A jack is a device that should be located both in the trunk of a car and in the car enthusiast’s garage. In this case, it is better to choose a more massive second option with universal functionality and a high load capacity. These characteristics are 100% consistent with your own hands, which is not difficult to do.
Characteristics of the pneumatic device
There are three main criteria by which a homemade inflatable jack is evaluated:
- Load capacity indicator. To ensure safe operation, this value must exceed the weight of the vehicle. For a passenger car, characteristics of about two tons will be sufficient; servicing heavier vehicles requires a carrying capacity of at least 2.5 tons.
- Pickup height. This aspect plays an important role if the car has low ground clearance. The optimal indicator is a value of at least 100 mm.
- Lift level. A homemade pneumatic jack has a height of no more than 500 mm. This reserve is quite enough for changing wheels and some other work; a rigging unit with a connection to a compressor allows you to raise the car up to 70-80 cm.
Definitely, when choosing a jack and its manufacture, first of all you need to focus on your car, the conditions of its operation and storage.
How to make a jack yourself?
To build a jack with your own hands, you will not need much material and effort. You need to select the following details:
- a used truck cushion;
- suitable bolt;
- ball element;
- VAZ wheel clamp;
- union;
- The main tool is a drill.
The structure is assembled from the presented elements. A bolt is screwed into the hole of the pillow. First you need to make a socket in it for the fitting from the camera.
A wheel bolt from a VAZ is used as a valve, in which a hole is drilled. At the next stage, the existing elements are connected after a ball is installed in the hole, which will serve for air intake.
Peculiarities
For the practical implementation of this device, a special pump is required. An inflatable jack is installed under the bottom of the vehicle. To be on the safe side, it is advisable to use a wooden stand that will interact directly with the machine.
This mechanism has one significant drawback. Since the cargo cushion is quite large, a low-slung vehicle will have to be first raised to install the device in question. If you attach a cart with wheels to the bottom of such units, you will get homemade ones for cars.
Comparative characteristics
The pneumatic version lifts the load due to the compression force of the air mass. Such modifications work from connection to additional equipment or from machine exhaust. The air mass enters the chamber. Thanks to compression and increase in volume, the car rises. The advantage of the models is that you do not need to make any special efforts, and if you have a compressor installation, the process takes a matter of seconds.
A mechanical jack for a car involves putting it into operation by rotating or twisting a special handle. Such modifications have a low price and compact size.
The principle of hydraulics is similar to the mechanical version. The difference lies in the simplification of the process of pumping out the working part of the jack, due to the presence of liquid in the working system. Such modifications have a long service life.
A mechanical jack with an electric drive operates from mains power; all the main work of the device is carried out by electricity. The advantages of the device are undeniable, but it requires connecting it to an outlet.
Security measures
Despite the fact that the inflatable jack is one of the most basic in operational terms, its use requires compliance with certain precautions.
To avoid the unit flying out from under the car, it must be installed correctly. Before installing a new pneumatic device, it is advisable to deflate it once without load, after which it deflates and stacks itself accordingly. To protect the jack from damage, it is better to lay a rug on the floor.
For the manufacture of the working chamber of the device, PVC-based materials are suitable. At sub-zero temperatures, such a structure hardens and becomes rough. As experts note, the optimal operating temperature is up to -10 degrees.
Hydraulic lifting device
It is quite possible to make a hydraulic jack with your own hands. It is based on a housing, the main load-bearing function is performed by a retractable piston and working fluid (oil). Variations of the device can be made with a shortened or extended steel frame. The housing serves as a container for oil and a guide cylinder for the piston.
A special adjusting screw with a lifting heel is screwed into the plunger; if necessary, you can increase the maximum lifting height. Such a device is equipped with a manual, foot or air drive.
The working mechanism and the retractable cylinder are located in the holes of the frame. The unit is lowered by turning the T-handle. Some devices are equipped with polyamide wheels for maneuverability. Operational safety is ensured by safety valves.
