DIY pump repair

In detail: do-it-yourself flow pump repair from a real master for the site my.housecope.com.

Modern features of power grids, as well as water supply networks, violation of operating rules, negative environmental factors lead to premature failure of water pumping equipment. Having found defects and malfunctions in the operation of the unit, it is not necessary to make a radical replacement. In some situations, it is possible to repair pumps at home.

If the breakdown is not serious, it is quite possible to repair it yourself, otherwise it is better to contact the nearest service center.

When using hydraulic equipment, prompt and timely detection of units and parts that need repair is of great importance. Diagnostics is an effective and simple method for identifying such parts without dismantling. It allows for indirect parameters to determine the performance of the elements of pumps for water. These indirect parameters of hydraulic structures are considered, for example, the frequency spectrum of vibration or noise of the hydraulic system during operation.

Vibration pump device

The performance of the devices is assessed by the failure of several or one main operating parameter to be out of tolerance. For pumping equipment, such parameters are pressure pulsation and performance, for servo spools - flow in the neutral position of the oil, for reversible spools - leaks, for safety valves - minimum flow. The following components are most susceptible to aging and wear:

spools, plungers;
seals;
movable mates;
springs when the number of operating cycles is exceeded.

Video (click to play).

Common causes of water pump failure include:

pressure surges in the hydraulic system;
contaminated water with solids content exceeding the established limit;
incorrect selection of materials for rubbing pairs;
contact fatigue;
uneven thermal expansion of materials;
erosion and cavitation wear;
hydraulic entrapment;
making mistakes when installing the unit;
work in modes other than the regulated ones (operation in "dry" mode);
improper fastening of the cable connection;
damage to bearings;
air ingress into the flow path;
impeller blocking, shaft oxidation and others.

Some breakdowns occur as a result of malfunctions in the pressure switch, engine, lack of a filter. An increase in heat generation in the hydraulic system often leads to an accident as a result of jamming of moving parts. Stabilization of the temperature of the pumped medium increases the durability of the pumps, reliability, and extends the overhaul cycle.

Most often, the owners of water equipment complain about the following malfunctions:

The power cord is damaged.
The water pressure has dropped, does not match the pump power.
The water supply has stopped.
When starting the electric pump "knocks out" the electrician.
High pressure pump motor does not start.
The pumping equipment switches itself off.
There was a hum, strong vibrations.
Overheating of the device.
Leakage of liquid inside the device.
There are problems with the control system.

Do-it-yourself repair of household models intended for the water supply system is carried out when it is possible to replace a broken part and the necessary spare parts are available, when it is easy to perform technical procedures, for example, to clean the unit. Pump repair always begins with disassembling the casing. The next step is diagnostics, which allows you to find a faulty part and select an identical one.

Available actions are: replacing the condenser, float, impeller, repairing the electrical cable, removing suspended particles that have entered with water, fixing the shock absorber.

First, a number of pre-repair measures common to all types of water pumps should be carried out:

Pull out the pump carefully. Carefully examine and study the constituent elements of the equipment.
Check the presence / absence of damage to the case, whether there is dirt or corrosion centers.
If the pump starts, listen to its operation, the detected side sound may indicate a defect. Extraneous noise indicates mechanical failure.
Turning off the machine and the pumping system as a whole often indicates a banal overload. Therefore, it is necessary to disassemble the junction box and make a visual inspection of the inside. A part that has overheated is visible to the naked eye, and a burning smell is also noticeable.
If the cause of the failure by this stage is not clear, the impeller is removed from the pump motor in order to check in which state the motor itself rotates - free or not. An attempt is made to manually scroll the structure shaft. If it does not rotate, it is probably a motor jam.

Do not forget about the position: before disassembling, the upper part of the electric motor must be vertical. Failure to do so will inevitably lead to oil leakage, which is the working fluid of the pumps. After installation, the cover is removed through which the power cables pass. After, using an ohmmeter, the starting capacitor is diagnosed.

