Oil for the mobile hydraulic jack

Hydraulic jacks are rather more popular. They can be used for lifting various heavy loads. The operating principle of the design determines that the required pressure is created by feeding a special oil into the working chamber. Periodic maintenance involves replacing the oil in the hydraulic jack, because it can lose its properties over time. That’s why it is necessary to pay attention to the characteristics of the oil for hydraulic jacks.

Brake fluid is used in some cases. It is worth bearing in mind that it is only partly suitable as a working medium for lifting gear. This is due to the high level of hygroscopicity. After a period of time after the brake fluid has been used, the water contained in the brake fluid causes the onset of a corrosive process. That is why experts do not recommend using such a liquid to operate the hydraulic jack.

The above information indicates that no special equipment is required to change the oil. The level is replenished to the mark indicated by the manufacturer on the body. Too high or too low a level will cause the lifting mechanism not to work properly.

Hydraulic jack arrangement

Hydraulic jacks are designed to contain fluid. They can be by device:

A distinction is made between trailing, jacking, double-headed, bottle and diamond-shaped hydraulic jacks.

The design of any jack is made up of the following parts:

  • the housing is the cylinder in which the oil is poured;
  • lever;
  • piston or plunger. is inserted into the housing and is the main working element;
  • drive handle;
  • discharge and suction valves;
  • discharge pump.

Fundamental characteristics

What oil to pour into the hydraulic jack is determined depending on the tasks, taking into account the characteristics of the fluid.

The viscosity of the hydraulic oil determines the ease of movement of the individual parts of the machine, so it must be neither too thin nor too thick.

The higher the viscosity index. this is a temperature indicator. the better, so the unit can operate at low temperatures.

Filtration is also important: the oil must flow easily through the filter, removing gases and foreign substances at the same time.

What oil to pour into the hydraulic jack: what will provide reliable protection of the unit from wear, what is compatible with the materials from which the individual parts are made, and what is recommended by the manufacturer of the unit.

Good oil for hydraulic equipment does not oxidize, does not change its performance when the temperature conditions or chemical composition of the environment change, which increases the service life of both the technical liquid and the unit. Bad oil is bad for the equipment and can lead to hydraulic equipment repairs.


Almost all oils intended for hydraulic equipment are produced by refining base oils produced in the process of refining oil fractions. Modern technologies are hydrolytic and extraction purification. To improve the quality of oils special functional additives are added, thanks to which the liquid does not form foam, protects parts from oxidation and corrosion.

What oil to pour into the hydraulic jack in the summer season? Any, but in winter it is better to use synthetic, which will retain all its properties even at subzero temperatures. But it is better to send the unit to a warm room when it is not working.

How to fill a hydraulic jack with oil is described in the jack’s instruction manual. Usually the procedure is repeated at least 2 times a year, with intensive use of the unit requires more frequent maintenance up to monthly. When the fluid is changed, the system must be flushed, and sometimes the hydraulic valves must be repaired.

During repair of vehicles, on construction sites, during loading and unloading, you may need such a device as a hydraulic bottle jack. Because of their versatility, jacks are used everywhere. I can’t imagine what you were doing without this thing at the service station.

However, sometimes you have to tinker with the jack. Previously I did not know how to fill it with grease and what would be the best solution. That’s what my next review will be about.

Let’s get to know each other!

As the name implies, the hydraulic jack works on liquid (oil). It is his leakage through the glands and valves is the most frequent type of failure of the tool. Therefore, when working with this type of jack, it is recommended to monitor its condition and the presence of oil in the reservoir. In addition to oil leaks to the problems of the hydraulic jack can include corrosion, leading to limitations when lowering the mechanism, and the bending of the rod from excessive load.

Do not forget about the timely maintenance of the hydraulic jack, the need to replace the o-rings and the oil itself. However, before running headlong to buy tools and look for places to fix parts, it is worth studying the instructions that come with the jack.

