Jack rolling matrix 3t DIY repair

In detail: jack of a rolling matrix 3t DIY repair from a real master for the site my.housecope.com.

A jack is a tool with which different loads are lifted to different heights. The principle of operation and the device may differ. The most common type of jacks used in auto services and private garages is a hydraulic trolley jack, we will now analyze its device.

The trolley hydraulic jack is a trolley on wheels. This type is very convenient in operation, it has a large lifting capacity and smooth lifting. The hydraulic drive is at the heart of the operating principle.

To raise the car to the desired height, roll up the jack under it, place the bearing stop at the point of the car body intended for lifting. There are special places on the body of the car where you need to rest the jack. The next step is to swing the handle up and down, the bearing stop should begin to rise, and with it the car.

The main design element is hydraulic cylinders, pumping the handle, a certain pressure is created in the cylinders, due to which the lifting is carried out. The main work, lifting, is performed by the plunger and the straight valve. By turning the handle of the check valve, the pressure in the system will decrease, as a result of which the car will lower to its original position. In different models, the handle is located in different places, read the instructions for the rolling jack, everything is clearly stated there.

Carrying capacity... Carrying capacity starts from 2t and above. A simple passenger car for everyday needs will have enough carrying capacity of 2 tons. Such a tool does not take up much space, it can be stored in the garage and taken with you on a trip. If you have an SUV, a lifting capacity of 3t or more is recommended. In any case, it is better to know the weight of the car in advance, and be guided by its value in choosing.
Maximum lift height. It is different for each model. Owners of SUVs need to pay maximum attention to the parameter. It makes no sense to pay for a tool that raises the car by 2 cm. The maximum lift height for SUVs starts at 450 mm.
Minimum height. The parameter determines the ability to roll the device under the car. A rolling jack with a minimum height greater than the ground clearance of your car is not your assistant. Be sure to measure the ground clearance (clearance) before choosing.
Ease of use. Rubber pad on the bearing stop.
Mechanism drive type. Cardan and toothed. Recommended cardan type, it has proven its reliability and is also more repairable.

Video (click to play).

The main advantages of sliding hydraulic jacks:

Minimal effort to lift large weights.
The horizontal arrangement of the cylinder, due to this, a high load capacity is achieved.
The rise is carried out smoothly.
A stable support platform ensures safe working.
It is very convenient in operation, the operator does not need to crawl under the car.

Disadvantages of rolling jacks:

The lifting speed leaves much to be desired, it is critical for cars with high ground clearance (ground clearance).
With continuous load, there is a drawdown due to a drop in pressure in the system.
When used in low temperature environments, the liquid may freeze.
To ensure long-term performance, preventative maintenance should be carried out.
Low lifting height compared to other types of jacks.

Breakage as a whole, the working rod does not rise;
The hydraulic rolling jack does not hold the load;
Malfunctions when lifting a load;
Leaks in places of seals;

You can repair hydraulic sliding jacks yourself, with your own hands. You will need a repair kit, or the purchase of spare parts. Most often, gaskets and various seals fail, as a result of which oily smudges appear on the body.

The first point of repair you need to drain the oil into a previously prepared container. It is not recommended to reuse, it is better to fill in a new one. What to fill is indicated in the instructions for the rolling jack. Ordinary engine oil or hydraulic oil is usually suitable. It is better to use those that do not interact with rubber parts.

The second point of repair we proceed to the disassembly stage. We remove the pistons and examine them for plaque, dirt and rust. Having identified contamination and rust, we eliminate them. To do this, you should use special dissolving liquids, gasoline, diesel fuel, white spirit. Having found plaque and corrosion inside, it is worth getting rid of the oil. There is no need to refill it, rust appeared for a reason.

If everything is in order with the pistons, we examine the shape of the rod. If it is crooked, that is very bad. Most likely, it can no longer be restored. It is necessary to prevent the curvature of the rod at the stage of operation without loading the rolling jack with a mass greater than it can lift. Be sure to read the instructions so that it will serve you longer.

