How to repair a bottle-type hydraulic jack (and more)

Why doesn't the bottle jack work?

There is little oil in the tank, the rod does not rise to the height specified in the technical documentation.
To repair it yourself, we just need to add oil. Open the oil filler cap, fill it, then pump the jack, as described at the end of the article. Oil is leaking. It happens that oil leaks in places, rubber bands and seals, this is the first sign that a major repair needs to be made, all gaskets and seals need to be replaced, and a flush must be carried out. To repair a hydraulic bottle jack yourself, you will need a repair kit.

It sags under load. Occurs due to the air inside; one of the rubber bands or gaskets allows oil to pass through and instead air enters the working chamber, which tends to compress strongly under load. To eliminate the problem, it is recommended to repair the jack, change all gaskets and fill in new oil.

Flushing with cleaning fluid

Open the hole for filling. Drain all the oil into a prepared container. Next, add cleaning fluid. This procedure removes remaining oil and other dirt from the system. Next we follow the following algorithm of actions:

• Fill in the cleaning liquid.
• We move the lever, the liquid spreads throughout the system.
• Add fluid and pump the lever until the rod rises to the top position.
• Next, we open the check valve, the rod returns to its initial position, and part of the cleaning liquid is squeezed out of the system.
• If the squeezed out liquid is dirty, repeat the algorithm several times.

How to change a hinge at home

Now let’s talk about how to properly install silent blocks. Since the lever includes a rubber component, it is simply impossible to hammer the hinge (the rubber will dampen). At the service station, to carry out this kind of operation, a hydraulic press for silent blocks or a set for pressing out silent blocks is used. With their help, replacement is not difficult.

Press for pressing silent blocks

To carry out work in a garage, it is not necessary to purchase a special tool; the available tools will suffice:

• Bench vice;
• Percussion instrument (hammer);
• Metal attachment;
• Screwdrivers;
• File;
• Soap solution;

Read also: Templates for a wood router with your own hands

Using a regular vice and a piece of pipe of the required diameter, we get a pretty good press for pressing silent blocks in with our own hands.

Tool for replacing joints in your car yourself

But before you press the silent block into the lever, you still need to remove the worn element. And for this you can use several methods, but in any case the lever will have to be removed from the car. And then you can:

• Holding the lever in a vice and using a hammer with an adapter, knock out the hinge, first cutting off the rubber protruding beyond the edges of the lever eye (so that it does not create resistance);
• Use a vice. We take a piece of pipe (it should be larger in diameter than the silent block and its walls should rest against the eye). We put this segment on the hinge on one side, and on the other we use an attachment. We place this structure in a vice. When tightening the jaws of the vice, the attachment will push the element inside the pipe section;
• Fire out the silent block. Using an open fire (burner), we burn out the rubber component, and then knock out the remains with a hammer (this method is not recommended);
• Use a silent block remover (purchased or homemade);

Before pressing the silent blocks, its seat should be cleaned with a file to remove rust and remnants of the old hinge.

Now let’s talk about how to properly press silent blocks using a vice. Before starting work, it is advisable to make a chamfer on one side of the rubber component (cut it off with a knife), which will allow you to more accurately match the hinge with the eye.

You should also generously lubricate the seat and hinge with soap solution. It is not recommended to use lubricants based on petroleum products for this, as they have a negative effect on rubber.

The correct installation of silent blocks is done like this: we match the hinge with the eye, and holding them like that, we place them between the jaws of the vice. Then we carefully tighten it, periodically inspecting it from all sides to make sure that the hinge runs smoothly and without distortion.

After the silent block passes through the eye and rests against the bushing, remove the lever from the vice. You can finally seat the hinge with a hammer. In this case, you should make sure that the silent block is located exactly in the middle and does not protrude to any side. If necessary, we adjust its position with the same hammer.

In this simple way, without special equipment, you can change silent blocks in a garage without spending money on service stations.

