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Four Reasons And Solutions For Diesel Water Pump Not Pumping Water

Four Reasons And Solutions For Diesel Water Pump Not Pumping Water

Do you know the reason why the diesel water pump often fails to pump water? What is the cause of these failures? What are the differences? Here, we wil make the clear explanation for the reasons of not pumping water.

There are four reasons for pumps not pumping water. Firstly, the impeller ratation is unbalanced, the coupling is not tight enough, and the parts are loosened and broken, etc., and the pump will vibrate greatly. Secondly, the nut is not tightened during installation, resulting in water leakage and air leakage in the water pipe. Another reason is that the cold water cannot enter the packing or the surface of the shaft has been demaged because the packing is pressed too hard. Now there is last one reason. The water in the pump body is not full or there is air in the inlet pipe.


After knowing why the pump not pumping water, we need to find the solution to solve these problems.

How to solve the first reason, unbalanced impeller ratation and not tigithened coupling. We can adjust, strengthen, repair and replace the failed parts. About the water leakage and air leakage, we can use cement and asphalt oil to block the leak if there is a silight leak only. If the leak is serious, it must be replaced or reinstalled. Thirdly, in order to solve the packing be pressed too hard, we oly need to loosen the packing and then clean the blocked pipe. In the last case, we can fill with water to pump body and exhaust the air out of the pipe.


We believe that after reading the above content, you should be able to know what are the 4 reasons why the water pump does not supply water, so that you can also follow the above steps in the future to solve the problems when you are in such situation in the process of daily using the clean water pump.

However, solving the problem is not the fundamental solution. What we need to do is how to avoid failures as much as possible. In this case, we have to mention the daily maintenance and maintenance of our diesel water pump. Because we can only try our best to maintain and maintain the centrifugal water pump, so as to avoid and reduce the occurrence of failure problems as few as possible. Now, please continue reading and follow us to see how we can maintain and maintain the centrifugal pump.


How to maintain the centrifugal pump. Maintenance is divided into different stages and different aspectss.

Let us talks about the daily maintenance.

When the water pump is not under working, we need keep the equipment clean, dry, free from oil stains and leaks.

During the diesel centrifugal water pump working, we need to do the following check every day in order to find the problem and solve it in time, checking whether the running sould of the water pump is normaly or not, checking whether there is vibration and leakage or not, checking whether the oil level in the suspension oil chamber of the centrifugal pump is appropriate and it must be kept at 1/3 and 2/3 of the oil level. 

Thereare two things should be paid with 200% attention. It is strictly forbidden for the diesel water pump to work without water, such as still works when the liquid in the pool (bucket) is evacuated. Because the pump vibrates violently when diesel water pump works in an evacuated state, it will shorten the lifespan of the pump. Secondly, it is strictly forbidden to insert metal objects and flexible substances such as rubber, cotton yarn, plastic cloth, etc. into our diesel water pump, so as not to damage the overcurrent parts of the pump and block the flow passage of the impeller, so that the pump cannot work normally.

We also put the maintainence file in our diesel generator packing, we need to replace the engine oil, air filter, oil filter and fuel filter in time based on the list.

Always check whether the support mechanism of the centrifugal pump inlet and outlet pipeline system (pipe fittings, valves) is loose, to ensure that the support mechanism is firm, and the pump body does not bear the supporting force.

The fastening of the foundation fastening bolts of the diesel water pump should be checked frequently to ensure that the connection is firm and reliable.

When the diesel clean water pump is not used for a long time, the pump should be disassembled, treated with anti-rust treatment, reinstalled, and properly stored for the next use.

When the diesel water pump runs for a long time, such as one week, periodic inspections should be carried out to repair or replace damaged parts, so that the pump is always in good condition.

What should we do for maintenance during the diesel water pump operation.

First, the water pipeline must be highly sealed. Second, long-term operation of the pump under cavitation is prohibited. Third, it is forbidden to run the motor over current for a long time when the pump is running at flow rate. Fourth, The pump should be supervised by person during operation to avoid accidents. Finally, after the pump runs for a long time, when the noise and vibration of the unit increase due to mechanical wear, it should be stopped for inspection, and the vulnerable parts and bearings can be replaced if necessary. The unit overhaul period is generally one year.

The maintenance of mechanical seal is needed top.

First of all, the mechanical seal lubrication should be clean and free of solid particles. Secondly, It is strictly forbidden for the mechanical seal to work under the condition of dry grinding. Besides, before starting, the engine should be added with enough oil. On one hand, check the diesel water pump pipeline and joints for looseness. Turn theimpellter by hand to see if impeller was blocked. On the other hand, adding the engine oil into engine body and oberve that the oil level based on the oil gauge to ensure it reaches the marked line. Next thing is that the filter of inlet water pipe is needed incase that there is other thing enter the the pipe and block the whole water system. Tighthen each connection to avoid the loosen and pipe disconnected because of the large force during work. If you order the diesel water pump with electrical start, must ensure the battery is far away from the water. Our special design makes the battery installed higher than the frame.

Try to control the flow and head of the diesel water pump within the range indicated on the sign to ensure that the centrifugal pump operates at the highest efficiency point in order to obtain the greatest energy-saving effect. Otherwise, it is possible that cannot pumping water and lifespan is shortened.If abnormal sound is found in the diesel water pump, stop immediately to check the cause. When the centrifugal pump is to be stopped, first turn off the diesel engine and then remove the water pipe. The diesel clean water pump should replace the engine oil after 100 hours within first operation, and once every 500 hours thereafter, details can be seen in our manual and the change time need to be shorten based on the actual use situation. Regularly check the wear of the shaft sleeve, and replace it in time when the wear is large. When the diesel water pump is used in the cold winter season, after parking, it is necessary to unscrew the drain plug at the lower part of the pump body to drain the medium. Prevent freeze cracking. If the water pump is out of use for a long time, it is necessary to disassemble all the pumps, dry the water, apply grease to the rotating parts and joints, and store them properly.


Well, the above is about the four reasons and solutions for the pump not pumping water, as well as the daily maintenance and maintenance knowledge of the centrifugal pump, I hope it can be helpful to everyone. Besides, our water pump is drived by diesel engine, this article is mainly written to tell the maintanence of pumps. Not only need to pay attention to the pump maintenance, but also we need to learn how to use and make the correct maintenance of diesel engine, the another main part of the diesel clean water pump. More information can be read in our site. Besides, different function of diesel water pumps, the using attention is different although the most main idea is same. Such as, the different inches of water pump and different power of connected diesel engine, the flow, suction and head will be different. Diesel clean water pumps need to be added with filter on the inlet water pump, and so on.

If you still want to know more relevant knowledge, you can continue to pay attention to this site.  If you have any interested in water pumps, can find us in the website for in time communication.