Hydraulic jack of the ussr do-it-yourself repair

In detail: a hydraulic jack of the ussr do-it-yourself repair from a real master for the site my.housecope.com.

In order to repair the hydraulic jack as little as possible, you need to monitor the product and operate it correctly. Maintain the correct level of fluid that seeps through the seals. Often, due to the ingress of air, the load is jammed while it is being lifted. Then difficulties arise when it is lowered. In these cases, the jack needs to be disassembled and repaired. Carry out it really on your own, observing a certain sequence of actions.

The hydraulic jack consists of 3 parts:

At the beginning of operation, the mechanism is placed on a flat surface, the valve closes and, due to the movement of the lever, the stem is lifted. On descent, the valve opens and the pressure of the weight returns the stem to its place.

When the lever is pressed, fluid is pumped from the housing into the cylinder, pushing it up. The suction and discharge valves prevent it from returning.

When the valve in the pump opens, the fluid returns to the housing space.

Bottle jacks have the ability to lift loads ranging from 3 to 200 tons. This is ensured by the presence of a large support plane.

There are 2 types of bottle machines:

Single-stem. Due to their ease of use, they are used in mechanical engineering and construction. The jack is adopted by motorists - for lifting cars. Used as a knot in a pipe bender or press.
Double-headed. Works both vertically and horizontally. The device includes 2 rods. They are lifted up by a cylinder.

Externally, it is a cart mounted on wheels. Before work, it rolls up under the load being lifted.

Video (click to play).

The design is large in size, so it is used in tire shops. Lifting is done by pressing the lever. When the valve is opened, the stem is lowered.

If a slight lowering is required, a tubular handle is used. It fits onto the valve screw and rotates it around its axis. A slight decrease in the stock begins.

This type of product has disadvantages:

Large dimensions and heavy weight of the product.
The presence of a concrete or asphalt site.

Do-it-yourself repair of a hydraulic jack. For this, all possible malfunctions and the rules for their elimination are studied. Parts are prepared in advance - to replace those that have failed. The main causes of breakdowns and the rules for their elimination are known. To do this, you need to have a suitable tool at hand.

If the hydraulic cylinder fails, the oil reservoir must be removed. The piston is disconnected first. To do this, use wrenches to unscrew the screws located at the top. The protective rings are removed, the reservoir is pulled out. If the cylinder is damaged, then it is replaced. During the installation process, you will need a clamp. The bolts unscrewed from the jack are replaced with new ones. They come in the same size. If the removed bushings are worn out, replace them. Some models allow the use of the round type.In the event of the upper ring protruding, the upper plate is disconnected. It is preliminarily examined for defects. The screws are unscrewed using keys. It is important to inspect the piston to make sure that the broken ring does not damage it. After that, engage in installing a new one on the stock. In order to improve fixation, use a seal.If there is a flyout of the lower ring, then the lower frame is removed.In this case, the hydraulic cylinder is inspected. Its integrity is checked. It is important that the piston moves smoothly without jamming.To remove the frame, the jack is turned over and securely fixed. The cover is removed only after inspecting the O-ring. Using a screwdriver, the retractable extension is removed. It also requires inspection, since there is a risk of damage from the ring.In the event of its replacement, the marking is specified, which is stamped on the body or recorded in the documentation.During installation, the stem is lubricated with machine oil. A new ring is also being installed.

Before filling in new oil, the old one is completely removed. If flushing liquid is present, it is also removed.

Before filling in a new one, all the air present is eliminated. The outlet valve opens and the device goes down. Then you should carry out at least 5 pumping. The bolt is removed from the filler neck and oil is poured through the nozzle to the required level. Then the pumping is repeated, and the oil is poured again. It is important to bleed all air from the system. As soon as the oil surface stops bubbling and reaches the desired mark, the jack is ready for use.

If the jack is properly operated, the number of breakdowns will dramatically decrease.

To do this, you need to adhere to the following rules:

It is forbidden to lift a load exceeding the permissible one.
The work is carried out smoothly, without jerking.
Installation can only be carried out on a flat surface.
Before work, all movable joints are lubricated.
An external examination of the device is carried out in order to detect cracks or oil leaks.
The oil level is checked and must be brought up to normal.

A monthly maintenance is required to keep the hydraulic jack running smoothly. Since the product is constantly subjected to heavy loads, all parts require the presence of lubricant. It is important to avoid the presence of dirt, which leads to jamming of the apparatus. The device is stored in a lowered state.

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Do-it-yourself air conditioner installation. Description of the device and the principle of operation of the air conditioner. Detailed instructions for installing the device: installation of outdoor and indoor units, laying pipes and wiring.