Pros and cons of a hydraulic device
Before making a jack with your own hands, you should consider all its pros and cons. The advantages of a hydraulic device include the following indicators:
- the device is unpretentious in maintenance and operation with a fairly high power rating;
- smooth movement of the working rod, reliable fixation of the load at the required height, precise braking;
- high efficiency (up to 80%) and load capacity (over 150 tons).
The disadvantages of using a hydraulic model include the high initial lifting height, the problem of accurately adjusting the lowering position, a decent price and quite a lot of weight. The device must only be stored and transported vertically, otherwise the working fluid may leak out.
Conclusion
Making a jack with your own hands will not be much of a problem. Depending on the capabilities, scope of use and other objective circumstances, you should choose the right model for the type of work. For use on the road, a compact device of a mechanical or hydraulic type is suitable, and in the garage, an inexpensive and practical pneumatic device will perform well.
What prompted me to take up such “creativity” was the statement about the “hard” work of copyists of other people’s homemade products. Let's call this a "test of the pen."
To make the task more difficult for myself, I completed it using a video clip.
I’ll say right away, may the author forgive me and let him search for his creation on the Internet. I present to your “judgment” MY “creation”.
Every motorist purchases a jack for maintenance when purchasing a car. There are different types of jacks, both purely mechanical and purely hydraulic. But they all have the main drawback, which is ease of use. It is impossible to install a jack under a car without bending over in a “triple bend”. There are more advanced ones for stationary use, but the cost of these is off the charts. This is the kind of jack we will talk about.
The author of the homemade product combined two types of jacks together. Here's how he did it.
Design features.
For his design, the author used a ready-made hydraulic jack, making an adaptation for it. The entire structure consists of a thick-walled 80mm channel made from a whole billet. The bends of the structure were achieved by cutting the side walls and further welding. From the photo you can clearly see the structure of the support rollers (wheels), I see no point in dwelling on them. For direct support on the car body, a rubber support is attached; it can be taken from the support pads of the springs, engine... modified to the required dimensions.
To install and fix the jack, a metal plate having the size of the base of the jack and a thickness of about 5 mm is welded (screwed) onto the lower channel. The main emphasis will be on the channel.
To fix the jack, two 8-10mm holes were drilled in its base, and two guide pins were installed in the base of the welded plate under the jack. This allows you to securely fasten the jack and at the same time freely remove it.
A piston pin from a car was welded onto the main jack rod, cut to fit the internal width of the channel. This finger rests on the moving part of the device and to prevent the jack from “slipping,” limiters in the form of two metal plates with a thickness of at least 8-10 mm are welded on both sides of the finger inside the channel. In this case, the finger should rotate there easily.
For structural rigidity, “kerchiefs” are welded. In order not to increase the weight of the device, they are not made of solid metal. The handle is also welded for ease of use.
Having rolled the device under the car, you, as usual, use the handle to begin lifting the main jack rod and thereby set the lifting lever in motion.
Due to the increased lifting lever, complete lifting of the entire lifting side is possible. Both wheels are not supported.
That's probably all about the manufacturing features of this design.
To give a homemade product a “look,” it needs to be painted.
What do you need to make such a “rolling” jack:
0. Head.
1. Ready hydraulic jack.
2. Thick-walled channel 80, around 1.5 m.
3. Metal plates with a thickness of 5 to 10 mm, 150-200 cm square.
4. Metal “round” with a diameter of 12-16mm. 1-1.5 meters.
5. Car piston pin.
6. Rubber "cushion".
Tool
1. "Bulgarian"
2. Welding.
3. Mechanic's tools.
Motorists, and especially those who like to spend a couple of free hours in the garage, are people who, at the genetic level, develop a talent for getting practical benefits from things at hand. They don’t have to be persuaded to try new experiments or try out a new way to fix, assemble, or remove something without owning a specialized tool.
