Staged repair of hydraulic jacks 5 tons. Hydraulic jack: a device, how to pump with your own hands and the principle of operation. Entry of air bubbles

Many car owners, and not only them, are thinking about the question of how to repair a hydraulic jack with their own hands without going to a workshop.

The hydraulic jack is a portable cargo lifting device designed for heavy items.

A jack is one of the most important tools, you can’t do without it, for example, when repairing a car. With the help of a jack, the body of the machine is raised to a sufficient height so that repairs can be carried out.

Specifics of work and types of hydraulic jacks

One of the reasons for the popularity of hydraulic jacks is the stability of the structure. Because of this, they are able to lift a larger load than mechanical ones. The lifting capacity of the jack depends on the model and can be up to 200 tons. The hydraulic jack works more smoothly, braking is more accurate. The efficiency of this tool is much higher than that of mechanical models- up to 80%.

From the name it is clear that the main component of the design is a special working fluid that acts on the rod, and as a result it moves. Oil is used as a working fluid, therefore, for the operation of the device, it is necessary to periodically evaluate the condition of the valves, seals and the entire system as a whole, and check for the presence of oil.

By design, the tools are:

• two-plunger;
• single-plunger.

Causes of jack failures

The use of high-quality working fluid and regular checks of the condition of the hydraulic unit can guarantee its trouble-free operation for quite a long time. But even high-quality devices are not immune from breakdowns.

There are only two main reasons for the malfunction of the jack:

• obstacle to lowering the mechanism;
• stem deformation.

In the first case, the problems are caused by the formation of rust inside the device, which begins to interfere with the free movement of the mechanism. Protective elements, gaskets or balls may be worn out on the valve and piston, which will also cause the mechanism to jam.

Another common cause of problems is misuse. Hydraulic jacks require special handling. The instructions say that they can only be transported in vertical position, but this is not always possible. As a result, gradually the working fluid begins to flow out, instead of it, air penetrates into the device. All this leads to a decrease in the efficiency of the jack, and then a complete stop of the hydraulics. Breakdowns caused by the factors listed above are easy to repair on your own.

Stem deformation often occurs during continuous operation of the device. The reason is that the load limit has been exceeded. In this case, the stem is deformed and does not pass through the coupling. Repair of the device in case of such a breakdown involves the replacement of the stem. It is useless to level the old deformed rod, since it is made of a special grade of steel, it is almost impossible to try to shape it at home.

Both causes of breakdowns are quite easy to eliminate, the main thing is to know the basic principle of disassembling and repairing the device.

Hydraulic jack repair

Before proceeding with the repair, you need to accurately determine the cause of the breakdown. To do this, the jack must be disassembled. Since all parts are fastened with a threaded connection of different diameters, you will have to use a set of keys different size. After the device has been completely disassembled, you need to carefully drain the oil from it and inspect the valve and pistons well.

If rust has accumulated on the parts, it must be cleaned. The stem must be carefully checked for bending. Protective gaskets and rings should be replaced with new ones, because their deformation and wear may not be visible, and the quality should be checked at high pressure. After checking, all parts must be washed well with a special liquid, preferably more than once. The jack remains to be pumped to remove excess air and pour new oil into it. For filling the working fluid, a neck with a screw plug is provided.

According to the type of drive, hydraulic jacks are distinguished:

• with manual drive;
• with electric drive.

Even though there are different types this tool, the principle of operation is the same for all models.

After that, the structure is reassembled, and the process of repairing the jack is considered complete. It remains only to check the quality of the tool. If a hydraulic jack works normally, means the repair is completed successfully. If not, you'll have to keep looking for the problem. Most often, the normal functioning of the device can be interfered with by poor-quality or incorrectly filled oil.

Steps for refueling a hydraulic jack

This stage is not always given due attention, and completely in vain. The working fluid is driving force devices. It acts on the stem so that it becomes in desired position. If there is not enough oil, the jack will not work properly.

Before filling the oil, you must first drain the old one. Then thoroughly rinse the "insides" of the instrument using flushing fluid. You can buy it at construction stores. Flushing the jack is a rather laborious process, especially for a beginner. You will have to fill in the liquid at least two times, while constantly pumping the jack. Do the same with old oil. Not a single drop of the old working fluid should remain inside the tool.