Circulation pump device

An ohmmeter allows you to check the resistance of the working and starting windings. For this purpose, the terminals of the measuring device are connected to the winding, the handle rotates. You should not worry about the state of the winding if the ohmmeter shows resistance that does not reach infinity. Otherwise, the problem lies in the loss of the motor phase. Too little resistance is a "messenger" of turn-to-turn closure. In all of the above problems, the repair of the water pump should be carried out by a specialist.
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A pump for increasing water pressure has its own characteristic defects: holes in the cover, housing, and suction nozzle, cracks, wear of the shaft, bearings, wear of the wheel blades, corrosion damage. Cracks and fistulas in the pump cover and casing are eliminated by welding them, or by replacing parts with new ones. Shaft journals for bearings are restored by chrome plating or chrome plating. In this case, the liner bushings (sleeve bearings) are exclusively replaced.

If minor corrosion damage is found, deburring is required. The same is done in the case of erosive wear of the wheel blades. If the pump for increasing the water pressure has deep sinks, they are welded. The impeller fit is restored by building up a seat on the shaft using an electrolytic method or an elastomer.

At the end of the repair of the wheel and shaft, they are assembled and statistically balanced, the runout of the shaft journals (the norm is 0.02 mm), the end and radial runout of the wheel (0.04 mm) are checked. At the time of assembly of the pumping equipment, gaskets for sealing and stuffing box packing are replaced in the section of the cover and body connector. Then you need to adjust the gap between the wheel and the body from 2 sides (permissible value is 0.07 mm). Finally, check the rotation of the pump rotors, which should be without jamming. When aligning with an electric motor, do not forget to comply with the norms for kink and displacement, in accordance with the type of coupling.
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Repair of VVN pumps is extremely rare. The components and parts of the device do not come into contact with each other, and the working fluid lubricates them, which increases the pump's resource and extends its service life.However, VVN also has malfunctions. Start by assessing the nature of the breakdown. In many cases, the normal functioning of the pump is impaired by insufficient vacuum generation. A similar defect appears when excess air flow enters the inside of the structure of the vacuum water ring electric pump through loose seals, worn out oil seals.

Repair of liquid ring vacuum pump

During operation, make sure that the oil seals and the O-ring are in good condition, as their failure causes serious problems and the threat of damage to the entire mechanism. It is necessary to tighten all nuts and screws, replace the old seals.

A detected imbalance in the pump operation indicates a lack of water. Turn off the unit and add more liquid inside. Contamination of the internals of the device causes a decrease in performance, which is restored by blowing the pump dry with compressed air. If the actions did not lead to the expected result, you will have to carry out a complete disassembly and cleaning of each component.

If the wheel turns incorrectly, check the operation of the electric motor, shaft alignment. If the engine burns out, as evidenced by the release of a burnt odor, it must be replaced. If there are no problems with the engine, simply align the impeller, lubricate or replace the bearings.
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We repair a borehole pump

If you have a well or a well at your summer cottage, then they will never work correctly without a deep pump. A device such as a submersible pump is seemingly durable and does not always work properly.

In our time, breakdowns of submersible pumps are very rare. But suddenly you have a pump failure, you need to pay attention to it in a timely manner and bring it into normal operation.

So that in the future there are no more serious consequences. You can also fix a deep pump with your own hands, if you do not want to call a special master.

The submersible pump is constantly in the water and is constantly influenced by negative factors. In most cases, submersible pumps do not break down instantly, but gradually fail. If you still have a small breakdown, then it is not necessary to replace the pump, you can do a little DIY repairs.

And it is not necessary to change a completely submersible pump with a small defect and it is not advisable. If we compare a submersible pump with a submersible pump, then a submersible pump is easily repaired by oneself than a deep one. Most often, the magnet of the pumping device breaks at a deep pump.

Such a defect is exposed in such pumps as "Aquarius" or "Octopus". If your pump magnet is out of order, then you will not be able to make repairs with your own hands, but only a replacement is provided in special services. There are such breakdowns as extraneous noise during the operation of pumps. And these are mechanical breakdowns that can be easily eliminated by hand.

Deep water pump device

First you need to put the pump upright and disassemble it for parts. If the pump makes noise during operation ("Octopus" and "Aquarius"), then first the electrical system of the pump is checked, which is responsible for the automation system and the operation of the engine.

The most vulnerable pumps of the brand "Sprut" and "Vodoley" in which noises are heard during operation. In this case, you can fix the breakage with your own hands. Breakdowns also occur in pumps such as "Sprut" and "Aquarius"; this is a relay malfunction, as well as dry running failure. Such breakdowns occur most often from clogging of the internal pump system.