Another malfunction, clogged valves. Often it is enough to simply clean or replace them.

When repairing a hydraulic rolling jack, replace all seals and gaskets. They come in a special repair kit sold in specialized stores. The last step is flushing, and then filling with fresh oil and pumping.

Open the fill hole. We drain all the oil into a container prepared in advance. Next, fill in the cleaning liquid. This procedure removes residual oil and other dirt from the system. Next, we go according to the following algorithm of actions:

Fill in the cleaning liquid.
We move the lever, the liquid spreads through the system.
Add liquid, swing the lever until the stem rises to the upper position.
Next, we open the check valve, the stem returns to its initial position, part of the cleaning liquid will be squeezed out of the system.
If the liquid being squeezed out is dirty, repeat the algorithm several times.

Having cleaned the system, we proceed to the oil filling procedure. Be sure to completely drain the cleaning liquid before starting. Bleeding is oil filling. It takes so much liquid so that it can lift a certain load to a certain height.

Leave the drain hole open
Fill in oil, operate the lever until the stem rises slightly
Refill and operate with the lever until the stem rises to the upper value
Open the shut-off valve, the stem will return to its original state, excess liquid will pour out of the hole
Drain hole, close. Wipe down the jack. Everything is ready.

Remember to keep track of the amount of oil. Check the rubber seals, it is recommended to change them from time to time. If there are leaks on the jack, then the seals should be replaced.

The hydraulic trolley jack is an excellent tool used in car services and garages of ordinary people. Its design is very convenient and efficient. It should be remembered that the jack is a lifting tool, not a holding tool. With long-term work, it is worth taking care of a reliable support.

When choosing a jack, pay attention to the lifting capacity, the minimum (necessarily less than the vehicle's ground clearance) and maximum lifting height. After the criteria are determined, we recommend buying a jack in the middle price category for individuals, and car services are advised to pay attention to a professional tool.

A jack is a special device with which a heavy load is lifted and fixed at the required height. This mechanism is simply irreplaceable when performing any car repair, for example, when changing a wheel.

Trolley hydraulic jack.

The most convenient and effective for work are hydraulic jacks, the working force of which is achieved using hydraulic oil and a piston. Assembly and repair of such a device can be done by hand.

The rolling jack belongs to the category of hydraulic ones, only it has a slightly different design. On its body, made of metal, two pairs of wheels are installed. In the holes located on it, a lifting mechanism and a hydraulic cylinder are mounted, which, when extended in the horizontal direction, lifts the platform. The device itself gradually raises the car to the desired height, while it rolls under it.

The jack is set in motion by swinging the lever and lowered by turning the valve screw. During the process of lowering the load, a tubular handle is pushed onto the valve screw, and after that the baffle enters its groove. When the handle rotates around its axis, the screw itself rotates accordingly. In this case, the pressure in the working cylinder is released, and the load is lowered to the desired height.

In order for the jack to serve for a long time, it is necessary to monitor the presence of oil in it and the condition of the oil seal and valves.

There are sliding hydraulic jacks used for personal purposes for vehicles with a weight category up to 3000 kg. Most often, such a device, equipped with the pedals necessary for preliminary lifting, is used in car services and tire stations. It can lift loads up to 4000 kg, doing the job quickly enough.

Jacks, which lift loads up to 20 tons and are equipped with pre-lifting pedals, as well as a sliding traverse, are designed to serve heavy machines and special vehicles. This mechanism also has its drawbacks, which include volumetric size and heavy weight, which makes it difficult to move it in a car. It requires a flat, horizontal surface such as asphalt or concrete to work.

wrench;
container for draining oil;
kerosene;
butter.

During the operation of the jack, its breakage may occur. The malfunctions of this device include oil leakage, jamming when lifting to a height, or, conversely, its refusal to descend. In any case, it should be repaired.

If the cause of the breakdown is oil leakage, then first you need to disassemble the device. Then the pistons are removed from it and checked for corrosion. After that, all dirt and the resulting corrosion are carefully removed. Next, the stock is checked. In the event that it is bent and deformed, the repair of the jack can be considered impractical.

