Common problems and solutions for cleaning suction trucks

1、 Why can't the high-pressure pump generate pressure?

1. Check if the pipeline between the water outlet and the high-pressure pump is blocked, causing insufficient water supply.

2. Check for garbage in the filter and clean the filter.

3. Observe whether the pump body and high-pressure pipe are shaking. If there is shaking, it indicates that there is air in the pipeline. It is necessary to open the high-pressure three-way valve of the high-pressure pump without installing a nozzle, and then add the throttle to discharge the air in the pipeline until the high-pressure pipe flows normally.

4. The pressure and pump body can operate normally. If the pressure gauge does not move, it needs to be replaced to prevent overpressure use (each high-pressure pump is set with a maximum pressure value, and overpressure use can cause leakage of the high-pressure pump relief valve and safety valve. If such a situation occurs, please contact the manufacturer).

5. Check if the high-pressure three-way valve is broken and not tightly closed, causing water flow divergence and affecting pressure.

6. After checking all the above situations, it is still unable to generate pressure. Based on the service life of the pump body and water quality issues, it is speculated that there may be scratches on the plunger pump inside the pump body.

2： Why is the suction force of the sewage pump not as strong as when it was first used?

1. Firstly, self check: Close all ball valves and back covers to hold pressure and check if the pressure values are within the normal range (negative pressure of oil pump: 0.06 value, water circulation pump: 0.06-0.1 value)

2. Check if there are any blockages in the filter screen of the air inlet and if it needs to be cleaned.

3. Check whether all ball valves, filling ports, and back covers are tightly closed and whether there is any air leakage.

4. Is the anti overflow valve inside the tank stuck at the inlet and not returning to its original position.

5. Observe whether the pump body is running normally and whether there is any belt slippage.

6. During homework, the tank was filled with sewage and sewage, and the following treatment measures were taken: ① Clean the inlet filter and all inlet pipes from the four-way valve to the overflow valve. ② Clean the four-way valve and the two inlet filters of the pump body. ③ The water circulation pump needs to replace the water supply tank and dirty water inside the pump body (the oil pump needs to remove the pump body to clean the inside of the pump body and replace all the oil inside the pump).

7. The pump has not been fully pumped, and there is no such situation as mentioned above. Possible reasons include: ① Water circulation: prolonged use, damage to the impeller inside the pump body, or sediment inside the pump body. The pump body needs to be disassembled for inspection. ② Oil pump: Prolonged high-speed operation causes the pump body to heat up, internal sliding plates to wear out, or prolonged failure to replace internal oil, resulting in viscous oil.