Thanks to these qualities, the hydraulic jack has become widespread among motorists and car repair workers. In addition, it is also used in other types of work, for example, in construction when lifting reinforcing or reinforced concrete structures. More complex structure hydraulic jack in comparison with a mechanical jack leads to the fact that its repair is much more complicated, but when carrying out repairs, you can do without contacting the master. In order to properly repair the tool, you need to in general terms learn how it works.

Then the jack must be set to a low position. To do this, turn the screw valve to the "drain" mark. The cork is twisted. The jack is pumped five times, after which you can fill in oil until the level rises to a special mark. Then the cork is twisted again. The operation is repeated until bubbles no longer appear on the surface, and the amount of oil reaches the set level.

Repairing a jack is a rather laborious procedure than a complicated one. But still best repair- this is the prevention of breakdowns, because it will take precious time and effort to eliminate them. If you follow the recommendations of the masters, you can significantly extend the period of maintenance-free operation of the hydraulic jack.

The quality of the device depends largely on the quality of the working fluid. Therefore, it is worth purchasing oil only of high quality, from reliable suppliers and designed specifically for technical equipment. The type of oil can be any, but for the smooth operation of the device in winter time it is worth additionally purchasing a synthetic solution.

In general, it is not recommended to use the tool in cold weather, except in an emergency and for a short time, otherwise the risk of malfunctions will increase. Regardless of the season, the hydraulic jack should only be stored in a warm place, otherwise the device will freeze and breakage will occur. If the jack is used infrequently, then it is enough to replace it once a year. But with constant operation, you need to check the condition of the pump every month, change the oil and flush the mechanism each time.

Oil change work should be carried out only after the entire load has been removed. The repaired tool may only be used after complete assembly.

Repairing a hydraulic jack is not particularly difficult, the main thing is to follow the instructions correctly and perform each stage of work with high quality.

Of great importance for the normal functioning of the tool is the quality of the working fluid, which you need to purchase only from well-known manufacturers. following simple recommendations operation will minimize the risk of breakdowns and extend the life of the tool.

To lift small equipment, such as a car to change a wheel, there is no need to involve special equipment. For this purpose, a lift is used. There are many varieties of such a device. Each of them has its own advantages and disadvantages. Regardless of the cost of the device, it is not protected from breakdowns. You can repair the hydraulic jack yourself if you follow a certain sequence during operation.

Hydraulic jack device (rolling and bottle)

The most popular types of hydraulic lift are rolling and bottle. Such devices have their own design features. So the device of a hydraulic bottle jack includes a handle, a pump, a cylinder, a reservoir, a stem, a valve and a screw.

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The layout of the hydraulic bottle jack is as follows:

• The suction valve is located on the reservoir nozzle. Due to this, when lifting the jack, the hydraulic fluid does not leave the cylinder.
• The valve is opened with a special screw. Due to this, the pressure level in the device is reduced, and the lifted load falls to the ground.

The cylindrical fluid is especially important, because it is thanks to it that the load can be smoothly raised / lowered, as well as held at a certain height. It contains spindle oil, water and alcohol.

The principle of operation of a hydraulic jack is that the car is lifted by a horizontal rod resting against a special vertical mechanism. A lifting platform is attached to it, which is responsible for lifting the equipment. To lower the raised device, open special valve, after which air is pumped out of the system. Due to the decrease in pressure, a lowering occurs.

Types of breakdowns and their causes (why the jack does not hold)

Most often, the hydraulic jack fails if it is overloaded (to lift loads with it, the mass of which exceeds the maximum for the device), or there are malfunctions in the hydraulics.

The failure in the first case is due to the fact that the thrust rod is deformed. As a result, it bends and cannot pass through the coupling, which leads to its jamming. To restore the functions of the device, it is necessary to replace the stem. The fact is that it is made of special steel, which cannot be leveled.

But hydraulics can fail for several reasons at once:

• The machine oil used instead of the operating fluid leaks out when the lift is stored in the wrong position. As a result, the oil flows out and is replaced by air. Therefore, the operation of the device gradually slows down or stops altogether.
• The inner surface of the hydraulic system is rusting. This leads to the fact that the free movement of the device is disturbed.