By assembling a press for silent blocks with your own hands, you will save yourself from the need to visit a service station, wait in line and pay a lot of money for the services of auto mechanics. Carrying out some repair work on your own car is often limited by the banal lack of necessary equipment. It is not necessary to buy a hydraulic press. You can assemble the structure with your own hands.

How to check the quality of blade sharpening

Before installing knives into the tool, it is recommended to check the quality of their sharpening. The simplest test is this:

1. Take the blade in one hand and regular printer paper in the other.
2. A sharpened edge is drawn along the edge of the sheet from top to bottom or they are tried to cut it across, holding it suspended.
3. Evaluate the result.

If the knife is sharpened well, the cut will be perfectly smooth and neat. A dull edge will not cut the paper or will tear it roughly and unevenly. After regrinding, you need to check the tool in operation on a test workpiece, which you don’t mind ruining.

Warning! It is not recommended to evaluate the sharpness of metal with your finger without appropriate experience. A well-sharpened corner can leave a deep cut.

Hydraulic jack repair

Repairing a jack is in most cases quite simple if you have the necessary supplies. It is worth considering that the appearance of corrosion on the surface can significantly complicate the task. Therefore, you need to purchase a special liquid to remove corrosion and oxidation.

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

1. The essence of the problem is determined. If the structure does not hold pressure, then there is a high probability of wear of the seals. If lifting occurs with difficulty, there is a possibility of rod deformation or other problems.
2. A complete analysis of the structure is being carried out. At this stage, the main thing is not to damage the fasteners. It is worth remembering that when pressure is applied, the working cavity must contain it. Even a minor defect can cause a leak and a drop in pressure.
3. The integrity of the main elements is inspected. In most cases, the cause of the problem can be determined by visual inspection of the structure. For example, seals may have recesses, grooves and other deformations, the rod may have a slight bend, or channels may have 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 that the rubber bands do not move during operation of the device. It is worth considering the sequence of arrangement of rubber bands and seals of various types. Incorrect installation may result in the device not holding pressure.

As previously noted, the curvature of the rod and damage to the mirror surface cannot be corrected independently. Too much wear leads to the need to replace the entire element or the lifting mechanism itself.

The bottle-type hydraulic jack has an even simpler design. As a rule, it does not require any adjustments. Therefore, after assembling it, you can begin testing and subsequent operation, provided there are no problems. Some manufacturers of lifting mechanisms provide instructions on how to disassemble the device and carry out repairs. Its use allows you to significantly simplify the task.

Bottle jack

The repaired hydraulic jack must first be checked to ensure 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, you should ensure that you have insurance in case your car or other machinery is lifted. If repairs are carried out correctly, the service life of a hydraulic jack can be significantly extended.

What is the sharpening angle of the knives of a manual and electric plane in degrees

If the tool has become dull, then it is not enough to simply sharpen the plane knives at home until they are sharp. It is necessary to maintain a certain angle, otherwise the blade, even after processing, will not be able to remove chips from the wood efficiently.

The indicator depends primarily on the type of workpieces used in the workshop. According to the rules, the sharpening angle of a plane knife is equal to:

• 20-25 degrees - for processing pine, aspen, larch, linden or other soft wood;
• 30-35 degrees - for planing oak, maple, pear, hornbeam and other hard workpieces.

Most often, the cutting piece of the tool already has a clearly defined sharpening angle. There is no need to re-shape it; it is enough to simply adhere to a clearly visible bevel on the metal.

Attention! When carrying out home sharpening, it is very important to firmly fix the tool during the process, otherwise the clarity of the angle will suffer.

Air injection mechanism

If we are talking about using the device in a garage, or using it in a tire shop, then there is only one option. This is a compressor that runs on 220 volts. By the way, there are models of pneumatic jacks that can also use a compressor that pumps no more than 2 atmospheres and operates from the on-board vehicle network of 12 volts, but this option is good in nature when there are no other options for hanging the car.

A garage needs a reliable and efficient compressor, although almost all modern models provide a pressure of 6 atmospheres, which is quite sufficient for the operation of an air spring from a truck.