Why invent something new when in three or four hours and practically for free you can assemble a jack with your own hands– a useful, practical and indispensable tool for every car owner.
The photo shows types of jacks and methods of their use
A car jack is a universal device that can support structures weighing up to two tons, and sometimes more, for days. It's like a third hand for a car mechanic: super strong, durable and one hundred percent effective.
The simplicity of the design and the abundance of varieties of functional tools allows you to make an exact analogue of any branded jack with your own hands.
How to make a screw jack
The classic and most common diamond-shaped jack is the screw jack. Make one like this DIY jack- a matter of two hours, especially if you have one and a half to two meters of channel and a basic set of fasteners. The compact tool will easily fit in the trunk, and in any emergency and unforeseen situation you will praise yourself for your foresight and intelligence.
Many people know how to assemble a jack from a channel, but have never tried it. There are only five elements, and the tool is already 90% ready:
- Levers made of bent steel channel with equal flange sides - 4 pcs;
- Channel fragments for the lower and upper arms (the lower arm can be replaced with a wider and more stable base);
- Rubber gasket (on the upper shoulder, for the jack);
- Axles holding the upper and lower arms (pins with heads on the axle, secured with cotter pins);
- A threaded screw secured to the shaft on one side.
At the preparatory stage, drill holes at the joints of the elements, and then begin assembly. Connect the shoulders, secure them together and on the bases. Insert a threaded screw into the shaft and check the homemade jack for lifting force.
The photo shows a diagram of the screw jack assembly
As you can see, a simple method that does not require welding and professional equipment (except for an electric drill), takes only an hour or two of time, and does not damage the budget.
How to make a jack from an air spring
It’s a completely different matter when a jack is needed for more serious work than, for example, changing a wheel on the road:
- Lifting vehicles weighing more than 2 tons;
- Work in the inspection pit;
- Professional activity in car service;
- Lifting a car in hard-to-reach places.
In cases where classic screw models cannot cope, homemade hydraulic jacks made from air springs come to the rescue: they are relevant not only for cars, but also for other heavy-lifting loads - safes, workbenches, large-sized furniture.
To build a homemade air jack, you will need a minimum of materials:
- Air spring from a bus or truck;
- Air hose + supply and bleed system;
- Cushion stand + car lining;
- Compressor (which, by the way, can also be made with your own hands).
Details about how to make a jack with your own hands from an air spring, watch the video https://www.youtube.com/watch?v=vg8z68ObTEA.
In the same way, you can make a pit “lift” (for an inspection ditch), or rolling jack: The type of air bag does not matter.
In the photo - pneumatic (rolling) jacks
How to make a rack and pinion jack
He always comes to the rescue when other models are powerless, and human imagination and physical capabilities are exhausted. A rack and pinion jack will help if you need:
- Raise the motorcycle to a height;
- Lift a truck, bus, train or truck body;
- Pull the car out of off-road conditions (mud, sand, swamp, stones);
- Raise the car by the towbar.
There are no secrets in how to make a rack model; it only takes three steps and about an hour of time:
- From the existing slats, weld one elongated one (1.5 - 2 meters, depending on needs);
- Weld a stable base to them;
- Put on top a jacking mechanism with a heel, found in the bins of the garage (or purchased by agreement with a neighbor).
If desired, it is possible to additionally make fasteners for such a device, allowing you to lift the car by the wheel rims.
Simple manipulations and a little spatial imagination will allow you to save money and assemble the device with your own hands, without which not a single replacement of wheels or other parts of the suspension is complete. And with the right approach and proper use of resources, a homemade jack will help you out in many situational troubles.
Since ancient times, people have been faced with the problems of lifting large loads to a height; for this, many people were usually involved, and bulky structures were erected, which were not always super-strength, and therefore often broke, causing casualties. A way out of the situation appeared with the invention of a machine such as a hydraulic jack, which is still widely used today. Such an installation, unlike winches, is more reliable and is capable of lifting large loads at lower costs.