The principle of operation of a hydraulic rolling jack.

When repairing a valve that allows oil to pass through, you need to unscrew it and check if dirt has got inside and if it has been deformed. In the event that it has undergone mechanical deformation, the valve should be replaced. If it gets dirty, then the working fluid will flow due to the fact that the ball has ceased to sit tightly in the seat. Therefore, first, the old working fluid (oil) is drained into the prepared container, while pumping the system with the lever, raising and lowering it.

Then all parts are thoroughly rinsed from trapped dirt, as well as from the remnants of old oil. In this case, it is imperative to replace all the cuffs, as well as the gaskets. If the dirt gets directly into the working cavity, then to remove it, you will need to unscrew the head of the case.

After that, kerosene is poured into its base, and the jack is pumped. In this case, the shut-off needle must be unscrewed. At the end, the kerosene is removed, and a clean working fluid is poured into the working cavity.

The efficiency of the jack may decrease due to the accumulation of air bubbles in its working cavity, which get there due to a lack of oil.

Repair in this case is carried out as follows. First you need to open the plug at the oil tank and the bypass valve. Then, at a fast pace, the pump of the hydraulic press is pumped several times so that the air from the working cavity moves into the container in which the oil is located. The oil tank opening and the bypass valve are then closed. If the whole process is done correctly, the jack will start working normally. With the remaining air in it, all actions are repeated again.If this device does not work or raises the load very slowly, then air can be removed from the working cavity in another way. To do this, the shut-off needle is turned one and a half or two turns. Then, with the help of a hand, the plunger rises by the screw, reaching the extreme upper point.

Like any equipment that carries huge loads, devices can often break down, and therefore you always need to know how to repair the jack yourself. To be fully armed at the time of a breakdown!

Any hydraulic jack operates on liquid, and the main elements of the jack are the body, piston and oil. If you decide to study how to carry out repairs yourself, you definitely need to know what reasons can lead to breakdowns. First of all, the structure of the device could be "attacked" by corrosion, which leads to restriction during the descent of the mechanism. Naturally, jacks often break due to too much stress, which leads to bending of the rods. Image - Jack rolling matrix 3t DIY repair

There are some other points, including the need to change the oil. However, any repair is carried out practically according to the same scheme. And the first thing you need to know is how to disassemble the device, after which you can start changing the fluid. The tool is disassembled in the following order:

Using wrenches, unscrew the fasteners;
Remove the fluid bleed valve and piston;
Carrying out a competent inspection, we check the quality of the valve and all gaskets - if you notice that they have become unusable, we just change the elements of the jack;
We clean the mechanism from debris and other foreign elements, rinse the cylinder;
We check and change the old rubber band if necessary;
The last step is to reassemble the tool in reverse order.

Naturally, after you assemble the jack, it should be checked for operability! If the device starts working, great, but it doesn't always work out the first time. Perhaps the oil is the problem?

Oil is the driving force of the device, it is this oil that presses on the piston, setting the rod to the desired position. Due to this, it is possible to lift almost any load. If there is not enough oil in the device, the mechanism will not work.Many who start repairs for the first time miss this moment, which ultimately leads to problems with the operation of the jack. Oil change instructions: Image - Jack rolling matrix 3t DIY repair

In order to fill the jack with oil, you must first unscrew the plug and drain the old fluid. The next step is to clean the mechanism with flushing fluid, which can be purchased at any hardware store. By the way, it is quite difficult to flush the jack completely, especially for a beginner, because you will have to fill in the liquid at least two or three times, after which the pumping is carried out, the liquid is added again and pumped again. The old oil is drained in the same way - so that not even a drop of old fluid remains inside the mechanism.