Oil leaks

To repair a hydraulic jack yourself, you should have a ready-made repair kit. But before you begin such work, you should familiarize yourself with the diagram of the equipment and the principle of its operation.

The most common repair that needs to be done when using this type of jack is repairing oil leaks. Why is this happening? The reason for this is usually mechanical damage to certain parts of the equipment or their wear.

Jack repair

When starting to repair a hydraulic jack with your own hands, you should prepare a container in advance where you can drain the old oil, as well as prepare a new fluid that will be poured into the device.

First of all, the pistons are removed and checked for signs of corrosion. It, like any contaminant, must be carefully removed. At the same time, the rod is also checked for deformation. If they are found, the part will need to be replaced.

Next you need to check the valve that allows oil to pass through. To do this, the device is removed, it is checked for any deformations or dirt. If the reason for oil leakage from the cylinder is valve deformation, it is simply replaced. If the reason that the valve ball does not completely melt into the seat is due to contamination, it is simply cleaned, which prevents the jack’s working fluid from leaking.

After this, all parts of the device are thoroughly washed with kerosene, clearing them of old oil residues and any contaminants. In addition, it would be useful to replace the sealing gaskets and cuffs.

Replacing damaged high pressure hoses

Repairing shock absorbers with your own hands
From all of the above, we can conclude that repairing high-pressure motors consists of either replacing the damaged area or replacing fittings that have become unusable.

When replacing a damaged area, as well as when replacing fittings, you will need to crimp the couplings, that is, technologically these two actions are very similar.

High pressure hoses

The sequence of operations looks like this:

1. The damaged sleeve is disconnected from the main mechanism.
2. A new sleeve is cut to the size of the old one on a cutting machine. Moreover, for measurement, the distance between the ends of the nipples at its ends is taken. It is better to choose a hose pump designed for a higher pressure than that for which the old hose pump was designed.
3. The markings on the sleeves will help you choose the right diameter.

The factory marking DN indicates the diameter of the internal channel of the hose.

If a hose designed for high pressure (heavy hose) is to be repaired, its ends are stripped inside and out to the metal braid. This operation is performed on debarking machines. Then select the necessary fittings. This can be fraught with certain difficulties, since imported fittings are manufactured to different standards. In case of difficulties, the easiest way is to take measurements on the old fitting with a caliper and a thread gauge, which will allow you to accurately set the required diameter and thread pitch and then select the necessary parameters for the new fitting using the tables. After debarking and selecting fittings, they are crimped on crimping machines. Removable crimping jaws are selected for each diameter. Next, the quality of the crimping must be checked. A control probe is used for this, but it is best to carry out testing on a special test bench.

If a non-standard connection is encountered, repairs are carried out using a repair fitting. To do this, take the head of the old fitting, to which the part to be crimped is soldered.

High-pressure hoses

This method is often used by car enthusiasts for emergency repairs of power steering hoses, as well as by owners of Kircher pumps and miniwashes.

Types of hydraulic jacks

Today, the tool market offers a large selection of hydraulic lifting devices. Each of them has its own properties and features, which it is advisable to familiarize yourself with before choosing this lifting device:

1. Rolling hydraulic jack. Visually it resembles an ordinary cart with a handle, which is rolled under a certain heavy object. This unit is controlled manually using a handle, which is used to move the cargo trolley with a jack. Among hydraulic rolling mechanisms, the 3-ton Matrix jack has shown itself to be very good; it is widely used in automobile workshops and warehouses. But to use it, you need a fairly solid and level area. A hydraulic trolley is often made in-house.
2. Hybrid hydraulic lifts. This design combines rolling and bottle types of jacks. Controlled using a foot pedal or lever. The hybrid lift has become widespread in auto repair shops.
3. The diamond hydraulic lift has a lifting capacity of about 2 tons. Like the hybrid one, it is widely in demand in car repair shops. Its design consists of two rigid frames that are connected to each other using hinges. During operation, the frames rise and form a diamond-shaped structure - hence its name.

