Do-it-yourself water pump repair: review of popular breakdowns
Owners of country houses and cottages have to independently organize the water supply of their own plots. Agree, this is a very difficult task. And without a borehole pump, it becomes simply unsolvable. Many homeowners, after examining the offers on the market, opt for the Vodomet centrifugal well pumps manufactured by the Russian company Dzhileks.
These devices do an excellent job with supplying water from various structures, but from time to time they still break. The fastest solution to the problem is to repair the pump with a water jet. You can’t call this simple task, but many home craftsmen cope with it more than satisfactorily.
We will talk about how the water cannon pump works and how it works. We will also discuss the most common equipment failures and their causes.The material contains thematic videos that will help make the repair of the pump with their own hands.
How does the "water cannon" work?
The device of the centrifugal pump “Water cannon” is somewhat more complicated than that of the vibratory “Kid” or “Stream”. In the lower part of the unit there is an air-tight oil-filled engine, on the shaft of which original glasses are put - elements with working floating wheels.
Depending on the capacity of the pump such glasses may be more or less. The top cover of the pump presses all these elements and holds them in the correct position. From this cover comes out an electrical cable, a water inlet to the water mains and eyelets for hanging the pump.
Floating impellers - “highlight” of this unit. At the very beginning of work, they are lapped to the structure by grinding a plastic bead. As a result, a minimum gap is formed between the static and moving elements of the device. Such design provides high efficiency of the pump.
Another advantage of the floating wheels of the pump is the ability to pass sand particles that enter the well during the natural processes of sanding. Water pump type A models are similarly designed.
They are additionally equipped with a float switch, which is designed to turn off the device in case of an emergency. For example, if for some reason water has dried out at the source (low debit, flooding, etc.).
The borehole pump “Vodomet”, despite the absence of such protection, works quite well. It can be turned on / off every three minutes without compromising the integrity of the structure.
To prevent the situation with the occurrence of a “dry run”, which is detrimental to any pump, it is necessary to choose the right model, suspend it at the right height, etc.
An additional element extends the life of the device, but requires additional space for placement.For this reason, Water Sprayer A ”is usually used not in wells, but in wells. But this model has to be repaired in about the same way as the well pump.
Another feature of the submersible water jet pump is the lower water intake. The design allows the pump to be used in a semi-submerged state. If you need to completely empty the tank, "Water Cannon" will cope with the task.
But in a filter well, positioning the pump in this way is not always helpful. The device will constantly take sand from the bottom. This adversely affects both water quality and the condition of the impellers of the device.
To prevent a problem of this nature, self-made nozzles are put on the bottom of the pump to prevent sand from entering the device.
The unit should be located in the well in such a way that between the bottom of the working area and the bottom of the pump there should be at least 1 m.
The water cannon is designed for pumping water with a temperature of + 1º to + 35º C. It is not recommended to disturb the temperature regime for its normal operation.And you can not turn on the unit more than 20 times per day.
In order to eliminate premature wear and damage, it is not possible for the water cannon to work without water. The device must be grounded. It is necessary to turn on the RCD, which turns off the device in case of current leakage more than 30 mA.
How to disassemble the "water cannon"?
The device of the “Water Cannon” pump cannot be called completely simple and understandable. Before you start disassembling, it is recommended that you familiarize yourself as much as possible with the features of its design. It does not hurt to fix the correct position of each element: record, take pictures, shoot video, etc.
Attention should also be paid to the correct position of every detail in relation to the concepts of “top” and “bottom”. If the wheels after repair were installed incorrectly, the pump will still work, but not too efficiently.
Problems may arise after rewinding the engine. Not all pump owners remember the correct location of contacts.
Of course, before disassembling the pump, it is necessary to disconnect the pump from the power supply and remove it from the well. To facilitate the work, it is better to disconnect the water supply pipe from the nozzle and remove the metal cable.
When the pump is in working position, its engine is in the upper part, and the pumping part, consisting of the impellers and glasses with covers, in the lower part. But when disassembling the pump, it is more convenient to keep it “upside down” i.e. engine down.
The first step when disassembling the pump is to unscrew the bottom cover. Perform this operation with a long enough screwdriver, threaded into the eyelets for hanging the cable. It is necessary to turn off counter-clockwise.
It may be more convenient to use other devices, for example, gas key number three. A device for removing the oil filter cover, familiar to motorists, or its equivalent from a strip of strong fabric with a lever for twisting, will also be suitable.
