What kind of oil does the hydraulic jack contain?

Design of a bottle jack

As can be seen in the illustration, the hydraulic bottle jack consists of the following parts:

Ask Jack Anything: What Hydraulic Fluids Should QuickJack Use?

kind, hydraulic, jack

Fig 1. Design of the bottle jack: 1. Main piston 2. Lever 3. Stem 4. Suction valve 5. Shutoff valve 6. Oil storage tank. 7. Working chamber. When the lever (2) is actuated the rod (3) creates pressure which opens the valve (5) and the fluid flows into the working chamber (7). When the lever is pulled up, the shutoff valve (5) closes and the fluid is drawn into the pump cavity from the oil storage tank (6) by the pressure of the suction valve (4). By pumping the fluid from the reservoir (6) into the working chamber (7) the main piston (1) is raised.

In the arrangement of work, everyone knows Pascal’s law: the pressure exerted on a liquid or gas is transmitted to any point without change in all directions.

The design of a bottle jack is simple enough, we pump fluid from one reservoir to another and thus build up pressure in the second reservoir, at the expense of which we raise the working piston.

The role of oil in a crane hydraulic system

The hydraulic tank on a truck crane is located behind the cab The hydraulic oil in a truck crane performs several tasks at once. Ono:

If to fill up the hydraulic oil in the truck crane less often than it is necessary, it may cause unpleasant consequences. For example, excessive contamination of the hydraulic fluid can lead to premature wear of the rubbing surfaces. The whole hydraulic system will break down over time.

Not all hydraulic oil in a truck crane can be used. only mineral oil will do. Suitable hydraulic fluids and their performance data are given in the table below.

Mineral oil grade Viscosity at 50 degrees, mm2/s Operating temperature range Minimum starting temperature
Short-time operation Continuous work
VMG3 11 -45. 70 -40. 60 – 45
MGE-46B 30 -15. 75 -5. 70 – 15
MGE-22-A 13 -30.65 -15. 60 – 30
I-30A 27-33 -10. 75 0. 70 – 10

It is important to make sure that during operation the hydraulic oil in the truck crane is not heated above the maximum value of the temperature range. In addition to oil, the crane can be filled with additives with antioxidant and antifoaming properties.

What kind of oil do you fill in the hydraulic elevator?

At 95-97%, the majority of parking elevators have an electro-hydraulic drive of the parking platform. Electro-hydraulic drive for all manufacturers of parking cranes consists of approximately the same components. electric motor, hydraulic pump, oil tank, hydraulic hoses and hydraulic cylinders. The difference may consist only in the type of hydraulic pump. submersible or external, and a couple of other little things. Electromechanical parking platforms are hardly ever produced due to low speed of movement of the parking platform and high mechanical wear of the actuator, which is a worm drive mechanism.

Stable and reliable operation of the parking-lift requires hydraulic oil with certain characteristics defined by the manufacturer. A wide variety of hydraulic oils on the market differs by the class, application field, composition. But which ones are suitable for the hydraulic system of a parking elevator?

To find out which characteristics of the hydraulic oil is right for your hoist you need to understand the conditions in which it is going to operate or is already in use. The basic and main condition for choosing the hydraulic oil is the temperature range of the environment in which the hoist is operated. In 98% of cases the hoist is located in a heated garage, the hydraulic system is not subject to temperature fluctuations. In this case, it makes sense to use a hydraulic oil with a viscosity factor of 46. What oils with this viscosity grade have in common is that under normal conditions, t. е. At 40 °C, their viscosity (flow rate) is the same at 46 centistokes per second (sqa/m2 ), giving an average temperature of 40 °C. mm/s). Some manufacturers have specific designations indicating additional features of their hydraulic oils (mobile hydraulic systems, equipment, etc.).п.)

To keep the hydraulic actuator working, it needs a special fluid to protect it from wear and tear. Hydraulic jack oil helps the jack system perform under various temperatures and humidity conditions.

Top Oil Requirements for Hydraulic Jacks

What are the requirements of hydraulic jack oils??

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Different formulations can be used as hydraulic fluids. They can be based on mineral or synthetic raw materials, have different viscosities, include a variety of combinations of additives.

However, there is a certain set of requirements which these fluids must satisfy:

  • Pouring compounds must have good filterability and low foaming. Air in the system in the form of bubbles in the oil prevents proper operation of the mechanism, reduces the lift height and can lead to dangerous situations
  • Jacks are most often operated under conditions of moisture, dust, and dirt. To maintain the performance of these devices over long periods of time, their parts must be reliably protected against the formation of corrosion. So the oil to be filled must have good corrosion protection properties
  • The viscosity and viscosity index of the operating-liquid should be chosen according to the operating conditions. Oils with a low viscosity index will make jacking difficult or impossible in colder temperatures. Low viscosity fluids, on the other hand, will not provide sufficient lubricating and sealing functions
  • Another requirement for the fluid to fill is dictated by the specific design of the device. The rubber, from which the seals are made, may not be resistant to some of the compounds. Such parts will rapidly deteriorate, causing failure of the whole mechanism. It is therefore possible to fill only those oils that are compatible with the materials of the rubber seals

What you should not fill the jack with?