Types of hydraulic jack drives can be mechanical or electrical. With a manual drive, liquid is pumped from the reserve tank to the working one using a mechanical lever; with an electric drive, naturally, due to an electric pump.

Bottle type hydraulic lift

This is the most common tool for lifting heavy loads, while the design of the jack is the simplest, but this does not make it difficult for them to lift weights of more than 100 tons.

The instrument has a large support base and a fairly compact body. The bottle hydraulic jack can be of two modifications - with one lifting rod or with two.

Single-rod lifts are used in construction and installation work, car repair and automobile workshops, as well as in other industrial areas where vertical lifting of loads may be required. The tool with two rods is universal and can be used both for lifting loads in the vertical direction and for horizontal work.

Instructions

Initially, it is worth deciding what exactly is meant by “pumping” in relation to modern lifting mechanisms. We are talking about a set of actions aimed at displacing air from hydraulic cylinders. In this case, the whole process comes down to pumping the working fluid with a pump. This was precisely the determining factor in the appearance of the name of the procedure, which is one of the most important points in the maintenance of lifting devices.

Those who have at their disposal an old hydraulic jack or a relatively new model of modern lifting equipment with obvious signs of airiness need to know how to quickly deal with such a problem. Nowadays you can find a large amount of relevant information on the Internet. First of all, it should be noted that to effectively restore the functionality of the device, you will need a standard arsenal of tools, as well as about 300 ml of ordinary mineral oil or special fluid for hydraulic systems.

To effectively bleed a bottle-type hydraulic jack, you will need to perform the following steps.

1. First of all, you have to find the filler hole, which is sealed as tightly as possible with a rubber stopper. In the vast majority of cases, it is located at the top of the device. Taking into account the design features of different models, the plug can be recessed into the body or protruding above it.
2. Open the oil fill hole, carefully removing the plug to avoid damaging it.
3. Completely drain all working fluid. It is worth considering that this measure is relevant in cases where it is necessary to service an old hydraulic jack that has been actively used for a long time without maintenance. To completely remove any remaining oil, unscrew the bypass valve and lower the piston all the way.
4. Rinse the cylinders using special liquids, as well as kerosene or oil, which will be filled afterwards. To do this, you need to pour the flushing agent through the previously mentioned hole, pump the piston to the top point, and then open the valve and lower the rod all the way. This procedure must be repeated several times.
5. Fill the hydraulic cylinder with oil by placing the bottle hydraulic jack in its working, that is, vertical position. Experienced users and specialists advise using a syringe.
6. After the container is filled to the maximum level, screw the bypass valve all the way. At the next stage, use up/down movements to raise the piston of the device until it stops.
7. Then you need to unscrew the valve a little and manually lower the piston with the filler hole open. This sequence of actions is repeated several times.
8. If the described algorithm does not lead to the desired results, and air remains in the system, then you can unscrew the shut-off valve several turns, lift the piston manually and sharply lower it. In this case, the use of a pump is excluded. Such manipulations are repeated several times, and with each approach the length to which the rod extends is reduced by 1 cm. As a rule, such radical measures allow you to quickly get rid of air in the hydraulic system.

Hydraulic lifts of the rolling type are characterized, first of all, by increased load capacity. In this case, the main performance indicator directly depends on the tightness of the system and the pressure created in the working chambers. To maintain full functionality of rolling models, they need to be periodically pumped.

The source of problems with this category of hydraulic jacks can be contamination and air ingress. There are several ways to correct the situation. The first option for pumping rolling equipment involves the following steps:

1. open the oil filler plug;
2. unscrew the bypass valve;
3. Bleed the working cylinder with quick movements;
4. Screw the valve all the way and close the filler hole tightly.

Unfortunately, in some situations, the manipulations described above cannot completely squeeze out the air from the hydraulic system. At the same time, many are interested in how to identify its remains in the jack cylinders.

