Less or less oil in bearings

1. Check the radial runout and correct it.

2. Replacement of bearings

3. Supplementary lubricants