The container must be filled with oil to the end, that is, until the liquid reaches the required level. In this case, set the jack in a low position. To lower the stem to the lower position, be sure to turn the screw-cock until it reaches the “drain” position. Having tightened the plug, we carry out the pumping for five times, after which we add oil and tighten the plug again. There will not be enough oil every time during the cleaning process, and therefore it is necessary to pump it until the “fuel” of our jack reaches the required level, and bubbles stop appearing on the surface of the liquid.

As you have seen, repairing jacks with your own hands is a fairly simple job. However, of course, I do not want to bring it to repair work, because it takes both time and effort to implement. That is why we have compiled for you a selection of recommendations from experts. If you follow them, then the operation of your jack will become much easier, and repairs can be "pushed" further away. Image - Jack rolling matrix 3t DIY repair

In order for the oil change work to proceed efficiently and correctly, it is imperative to remove any loads, and the device itself can be started to operate only after you have completely completed all the work and assemble the jack;
It is advisable to change the "fuel" twice a year, and if you use the jack constantly, then at least once a month you need to carry out these works, and you must flush the entire mechanism every time;
You can choose any oil, but if you are going to use the device in the winter season, be sure to use a synthetic solution. This will allow the mechanism to always be in "full combat readiness" for work;
No matter what time of year it is outside, it will be better if you can store the tool in a dry and warm place, otherwise the oil may simply freeze;
If it is necessary to carry out work in the winter season, remember that too long work in the cold can lead to damage to the device, and therefore the operation of the jack is possible in the most extreme cases and for a short time.

If you work with these methods, you can significantly extend the life of the jack. And expensive repairs, which can cost you a significant amount, can be "postponed" indefinitely, which is good news!

Without a jack, a car enthusiast, without exaggeration, remains "like no hands." And it is needed not only to change a wheel on the road.
A good jack is indispensable for some types of repair work - especially in a regular garage that is not equipped with a lift. For example, when assembling the suspension after repair, when it is necessary to make the final tightening of the levers. There is absolutely no need to lower the car on wheels, so that the silent blocks take a "working" position - just jack up the lever to give it the desired position.
The sliding hydraulic jack is especially convenient - thanks to its design it is possible to install under the part located low, - so that no other jack can get under it.
But, like any other mechanism, the jack can fail.Repair of a rolling jack is available to anyone who repairs a car on their own.
Let's just talk about what you need to pay attention to first when repairing a rolling jack with your own hands.
First of all, let's take a look at its structure.

Diagram of the hydraulic jack

Professional rolling jacks differ in size and capacity. As a rule, the valve is controlled by turning the handle, which is very convenient during operation.
But the principle of operation of all hydraulic jacks is the same, so it is more convenient to use the scheme, because, despite the size and type of products, they have the same causes of breakdowns.

Rolling jacks differ in size and capacity. As a rule, the valve is controlled by turning the handle.

The force generated by the plunger is transmitted through the oil used as the working fluid to the piston connected to the rod. In this case, oil is pumped from the front cavity of the cylinder of the jack to the rear (from the side of the plunger). At the same time, the bypass channel is closed, and the inlet and discharge valves allow the oil to move only towards the rear cavity, that is, the jack works like a pump. When the bypass needle (which is a pointed threaded rod) is opened, oil can flow back into the anterior cavity through the bypass. If at this moment the jack is under load, then the piston rod will sink into the cylinder.
The jack's performance is ensured by observing three conditions:

Tight fit of the valves to the seats.
The required oil level.
The absence of air bubbles in the oil.

Do-it-yourself repair of a sliding hydraulic damkra

This is usually due to either a lack of oil in the jack, or damage or dirty valves.
In the first case, it is enough to add oil to the jack.
What kind of oil to fill the hydraulic trolley jack?
There is absolutely no need to look for some kind of special oil for this. Although, if you use the jack all year round, then it is better to fill in synthetic motor oil - after all, it thickens less in the cold. In some car services, when the turnover "sticks", they generally fill in the "working off". But it is extremely undesirable to do this - the used oil is dirty and contains a large percentage of aggressive sulfur compounds.

If you use a jack all year round, then it is better to fill in a synthetic motor - after all, it thickens less in the cold.