Such problems are usually not serious, so you can fix them yourself at home. However, repair of hydraulic jacks is sometimes not possible, so it is easier to purchase a new device.

Do-it-yourself hydraulic jack repair, selection of spare parts

When repairing a hydraulic jack with your own hands, it must be borne in mind that all constituent elements devices are fastened with threaded connections. Therefore, before starting repairs, the device must be disassembled.

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Repair kit for hydraulic bottle jack includes spanners and wrench. Then you should follow this sequence of actions:

1. Drain the oil into a prepared container.
2. Remove the piston and valve and inspect them carefully. If necessary, both elements are cleaned of rust accumulated on them.

1. Check the support rod for bending. most frequent malfunction is that the hydraulic jack does not lift the load. In this case, the support rod may be deformed and must be replaced.
2. In addition, it is necessary to pay attention to the condition of the gaskets. If one of structural elements deformed, in this case it will be possible to repair the hydraulic jack by replacing the broken part. Even if outwardly the gaskets seem to be intact, it is recommended to replace them - often the damage is not noticeable to the eye.
3. If oil is leaking, then most likely the oil valve needs to be cleaned of dirt. Indeed, because of its appearance, the ball does not sit well in its nest.

Do-it-yourself repair of a hydraulic rolling jack ends with washing all parts with a special liquid. Then you should assemble them in reverse order. Before disassembling the device, it will not be clear what exactly led to its breakdown. Therefore, in principle, all types of faults are corrected according to one algorithm, however, in different occasions various parts need to be replaced.

When selecting spare parts, it must be taken into account that they must fully correspond to the deformed parts.

How to fill in oil

Necessarily repair of jacks ends with the renewal of the working fluid. Before pouring oil into the hydraulic jack, you need to check that the air is completely bled. Otherwise, after that, the system will not work at full capacity. How to pump a hydraulic jack?

To do this, turn the outlet valve counterclockwise. The device must be fully lowered. You can pump the hydraulic rolling jack yourself without using additional tools.

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Then you should find a hole designed to fill the oil. It is located on the tank in which the hydraulic fluid is stored. Remove the bolt from the filler neck, insert the nozzle and pour oil. When the liquid begins to flow out, you need to stop pouring it.

Tips for the correct operation of the jack for 5 and 12 tons

In order not to have to repair the rolling jack with your own hands, it must be properly operated. You can not lift with it a load exceeding the maximum allowable - 5, 10 or 12 tons.

Loads should be lifted smoothly, without jerks. Before climbing under the car, you need to make sure that it is stable. Otherwise, the car may fall on a person, resulting in injury.

The operation of a hydraulic jack is based on the principle of a mechanical jack. As a result of these laws, applying a small force to the handle of the jack, you can get a lot of force on its rod.

Consider the design of the jack in more detail.

The most important elements of the jack are 1, pump plunger 2, piston 3, rod 4, check valves 5 and 6, bypass valve 7, working fluid container 8.

Consider the principle of operation of a manual hydraulic jack in stages.

When moving up, the lever 1 carries along the pump plunger 2, creating a small vacuum in the cavity 8. Due to this vacuum, the valve 5 opens and the valve 6 closes. The increased volume of the chamber under the plunger is filled with liquid from container 8, which enters through 5.

Moving down, the lever 1 acts on the plunger 2, which also moves down, reducing the volume of the working chamber and increasing it. Under the action of pressure, valve 5 closes, valve 6 opens, and the working fluid rushes into the cavity under piston 3, forcing it to move upward.

After that, the cycle is repeated, the lever moves up, the pump cavity is filled, down - the liquid is displaced under the piston.

Under these conditions, the liquid is incompressible, which means that the amount of displacement of the piston 3 will depend on the volume displaced by the plunger 2. The figure shows that the volume displaced by the plunger is small, which means that the piston will move by a small amount. However, the force with which the piston 3, with the rod 4 attached to it, will be many times higher than what was applied.

If the jack rod needs to be moved down, then the bypass valve opens, and the piston moves down under the action of gravity, and the liquid from under it into the container 8.