After that, from the pump body you need to carefully remove the chamber-glasses with covers and wing wheels. The lids of the glasses are numbered from 1 to 3. Usually, all the glasses with the number “1” are put on the shaft, then with the number “2”, then with the number “3”.
When disassembling the water pump, these elements will be removed in the reverse order. It is better to write down the order of numbering of glasses in order to avoid errors during assembly.
Do not interfere immediately to clarify the direction of movement of the shaft. To do this, the pump with the wheels removed just turn on for a few seconds. The wheel should stand in such a way that the water is drawn down from the bottom in the center and the water goes up to the outer part of the ring.
In the correct position, the ring with blades should be set with the wide part towards the engine, i.e. jutting down and smooth side up.
The pump shaft is not twisted, as in similar models, but fixed with two clips. If it is necessary to remove it, it is necessary to clamp the clips with pliers and remove the shaft. When the glasses with the impellers are removed, it may also be necessary to remove the electric motor.This will require some effort, since it is pressed into the body tightly enough.
In order not to bend the shaft, it is necessary to place the pump casing on a support with a hole into which the shaft can be inserted. After that you should gently knock the engine out of the body with a hammer and a plank. Hammer hit the butt, and the plate serves as a shock absorber.
When the position of the engine in the housing changes, you must first remove the ring-shaped retainer gasket. It should be rotated inside the body by 90 degrees, slightly squeezed and removed so as not to damage the internal thread of the body. You can immediately pay attention to the position of this gasket.
It should be turned to the engine by the side from which the chamfer was removed. After that, you can remove the engine from the housing. It is closed by the top cover of the pump, which is fixed by means of two strong sealing rubber bands.
To remove the cover, you need to put the engine on its side.Then the cover is gently knocked out of the motor housing, striking it with a wide screwdriver and a rubber mallet. Other suitable tools can be used for this. Under the cover is a capacitor. Sometimes this element fails, but it is not difficult to replace.
When handling the pump casing, care should be taken. Sometimes it is necessary to fix the device in a vice. First, it is recommended to wrap the case in place of fixation with a shock-absorbing material. The force must be moderate in order not to deform the product.
After the repair is completed, it is necessary to properly assemble the pump. If you make mistakes at this stage, the device will need another repair. When performing the reassembly, follow these steps:
- Install the capacitor in place.
- Carefully lay the wires inside the motor housing.
- Press in the top cover of the pump.
- Insert the motor into the pump housing.
- Press the assembled motor in such a way as to ensure its tight entry into the butt end of the body.
- Insert the ring-shaped retainer gasket, push it to the stop using a suitable tool.
- Put the white impeller on the shaft with the smooth side to the engine, i.e. down.
- Put the white gasket on the shaft and then the assembled glass with the lid “bottom” (ie this lid) down.
- Wear a blue puck.
- Re-install the impeller, white washer, glass, blue washer.
- Repeat until all items have been installed.
- Cover the stack of glasses with a lid and carefully tighten it with a gas wrench or other device.
To make it easier to press the motor into the housing during reassembly, the edge of the housing can be treated with silicone grease. During the installation process, it is necessary to pay attention to the numbering of the glasses and to strictly follow the sequence of their installation. Top set the pressure pad.
In order to prevent further breakdowns, it is recommended that, with marked wear, this element be replaced with a new gasket. Usually, a new gasket can be purchased from the manufacturer or selected in specialized outlets. After the repair of the pump is completed, you need to check its operation.
You can immerse it in a container with water, for example, in a bucket, to make sure that the device turns on and is able to pump water. But an idea of how good pressure will provide a pump in the system, thus it is impossible.
Checking the operation of the pump for pressure can be done at a service center, but first it is better to clarify whether this is possible.
Another test option is possible if there is a large volume at the disposal of the pump owner. Of course, you can check the characteristics of the repaired pump right in the well, but if problems are found during the test, the device will have to be taken from a sufficiently large depth. Preliminary checks on the surface will help to avoid this.
Typical faults and repairs
If the pump "Vodomet" is under warranty service, the easiest way to solve all the problems in the service center.But when the deadlines have passed, the owners usually prefer to save money and carry out repair work on their own. Some operations, such as replacing worn out working rings, are simple.