Let us consider the possibility and the consequences of filling the jack with various compositions.

Theoretically, the device will work, even if you fill it up with water. In such a case there will be intensive corrosion on the surface of the details that will quickly put the mechanism out of order.

Another popular misconception is about the use of brake fluids. They should not be used in jacks!

They accumulate moisture due to high hygroscopic properties, which will cause corrosion on the parts.

Recommended lubricant grades

As working fluids are successfully used spindle oil I20A, conventional industrial oils of brands VMGZ, I12A. I30A, I40A or I50A grades have a higher viscosity, so they will be effective only in warm seasons for some models. However, it is still better to fill in special hydraulic fluids of low viscosity as they have the optimal ratio of functions and properties that meet all the requirements.

Types, properties and characteristics of the hydraulic bottle jack

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

Fig 2. Single rod jack

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

  • Manual, driven by user pressure on the lever
  • Large pumps designed for lifting huge weights, driven by a separate drive, hydraulic pump or hydraulic power unit.

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Fig. 3. Double rod jack

The load capacity, an important parameter in determining the maximum weight to be lifted. The parameter depends on the volume of the working chamber and the strength characteristics. Bottle-type units have capacities from 2 to 100 tons.

Minimum lifting height, also called minimum lifting height. This is the height at which the load must already be in order to be able to place the jack under it. Pay attention to the minimum height if you choose the device for the car. If you have a low clearance (ground clearance), the bottle-type device due to its high construction will not work for you.

Maximum lifting height. Height at which the load can be lifted. Bottle ones have a special feature, there is a retractable screw on the support platform that increases the minimum and maximum lifting height.

Jacks characteristics

There are different types of elevators, each of which has its own distinctive features and peculiarities:

  • Mechanical jack. this is the most famous equipment, distinguished by its low weight, fast working stroke, high level of lifting and low cost. Its disadvantages include low stability, as mechanical equipment has a small support area.
  • An electric elevator is equipment that is controlled with a special small unit and operates from the car’s electrical wiring. This jack can lift up to two tons of weight. Among the disadvantages are its heavy weight and manual lowering, which requires a lot of time.
  • The pneumatic jack works from a compressor or compressed air, it has a small weight and a large support area.
  • Hydraulic equipment is the most popular and is used both during the repair of vehicles, and during construction work to lift various heavy structures. Load capacity of hydraulic jacks is up to 200 tons and efficiency reaches 80%. However, there is a disadvantage with this jack as well. it cannot be transported in the lying position, because the mechanism of the equipment can fail.
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For qualitative work of the equipment it is necessary to use special oils. Such compositions are divided into several groups and have their own purpose.

The jacks are serviced with hydraulic compounds, the choice of which requires care and responsibility.

How to properly pour oil into the jack

The range of jack applications is much wider than just using it to change tires on the car. Any experienced car owner knows when to use this device. But besides the rules of operation, it is important to know how to properly perform the maintenance and replacement of the hydraulic material.

Unlike existing lifting mechanisms jack has small size and weight, easy operation, has the convenience and high degree of reliability. For every car owner such a tool. a thing necessary and very important.

There are several basic types of jacks:

Can be operated manually or electrically. Some models can handle loads up to several hundred tons.

Hydraulic jack

A hydraulic jack is a device that allows you to lift and hold heavy objects at a given height. With this mechanism you can do the following manipulations:

  • lift and hold the car body in the process of repair work;
  • perform the lifting of the bridge span;
  • perform tensioning of high-voltage wires;
  • transport of construction loads and equipment;
  • piping.

There are single and double plunger models. According to the type of construction mechanisms can be:

Why the hydraulic models are considered to be the best in the range of jacks? They have significant advantages:

  • high efficiency (80%);
  • smoothness and noiselessness;
  • the rigidity and strength of the design;
  • braking and stopping in exactly the right place;
  • high load capacity.

But in addition to the pluses, it is necessary to note the minuses of design:

  • Transportation is required in an upright position to avoid oil spillage;
  • low speed
  • lifting at a low height;
  • inability to set the height when lowering the load.

Capacity range of hydraulic models is from 2 to 200 tons. The most popular model is the bottle design, as it is the easiest to use.

The jack jack can only work on a level and hard surface. This mechanism is mounted on wheels and has a rather large lever, which makes it difficult to reduce the force if necessary.

