DIY pneumatic hydraulic pump repair

Pneumohydraulic pump AIST 67913325 (10t) pedal for slipway

Pneumohydraulic pump Nordberg N3P (10t) pedal for slipway (reservoir 1690ml)

Pneumohydraulic pump Nordberg N3P1 (10t) pedal for slipway (reservoir 690ml) NEW

Pneumohydraulic jacks are certainly very convenient and effective equipment for lifting large loads (20-50 tons) to a certain height. During the operation of equipment, especially experimental equipment, certain problems arise with it related to design features and internal structure - we will figure out how to fix them as quickly and efficiently as possible.

Pneumohydraulic jacks, despite widespread public opinion, are very simple - the main elements can literally be counted on the fingers of one hand.

1. The body is made of high strength "stainless steel". It exhibits a kind of "duality": it is both a cylinder for a piston and a container for oil.
2. The retractable piston (also called the "rod") is the second main part of pneumohydraulic jacks, the efficiency of the device directly depends on its condition.
3. Well, the third "integral component" is the working fluid, in this case - oil.

The mechanism of operation of a pneumohydraulic jack is very simple: with the help of a pump (foot, hand or air drive), the oil is moved into the cylinder, where the valve moves - this is how the load rises. In simple words, these are just vessels communicating under high pressure.

We have already said that pneumohydraulic jacks, like any other specialized equipment, are not without drawbacks - only in the case of them, they are very easy to fix. In fact, the foremen call this kind of malfunction "working moments", now we will consider them in more detail.

You can solve the three listed problems with pneumohydraulic jacks yourself at home - this will require a little free time and a few of the simplest tools.

We will now list three main symptoms of malfunctions and tell you what each of them says. They can be seen with the naked eye, especially if you work with the jack frequently.

1. Having raised the load to the required height, the device begins to lower it slowly, that is, in simple words, it cannot fix it. In most such cases, the cause of the malfunction should be looked for in the valve and cuffs.
2. The reduced functionality of the device also manifests itself in the inability to lift the load to the height to which it could have been lifted before. In this case, it is necessary to clean the stem from dirt and possible corrosion, if it is bent (for example, a pneumohydraulic jack was used to lift unacceptable weights), then even replace it.
3. If the device does not fully return to its original position (discrepancies, gaps are observed), this indicates that the springs are worn out - they will also need to be replaced.

From these "symptoms" you can easily tell when the air hydraulic jack needs repair. If the problem is corrected quickly, it is very unlikely that it will reoccur.

The decision to buy a pneumohydraulic jack is mainly taken by specialized workshops and service stations, because this is quite expensive equipment that requires special handling.However, advanced motorists also like to use really high-quality and convenient equipment, which means that owners of pneumohydraulic jacks meet among them.

Of all the problems we have listed, as a rule, you can solve everything at home - unscrew the fasteners, remove the valves, the piston, then drain the used oil and follow the prescribed instructions. If you cannot solve the problem on your own, then do not delay contacting a specialized workshop - the sooner you do this, the higher the likelihood of a "complete recovery" of the technique.

Do not skimp on your safety and comfort, use only proven products from well-known manufacturers!

Message # 1 Denis# »28 Jan 2016, 16:28

Hello everyone, I never thought about what and how is implemented inside a conventional hydraulic jack, but I just can't buy in St. Petersburg (!) A pneumohydraulic bottle for 50 tons. The epic is already a month. As I understand it, PNEUMATIC hydraulic is obtained from conventional hydraulic by adding air supply from the compressor.
How to organize it correctly? What needs to be piled and where to stick in order to press not only with a handle, but also with air? Who did the thread like that, are there pictures?

Thank you all in advance

!

Message # 2 vovasm »29 Jan 2016, 00:32

Message # 3 Denis# »29 Jan 2016, 01:25

And now it's the same, only for the dumb one

Today I saw a similar jack alive, it turns out that a certain cylinder is stuck to an ordinary jack, into which air is supplied from the compressor. As I understand it, this is a kind of pneumatic cylinder in which air is supplied from one side of the piston, and on the other side of the piston there is oil in the cylinder itself?
It turns out that I need to disassemble the pneumatic cylinder, instead of the rod, use a hydraulic hose for it and insert it into the jack somewhere. Moreover, it should be introduced so that it does not interfere with the manual plunger, and when the bypass valve is opened, the oil returns to the pneumatic cylinder.
How to do it?