If the filled jack still does not lift or does not hold, then you cannot do without repairing it - most likely, the valves do not adhere well to the seats. This can happen if the valve springs are "loose" or dirt gets into the channels.
Before repairing, you can in advance a repair kit for a rolling hydraulic jack.
Typically it includes plunger and piston seals.
But it is unlikely that all this will be useful to you - even jacks used daily in car services usually only leak through the plunger seals. Therefore, do not rush to disassemble the jack "bolt-by-bolt". It is enough to remove the plunger and valves with springs. Depending on the specific model of the jack, the valves can be installed either in different "wells", or in one - in series (in such cases, the channel has a cross-section narrowing inside).

Repair kit for hydraulic jack

After repair and filling with fresh oil, the jack must be “pumped” - actively “work” with the plunger to remove excess air.

Carrying out repairs with your own hands on a rolling jack does not present any particular difficulties for a person who has knowledge in the field of technology.The hydraulic sliding jack is an efficient and easy-to-use device, the repair of which you can easily carry out on your own.The jack is a special device designed to move in the vertical direction and fix various loads at the required height. This device is indispensable in the implementation of any repairs associated with the vertical movement of weights, the rolling jack has become especially popular among motorists and auto repairmen.The design of the jack is quite simple, and the principle of its operation is based on the physical properties of the communicating vessels.The pressure required to lift the load is created by pumping the working fluid with a pump into the working cylinder, in which the piston moves.Diagram of the bottle jack device.One of the most convenient and efficient models of jacks is considered to be hydraulic jacks, the functioning of which is based on the use of a special working fluid and a piston mechanism. A special oil is used as a working fluid.The principle of operation of a hydraulic jack is similar to that of a bottle-type hydraulic jack, but differs from it in design and ease of use.The body of the device is made of metal and mounted on two pairs of wheels. In the body of the device, mechanisms are mounted that provide lifting, and a hydraulic cylinder, which, when extended, provides lifting of the platform. As a result of lifting the platform, the load is lifted to the required height.The construction of the hydraulic jack is set in motion using a lever, and the platform is lowered by turning the screw that opens a special valve. Turning the screw of the special valve, which relieves pressure, is carried out using a special handle. As a result of the release of fluid pressure in the working cavity, the weights are lowered to the required height.For industrial, as well as for professional use in the implementation of auto repair work, various models of rolling jacks are used, capable of moving loads up to 20 tons to the required height and fixing them at this height. Such mechanisms have, in addition to their advantages, and some disadvantages. Such disadvantages are the large dimensions of the structure and the large weight of the devices, which makes it difficult to transport such devices. In addition, the use of such devices requires a flat, horizontal solid surface. Image - Jack rolling matrix 3t DIY repair

The device of a rolling hydraulic jack for a car.

To repair the jack, you will need some tools and materials:

wrenches;
container for receiving the drained working fluid;
special flushing fluid;
working fluid - oil.

Any device during its operation can fail. The main malfunctions of the hydraulic jack are:

oil leakage;
wedging of the device when lifting or lowering;
failure of the device to fully lower or raise the stem.

If these problems occur in operation, the device should be repaired.

If the reason for the failure of the device is the occurrence of oil leakage, it is required to disassemble the device. After disassembling the device, the pistons are removed from it and checked for corrosion. If signs of corrosion and contamination are detected, structural elements are cleaned and contaminants removed. After that, the stem is checked. If, as a result of the check, it turns out that the rod has curvature and deformation, then repairs may be considered inappropriate.

Very often, the cause of a jack failure can be a breakdown or clogging of valves in the structure of the device, which are involved in ensuring the lifting or lowering of the working rod of the mechanism. If this type of malfunction is detected, it is required to repair this structural element of the hydraulic jack.

The principle of operation of a hydraulic rolling jack.