Also, if you turn on the pump in dry mode, this can also lead to serious damage. And most often the submersible pump works in dry mode, it quickly runs out of oil, while the mechanism starts to work tightly and not smoothly.If the pump runs in dry mode for a long time, deformation of the internal parts occurs, as a result of which it becomes impossible to repair the pump with your own hands.

That is why pumps such as Aquarius or Octopus must undergo constant diagnostics and, preferably, by qualified specialists.

But infrequent breakdowns of the pumping system are pump overheating, this is when the unit heats up over 40 degrees Celsius, or you have incorrectly strengthened the connection cable. These infrequent breakdowns not only occur with such pumps of the Vodoley and Sprut brands, and other manufacturers.
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If during operation you notice that the pump does not work as it should, extraneous noises are heard, then you need to take action immediately. We recommend checking the devices for minor problems first. On such brands of pumps as "Sprut" and "Aquarius", initially it is necessary to check whether a reboot took place, because of which the machine most often turns off, and then the pumping system.

Pump Aquarius and its repair.

To check this, you must first unscrew and disassemble the junction box. Inside this box, you can see a breakdown, and this is blackening or a burning smell. If everything is in order in this area, the smell is not felt, then proceed to removing the impeller from the pump motor.

First, it is checked whether the engine is spinning. A smoothing capacitor is connected to the engine, through which the engine is started. We also look at the winding around it, which should not be broken or torn. Most often, in these pumps, a breakdown is a burnout of the engine. That is why the impeller is removed to see this.

After removing the impeller, we begin to manually scroll the engine (shaft). If the shaft does not rotate, then mechanical failure is evident. In other words, the pump motor has jammed. Most often this happens due to the fact that small debris and soil can get into the engine. And this happens due to the fact that there is no protective filter on it. If in the future you do not clean the special filter and remove particles on it, then the stator winding in the engine may soon burn out.

ATTENTION! The stator winding cannot be repaired - only replacement.

Before you decide to repair the electric motor, you must put it vertically. If you do not, when disassembling the electric motor, oil will leak, without which the pumping system will not work. Further, in a vertical position, the cover is removed through which the 220 W power wire passes.

Immediately after removing the cover, it is advisable to diagnose the starting capacitor. To diagnose a starting capacitor, you need an ohmmeter. This is checked by connecting the terminals to the motor winding. Then we rotate the handle, and it creates a voltage of 250-300 volts.

If the device shows resistance at the same time, then it is considered that the condition of the winding is ideal. But if the ohmmeter device detects infinite resistance, then there is a problem in the form of a break. Conclusion: the working phase of the motor is not working, there is an open circuit.

If the device shows a small resistance, then we can talk about an inter-turn circuit. Conclusion from the above - on your own, if it happened, it is not possible to fix it. It is better in such cases to contact a specialist. Since in most cases, replacing parts will not help, but only replacing all successive parts will help. Especially if the pump winding has not been fixed.

When viewed further, we look at the pump further. The device shows that everything is in order, we proceed to inspect the starting capacitor. Most often, a breakdown occurs in it. In other words, there is a cliff in it. When the pump is operating, such a problem does not immediately catch the eye, but upon a detailed examination with such a device as an ohmmeter, the breakdown will come out.