Pneumohydraulic pump AIST 67913325 (10t) pedal for slipway

Pneumohydraulic pump Nordberg N3P (10t) pedal for slipway (reservoir 1690ml)

Pneumohydraulic pump Nordberg N3P1 (10t) pedal for slipway (reservoir 690ml) NEW

Published by admin in Auto 26.01.2018 0 281 Views

In order to increase physical efforts in the process of car repair, body repair hydraulics are used. To correct various dents and defects in places where it is impossible to use straightening hammers or other hand tools, a hydraulic set of stretch marks is used. Hydraulics help speed up the elimination process and can be used for straightening.

For bodywork, hydraulic equipment is used: pumps, lifting devices, cylinders, presses. Slipways for body straightening are completed with hydraulic power devices, pumps, cylinders.

A set containing stretchers on hydraulics is used to force impact on the composite structures of a car during body repair to correct various mechanical damages:

A set of stretch marks for straightening has a standard look and complete set:

• nozzles of various configurations;
• hydraulic pump;
• hydraulic cylinder;
• equipment such as grips and stops;
• extension cords.

If desired, this set can be increased by adding other parts and equipment. The set containing straightening braces is sold in a convenient special box, which makes it easy to transport and store. Stretch marks may include a pump.

The standard body repair kit usually does not have it, but this powerful tool allows you to significantly increase the tensile forces. The stretch marks themselves are divided according to the mechanism of action on the structure in this way:

• tensile equipment required, for example, to straighten a door arch;
• a tension tool (tie) that is used to tighten vehicle elements, such as a collision-damaged wing.

This equipment can carry out work on straightening the body, trunk, roof and hood of the car.

When carrying out such work, the equipment is capable of reaching an effort of 5 tons. Also, the equipment can be used for straightening various metal assemblies and parts, correcting distortions of vehicle elements, replacing thresholds.

When performing body repairs using a stretch, you must do the following.

1. Step 1. A visual inspection is required to assess the degree of damage to the structure, the distance between the deformed areas, material and surface quality.
2. Step 2. Take a set of guy wires and perform the assembly: connecting the hydraulic cylinder and the hose. Use an extension cord if necessary.
3. Step 3. The assembled structure must be secured in a stable position so that it does not slip. To do this, use the appropriate attachments provided in the repair kit.
4. Step 4. After installing the structure, press on the pump to firmly fix and stop the unit.
5. Step 5. To straighten the element, use a pump to create forces that will straighten it.

If the part is badly damaged, the dressing procedure should be repeated. Stretching must be applied carefully so as not to further damage the car body.

To straighten the frame and body geometry, special equipment is used - a slipway. Stacking is the most difficult and time-consuming process in the field of car repair. With the help of the slipway, both minor damage and rather complex ones associated with the restoration of the body geometry are corrected. Not a single auto repair shop and service station can do without a slipway. Many car enthusiasts have in their garage a homemade slipway for body repair.

The construction of the slipway for car repair has a pneumohydraulic pump. This tool is used not only during the work of the slipway, but also with other garage tools: presses, stretch marks, etc. The design features of the pneumohydraulic pump ensure its advantages during operation:

• high productivity;
• lightness and ease of use;
• simple mechanism for checking and replenishing the oil level;
• a fuse protects the tool against overload during operation.

Many models are equipped with mufflers that provide a low-noise operation of the mechanism. The use of a pneumohydraulic pump in body repairs greatly speeds up and facilitates the process.

A tool that is indispensable when carrying out repair work in the garage and on the road - a jack. It is used in cases when it is necessary to raise the car during repairs. The jack is indispensable as a luggage tool, without which it is impossible to replace a wheel in case of a puncture on the road. When choosing a jack, you should pay attention to its main characteristics.

1. Lifting capacity - shows the maximum weight that this equipment can lift. Buy a jack based on the weight of your vehicle.
2. Lift height - the distance between the support and the pick-up at the maximum stem exit.
3. The dimensions and weight of the unit matter, as it will have to be carried in the trunk.