When carrying out repair work to restore the operability of the valve allowing oil to pass through, unscrew the valve and check it for accumulated dirt. In addition, when inspecting the valve structure, it should be checked for the presence or absence of deformation. If a mechanical deformation of the device is detected, it should be replaced. If contamination is detected in the valve, then during operation the oil will flow due to the fact that the ball does not fit tightly to the socket. To remove contaminants, the device is flushed; before flushing, the old liquid is drained into a specially prepared container. In the process of draining, the system should be pumped using the operating lever by raising and lowering.

After pumping and disassembling the device, all parts are flushed from contamination and remnants of the old working fluid. All oil seals and gaskets should be replaced during the repair process. If contaminants enter the working cavity, it is required to unscrew the head of the housing for cleaning.

A special flushing liquid or kerosene is poured into the tank and pumping is performed. The shut-off needle must be removed during this procedure. After the procedure, kerosene or special flushing fluid is drained, and the working cavity is filled with a clean working fluid.

The appearance of the various jacks.

The efficiency of the device can be reduced as a result of the accumulation of air bubbles in the working cavity, which are formed in it due to an insufficient amount of oil.

Repair work in the event of this type of malfunction and its elimination is carried out as follows. First you need to remove the plug in the oil tank, and also open the bypass valve. After that, the hydraulic jack pump is pumped in a fast rhythm. This is done so that air bubbles are transported from the cavity to the oil container. After pumping, the cover of the oil tank opening is closed, and then the bypass valve closes. If all operations are performed correctly, the hydraulic jack will start to work in normal mode with full efficiency. If air remains in the working fluid, the pumping procedure should be repeated.

Removing air from the device is carried out by another method. For this purpose, it is required to unscrew the locking needle one and a half to two turns. Then the plunger is lifted by hand, the plunger should be brought to the extreme point. After raising the plunger, it returns to the lowest position. The procedure must be repeated several times. In order to avoid the occurrence of airing of the working system of the jack, during the operation of the device, check the oil level regularly and, if necessary, top up it.

To prevent damage to the jack during intensive use of the equipment, the working fluid should be regularly replaced, and if its level in the device falls, top up and pump it.

An indispensable device for lifting cars is a jack. It is put into new cars as a mandatory repair equipment. For cars, a mechanical device is enough, but to lift trucks, you cannot do without hydraulics. Like any mechanism, the jack can fail, including due to intensive use. For further work with it, it will be necessary to pump the working fluid. We will tell you how to pump a hydraulic jack in our article.

Before proceeding with the repair, it is necessary to diagnose the device. There may be several reasons why the device may not perform its functions. The main ones are:

airing the working fluid (air bubbles appear in the oil, which interfere with the transfer of force to the piston);
corrosive deposits (a decrease in the passage channels due to the formation of corrosive layers on the stacks, which reduce the diameter or clog the path for oil);
loads that deform the working rod (the bent rod passes tightly in the working area and can transfer the load not along a given axis, which leads to the "firing" of the jack from under the load being lifted);
contamination of the working fluid (oil contains particles of debris or metal wear, which negatively affects the quality of the device).

Do-it-yourself standard repair of a hydraulic jack begins with identifying defective places in the device and preliminary preparation for service.

Types of hydraulic jacks

The work is carried out in several stages:

The hydraulic jack design assumes that the main driving force in the apparatus is oil. It is it, as a working fluid, that pushes the stock and moves all cars up. The oil level must not be lower than the established norm, otherwise it simply will not be enough in volume to fill the necessary cavities inside the jack and perform its lifting functions.

Before filling the device with fresh working fluid, it is necessary to dispose of the old waste oil. To do this, you need to unscrew the plug from the oil reservoir. First, you need to substitute a container for collecting "mining".

After waiting a couple of minutes, flushing liquid is poured into the device. Its cost is about 180 rubles. By pumping the flushing through the hydraulic channels, we get rid of unnecessary air bubbles. When the flushing liquid begins to flow into the oil reservoir, it means that there is no air left in the system.

Bleeding must be carried out in accordance with the manufacturer's recommendations. They are usually indicated in the instructions for use.

After draining the "flushing" into a special container, the liquid is passed in a circle for another 1-2 additional times.