Due to what there is an increase in the force in the hydraulic jack

As noted earlier, the force in the hydraulic jack is enhanced by mechanical and hydraulic levers, let's consider this in our example.

According to the lever rule: F2=F1*l1/l2

That is, if the arm l1 is three times greater than l2, then the force applied to the plunger F2 will be three times greater than that which was applied to the handle. But this is only the first stage of strengthening in a hydraulic jack.

The second stage is based on the principle of a hydraulic lever, according to which: F3=F2*Spor/Splun

Where Spor and Splun are the areas of the piston and plunger, respectively. That is, if the plunger diameter is 4 times smaller than the piston diameter, then the force on the piston with the rod will be 4 ^ 2 = 16 times greater than that applied to the plunger. As a result, we get that the initial effort has increased by 16 * 3 = 48 times. And this is not the limit. I increase the difference in the length of the lever or in the ratio of the pump plunger and the output piston, you can increase the ratio of efforts.

Hydraulic lift device

In the considered example, several essential elements hydraulic drive:

• the cavity with the pump plunger and valves is a piston pump
• a piston with a rod located in a cylindrical cavity -
• container with liquid - tank

These elements can be placed separately, then change design features, the purpose of the jack, but the principle of its operation will remain unchanged. Let's change the layout of the manual jack and get a lift for the repair shop.

Piston pump, can be replaced with. The pump is driven by an electric motor.

Working fluid in the sleeves high pressure will flow to the hydraulic cylinders located in the guide bearings. A hydraulic distributor is used to control the movement of hydraulic cylinders. A safety valve is used to protect the system from overload.

The principle of operation of the lift

In the neutral position of the distributor, the liquid is sent through to the drain. When switching the distributor, fluid under pressure will begin to flow under the pistons of the hydraulic cylinders, forcing them to move up. When the distributor is switched to neutral, the cylinder cavities will be locked, the cylinder rods will be stationary (use to prevent movement due to leakage).

When the distributor is switched to the third position, the liquid will begin to flow into the rod end of the hydraulic cylinder, forcing it to move down.

Hydraulic jacks differ from their mechanical counterparts primarily in the amount of physical effort applied by a person to perform the same work. So, when working with hydraulics, these efforts are many times less, even if their drive is powered by human muscular strength.

The capabilities of hydraulic jacks are strikingly different from the capabilities of both mechanical and pneumatic counterparts. Key Features:

• carrying capacity from 1.5 to 200 tons (in some cases - up to 1000 tons);
• high efficiency - close to 80%;
• small working force;
• smooth running;
• high structural rigidity.

The disadvantages of most hydraulic jacks include the initially large height of most devices and the need for maintenance during operation.

We will consider the device and principle of operation of a hydraulic jack using the example of their most common type - a bottle plunger hydraulic jack. They come in different lifting capacities -3t, 5t, 10t, etc.

Everything is quite simple: there is a piston in the cylinder and either in a separate reservoir or in the same cylinder above the piston there is hydraulic oil - the working fluid of the jack.

The plunger actuates the hydraulic jack - small pump, forcing oil through the bypass valve into the cavity under the piston. Due to the difference in the diameters of the plunger and the cylinder of the jack, the applied force is minimized. The fluid pumped under the piston pushes it out, lifting the load above it.

Lowering the jack is done by slowly bleeding the hydraulic oil from under the piston into upper part cylinder or tank.

This is the principle of operation of all hydraulic jacks.

Another thing is that not all of them are equipped with a plunger pump, and both a separate hand-held device connected to a jack and a hydraulic station can act as a plunger.

And now is the time to consider in more detail the types of hydraulic jacks, places and methods of their application.

Varieties of hydraulic jacks, their advantages and disadvantages

The first of these, the most common and well-known, are bottle-type jacks, they are often (according to the most classic application) called automobile hydraulic jacks.

Their line for most manufacturers starts from one and a half tons and reaches 15 - 20-ton modifications. They are simple in design, compact in laying and unpretentious in maintenance, they are able to faithfully serve a zealous car owner for many years.

Actually, Maintenance, in most cases, comes down to checking the oil level, topping it up if necessary, and periodically idling the jack so that during operation all its parts can be lubricated, the springs work and the bypass valve balls turn, which will prevent them from sticking due to rare use and will not lead to the inoperability of the device in a critical situation.