In such cases, you will need to find a locking needle, which is an integral part of the design of any modern rolling hydraulic jack. It is turned out 2-3 turns, after which, in manual mode, the piston should be extended several times until it stops and returned to its original position. As a result of such manipulations, as in the situation with bottle models of equipment, the air will be completely squeezed out of the system.

Air bubbles and troubleshooting

As for the operating efficiency of a hydraulic rolling jack, in most cases it is reduced due to the fact that air bubbles accumulate in the main cylinder. The formation of bubbles can be caused by an insufficient amount of liquid in the working cavity.

Before carrying out repair work in such cases, you must first unscrew the plug in the oil tank and remove the bypass toggle switch, after which you can begin bleeding the mechanism pump. This is necessary so that air bubbles move from the cavity into the liquid container. After the bleeding procedure, the tank lid and the bypass valve are closed; if all operations were performed correctly, the jack will function normally.

Pumping oil into a hydraulic lift

Experienced professionals recommend using another common method to remove air bubbles from the jack. To do this, the locking needle must be unscrewed no more than 2 turns, and the plunger must be lifted to the extreme point using your hand. After raising the toggle switch, after a certain period of time it will return to its lowest position. It is worth noting that the procedure often needs to be repeated 2-3 times, and in order to prevent air from accumulating in the working system of the lift, it is necessary to control the volume of working fluid during its use. If there is not enough oil, it should be added, while monitoring the quality, and also change the cuffs for the rolling jack in time.

To prevent unwanted breakdowns of Chinese hydraulic lifting mechanisms, when they are used intensively, it is imperative to replace the working fluid and ask yourself why the rolling jack does not lift under load. It is worth remembering that if the oil level drops, it should be topped up, and then the entire structure should be pumped. Before starting repair work, you must definitely study the manufacturer’s recommendations, which are indicated in the technical data sheet attached to the jack. Otherwise, if you ignore all the recommendations, you can provoke premature failure of the tool without the possibility of further restoration.

A strong and simple assistant in lifting unbearable weights, it has a reliable design that serves as a guarantee of safe work. A high strength criterion is considered the main indicator of the jack’s effectiveness; however, even this level does not exclude the possibility of device failure. In this topic, we have given all the possible causes of breakdowns of hydraulic jacks of any type, disassembled them and compiled step-by-step instructions for eliminating certain malfunctions.

When the device is broken

If the lifting mechanism breaks down, the work on repairing the technical equipment stops completely. The cause of device failure may be improper operation, foreign objects or air entering the hydraulic system. When using the lever, the piston movement may not be smooth enough and the oil pressure may decrease.

Depending on which node does not perform functions, a sequence of measures is developed to eliminate the cause. Cleaning the mechanisms from clogging, adding fluid, replacing the valve and pumping the piston system will help restore the performance characteristics of the device. Any cause of failure can be identified after removing the housing cover; if mechanical damage to parts is detected, then it is better to replace the old jack with a new one.

Option No. 8. DIY electric jack

Our selection is completed by a rather complex lift, which not every home craftsman can handle. The electric jack consists of:

• electric drive;
• lever mechanisms.

Electric window lift from VAZ 2110 Step 1. A drive with cables is not required, so you need to unscrew everything, leaving only the motor with the gearbox. In addition, you will need a square head with 7 mm edges.

Square head

Step 2. The author also used a standard jack from the Lancer, but you can use any screw diamond jack instead. For fastenings, you can use strips of metal or, as in our example, furniture corners.

The example uses furniture corners

Step 3. The corners are trimmed and given the desired configuration. Then they are attached to the gearbox.

The corner is clamped in a vice Bending the corner Another photo of the process

Step 4. Then the mount and the head, which is placed on the gearbox, are welded to the jack.

The angle is attached to the gearbox The same, but from a different angle The head and mount are welded

Step 5. To control the structure, a button from the same power window will be used.