At the same time, do-it-yourself repairs of the starting capacitor can be done independently, without resorting to the help of a master. But if this does not work out for you, then it is better to replace the starting condensate with a new one. Since starting condensate is a fatal breakdown.
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Submersible pumps are an integral part of any well operation. They serve so that the flow of fluid can rise upward for human needs. Submersible pumps are now being made very reliable. Their system rarely fails. However, like other types of pumps, submersibles can fail. And there may be a huge number of reasons for this.Submersible pumps fail due to overheating or blockage.It is worth talking in more detail about how to repair deep-well pumps with your own hands. Let's consider how to repair these units that pump water from a depth.Repair of submersible pumps is best trusted by professionals, but this is not necessary. In some cases, an insignificant part may fail that can be replaced or repaired by yourself.Diagram of a submersible vibration pumpAny pump can fail for several reasons at once. In this case, we are talking about the repair of a submersible pump, which works in close proximity to water, which means that various negative factors regularly act on it. Therefore, such a device cannot be called eternal, it can fail. In this case, it is better to prefer repair rather than a complete replacement, since such pumps are quite expensive. Not everyone can afford to buy a new unit in a short time, and water from the well must be constantly supplied.Very often the pump magnet fails. In this case, repairs will not help. It must be taken immediately to a specialized workshop. Only here will specialists be able to fix it.If extraneous sounds are heard when the pump is turned on, then we are talking about a mechanical failure. It is highly likely that the pump can be repaired with your own hands. There can be many reasons for the failure of a pump, since it consists not only of a mechanical part, but also of an electrical one, which is a motor and an automation system. There are both time relays and automatic devices that protect the pump from short circuits. All this can also break down from time to time.In the case of mechanical failures, the cause may be too dirty water, which clogs the pump. Sometimes the pump can run in dry mode, that is, it may run out of oil, which must be present. The device may fail if its working fluid is heated to a temperature above 40 ° C. Failure to properly fasten the cable underwater can also cause damage.Diagram of a submersible pump with overheating protection, non-return valve and dry running protection.If we talk about the electrical part of the pump, then it often requires repair. Various elements can fail here. It could be a circuit breaker that has tripped due to an overload. Possible phase failure, which is used to power the pump. Its windings may fail. Most breakdowns can be eliminated on your own, but you must be extremely careful not to harm those parts of the mechanism that are still in working order.There are still many different breakdowns that lead to improper operation of the pump, as well as to its failure. The reason may be a malfunction of the accumulator, pressure switch or the absence of a filter that purifies the water. If the equipment is completely lacking in grounding, then the failure of the unit can occur due to voltage surges or a short circuit to the motor housing.After it was found that the pump does not rotate, you should start repairing it.First you need to check: perhaps, due to overload, the machine simply turned off. To do this, you need to get into the junction box. Then you need to remove the impeller from the engine, check if it rotates in a free state.Typically, modern submersible pumps are made single-phase.A smoothing capacitor is connected to them, which makes the motor start smoother. It has one winding. The stator of the engine could have burned out. To check this, it is worth removing the impeller. After that, you need to try to rotate the shaft manually. The freed up space makes it quite easy to do this.If the shaft does not rotate, then mechanical damage is possible, more precisely, engine jamming. Various small and large soil particles can get here. They can cause the system to jam. If they are not eliminated in time, this can lead to the fact that the stator winding will burn out. If the shaft rotates normally, the bottom of the motor can be reassembled.Before disassembling the upper part of the electric motor, it is necessary to place it in a vertical position. This measure is necessary, since otherwise the oil, which is the working fluid in most modern systems, may leak out, and this is unacceptable.After that, it is imperative to remove the cover into which the electric motor power wires enter. Here you can immediately find a starting capacitor. You will have to use an ohmmeter to check the resistance of the starting and working windings.To do this, take the ohmmeter terminals and connect to the winding. The handle is rotated, which creates a voltage of several hundred volts. If the device shows a resistance that has a certain value, but not infinity, then all the windings are in good condition. If the device shows infinity on the working winding, then there is a break in the working phase of the motor.If the resistance is, on the contrary, too small, then an interturn short circuit has occurred. When one of the above breakdowns occurs, self-repair is out of the question. The unit will have to be carried to specialists.

DIY deep pump repair

If the submersible pump stops working, this brings a lot of unpleasant moments for the owners of wells and wells in their areas. The main task of the units is to lift the liquid up to meet the needs of the person.
Modern devices are made quite reliable, their system rarely fails, but like all units, they can fail. What are the reasons for the failure of the deep-well pumps, how to disassemble the deep-well pump and repair it is proposed to learn from the article.

To use reserves from underground sources, wells or wells, it is best to use submersible pumps.
Their principle of operation is as follows:

The unit is lowered into the liquid to a mark below the surface level.
The pressure created in the device forces the water upward, for which a hose or pipe for a deep pump is installed.
Simple devices of this type can reach water from a depth of up to 40 meters, more technological and expensive ones - up to 80 meters.
There are two main categories of pumps:

for pure water, are used to obtain liquid purified from impurities. Most often they are made in multi-stage.
dirty.

Submersible vibration pump device

Unit failure can occur for several reasons. When the pump is located directly near water, many negative factors act on it. When carrying out repairs, the price will be significantly lower than the purchase of a new unit.
The reasons for the failure of the device may be:

Exit and building of the magnet. At the same time, ordinary repairs will not help, the help of specialists is needed.