Purpose of a hydraulic jack
Today it is impossible to imagine carrying out repair work on a car, be it suspension repair or changing a wheel, without the use of jacks - special mechanisms that are designed to lift a heavy load and fix it at the required height. The most effective are hydraulic jacks, where the working force is created using hydraulic oil and a piston.
The first mechanical jacks appeared in ancient times. And the idea of creating a hydraulic jack circuit specifically for a car arose unintentionally. Repairman Peter Lunati came across this idea in a hairdressing salon, being surprised at how easy it was for the hairdresser to fix the hydraulic chair at a certain height. In 1925, a complex platform lift with a hydraulic strut was made for a car.
Hydraulic jacks are distinguished by their lifting capacity, which ranges from one to several hundred tons, which allows them to be used in the repair of trucks and other heavy equipment.
Machine bodies or flooring, foundation slabs and columns are used as loads. Depending on the purpose of use, such equipment has different dimensions and designs.
A hydraulic jack is used to move, lift and secure loads. The device is used in the field of general mechanics and tire fitting work, and is also indispensable when preparing a car for a long trip to create balancing: the wheel is removed using a jack and balanced using special equipment.
Modern hydraulic jacks are widely used not only in service stations and car repair shops. They are successfully used in oil refineries, power plants and other industrial complexes. The highest level of performance and ease of operation have allowed this technology to be introduced into the domestic environment, which is why many owners have a hydraulic jack in their garage.
This equipment is capable of operating in horizontal and vertical planes, so it is widely used at the construction site and for tensioning reinforced concrete structures.
Hydraulic jack design
The main load-bearing elements of a hydraulic jack are the body, the working fluid, usually oil, and the retractable piston. The hydraulic jack has an elongated or short body that is made of hardened steel. The housing performs the following functions: it acts as a guide cylinder for the piston and serves as a reservoir for working oil.
The screw with the lifting heel is screwed into the plunger, turning the screw out, so if necessary, it is possible to increase the maximum lifting height. This type of jack is equipped with a hydraulic pump with manual, foot or air drive. The hydraulic jack is equipped with safety valves and other devices to ensure long-term trouble-free operation.
The lifting mechanism and retractable hydraulic cylinder, raised upward by a special platform, are located in the housing holes. The descent occurs by turning the T-shaped handle. The equipment has polyamide wheels, which provide the jack with maneuverability. The body of the extended range is used mainly for working with buses and heavy vehicles.
Working principle of a hydraulic jack
Any hydraulic jack works on the principles of communicating vessels using liquid. Before work, you must place the jack on a flat, hard surface under the car and press the lever with the valve closed until the car rises to the required height. The vehicle is lowered by smoothly opening the device valve counterclockwise.
The working hydraulic oil is pumped by a drive pump using a lever. Liquid enters the cylinder through the valve and squeezes it out. The reverse flow of liquid will be prevented by valves - discharge and suction. To lower the jack back, you need to open the valve on the pump, then the oil will flow from the cylinder back into the pump.
The presence of threads on the body of the jack, which is protected by a dirt-proof casing, threads on the rod and threaded holes in the base, guarantees unlimited possibilities for the use and operation of hydraulic jacks for crimping, clamping and bending. A high-strength support, made of hardened steel and installed on the rod, can protect the hydraulic jack from damage. The corrugated surface of the support prevents loads from sliding. The force of hydraulic jacks is regulated by a built-in pressure gauge.
Advantages and disadvantages of hydraulic jacks
Hydraulic jacks are among the most unpretentious for all their power. An important feature of hydraulics is the incompressible working material. Hence the smoothness of lowering and lifting, fixing the load at the desired height and braking accuracy. Hydraulic jacks demonstrate a high level of efficiency - up to 80% and a significant load capacity - up to 200 tons with little effort due to the large gear ratio between the cross-sectional surfaces of the pump plunger and cylinder.