Just because of the possibility of oil leakage, it is better to store bottle hydraulic jacks in an upright position.

Repair of such jacks is extremely rare, but if the jack is worn out - for example, at a service station or in another production, then it most often comes down to replacing the piston and plunger cuffs, rubber seals, less often - springs and bypass valve balls.

Advantages of the hydraulic bottle jack:

• compactness;
• stability;
• durability;
• low applied force;
• versatility of use - in addition to vehicles, such jacks are used in construction, on railway transport, as a power unit for pipe benders and pipe cutters;
• ease of repair.

It is these jacks that are the main and practically uncontested on trucks.

Their disadvantages include:

• high initial height;
• low lift height
• inability to work in a non-vertical position.

Now automobile hydraulic jacks are produced in a convenient compact package, which makes their packing and storage in a car, especially on long trips, very convenient and neat, preventing damage to things carried in the luggage compartment by possible oil ingress.

By the way, the shape of the drawers and the arrangement of the handles transparently hint at the vertical storage of bottle-type jacks. But a rolling hydraulic jack is devoid of these shortcomings, although it is both more expensive and less compact, but as a car jack it is not inferior to a bottle jack, and in some cases even surpasses it, in particular:

• when working on sites with a slope;
• has a significantly lower pickup height;
• easier to move and install under the car thanks to the wheels;
• has a higher lifting height (from 300 to 400 mm).

Another, in our opinion, interesting model of a car jack was created on the combination of two types of this device: rhombic screw and hydraulic. This is, of course, a hydraulic jack, but its force is transmitted with the help of levers to a rhombic lifting device, which has undeniable advantages:

• low pickup height;
• absence of deviations in the vertical plane during lifting;
• high lifting height.

We will be wrong if we do not mention some of the less well-known, but no less useful representatives of hydraulic jacks.

Choosing a hydraulic jack for your purposes

In addition to purely automotive, or rather, predominantly automotive, there are other hydraulic jacks that not only push the piston, but also retract it.

Moreover, they can do this both on one side and on both sides. These and similar jacks are most widely used in car body repair or similar industries.

They usually do not have their own plunger and are used with an external oil pump, either manual or electric.

Same external device you also need hydraulic jacks with a stepped lifting height or with fixation with a nut.

These are specific jacks, more often used in production, but in the conditions of a car repair shop, occupied incl. repair of trucks, they can become indispensable assistants considering them:

• exceptional reliability and durability;
• high (significantly greater than that of bottle hydraulic jacks) load capacity;
• no need for additional fixation of the cargo;
• no need for human effort when lifting at all.

It remains in this section to mention one more, somewhat specific and not particularly familiar to most users, the type of hydraulic jack - a hydropneumatic jack.

Actually, often it also has a plunger for purely mechanical work, but is also equipped with a pneumatic drive for pumping oil. It is convenient to use it either in a garage equipped with a compressor, or on a car equipped with the same device.

In addition, our chinese friends they already offer an attachment to a conventional bottle hydraulic jack, which turns it into a hydropneumatic one.

As you can see, both the scope of hydraulic jacks and the choice of options for their execution are more than wide. Therefore, finally, about one of the most common homemade products using a hydraulic jack - the press.

Uncomplicated in technical terms and easy to self-manufacturing accessories will help turn your hydraulic jack into a very useful tool. household installation. In the garage, she will help you press in and out bearings and silent blocks, in the home workshop - glue wooden blocks into a strong canvas and bind an old, but very valuable book.

She can even squeeze the juice from the fruits from your garden if you have the appropriate containers.

There may be others Constructive decisions your home press, but the main mover is a hydraulic jack. And it also seems to us that the design of such a simple pipe bender can lead a thoughtful reader with an engineering mindset to very productive thoughts.

And if this happens, we hope you will share this with the subscribers of our site.

Dear readers, if you still have questions, ask them using the form below. We will be glad to communicate with you;)

The jack has become quite widespread. They are in the arsenal of almost every motorist, they can come in handy when conducting various work in a workshop. There are several varieties of such a mechanism, in this case we will pay attention to the hydraulic one. Such a tool transmits force by compressing a fluid. The complexity of the mechanism and its use in difficult operating conditions determines the need for repairs. You can repair the hydraulic structure with your own hands, but you should take into account all the features of such a process. Consider how to repair a hydraulic jack and what the features of this process may be.