So you can be sure of the result. After that, we pump out the flushing.

Then you can fill in new oil. This operation is performed up to the level specified by the manufacturer. Lack of working fluid can adversely affect the function of the jack. It simply won't pick up the required power. Filling is carried out, as a rule, with the working rod fully lowered. Turn the bleed screw all the way to lower the jack as much as possible.

Schematic device of a hydraulic jack

The oil will gradually fill all working volumes. Therefore, it is necessary to wait for several minutes until it is completely distributed throughout the system, and after that, if necessary, to top it up again to the operating level. And so we top up several times.

One of the signs that the required liquid level has been set in the system is the absence of air bubbles on the oil surface during pumping.

When there is a working oil level in the reservoir, the jack is completely ready for use. It is only necessary to tightly close the reservoir lid. No other preparatory or additional procedures are required.

To use the device in winter, it is advisable to use synthetic oils.

They often have better readings in cold weather than mineral fluids. If it becomes necessary to use a jack at low temperatures, then it is advisable not to use it for a long time, since the oil changes its properties at low temperatures. Its viscosity increases and frictional properties decrease.

It is recommended to store the jack with a vertical rod position.

This will prevent oil leakage. It is preferable to choose a storage location with a positive constant temperature in order to avoid the formation of condensation and the appearance of rust on the work surfaces.

Carrying out repairs with your own hands on a rolling jack does not present any particular difficulties for a person who has knowledge in the field of technology.

The hydraulic sliding jack is an efficient and easy-to-use device, the repair of which you can easily carry out on your own.

The jack is a special device designed to move in the vertical direction and fix various loads at the required height. This device is indispensable in the implementation of any repairs associated with the vertical movement of weights, the rolling jack has become especially popular among motorists and auto repairmen.

The design of the jack is quite simple, and the principle of its operation is based on the physical properties of the communicating vessels.

The pressure required to lift the load is created by pumping the working fluid with a pump into the working cylinder, in which the piston moves.

Diagram of the bottle jack device.

One of the most convenient and efficient models of jacks is considered to be hydraulic jacks, the functioning of which is based on the use of a special working fluid and a piston mechanism. A special oil is used as a working fluid.

The principle of operation of a hydraulic jack is similar to that of a bottle-type hydraulic jack, but differs from it in design and ease of use.

The body of the device is made of metal and mounted on two pairs of wheels. In the body of the device, mechanisms are mounted that provide lifting, and a hydraulic cylinder, which, when extended, provides lifting of the platform. As a result of lifting the platform, the load is lifted to the required height.

The construction of the hydraulic jack is set in motion using a lever, and the platform is lowered by turning the screw that opens a special valve. Turning the screw of the special valve, which relieves pressure, is carried out using a special handle. As a result of the release of fluid pressure in the working cavity, the weights are lowered to the required height.

For industrial, as well as for professional use in the implementation of auto repair work, various models of rolling jacks are used, capable of moving loads up to 20 tons to the required height and fixing them at this height. Such mechanisms have, in addition to their advantages, and some disadvantages. Such disadvantages are the large dimensions of the structure and the large weight of the devices, which makes it difficult to transport such devices. In addition, the use of such devices requires a flat, horizontal solid surface.

The device of a rolling hydraulic jack for a car.

To repair the jack, you will need some tools and materials:

wrenches;
container for receiving the drained working fluid;
special flushing fluid;
working fluid - oil.

Any device during its operation can fail. The main malfunctions of the hydraulic jack are:

oil leakage;
wedging of the device when lifting or lowering;
failure of the device to fully lower or raise the stem.

If these problems occur in operation, the device should be repaired.

The principle of operation of a hydraulic rolling jack.

The appearance of the various jacks.

The efficiency of the device can be reduced as a result of the accumulation of air bubbles in the working cavity, which are formed in it due to an insufficient amount of oil.

Video (click to play).

To prevent damage to the jack during intensive use of the equipment, the working fluid should be regularly replaced, and if its level in the device falls, top up and pump it.

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