If it is not available, contact the manufacturer. Even better to find a video on the Internet, where someone before you disassembled a device of this type. Also, do not forget to buy a repair kit for your jack. Its not including delivery (for Moscow and Moscow region). Agree, it is much cheaper than buying a new device.

What greases should not be put in the jack

If you think that any oil or grease can be poured into the hydraulic lifting mechanism, and its efficiency will not decrease, you are mistaken.

The construction will be able to function normally for some time, but the service life will be considerably reduced. If you’re lucky, you won’t notice problems when your favorite car is lifted. If you are unlucky. the consequences can be very dangerous and unpleasant.

Experts do not recommend filling the jack with brake fluid. It contains too much water, which will quickly lead to rust in a closed space of the elevator, and even rarely used.

Other “contraindications” experts do not allocate, but still be careful and do not try to save money on buying products from an unknown manufacturer or similar to the oil lubricants. This is the only way to protect the unit from being destroyed.

Operating principle of the hydraulic jack

It is based on the communicating vessel principle. Force (motor or hand-operated) is applied to the actuator handle. The lever is used to force the oil into the delivery pump. Oil is forced to the bottom of the cylinder when the lever is actuated or the electric motor is started. The piston rises. A by-pass valve, consisting of a pressure valve and a suction valve, holds the oil pressure at a constant working level. The suction valve is located at the tank inlet and does not let the oil back in when the piston is lowered. A discharge valve is installed in the cylinder inlet and prevents oil from escaping while the piston is being raised.

To relieve the pressure and lower the load, open the valve by means of a special screw.

What is the difference between hydraulic jacks and other types of lifting equipment?

  • Smooth and quiet operation thanks to the fact that the working fluid is not compressed;
  • very stable;
  • the design is rigid and sturdy
  • small dimensions;
  • precise braking
  • low effort and high efficiency (up to 80%)
  • precise stopping;
  • high load capacity.

The hydraulic mechanism can work with objects set very low, lifting them off the floor. it is a big advantage over other types of lifting devices.

  • low operating speed;
  • low lifting height;
  • inconvenience of transportation (must be placed strictly vertically to avoid oil leakage)
  • load lowering height cannot be adjusted.

In the event of a breakdown, repairs are more complicated and expensive than their mechanical counterparts. The hydraulic lifting device handles loads weighing from 2 to 200 tons.

Special purpose devices are able to lift very bulky loads to a great height, fix and hold.

The hydraulic bottle jack single rod is very easy to use, which is why its variations are most widely used.

The jackstand has a low fit, mounted on the wheels. Lifting levers come out of the housing. Usually this type of machine has a drive handle that is large enough to reduce the forces exerted. This type of machine should only be operated on a firm and smooth base.

Long-term operation of the jack is possible only if the rules of use are followed precisely. One of the prerequisites is timely oil refilling, control of oil level and cleanliness.

Rules and Advice

It is not enough to change the oil. It is important to preserve its properties and increase the service life of the trolley. Helpful hints:

  • Store oil correctly. in clean, closed containers (canisters).
  • Be sure to clean the dirt in the system before pouring.
  • Fill up with new fluid from a clean container.
  • Do not store oil that has “come into contact” with air for more than 2 years.
  • If you drain the oil for repairs, make sure there are no foreign objects or debris in the oil before pouring it back in.

How to properly pump a hydraulic jack

Jacks are used by people for one purpose or another. They help to make all kinds of repairs. Jacks are very popular today. They are used by both ordinary car enthusiasts and professional car repair shops.

fill, hydraulic, jack

Hydraulic jack scheme.

The most popular jacks are by right the jacking jacks. They have a high load capacity, and in terms of use are considered the easiest. But in some situations, problems can arise even with such reliable equipment. The hydraulic jack can lose its original characteristics over time. In this situation, you should think about pumping it. This is quite a difficult task, which can not cope with every person. Below we will talk about how to pump the hydraulic jack.

