Common Faults and Treatment of Water Pump

To deal with faults in practice, you should analyze the actual problems according to the specific problems, follow the principle of first outside and inside, and do not operate blindly.

First of all: check the power supply situation: whether the connector is firmly connected; whether the switch contact is tight; whether the fuse is blown; whether the three-phase power supply is equal. If there is an open circuit, poor contact, blown fuse, or missing phase, the cause should be found out and repaired in time. 

Second: Check whether it is a mechanical failure of the pump itself.

1. The pump cannot be started：

Common causes: packing is too tight or the impeller and pump body are blocked by accumulation of debris; the pump shaft, bearings, and leakage reducing ring are rusted; the pump shaft is severely bent, etc.

Remedy: loosen the packing, dredge the water channel; disassemble the pump body to remove debris and rust; remove the pump shaft for correction or replace it with a new pump shaft.

2. Insufficient flow：

Causes: Most of the suction pipe leaks, the bottom valve leaks; the water inlet is blocked; the bottom valve has insufficient water depth; electric water pump speed is too low; the sealing ring or impeller is too worn; the water absorption height exceeds the standard.

Remedy: Check the suction pipe and bottom valve to block the source of air leakage; clean up the sludge or blockage at the water inlet; the water depth of the bottom valve must be greater than 1.5 times the diameter of the water inlet pipe, increase the water depth of the bottom valve; check the power supply voltage, Increase the speed of the water pump, replace the sealing ring or impeller; reduce the installation position of high pressure water pump , or replace the high-lift water pump.

3. can't suck water：

Cause: There is air in the pump body or gas in the water inlet pipe, or the bottom valve is not closed tightly, the filling water is not full, the vacuum pump packing leaks badly, and the gate valve or flapping door is not closed tightly.

Elimination method:

1. First press the water up, then fill the pump body with water, and then turn it on. At the same time, check whether the check valve is tight and whether there is any air leakage in the pipelines and joints. If air leakage is found, apply lubricating oil or mixed paint to the joints after disassembly, and tighten the screws.

2. Check the oil seal ring of the water pump shaft, and replace it with a new one if it is severely worn.

3. Water or air leakage in the pipeline. The nut may not be tightened tightly during installation. If the leakage is not serious, apply cement or cement slurry mixed with asphalt oil on the leaking or water leaking place. Temporary repairs can be coated with wet mud or soft soap. If there is water leakage at the joint, you can use a wrench to tighten the nut. If the water leakage is serious, you must re-disassemble and replace the cracked pipe; reduce the head and press the nozzle of the pump into the water 0.5m.

4. the pump does not produce water：

Causes: marine pump body and the suction pipe are not filled with water; the moving water level is lower than the filter pipe of the pump; the suction pipe is broken, etc.

Remedy: Troubleshoot the bottom valve and fill the water diversion; lower the installation position of the water pump so that the filter pipe is below the dynamic water level, or wait for the dynamic water level to rise, and then pump the filtered water pipe; repair or replace the suction pipe.

5. the pump body vibrates violently or produces noise：

Causes: water pump dc is not installed firmly or the water pump is installed too high; the ball bearing of the motor is damaged; the main shaft of the water pump is bent or is not concentric or parallel with the main shaft of the motor.

Treatment method: install rv water pump stably or lower the installation height of the water pump; replace the motor ball bearing; correct the bent water pump main shaft or adjust the relative position of self priming water pump and the motor.

6. excessive power consumption：

Causes: the speed of the water pump is too high; the main shaft of the water pump is bent or the main shaft of the water pump is not concentric or parallel to the main shaft of the motor; the pump lift is not suitable; the water pump sucks in sand or clogging; the ball bearing of the motor is damaged.

Treatment method: check the circuit voltage and reduce the speed of the water pump; correct the main shaft of the water pump or adjust the relative position of the water pump and the motor; select a water pump with a suitable head; clean up the sand or blockage; replace the ball bearing of the motor.

7. the drive shaft or motor bearing is overheated：

Causes: lack of lubricating oil or broken bearings, etc.

Treatment method: add lubricating oil or replace the bearing.

These are the common causes of the "sickness" of the water pump, not all of them. In practice, the failure is dealt with, and the actual analysis should be based on the specific problem. The principle of first outside and inside should be followed. Do not operate blindly.