The design is controlled by a button from the same ESP

How to understand that it's time to sharpen

The sharpness of a knife is assessed in 3 main ways. Both individually and collectively:

1. For work . When planing, thin and long chips are not formed, the wood is torn. It takes significantly more effort to drag the plane across the workpiece.
2. Visually . The blade is turned in the light. At a certain angle under light, the state of the tip is clearly visible. It may be rounded, rolled up, have burrs on the back of the knife or gouges from an accidental nail or self-tapping screw hidden in the wood.
3. To the touch . An experienced craftsman can determine the condition of the point by simply running a finger lightly across the point, along the planing axis.

The photo shows normal, although extremely thick, shavings.

Tips for use

To extend the service life of the jack, it is recommended to adhere to the following rules:

1. It is advisable to change the lifting mechanism oil twice a year. If the jack is used daily, it is recommended to replace it at least once a month with mandatory washing.
2. Any replacement oil can be used. But for the winter season, it is recommended to fill only synthetic types of oils.
3. To prevent the oil from thickening in winter, the tool should be stored in a warm and dry room.
4. If lifting work is carried out in winter, it should be remembered that if the tool is used for a long time in severe frost, it may fail. Therefore, it is advisable to work with it as a last resort and for a limited time.

The best “repair” of the lifting mechanism is prevention to prevent malfunctions, that is, constant care and timely replacement of the working fluid with pumping. After all, you will have to use your time and sometimes some resources to fix any breakdown. Therefore, you should follow all the operating instructions for hydraulic lifting tools, and then they will serve for quite a long time.

Disassembly

Taking into account the simplicity of the design, in the vast majority of cases, if you have the knowledge, skills and tools, it is quite possible to repair a faulty hydraulic jack with your own hands. Difficulties arise most often when it is necessary to overhaul and repair non-demountable structures. However, now you can easily find a sufficient amount of materials on the Internet.

They are devoted to the work described, as well as the materials used in their implementation, including repair kits. To disassemble almost any hydraulic jack, you will need:

hammer and chisel;

This list in each specific case will depend on the jack model and its design features. This means that in some situations it is very easy to get to the “insides” of the lifting mechanism. However, disassembling the device will often require some time and effort. The process of disassembling a hydraulic jack can be considered using the example of a classic bottle-type model.

In a simplified form, the sequence of actions will look like this:

First of all, you will need to completely drain the working fluid (oil). To do this, use a special drain hole or a bypass valve. You will need to unscrew the upper nut (hexagonal), as well as the lower valve. The next step is to remove the housing. At this stage, an inspection is carried out to detect faults and damage. We are talking about the tightness of the housing and the condition of the lower o-ring

It is important to remember that these structural elements are not subject to loads and perform the functions of a reservoir. Then you will need to unscrew the working cylinder itself and remove the piston.

After all of the above manipulations are completed, unscrew the plunger.

How to properly sharpen a knife for a hand plane

It is easiest to sharpen the blade of a hand-held plane. The algorithm looks like this:

1. Unscrew the clamping bolts on the tool and remove the blade from the block.
2. A coarse grinding stone is placed on the table and moistened with water.
3. The knife is placed on the surface of the stone in accordance with the desired angle.
4. Perform slow circular movements on the abrasive stone for several minutes.
5. After rough grinding, take a stone with a fine grain and repeat the same procedure on it in order to properly polish the processed edge.

Advice! It is better to sharpen the knife at the first sign of dullness. In this case, the procedure will not take much time, and it will be easier to restore the desired angle.

When regrinding a piece of iron, you can make movements not only in a circle, but also in the direction away from you

Types and types of jacks: choosing the best

You will also be pleased with the wide variety of jacks, each of which has its own characteristics and distinctive features.