But hydraulic jacks have a much higher initial lifting height than mechanical models. Another difficulty is the impossibility of accurately adjusting the lowering height. To maintain the jack in working condition, it is necessary to constantly monitor the oil level and control the tightness of valves and seals. Such jacks can only be transported and stored in a vertical position, as otherwise the liquid may leak out of the tank.
The disadvantages of hydraulic jacks arise from their advantages. They are relatively slow - one cycle of pump operation corresponds to a not too high lift height. The disadvantages include the large weight and size, the high price of a hydraulic jack, as well as a small stroke for single-plunger models. In addition, these tools often experience more serious breakdowns and malfunctions than mechanical devices.
Classification of hydraulic jacks
There are several types of hydraulic jacks.
Bottle hydraulic jacks
The design of a bottle (vertical) hydraulic jack is the simplest. The scope of use of such jacks is quite wide due to the large range of lifted weights - from 2 to 100 tons. “Bottles” are used in trucks. In addition to the main advantages of a hydraulic jack, vertical models have several more - versatility of use, compactness and a large support area.
There are single-rod and double-rod bottle jacks. The hydraulic single-rod apparatus is characterized by its simple design and ease of operation, which expands the scope of its use and allows it to perform work of any complexity: installation and dismantling in mechanical engineering, construction, repair of cars, wheels of railway cars, use as a power unit of a press, pipe bender, pipe cutter and similar tools .
A telescopic double-rod jack has a similar design to a bottle-type jack; the operating principle of a bottle-type hydraulic jack is based on the use of several working rods. The piston is located at the base of the telescopic jack. It can be used in horizontal and vertical positions. It is compact and fits most cars. Lifting occurs using a lifting lever driven by a hydraulic cylinder.
Rolling jacks
A rolling jack works on a similar principle to a bottle jack, but with the difference that the axis of the working cylinder is not located in the vertical axis, moreover, the piston is not directly aligned with the pick-up and the lifting lever is activated. This device is called a rolling device because it is a cart on wheels that can roll on a flat surface. When the lifting arm and lever are raised, the jack “rolls up” or moves under the load.
Such a jack is driven by the same swing of the lever as bottle models, and is lowered in the same way - by turning the valve screw. If it is necessary to lower the load down, it is necessary to place the tubular handle on the valve screw, after which the partition will fit into the groove of this screw. By rotating the handle around its axis, the user rotates the screw accordingly, relieving the pressure in the working cylinder and lowering the load to the required height.
Most often, a rolling jack can be found at a tire service station, because it is ideal for lifting one side of the car and is quite quick to operate and install. The disadvantages of this design follow from the name - a rolling jack needs a flat, hard surface, concrete or asphalt, to work. In addition, the significant size and weight make it difficult to transport the unit in a car.
Rolling jacks are classified by purpose, as in the photo of hydraulic jacks:
- For personal use by motorists, with a carrying capacity of up to 3 tons;
- For car services and tire shops, with a lifting capacity of up to 4 tons and with pre-lift pedals to instantly achieve the required pick-up height;
- For servicing heavy machines and special vehicles (forklifts), with a lifting capacity of up to 20 tons and with pre-lift pedals and a sliding crossbeam, which is designed to lift one side of the machine.
Transmission rolling jacks are equipped with a special rotating frame. Here the smoothness and precision of hydraulic jacks is demonstrated in all its glory. The gearbox of a car that is being mounted or dismantled can be precisely fixed in a horizontal or vertical plane in the desired position.
Hydraulic hybrids
Two-level jacks are needed mainly in car repair shops, where they work with different cars. The features of this device include two lifting platforms. The drawing of a two-level hydraulic jack is generally a hybrid of a rolling jack and a bottle jack. To be more precise, a two-level jack is used at a height of 65 - 375 millimeters from the ground as a rolling jack and at a height of 375 - 687 millimeters as a telescopic one. When working with the lifting mechanism, use a hand lever and a foot pedal.
