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How Do Hydraulic Jacks Work?

Hydraulic jacks are essential tools in various industries that help with heavy lifting of different kinds of weights. These jacks use the power of hydraulic fluid or oil to move or lift heavy loads. The main mechanism of applying force differs from the jack type used, but it generally relies on a hydraulic cylinder or a screw thread. Typically, hydraulic jacks have two cylinders of different sizes that are connected with a pipe. The hydraulic fluid is then forced into these cylinders by a plunger. When the plunger moves forward, oil gets pushed into the cylinder, and when you pull the plunger backward, the hydraulic fluid gets pulled into the pump chamber. The combination of these movements delivers enough pressure to power the hydraulic jack. Read on to learn how a hydraulic jack works and how to use one.

The Process

Generally, when using a hydraulic jack, you insert the metal pumping bar into the equipment socket and then pump it. This raises the boom that lifts the load attached to it. Opening the valve that is usually at the jack’s base will lower the load. The primary power source of hydraulic jacks comes from hydraulic fluid, and pressure is created by the movement of this fluid in two cylinders via a plunger. The two cylinders differ in size, with the large cylinder producing more pressure. However, you will still get the same amount of pressure in both cylinders. The hydraulic fluid or oil will first move into the pump chamber when you move the pump plunger backward. This movement also opens the valve, which facilitates the movement of oil into the chamber. When you move the plunger downward, the oil gets into the cylinder via the discharge valve. Next, the suction valve also closes, thereby creating pressure in the ram. The resulting pressure lifts the piston of the chamber, which then helps you lift a heavy load. Generally, hydraulic jacks function based on the movement of oil from the pump chamber to the cylinders. By continually making these movements, you can lift heavy weights higher and higher. The pump will continuously exert small bits of force on the oil until it creates substantial pressure to push up the jack and lift a load. With just the simple hand pump mechanism, the hydraulic jack will exert massive forces. You also need to ensure that all the hydraulic jack parts are well maintained to keep them properly functioning.

The Working Principle of Hydraulic Jacks

Hydraulic jacks work based on Pascal’s principle. Blaise Pascal, a French scientist, developed this principle over 350 years ago and it has become the backbone of fluid mechanics. As per Pascal’s principle, pressure exerted at any point on liquid in a container gets transmitted to all other parts of the liquid without any loss. This means the pressure at the top of a container and the one at the bottom will be equal.

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Hydraulic jacks make work simpler in various industries, such as lifting vehicles above the ground level. The construction sector is also heavily reliant on hydraulic jacks for easier completion of several tasks. With a simple hand pump mechanism, you can lift heavy loads with ease. Make your work more efficient and simpler by getting hydraulic equipment from Metro Hydraulic Jack Company. We have been the leading company in supplying quality hydraulic lifting systems to clients all over the country since 1941. We have a full line of hydraulic jacks, tools, and add-ons beneficial to several sectors. Our products include: Contact us today or request a quote for the hydraulic items you need from us. Metro Hydraulic Jack Company is your single source for all your hydraulic needs.
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How the Oil and Gas Industry Is Benefitting From Hydraulic Power

The oil and gas industries rely heavily on hydraulic systems due to their ability to handle enormous amounts of power. In both onshore and offshore applications, hydraulic fracturing equipment plays an important role in boosting energy production and lowering costs for consumers. Hydraulic power comes in many forms that are suited to certain high-powered applications.

Critical Applications that Require Hydraulics

Hydraulic systems are effective tools for transmitting power in offshore projects like fracking and oil mining. Oftentimes, offshore hydraulic systems are placed where pipes are prone to leak underwater. Metro Hydraulic Jack Co. sells Enerpac Equipment that can provide proper maintenance. High-powered hydraulic systems enable crews to complete daily processes both offshore and onshore. Some of the equipment that benefits from hydraulic power include:
  • Rock Drills: Hydraulic rock drills exert an immense amount of pressure to blast through bedrock.
  • Filter Presses: Filter presses effectively separate solids and liquids by using high-powered hydraulics to pump a slurry through the filter press.
  • Drilling Rigs: Drilling rigs dig wells and lay pipes in both onshore and offshore projects.
  • Cranes and Pumps: These cranes use hydraulic power to lift much heavier loads than are possible with mechanical and diesel-powered cranes.
  • Blast Hole Drill Rigs: These drill rigs clear bedrock using explosives loaded into a blast hole.
  • Mining Dump Trucks: Mining dump trucks equipped with hydraulic systems are more powerful than traditional dump trucks.
With the help of hydraulic power, your people and equipment can work more effectively and efficiently.

Hydraulic Parts at Work

There are several hydraulic parts that are crucial to the oil and gas industry.


Hydraulic cylinders are versatile. They can use different types of internal fluids—like mineral oil and water glycol—and be mounted in different positions, any of which can exert an enormous amount of force.