• The most famous is the mechanical one, the main advantage of which is considered to be low cost. Additional advantages are: low weight, high lift level and fast working stroke. Among the disadvantages, the small support area is noted, which leads to little stability.
• The next type is electrical equipment, it works from the electrical wiring of the machine, and the jack is controlled using a small block. The load capacity of the device reaches 2 tons, but the disadvantages include the large mass of the device and manual lowering, which requires a lot of time.
• There is also a pneumatic jack, which runs on compressed air or a compressor. The advantages include low weight, reduced work costs, and a large support area.
• But we will pay more attention to the hydraulic jack, because this model is most often used not only when repairing a car, but also during construction work, including work with reinforced concrete and reinforcement structures. They are able to demonstrate the highest possible performance, because the efficiency of the device reaches 80%, and the load capacity is about 200 tons, depending on the model. Unfortunately, we cannot do without difficulties. For example, you cannot precisely adjust the release height, so you should study the operating instructions for the tool in advance. During operation, in order not to cause the jack to break, it is advisable to monitor the condition of the oil seal, valves and the presence of oil. Yes, and you need to transport the tool wisely - only in a vertical position, so that the fuel does not simply leak out through the valve.

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

Main characteristics

Load capacity. Load capacity starts from 2t and above. For a simple passenger car for everyday needs, a carrying capacity of 2 tons is enough. This 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 load 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 the choice.

Maximum lift height. It is different for each model

SUV owners need to pay maximum attention to this parameter. There is no point in paying for a tool that lifts the car 2 cm

The maximum lift height for SUVs starts from 450 mm.

Minimum height. The parameter determines the ability to roll the device under a car. A rolling jack with a minimum height greater than the ground clearance of your car will not help you. Be sure to measure the ground clearance before choosing.

Ease of use. Rubber pad, on the supporting support.

Type of mechanism drive. Cardan and gear. The recommended cardan type, it has proven its reliability and is also more repairable.

Some final tips

The performance of the jack depends on the quality of the lubricants that are poured into it. You should not skimp on oil, as this can lead to serious damage that will not be repairable in the future. If the device will be used in various conditions with temperature changes, it is better to fill the jack with a frost-resistant synthetic lubricant, which will preserve the functionality of the system.

In winter, it is better to refrain from using the device for a long time in the cold, since all gaskets and seals are very sensitive to low temperatures.

Jack operating diagram

Professional rolling jacks differ in size and load 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 diagram - after all, despite the size and type of products, they have the same causes of breakdowns.

The force created 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 jack cylinder to the rear cavity (from the plunger side). 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 front cavity through the bypass channel. If at this moment the jack is under load, the piston rod will sink into the cylinder. The performance of the jack is ensured by compliance with three conditions:

1. Tight fit of valves to seats.
2. Required oil level.
3. No air bubbles in the oil.

Troubleshooting Methods

Oil leakage is the main problem, due to which the rolling jack does not lift completely (if the leak is small) or at all (if the leak is significant). Because of this, air enters the cavity, and then the hydraulic jack works with little force or refuses to work at all. Leaks in the hydraulic system can be prevented by routine maintenance and checking the oil level. If the level is low, you just need to add fluid to the normal level.

Due to lack of fluid, air leaks into the hydraulics. This problem is solved by bleeding: you need to unscrew the cap of the oil tank and the bypass valve, and then simply pump the system, that is, move the lever up and down until the liquid passes into the main cylinder.

Often the cause of hydraulic jack malfunction is corrosion on the pistons, rods and cavity of the unit. To determine the cause in detail and repair it, you will have to disassemble the device.

A bent rod is also a common reason why a rolling jack does not lift or operates jerkily. In this case, you can change this element by taking an analogue from the old model, or purchase a new part. In most cases, such a malfunction cannot be repaired at all, even in a workshop or service center. This is explained by the fact that the rod usually bends under shock loads, and in this case the main elements of the housing are damaged. In this option, it is cheaper to purchase a new unit without having to restore or replace individual parts.

When the bypass valve becomes deformed or dirt simply accumulates in it, the valve ball sits tightly in the seat and hydraulic fluid leaks through it. In this case, you will simply have to replace it and replace the old (contaminated) oil with new one.