Lifting a house with a jack with your own hands, step by step instructions. Possible errors during work and lifting technology. Useful video on the topic.

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Devices that lift loads to a certain height have become indispensable in our time. The hydraulic bottle jack is a useful tool in construction, and especially in car repairs. Motorists cannot imagine car maintenance without this wonderful device. If it happens that the jack is out of order, then you just need to know how to make repairs with your own hands.

As you can see in the figure, the hydraulic bottle jack consists of the following parts:

6. Oil storage tank.

When a force is created on the lever (2), the rod (3) creates pressure, as a result of which the valve (5) opens, and the liquid flows into the working chamber (7). When the lever is lifted up, the shut-off valve (5) closes, and the liquid is sucked into the pump cavity from the oil storage tank (6) by means of opening due to the pressure of the suction valve (4). By pumping liquid from the reservoir (6) into the working chamber (7), the main piston (1) rises.

In the device of work, the well-known Pascal's law is used: The pressure produced on a liquid or gas is transmitted to any point without changes in all directions.

The design of a bottle jack is quite simple, we pump liquid from one reservoir to another, and thereby build up pressure in the second, thereby raising the working piston.

Jacks are divided into several types, the first division is according to the number of rods (half-pistons):

Single-stem bottle, the most common type of Fig. 2.
Double-stock bottle Rice 3.

There is also a division according to the principle of operation of a pump that pumps a liquid:

Manual, operated by user pressure on the lever
Large pumps, designed to lift huge masses, are driven by a separate drive, hydraulic pump or hydraulic station.

Carrying capacity, an important parameter that determines the maximum lifting mass. The parameter depends on the volume of the working chamber and strength characteristics. Bottle-type devices have a lifting capacity from 2 to 100 tons.

Minimum lifting height, otherwise it is called the minimum pickup height. This is the height at which the load must already be in order to be able to put the jack under it. Pay attention to the minimum height when choosing a device for a car. If you have a low ground clearance (ground clearance), then the bottle-type device, due to its high design, will not suit you.

Maximum lifting height. The height to which it is possible to lift the load. The bottle has a feature, on the support platform there is a retractable screw that increases the minimum and maximum lifting height.

Low oil in reservoir, The stem does not rise to the height specified in the technical documentation. For DIY repairs, we just need to add oil. We open the oil filling cap, fill it, then pump the jack, how to do this is described at the end of the article.

Oil leaks... It so happens that oil seeps in places, rubber bands and seals, this is the first sign that you need to make a thorough repair, replace all gaskets and seals, and flush. To repair a hydraulic bottle-type jack yourself, you will need a repair kit.

Sags under load... It occurs due to the air inside, one of the rubber bands or gaskets allows oil to pass through and instead of it, air enters the working chamber, which has the property of strongly compressing under load. To eliminate the malfunction, it is recommended to repair the jack, change all gaskets and fill in new oil.

In order to service the bottle jack, it must be disassembled. Don't worry about being splashed with oil from high pressure.It is quite possible to do this operation yourself. The first step is to drain the oil. The drain is made through the filler hole, and in its absence through the through-valve, for this the upper hex nut is unscrewed and the lower valve is completely unscrewed. We remove the case, check its tightness, assess the condition of the lower rubber ring. These parts do not carry loads, they are just a reservoir for the liquid. Then we unscrew the working cylinder and remove the piston. We carefully inspect everything for rust. If it is found, we get rid of it as thoroughly as possible. We unscrew the plunger, check its performance, inspect the O-rings. There should be no iron shavings inside, parts should not have dents. Degraded seals should be replaced with new ones. Do not forget to thoroughly rinse all valves from dirt and various deposits. We assemble, that's all the repairs have been made.

Oil is poured through the filler neck on the side of the case. This throat is also a level. Fill in oil, then you need to pump the jack.

Raise the stem to the highest position without load using the lever
Then they put it on one side, the filler plug should be on top
The plug is loosened and the rod is vigorously pressed into the cylinder. The operation is performed to squeeze air out of the working chamber.
The plug is closed, and 10-15 full lifts and drops of the stem are performed with a load of 40 - 45 kg.
On the last cycle, an increased load should be given and if the jack does not hold, repeat the procedure.

The jack is one of the most important tools in the arsenal, it will help everywhere: repairing a machine or equipment, carrying out a variety of construction and repair work. And if suddenly your device is out of order for some reason, you need to learn how to repair a hydraulic jack with your own hands!

A wide variety of jacks will also please, each of which has its own characteristics and distinctive features.

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 - Hydraulic jack of the ussr do-it-yourself 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 - Hydraulic jack of the ussr do-it-yourself 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 - Hydraulic jack of the ussr do-it-yourself 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!