Hydraulic pumps outperform mechanical pumps at producing a high volume each day.


Hydraulic valves tolerate a variety of harsh conditions, including high pressure and extreme temperatures. The valves also provide strong, secure sealing protection.


Liquid-filled gauges are long-lasting, high-performance parts even when conditions are not optimal. As a result, these instruments require less maintenance and reduce unexpected downtime.

High-Powered Solutions From Metro Hydraulic Jack Co.

If you’re looking for high-powered solutions for your energy company, Metro Hydraulic Jack Co. can help. We offer a large selection of hydraulic products and components for the oil and gas industry for both land and sea-based operations. Contact us today to get started on your application.

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Advantages and Applications of Stanley Hydraulic Tools

Click to ExpandAdvantages and Applications of Stanley Hydraulic Tools
Hydraulic tools are hand-operated machines with hydraulic drives that are employed for various technological operations, such as tightening threaded joints and pressing parts in and out. They utilize a pressurized fluid—typically hydraulic oil—as the source of power to perform a job, which offers a number of advantages over alternative power solutions. For example: 
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How Hydraulics Transformed the Agriculture Industry

A century ago, a vast majority of the US population lived and worked on farms to raise crops or cattle for personal use and profit. Initially, all agricultural operations were performed manually and required significant manpower. However, the introduction and use of modern agricultural machinery, including hydraulic devices and equipment, allowed farmworkers to complete tasks faster, reducing the number of farmhands required for day-to-day operations. This decreasing demand translated to an increasing number of people migrating from agriculture to other sectors. As it stands today, only about one percent of the US population works in agriculture. Continue reading “How Hydraulics Transformed the Agriculture Industry”
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Why You Need to Be Repacking Your Hydraulic Cylinders

Repacking hydraulic cylinders should be a regular component of any organization’s annual preventative maintenance routine. The process is relatively simple and serves to keep machinery running in peak condition at all times. Most hydraulic cylinders eventually begin to leak oil from their seals. Repacking the cylinders serves to keep costs down and machinery operational. Taking the time to repackage hydraulic cylinders fixes broken links and extends the cylinders’ life span. That translates to benefits for the professionals who rely on them to complete critical work. If teams fail to assess and repackage their hydraulic cylinders regularly, they could lose out on both profitability and efficiency in the workplace. Continue reading “Why You Need to Be Repacking Your Hydraulic Cylinders”
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The Most Common Hydraulic Jack Problems

Hydraulic jacks simplify the movement of large or heavy items. The jack’s hydraulic system multiplies a worker’s efforts, enabling one person to successfully lift and maneuver heavy loads with little physical strain. Jacks are also used to suspend heavy objects in midair to provide maintenance access with minimal exertion on the operator’s part. Though they’re built to be tough, hydraulic jacks can sustain damage from heavy use, improper maintenance, environmental elements, and other factors that compromise their ability to perform. Regular hydraulic jack repair and/or maintenance mitigates the damage caused by these issues by identifying signs of damage early and allowing for fast correction of any problems. This is especially crucial for older jacks that have been operational for many years. Continue reading “The Most Common Hydraulic Jack Problems”
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How Hydraulic Systems Power Waste Management Operations

Many industries rely on the effective use of hydraulic power tools to build, maintain, and repair their structures and appliances. Hydraulic power tools see use in a diverse range of industries, which include:
  • Construction
  • Utilities
  • Transportation
  • Railroads
  • Automotive and aerospace manufacturing
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Using Directional Control Valves

Directional control valves are the workhorses heavily relied upon in the worlds of hydraulic circuits and machinery as well as pneumatic systems because of the way they allow fluids to flow into specific pathways from one or multiple sources. The most basic configuration is a spool inside a cylinder where the movement of the spool is what permits or restricts the flow of fluids through it. An actuating force must be applied to operate the valve and move it from normal (or neutral) position to working position. More complex control valves can have more than two basic positions by have multiple working positions.

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Deciding Between Bottle Jacks and Floor Jacks

For any job, in any industry, choosing the right tools to work with is crucial for ensuring smooth, efficient, and safe operations. In the automotive industry, professional and amateur mechanics alike often struggle with determining whether to use a floor jack or a bottle jack for repairs. One offers stability, ease of use, and high speed, while the other provides optimal power and a compact size.

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Hydraulic and Mechanical Jacks in the Construction Industry

A jack is a versatile tool that uses force to lift heavy loads. Screw threads and hydraulic cylinders are the primary mechanisms with which force is applied; therefore, jacks fall under the categories of mechanical or hydraulic.

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Quality Services Since 1941

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For over 70 years, Metro Hydraulic Jack Company, a third-generation, family-owned and operated business, has been providing industrial hydraulic parts and equipment services to commercial, automotive, marine, refuse, and construction industries.


As a leading U.S. sales and service center, we provide an unmatched customer experience and create long-lasting professional relationships with our clients.


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