Mechanical breakdown is characterized by extraneous sounds emitted by the pump. You can try to perform such a malfunction of the product yourself.
In case of mechanical failure, the cause may be too dirty water, clogging the pump. Sometimes the device works in dry mode, with the absence of oil, which must be present.
The unit may fail if the working fluid is heated to a temperature of more than 40 ° C. There can be many reasons for unit breakdowns, both in the mechanical part and in the electrical one, consisting of the engine and the automation system.
Here are located:

Time relay.
Automatic elements protecting the pumps from short circuits.

From time to time, all this can fall into disrepair.

Like any device, deep-well pumps require careful handling. Most often, the manufacturers of units provide for the occurrence of possible dangerous situations during operation and produce additional devices that look like an external unit of automation and product control.

Deep well pump connection diagram

During the operation of a submersible pump, it is necessary that the following are excluded from the system:

Dry running. It occurs when it falls below the critical water level, and the unit branch pipe turns out to be above it. As a result, the device fails. This phenomenon can be prevented:

installation of a float system;
immerse in the water two special electrodes or level sensors that are connected to the protective device. When the lower electrode is located above the water level, the pump turns off, and when the level of the upper electrode is reached, it turns on;
installation of a device that controls the passage of water through the pump. In its absence, this element stops the operation of the pump.

Water hammer. Occurs when the "dry pump" is turned on or when the unit is turned off. At this moment, the liquid hits the impeller blades hard, which can severely damage them and lead to the failure of the pump. You can solve the problem:

a check valve device made of high-strength materials, which can reduce the weight of the water column acting on the impeller;
equipment of accumulators with pressure switches and sensors that can turn on and off the pump when there is an excess of pressure in the system.

Unstable parameters in the power grid.

Advice: When purchasing a submersible pump, you need to pay attention to the permissible voltage deviation that the unit can withstand and the presence of protection of the electric motor from unexpected voltage surges in the network.

Freezing of water. Such a phenomenon is unacceptable in the pump housing. When the temperature drops below zero, the water must be drained. With year-round use of the device, it is installed in caissons.
Turbidity of the pumped liquid. The presence of abrasive particles can lead not only to jamming of the submersible pump, but also to damage the entire path.

In the event of a breakdown of the unit, first of all, it is necessary to carry out its diagnostics and identify the cause of the malfunctions.
The instruction suggests the following order of work:

It is determined whether there is no overload in the network, which can lead to the shutdown of the circuit breaker. For this:

the junction box must be opened;
remove the impeller from the engine;
check its rotation with no load.

The photo shows the order of assembly of pump elements:

Advice: For a smooth start of the engine, a smoothing capacitor must be connected to it.

After removing the impeller, it is checked whether the motor has burned out.
The shaft is scrolled manually. The previously removed impeller will not interfere with this.
If it is impossible to turn the shaft, a mechanical failure of the element may have occurred, which led to the engine jamming. In this case, various small and large soil particles could get into the unit.
The stator winding can burn out from untimely removal of dirt.
During normal rotation of the shaft, the lower part of the motor is collected.

There are several ways that can help facilitate the repair of a deep well pump:

Disassembling the upper part of the electric motor must be started after installing it vertically. This will prevent the oil from leaking out, which is unacceptable, since oil in most modern systems is a working fluid.
The cover is removed, where the wires supplying voltage to the electric motor fit. The starting capacitor is also clearly visible here.
Checking the resistance of the starting and working windings should be carried out using an ohmmeter, the terminals of which are connected to the winding.
By rotating the handle, it is necessary to create a voltage of several hundred volts. If the reading of the device has a certain value, but not infinite, then all the windings are in good order. The reading by the device on the working winding of infinity indicates an open circuit in the working phase of the motor.
A low resistance value indicates that a short exists between the motor turns.

Tip: In the presence of the above breakdowns, it is almost impossible to fix everything on your own. It is better in this case to send the device to a specialized workshop for repair.

If all devices show the health of the elements, you will need to check the starting capacitor.
It is possible that it is defective or an open circuit has occurred in the element. Such a defect can be detected accurately by the device, although outwardly everything looks fine. You can replace the capacitor yourself.