Causes of decreased efficiency

Due to its special characteristics, the jack is designed to work with fluids, which provide a high lifting capacity. often than not, it’s oil. A special hydraulic version of this fluid is used here.

For the jack to work for a long time it is necessary to monitor the presence of oil in it and the condition of the seal and valves.

Basically, this design is considered one of the most reliable. It is capable of handling a wide variety of weights. Sometimes the lifting capacity of such a jack can reach several tens of tons. Coefficient of performance is the highest of all members of the class of such equipment.

However, no one is immune to the fact that the hydraulic jack will fail. There could be several reasons. The main reason is often the accumulation of air bubbles in the working area. This is detrimental to any hydraulic device. Very often this leads to the fact that it is necessary to pump the hydraulics. Air bubbles can dramatically reduce the efficiency of this type of device.

It is absolutely necessary to regularly check the oil level in the hydraulic jack. If its level is reduced, it is detrimental to the entire operation of the device. The free space is quickly enough filled with air bubbles. In this case the operation is sharply impaired. It directly affects the lifting capacity. There are many methods that allow to eliminate such a malfunction. All of these have a right to exist. Here are a few options on how to do it. So, we can proceed directly to the instruction.

The design of the hydraulic jack.

  • It is worth starting with the most primitive method of how you can pump the jack jack hydraulic. All work starts with opening the bypass valve and the oil tank plug. After that, every effort should be made to pump the hydraulic jack pump quickly. With this action, it is easy to ensure that all air from the working cavity flows into the oil storage tank. Now you may safely close the bypass valve and oil reservoir plug.
  • Basically, all air bubbles must be removed from the working cavity. If everything has been done in accordance with the instructions and in the most correct manner, the pump should work with the same capacity as originally. This can be easily checked in practice. If everything is normal, you can continue to operate the hydraulic jack without any problems. There are situations when such a procedure does not allow for complete air removal from the work area. In this situation, you can repeat the procedure several times at once. This gives life back to the device. However, it is worth noting the fact that this is not the only method of pumping. There are other methods that are also effective. The following is a universal method, which will surely help everyone get rid of the air in the hydraulic system.
  • If the jack does not work at all or does not work one hundred percent of its functionality, you can always use the following method of troubleshooting. It is worth paying attention to the shut-off needle. It is unscrewed by 2-3 turns. Very easy to find. It is available in the construction of any hydraulic jack. Any accompanying documentation always shows this needle. Now you can raise the screw to the extreme upper point, and then release it. This allows it to be positioned in extreme low position. All further steps are very simple.

Now you simply need to do this operation two or three times. After that the problem should be eliminated. If this does not happen, you can try to do the same. In fact, very simple actions should always lead to a positive result.

The oil level in the hydraulic jack must always be checked during work.

fill, hydraulic, jack

If it is found to be lacking, then it is imperative to refill it after each action. In fact, it is not always just air that can cause malfunctioning of the hydraulic jack. In some cases it will be necessary to remove the dirt from it. It can also be the cause of many breakdowns.

So, now it is worth getting rid of dirt, which may accumulate in the hydraulic jack. This is actually quite easy to do. First of all you have to unscrew the head of the housing. The locking needle can also be unscrewed. Next, in the working cavity should be poured kerosene. This substance can be purchased today without any problems at any specialized store. Now all that’s left is to pump the jack with the stop needle unscrewed. This will remove and destroy all excess dirt.

fill, hydraulic, jack

After all work is complete, be sure to remove all kerosene from the working cavity and fill it with clean hydraulic oil. As a result, all dirt is removed from the jack. It can now be operated again at one hundred percent capacity.

For the mobile hydraulic jack to work correctly, it is imperative that only hydraulic oil is used. This is because it is the only substance that can provide the necessary viscosity. Simple engine oil has a lower viscosity. It doesn’t even work properly without air. In production, when it comes to important equipment, people always use only hydraulic specialized oil.

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