The pneumohydraulic jack combines hydraulics and pneumatics. It can be manufactured in a rolling solution and has a load capacity ranging from 2 to 80 tons. The initial pickup height is low. It is used exclusively as equipment for car service.
Hitch jacks
Low-lifting toe jacks are widely used wherever a low lifting height is needed: for installing and dismantling various equipment, for lifting rails on the railway, as well as in auto repair shops. It is precisely this low pick-up height, which ranges from 15 millimeters, with the possibility of step-by-step adjustment, that is very convenient when assembling mechanisms and acts as the hallmark of a hook jack. But this jack is based on a simple bottle-type device.
Diamond jacks
Hydraulic diamond jack is mainly required for lifting machines during repairs. It is characterized by high reliability when compared with its screw relative, and is practically not inferior to it in ease of use.
In a diamond jack, four levers act as load-bearing elements, which are connected by hinges. The operation of a hydraulic jack and lifting loads is based on changing the angles between the levers. The advantages of diamond jacks include their small dimensions, which provides convenient storage, transportation and, at the same time, a significant supporting surface and structural rigidity. Relatively low pick-up height.
Manufacturing of hydraulic press
When a car enthusiast independently services his entire vehicle fleet, one of the most necessary tools is a press. We suggest you make your own press from a hydraulic jack, which will become a reliable companion when performing a whole list of work. With its help, you can punch holes in different materials, press inserts and bushings, and press metalworking waste.
Assembling a hydraulic press is not that difficult. For this you will need a welding machine with the required number of welding electrodes, a hacksaw, an angle grinder with a metal disc, a thick-walled steel profile to construct the press. The functions of the power unit, which exerts the required operating pressure, are performed by a hydraulic jack.
The first unit of the hydraulic press is the support platform for the jack. Since the resulting pressure will be proportional to that applied to the base and upper working units, the strength of the base should be maximum. This can be achieved by making several stiffening ribs on the base. To make the base, take a steel square or rectangular profile that has a size of 40 by 50 or 50 by 50 millimeters and cut 4 parts about 250-300 millimeters long using the above tools.
After this, it is necessary to lay these parts with the side walls facing each other and weld the joining seams at the top and bottom to increase the rigidity of the base of the press. To ensure greater stability of the hydraulic jack, weld a steel plate to the resulting structure, the sheet of which has a thickness of 8 -12 millimeters and a size of 250 by 200 millimeters.
The next stage in the manufacture of a homemade press from a jack is the production of a stop and racks. To do this, you need to saw off 2 parts from a profiled thick-walled rectangular or square pipe of the required length. To calculate it, you need to clarify the maximum stroke of the rod using the instructions supplied with the jack and add the height of the hydraulic jack itself and the support platform to the resulting size.
Make the stop from the same material as the racks. The length of this part must be equal to the width of the support platform in order to maintain the overall geometry of the structure. Connect the stop and the resulting posts with a weld and weld the U-shaped structure to the base.
When performing such assembly operations, it is recommended to use a simple device that ensures the perpendicularity of the parts to be joined. On a steel sheet that is at least 10 millimeters thick, two pieces of steel corner 40 by 40 millimeters should be welded at an angle of 90 degrees. Place the parts to be connected later in this device and weld.
This way you can achieve the desired connection angle. For additional convenience, this improvised square is additionally equipped with clamping devices that fix the parts to be joined and prevent the connection angle from being violated due to thermal changes during welding in the metal.
The next mandatory element of our press is a removable stop that can move along the guides and transmit pressure from the central working rod of the hydraulic jack to the workpiece. To make it, prepare several pieces of steel strip, which is about 1 centimeter thick. Make the length of the parts less than the resulting distance between the posts. Connect the resulting parts in several places by welding on both sides.