You can get acquainted with a step-by-step work execution plan using an example: how the octopus deep-well pump is being repaired.
To carry out the work you will need:

Screwdrivers: flat and Phillips.

Key for "9" open-end and cap.

Brush for working on metal.

Construction brush with medium hardness.

An auxiliary fluid is required to facilitate dismantling.

The work is carried out in the following sequence:

The middle part of the pump is dismantled. For this:

the pump is cleared of dirt;

the intake protective grill is disconnected, fixed with two screws;

unscrew the four screws connecting the two main parts of the device.

Cleaning the auger and, if necessary, replacing it. In this case:

the worn twisted rod is unscrewed counterclockwise;

the new element is installed in the reverse order;

such a part comes in one set with a rubber bushing, which requires its replacement with a new one.

The upper part of the pump is disassembled to replace the rubber tube.

structural elements are disconnected and the element is replaced;

the upper part of the body is assembled in the reverse order.

Checking the oil level. If there is not enough oil in the device, it must be completely replaced. Vaseline oil works best. Less commonly, propylene glycol or glycerin is used.

How pumping stations for a house with a deep pump are repaired can be clearly seen in the video in this article.
After completing the repair of submersible pumps or their preventive maintenance, it is necessary to adhere to an orderly scheme for dismantling and installing the device. Bolts and engravers should be in their original positions.
At the end of the assembly process, you need to pay attention to the connection of the places of the body part of the product. All fasteners must fit snugly against the base of the enclosure.
They should not be allowed to "undershoot". Slots or gaps will increase mechanical wear on the internal and external components of the pump being serviced.
After all the worn-out parts have been replaced, the deep pump can be installed. Timely repair of the deep-well pump will increase its service life.Submersible pumps have to work in difficult conditions. They are constantly exposed to water, vibration, low temperature, abrasive particles, etc. But despite the fact that the units are made from parts with a large margin of safety, various malfunctions appear in them over time. To repair water pumps with your own hands, you need to familiarize yourself with the main symptoms that indicate certain breakdowns in the equipment.If malfunctions are noticed in the operation of a submersible pump, then it does not always need to be removed from the well for inspection. This recommendation only applies to pumping stations where pressure switch installed... It is because of him that the device may not turn on, not turn off or create a poor water pressure. Therefore, first the operability of the pressure sensor is checked, and only after that, if necessary, the pump is removed from the well.Important! In the case of submersible pumps that operate without accumulators, they should always be removed from the mine at the slightest sign of failure.It will be easier to diagnose water pump malfunctions if you first familiarize yourself with the most common failures of this unit.The reasons that the pump does not work may be the following.

Electrical protection tripped... In this case, disconnect the machine from the mains and turn the machine back on. If it knocks out again, then the problem should not be looked for in the pumping equipment. But with the normal switching on of the machine, do not plug the pump into the network anymore, you must first find the reason why the protection worked.

Blown fuses... If, after replacing, they burn out again, then you need to look for the cause in the power cable of the unit or in the place where it is connected to the mains.

Cable damage has occurredunder water. Remove the device and check the cord.

Dry-running protection of the pump has tripped”. Before starting the machine, make sure it is immersed in liquid to the required depth.

Also, the reason that the device does not turn on may lie in the improper operation of the pressure switch installed in the pumping station. It is necessary to adjust the starting pressure of the pump motor.There can also be several reasons that the device does not pump water.

Shut-off valve closed... Turn off the device and slowly open the tap. In the future, you should not start the pumping equipment with a closed valve, otherwise it will fail.

The water level in the well has dropped below the pump... It is necessary to calculate the dynamic water level and immerse the device to the required depth.

Stuck check valve... In this case, it is required to disassemble the valve and clean it, if necessary replace it with a new one.

Clogged intake filter... To clean the filter, the hydraulic machine is removed and the filter mesh is cleaned and washed.

Also, the decrease in performance causes:

partial clogging of valves and gates installed in the water supply system;

partially clogged riser pipe of the apparatus;

depressurization of the pipeline;

incorrect adjustment of the pressure switch (applies to pumping stations).

This problem occurs if the submersible pump works in tandem with a hydraulic accumulator... In this case, frequent starts and stops of the unit can be provoked by the following factors:

the pressure in the hydraulic tank has dropped below the minimum (by default it should be 1.5 bar);

there was a rupture of the rubber bulb or diaphragm in the tank;

the pressure switch is not working properly.