Increasingly, a pneumohydraulic jack is used for work in the garage associated with straightening vehicle elements. This is a hybrid unit in which pneumatic and hydraulic mechanisms are connected. These jacks lift the load by supplying a special oil, which is pumped into the system using air.

This type of lifting device is designed for stationary use. A pneumohydraulic jack allows you to eliminate some of the disadvantages of hydraulic devices - slowness and high pickup height.The advantages of such units also include:

• high carrying capacity;
• little effort;
• can be used on any soil (uneven, loose, etc.);
• ease of use.

In order not to get injured when working with the jack, do not damage your car or break the tool itself, follow simple rules.

1. First of all, read the instructions for use of the air hydraulic jack.
2. Before each use of the unit, check for oil leaks, damaged or loose parts.
3. Bleed air from the hydraulic system before starting work.
4. Do not use the unit to move the vehicle.
5. Do not exceed the carrying capacity.
6. Do not use the jack as the only support.
7. When replacing parts, it is advisable to use original spare parts.

Following these recommendations will ensure your safety during repair work and will increase the duration of use of the lifting equipment.

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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.

1. 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.
2. 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.
3. Cable damage has occurredunder water. Remove the device and check the cord.
4. 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.

1. 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.
2. 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.
3. Stuck check valve... In this case, it is required to disassemble the valve and clean it, if necessary replace it with a new one.
4. 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.

During the operation of pumps from different manufacturers, it was noticed that some brands of devices are often subject to the same breakdowns. It follows from this that these models of units have their own distinctive features in terms of the occurrence of malfunctions.

Pumps "Aquarius" have overheating predisposition, especially if they work in shallow wells. If a cheap model breaks down, its repair costs about 50% of the cost of a new device. If the device is out of order, it is easier to throw it away than to repair it.

Most of the models of this manufacturer have valve system... There is also a special thermal insulation around the engine. Sometimes pump malfunctions occur due to the failure of the listed parts. Since the thermal insulator is located around the engine, it will need to be removed from the housing for repairs.

Devices "Malysh" are products of domestic manufacturers. The cost of repairing units of this brand is not high, and the owners of the devices eliminate most of the breakdowns with their own hands. The main failure often encountered in this pump is loud noise when operating the hydraulic machine without pumping out the liquid. This behavior of the apparatus means that there has been a rupture of the central axis holding the armature and the membrane.

The engine in pumps of vortex and rotary type "Dzhileks" is oil-filled. Therefore, a frequent breakdown of these units is leaking oil from the engine... It can only be refilled at a service center.

Important! Many on the Internet advise using transformer oil or ordinary glycerin instead of the original oil filler. Doing this is highly discouraged, of course, unless you have set yourself a goal to spoil the technique in an unusual way.

There is an opinion that the operation of the trickle drainage pumps can continue without interruption for 7 hours or more. This is explained by the peculiarity of their design, which meets all European standards. But despite this, the apparatus exposed to overheating as well as pumps from other manufacturers. Therefore, it is recommended to give it time to “rest” after every 2-3 hours of operation.

Owners of the pump for the "Markus" well sometimes notice that the device turns on only after a slight blow either on the pipe going to it, or after hitting the hydraulic machine itself. This malfunction is explained by “souring "impeller, which will have to be cleaned by disassembling the unit.

In the event of pump breakdowns requiring replacement of parts located inside its housing, disassembly of the unit will be required. The submersible pump consists of a compartment for the engine and a compartment with one or more impellers, the purpose of which is to capture water... Below is a diagram of the device of that part of the centrifugal pump where the impellers are installed.

As you can see from the figure, the impellers are mounted on the unit shaft. The more there are, the higher the pressure generated by the pump. In the second compartment of the hydraulic machine is located rotary engine. It is located in a sealed case, and in order to open it, you need to know some of the nuances.

So, to go from theory to practice and disassemble the pump, follow these steps (depending on the manufacturer, the design of the unit may differ).

Unscrew the 2 screws holding the mesh of the device.

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.

1. 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.
2. Turbid oil - water has entered the engine housing due to a crack in the housing or failure of the oil seal (cuff).
3. 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.