But if you need to rewind the engine, it is better to entrust this matter to specialists. As for spare parts and components, they can be purchased without any problems and at a very reasonable price.
The company “Dzhileks” willingly sells spare parts for their products. They are sold in specialized stores and service centers. You can apply directly to the factory.
By the nature of the breakdown of the device, you can roughly judge what kind of repair work will be needed. Here is a list of typical problems faced by the owners of the Vodomet pump:
- The device does not turn on.
- The pump body is beating current.
- The water pressure in the system has decreased markedly.
- The pump works unevenly, making sounds that are uncharacteristic for normal functioning.
And here is a list of faults that are typical for these symptoms and ways to eliminate them:
- Burned motor winding.It will have to be completely replaced.
- A contact has left or a wire has been broken.It is necessary to open the motor housing, to restore the connection with the contacts and / or the integrity of the electrical cable.
- The integrity of the motor housing is broken.As a result, the condenser is wet, it should be replaced with a new analogue.
- Worn impellers.It is necessary to disassemble the pump and replace them with new elements.
Of course, if the pump is already removed from the well for repair, it makes sense to carry out a full diagnosis of the unit. Pump dismantled, inspect gaskets, washers, glasses, impellers and other items. If signs of wear are noticeable, you should immediately take care of replacing such elements.
Then it makes sense to disassemble the engine, to test the state of the contacts and the feed wire. If necessary, find the location of the cable damage and reconnect. Sometimes it is worth replacing the power cord completely.
Problems with a damp condenser are usually obvious even in appearance. Soldering a new capacitor is usually not difficult, but during the reassembly it is necessary to eliminate the cause of the malfunction, i.e. to ensure sufficient tightness of the motor housing.
As already mentioned, the burnt-out winding of the engine will be difficult to perform correctly at home. This operation can be ordered at the factory, and all other work can be performed independently. So repair will be cheaper. In some cases it is easier and safer to replace the engine with a new device.
When the engine is depressurized, there is a situation that experts characterize with the word “emulsion”. This means that water got into the engine case and mixed with oil, turning it into an emulsion. Oil must be drained and completely replaced.
In no case can not replace this fluid with some ordinary engine oil. The only suitable lubricant for Vodomet pumps is pure glycerin. The fact is that in the event of a breakdown, the oil can get into the well and significantly spoil the quality of the water. To get rid of such pollution is very difficult.
Popular causes of breakdowns
The main causes of breakdowns of the Vodomet pumps are only two: errors made during the manufacture of the device and difficult operating conditions. Influence the first situation of the pump owner is powerless.
If we are so unlucky that we got a defective unit, we need to tune in to long-term cooperation with the service center within the framework of warranty obligations.
Careless handling or improper installation of the device is quite common. Do not pull the pump by the electrical cable, this is the weak point of the pump. In case of careless handling, small cracks may form at the place of its entrance into the engine housing.
Over time, they expand, moisture penetrates into the body and the engine becomes unusable. The contact can be broken in the same way. Cable breaks can be caused when the pump is installed, if the wire is broken or accidentally broken.
Wear of the impellers may be caused by prolonged contact with water contaminated with sand. The manufacturer, of course, does not recommend pumping the Water with a Jet with the inclusion of sand and clay suspension to two kilograms per cubic meter of water in the well.
However, the manual does not say how much water can be contaminated and how long it can be transported without affecting the design of the pump.
Practice shows that the “Vodomet” pumps can be used only in any one capacity. Or to supply water to the pipeline, or to remove sand from the well.
After pumping over the dusty structure, the owner of the pump is surprised to observe the uneven operation of the pump. The reason is simple - the impellers are worn out and require replacement.
It is easy to rectify the situation, but it is possible to pump a contaminated well or pump it after drilling in a more efficient way: using a submersible vibration pump of the “Kid” or “Stream” type. Such equipment is cheaper and easier to repair.
Another reason for water pump damage is improper suspension of the pump. If the device’s immersion depth exceeds the number specified by the manufacturer, the device operates at elevated loads for which it is not designed. Often in such situations there is depressurization of the engine.
Conclusions and useful video on the topic
The following material is very clearly presented, how to properly disassemble the pump jet, as well as the process of reassembling one of the models:
Disassembling and repairing the Vodomet pump requires attention to detail and some skills. Over time, the task becomes quite feasible and familiar. Many home craftsmen maintain and repair such pumps, while achieving complete success.