Causes of jack failures

The design of a hydraulic jack can vary significantly. Many professional models can last for a long period, but still certain reasons can lead to a serious defect.

Malfunctions of the hydraulic jack can be associated with the following problems:

1. Most often, the working cylinder fails, as well as the plunger mirrors. Such a malfunction leads to the fact that the working part does not hold pressure, oil penetrates from the working chamber into the over-piston space. In this case, there are quite a few problems with the use of the device.
2. In most cases, damage to mirrors occurs due to negligence during operation. The hydraulics do not work in this case or have low efficiency. The surface is damaged due to transport in a horizontal position, if this is not foreseen by the manufacturer.
3. Too serious damage to the surface of the mirrors leads to the fact that the liquid begins to flow out, air enters the cavity, due to which corrosion begins to actively develop.
4. Corrosion on the surface causes rapid wear of various seals and cuffs. In their manufacture, rubber is used, which is subject to mechanical impact. As a result of deformation and severe wear, a large number of foreign elements enter the oil, which lead to clogging. installed valves and channels.
5. Mechanical impact, for example, at the time the device falls from a great height, also causes a large number problems. Too strong impact can lead to the appearance of internal or surface deformations of the body, the curvature of the main elements.
6. Excessive load may cause damage to the mechanism. A common problem can be called the curvature of the rod, due to which the chamber also begins to let oil through due to the skew of the main element. Each model of the lifting mechanism is designed for a specific load, which is indicated in the instruction manual.
7. Inappropriate use also leads to major malfunctions. Use a hydraulic jack only on the basis of the manufacturer's recommendations.

Many causes of failure of the lifting mechanism are the result of improper use of the device. In addition, maintenance of some models of hydraulic jacks provides for periodic oil changes. These and many other points are taken into account when considering the operating instructions.

Necessary tools and materials

Do-it-yourself repair of a hydraulic jack can be carried out in your own workshop if you have the required materials and tools. It should be borne in mind that some versions of the lifting mechanism are represented by non-separable structures, and it will be quite difficult to carry out repair work. The hydraulic jack should be disassembled taking into account the features of its design. This may require the following tools:

1. Hammer and chisel.
2. Pliers.
3. Screwdrivers of various diameters.
4. Hacksaw.
5. A set of keys and a gas key.

There are simply a huge number of varieties of hydraulic jacks, so it’s difficult to say exactly which tools you may need to get the job done. In some cases, it is possible to easily access the internal mechanism for maintenance or repair, in others it will take quite a lot of free time to disassemble.

As for materials, it all depends on what kind of malfunction the structure has. very often seals that are made of plastic or rubber fail. With their selection, quite a lot of difficulties can arise, since even a small gap can lead to the passage of the working fluid into the upper chamber (lead to a pressure drop). If we consider damage to the stem or glass, then such malfunctions are solved only by replacing the entire element.

When considering how to disassemble a hydraulic jack, you need to pay attention to the design features. The force in all cases is transmitted through the oil, which has a low compression ratio. As noted earlier, in order to long service life If the device is used frequently, the oil should be changed, as it may lose its performance over time.

The device of a rolling jack does not differ significantly from a conventional thrust jack. The working part was carried out using similar principles. It should be borne in mind that the design largely depends on what the load capacity is. Some models are equipped with a threaded extension that allows you to initially adjust the initial lifting height.

Do-it-yourself hydraulic jack can be repaired in case of malfunction of auxiliary elements or the main working part. In most cases, problems arise with the working part. Classic variant execution is represented by a combination of the following elements:

1. A piston that has o-rings. It is on him that the pressure of the liquid is applied. Through the combination huge amount seals from various materials the piston does not let oil through even when high pressure occurs. In addition, the design itself is designed for high loads. The use of rubber seals allows you to make the element movable.
2. Cylinder with seals. It is the cylinder that creates the working cavity in which pressure is exerted on the rod. In order to reduce friction during the course of the moving element, the surface is polished to a mirror state. In the manufacture of this element, materials with high corrosion properties are used. The appearance of even insignificant rust leads to the fact that the moving part begins to wear out quickly. Outside, the cylinder is represented by cast iron, which is very susceptible to shock loading. Therefore, you should handle the tool in question carefully.
3. Power stock. This element is connected to the piston, set in motion. It is the rod that takes the load that occurs between the lifted object and the piston. Manufactured using high-quality steel, designed for high loads. To prolong its service life, the surface is chemical treatment to provide corrosion resistance. It should be borne in mind that when using a hydraulic jack in violation of the operating recommendations related to permissible loads, the rod is bent. This type of error is extremely common.
4. Throughput systems. In order to supply and remove oil from the working chamber, passage channels are required. They have small size, may become clogged over time.
5. A plunger pump that provides pressure. Most of the mechanical type devices provide for manual pumping of fluid into the work area. The plunger pump device is characterized by high reliability, rarely fails.
6. The bleed valve is used to remove liquid from the working chamber. Such a structural element can be implemented in various ways. As a rule, this is a small screw, when turned, due to the pressure exerted on the rod, all liquid is removed from the working chamber.
7. Cuffs and seals. These elements provide insulation of the working chamber and other structural elements. They also provide mobility to the piston rod. In the manufacture of cuffs and seals are used plastic materials, characterized by high resistance to mechanical stress or the effects of the oil used. Important indicators seals is their outer and seat diameter, as well as rigidity and wear resistance. Find suitable option performance for replacement in many cases is quite difficult.
8. Filler hole to maintain the required oil level in the system. From time to time it is necessary to add oil to maintain the required level. As a rule, when the hydraulic jack is used intensively or transported in the wrong position, the level of the working fluid drops. Some models of the device have an oil level indicator.

In general, we can say that the design is quite simple, but it has a lot of rubbing elements. Many manufacturers create collapsible designs when the seals on the stem are fixed with a nut or other fastener. It should be borne in mind that there are also non-separable versions, the repair of which is several times more complicated.

Jack repair in most cases is quite simple if you have the necessary Supplies. It should be borne in mind that the appearance of corrosion on the surface can significantly complicate the task. Therefore, you need to buy special liquid to remove corrosion and oxidation.

Do-it-yourself repair of a rolling hydraulic jack can be conditionally divided into several main stages:

1. The essence of the problem is determined. If the design does not hold pressure, then the seals are likely to wear out. In the case when lifting occurs with difficulty, then there is a possibility of stem deformation or other problems.
2. Held complete analysis designs. At this stage, the main thing is not to damage the fasteners. It is worth remembering that during the supply of pressure, the working cavity must contain it. Even a minor defect can cause leakage and pressure drop.
3. Inspection of the integrity of the main elements is carried out. In most cases, you can determine the cause of the problem by visual inspection designs. For example, seals may have recesses, grooves and other deformations, a slight bend in the stem, channels with low throughput due to the accumulation of soot and dirt.
4. After determining the cause of the malfunction, the rolling jack can be repaired.

In most cases, a hydraulic jack can be repaired as follows:

1. After disassembling the structure, the internal cavity is cleaned of various debris. In addition, you will have to completely replace the oil used.
2. Seals can be removed in various ways. As a rule, there is a fixing element, which ensures the immobility of the rubber bands during operation of the device. It is worth considering the sequence of the location of the rubber bands and seals various types. Incorrect installation may result in the device not holding pressure.

As previously noted, the curvature of the stem and damage to the mirror surface cannot be corrected independently. Too much wear leads to the fact that it is necessary to replace the entire element or the lifting mechanism itself.

The hydraulic bottle jack has even more simple design. As a rule, it does not require any adjustments. Therefore, after its assembly, you can begin testing and subsequent operation, provided there are no problems. Some manufacturers lifting mechanisms indicate instructions on how to disassemble the device and carry out repairs. Its use makes it possible to significantly simplify the task.

A repaired hydraulic jack should first be checked for proper operation. This is due to the fact that frequent use with improper installation of seals or other errors will lead to rapid wear of the main elements. Therefore, insurance should be provided in case of lifting the car or other mechanisms. At proper conduct repair work can significantly extend the service life of the hydraulic jack.