If you notice that the water from the tap does not flow in a constant stream, then this is a sign of a decrease in the water level in the well below the dynamic... It is necessary to lower the pump deeper if the distance to the bottom of the shaft allows this.If the pump is humming, and water is not pumped out of the well, then there may be several reasons:

there was a "sticking" of the impeller of the apparatus with its body due to long-term storage of the apparatus without water;

defective motor start capacitor;

the voltage in the network sank;

the impeller of the pump is stuck due to dirt collected in the housing of the apparatus.

If the automation does not work, the pump will work without stopping, even if excessive pressure is created in the hydraulic tank (seen from the pressure gauge readings). It's all the fault pressure switchout of order or incorrectly adjusted.

Video (click to play).

Remove the mesh and turn the motor shaft by hand. If it does not spin, then the problem may be located either in the engine compartment or in the pumping part of the apparatus.

First, you need to disassemble the pumping part of the device. Unscrew the 4 screws holding the power cable channel and detach it from the device body.

Next, unscrew the 4 nuts holding the pump flange.

Now that you know how the hydraulic machine is disassembled, you can try to repair the submersible pump with your own hands.

Mostly impeller blocking occurs due to clogging them with sand or dirt deposits on them. In addition, the impellers can be soldered together when a high temperature occurs in the unit, when the pump is idling (dry running). To repair this section of the unit, it is necessary to remove the impeller (s) and remove the accumulated dirt. If the impellers are damaged, they will need to be replaced with new ones.

It is not recommended to repair the pump motor on your own, since it requires special knowledge and the necessary equipment to diagnose this unit and subsequent repairs.

On some pump models, removing the motor will require pressing it out using special equipment. Replacing the oil seal and bearing also carried out at the service center.

If engine hums and won't startthen the capacitor should be checked. It is located in the pump block in which the motor is mounted.

But when the shaft with the impellers rotates without problems, then in order to remove the hum in the water pump, you should disconnect the condenser and replace it with a new one. Better of course check this part with a multimeter, since similar symptoms can be caused by a short circuit in the motor windings.

The water pump motor is located in a special glass filled with oil, and by its condition it is possible to determine some breakdowns in the electric motor block.

The oil has a characteristic, unpleasant odor... This means that the engine is still in working order, but it has been working with great overloads.
Turbid oil - water has entered the engine housing due to a crack in the housing or failure of the oil seal (cuff).
Black oil with an unpleasant odor... In this case, we can say with great confidence that the varnish burned on the engine coils.

Important! Normally, the oil should be clear. Its quantity is determined by the unit model. On average, the volume of oil poured into the chamber is at the level of 0.5 liters.

If, when opening the engine, the above changes in the quality of oil were noticed, then first you need to repair this unit, and only after that fill in new grease.

Everyone knows what is dissolved in water some gas... When a liquid moves at a certain speed, rarefaction zones are sometimes formed in it. In these zones of reduced pressure, gas bubbles begin to emerge from the water. After the bubbles hit the high-pressure zone, they collapse. This process occurs with the release of a large amount of energy, from which the impellers and the pump volute are destroyed. The next photo shows the unit impeller destroyed by cavitation.

The energy of the collapsing bubbles is capable of creating shock wavescausing vibration. It spreads throughout the entire unit and affects not only the impeller, but also the bearings, shaft and seals, from which these parts quickly become unusable.

The cavitation effect can most often be observed in pumping stations that work for suction.... In such systems, the impeller creates a vacuum, due to which water rises through the hose from the well. But if there is a lack of liquid at the pump inlet, then an excessive vacuum occurs in the impeller zone, provoking cavitation.

Important! The most obvious signs of cavitation are vibration of pipes and the pump itself, as well as increased noise during its operation. If you do not take any measures to eliminate this process, then it can completely destroy the station.

To prevent cavitation in the pumps, you should adhere to the rule: there must be more water at the inlet than at the outlet. This can be achieved in several ways:

move the device a little closer to the source;
the diameter of the suction pipe (hose) can be increased;
to reduce the resistance in the suction section, the suction pipe can be replaced with a pipe made of smoother material;
if there are many turns on the suction pipe, then, if possible, their number should be reduced;
it is desirable that all bends have large turning radii.