To ensure quick replacement of this part when performing any hydraulic work and to fix the element when moving on vertical posts, it is necessary to drill two through holes in the resulting block of steel strips and saw off two plates; their length should be 100 millimeters longer than the length of the block. Also drill two holes in the plates that match the holes in the block.
When installing the block on the press frame using a hydraulic jack, select two bolts of the required length with nuts and washers with your own hands and connect the resulting plates to the block so that they are located on both sides of the racks. If there is a need to achieve less free play of the hydraulic jack piston, the space between the moving stop and the upper beam of the structure can be reduced by additionally installing an intermediate square profile.
To do this, saw off a section of a square profile that has a length that is equal to the distance between the posts, and attach it at an equal distance with the welds. This will significantly reduce the working distance of the hydraulic press and reduce the time spent on certain types of work.
To further reduce the stroke of the working rod of a hydraulic jack, you can use additional replaceable inserts, which are made of solid or hollow steel profiles or replaceable anvils. To create them, you should saw off several parts of different thicknesses and additionally mark them for quick and thorough selection of the desired element.
Hydraulic jack repair
Hydraulic jacks periodically require maintenance, so it is necessary to add liquid to the working cylinder, which flows out during operation through oil seals and various seals. In addition to oil leakage, malfunctions of the jack include jamming when lifting a load to a certain height, the inability to lower the jack after lifting, or the inability to lift even a light load.
Oil leak
To repair and test a hydraulic jack at home, you should buy the necessary repair kit for the equipment. Before performing repairs, you must first disassemble the device. An extension to the keys may be required to provide significant force and greater leverage. Be sure to prepare a container to drain the old oil and prepare new working fluid.
After this, the pistons should be removed and checked for corrosion. All dirt and corrosion are removed. Check to see if the stem is bent. If deformation occurs, then it is unlikely that it will be possible to make it even again and there is no need to repair anything further.
It is necessary to check the oil bypass valve. To do this, the valve is unscrewed and checked for deformation or dirt getting inside the valve. If the valve is faulty due to mechanical deformation, then it should simply be replaced. In addition, it can simply become dirty, and the ball will not fit tightly into its seat. This is the reason for the passage of working fluid.
Completely drain the old oil. This procedure is quite simple, although it takes a lot of time while the oil flows from one cylinder to another. The liquid is drained by pumping the system, moving the lever up and down. Wash all parts thoroughly to remove dirt and oil residues. Completely replace all cuffs and gaskets.
Another reason for the failure of a hydraulic jack may be dirt that has entered the working cavity. To remove it from there, you need to unscrew the head of the housing, pour kerosene into its base and pump the jack with the locking needle unscrewed. Upon completion of the operation, kerosene should be removed and clean oil should be poured into the working cavity.
Air entry
During long-term operation, air bubbles accumulate in the working cavity of the jack, significantly reducing its effectiveness. The reason for this is usually air that has entered the hydraulic system due to a lack of operating oil. You can fix this problem as follows.
First, open the oil tank cap and bypass valve, and then quickly pump the hydraulic press pump several times. In this way, air will be forced out of the working cavity into the oil container. You can then close the bypass valve and the hole leading to the oil tank. If you did everything correctly, the air will be removed and the jack will work normally again.
If your attempt is unsuccessful, repeat all of the above steps. However, this method is not the only one for removing air from the working cavity. It is not difficult to determine the presence of air in the working cavity: the jack does not work at all, or the load is lifted slowly.
First, unscrew the locking needle one and a half to two turns, then lift the plunger by hand by the screw to the uppermost point and release it so that it is again in the lower position. Repeat these steps twice or three times. To prevent a similar problem from arising in the future, it is worth periodically checking the oil level in the hydraulic jack and adding working fluid if it is insufficient.
Thus, you have become familiar with the design of a hydraulic jack, studied its advantages and disadvantages, understood the classification of such equipment and understood how a hydraulic jack works. Now you can start assembling the device yourself. And don’t forget about periodic maintenance and adding operating oil.