Checking oil level and keeping it clean is essential for long time trouble free operation.

Choice of material

Car enthusiasts often wonder what kind of oil is needed for the jack.

Tip: Choose only high quality oil and never mix it with any other fluid, including brake oil or other types of grease. Mixing it up will cause damage and risk losing the load during the work process.

The jack must be filled with quality oil meeting the following specifications:

  • the lubricating fluid should be well filtered;
  • the level of foaming is as low as possible;
  • the viscosity index and temperature limit should be chosen as high as possible
  • high index of anticorrosive protection.

To fill jacks, use fluids of brands I30A, I40A or I50A, used in operation of industrial machines. Optimal option. special hydraulic oil.

Filling mechanisms

Here’s how to properly pour the recommended oil into the jack. Sometimes, if transported incorrectly, the hydraulic fluid can pour out, and the voids are filled with air. This will cause the jack to malfunction. If this happens, the oil must be changed.

The rack and pinion mechanism is quite large and is used not only to lift the body, but also to repair old structures. Before changing the lubricating fluid, you need to put the mechanism all the way down. To be sure, it is possible to release the residual tension by turning the discharge valve anticlockwise.

The filler neck is usually located on the side of the reservoir body, often on the bottom of the cylinder. The bottle neck must be loosened from the bolt or plug, which are reliably protecting the oil in the bottle. Then you need a grease gun, the nozzle of which should be inserted into the bottle neck and primed.

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The hydraulic oil is sufficient when it starts to overflow. Now you just have to tighten the bolt or plug with force.

Pouring the lubricant into the bottle jack will have to be a bit different. The oil level in the oil filter has some special features, but first make sure that the jack is lowered all the way to the bottom. The same method as for the rack and pinion mechanism can be used to secure the system.

In a bottle design, the plug should be looked for on the top of the master cylinder body. Firstly the plug is removed and the filling is carried out using a grease gun, which is pre-filled with hydraulic oil, removing the air from it. The oil level in this case should be about 1/8 inch below the oil fill hole.

Changing the oil in a hydraulic jack has its own peculiarities. The mechanism should be disassembled and cleaned before filling. The piston can get dirty and rusty. Next, the gaskets should be inspected (they wear out rather quickly), and replaced if their integrity is compromised.

Tip: when draining old oil, you may lose the metal ball located in the valve. Without this small part, the jack will not work. Drain as gently as possible.

Do not open the valves yourself. This can cause failure of the entire assembly.

Before you fill up with oil, pump the mechanism so that it is free of air and drain the old fluid. The oil can then be filled through the filling opening. It closes tightly with a threaded plug.

The required level is marked by a marking on the housing. When the level is reached, screw in the plug and pump the mechanism to get rid of any air s. The piston should be raised to its maximum. Then unscrew the cap again and fill and pump through again. repeat this procedure several times until the fluid begins to flow out. This indicates proper priming. This procedure is easier to perform with an assistant.

As you could see, filling and changing the oil in the jack is quite simple, you just need to follow the recommendations that you learned in this article and do this operation yourself will not be difficult.

The main thing that is required of such oil is to carry out transmission of energy during control, movement and drive. This fluid is indispensable for maintenance of bridges, industrial mechanisms, locks and various apparatuses which need lubricant.

There are different types of hydraulic oils:

  • oil for industrial equipment and vehicles;
  • Marine oil;
  • oil for aircrafts;
  • oil for shock absorber and hydraulic brake systems.

Each type of fluid has its own composition, and therefore there is also classification “A”, “B”, “C”:

  • “A”. mineral oil without additives;
  • “B”. with anticorrosive and antioxidant additives;
  • “B”. purified oil, which has anti-corrosion, anti-wear and antioxidant additives in its composition.

Repair and maintenance

In order to service a bottle jack, it must be disassembled. You don’t have to worry about getting splashed with oil from the high pressure. It is quite possible to do this yourself. First of all we need to drain out the oil.

Drainage is performed through the fill hole, or through the by-pass valve if it is absent, to do this unscrew the upper hex nut and unscrew the lower cock. Remove the shell, check its tightness, assess the condition of the lower rubber ring.

These parts do not carry any load, they are simply the reservoir for the fluid. Next, unscrew the master cylinder and remove the piston. Inspect everything carefully for rust. If any rust is found, get rid of it as thoroughly as possible. Unscrew the ram, check its performance, examine the o-rings.

Inside there should not be any iron chips, parts should not have dents. Seals that have worn out should be replaced with new ones. Do not forget to wash thoroughly all valves from dirt and various deposits. We reassemble it, and that’s it, the repair is done.

A hydraulic jack is a mechanism designed to lift a variety of different and fairly large loads. The main feature of the hydraulic jack is that it can lift up to 50 tons using only the efforts of one person.

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