How Do Hydraulics Work?


how do hydraulics workOne of the great things that we all share in the human experience is that we are constantly working to improve our situations.  Even in the deepest reaches of history it can be shown that humans are constantly working on new solutions to our problems.  From the invention of the wheel to aqueducts for irrigation, to simple machines, many inventions have help increase our productivity and allow us to do more work.  Our increased ability to do work quickly and efficiently has led to great strides in industry and culture around the world.

One of these great advances was the use of hydraulic force to help do work.  Hydraulic force is simply using a compressed fluid, usually a light oil, to exert force on a mechanical linkage.  There are a lot of advantages to using hydraulic force to do work.  First, since it is a liquid, any hydraulic fluid is very easy to transport and store making hydraulic equipment relatively compact and simple.  Also, hydraulic fluids can be pressurized to extremely high pressures allow them to be used to move very heavy loads and do a significant amount of work.  Lastly, hydraulics have very few moving parts so they can last for a long time even in very harsh operating environments.

Hydraulics rely on the simple principle that fluids are incompressible.  That means no matter how much pressure you put on them, the fluid used in hydraulics will not compress and will occupy a fixed volume.  This is an advantage because as your system carries extremely heavy loads and produces huge forces you don’t have to worry about failures or shifting of your equipment.  Every hydraulic system includes a pump or device to pressurize the working fluid and hoses or conduits to transfer the fluid from the pump to the operational side of the equipment.  Then, a cinder or hydraulic motor is used to turn the pressure of the working fluid into movement, and therefore work.

The main danger in a hydraulic system is a fluid leak.  Since the system relies on the incompressibility of the working fluid, a leak in the system can cause serious problems.  As fluid leaks out of the system, the pressure will be reduced allowing movement you do not expect in your hydraulics.  Depending on your equipment and how it is used, this unexpected movement can cause serious problems with the operation of your equipment and even danger for the operators and those around it.

Since your hydraulic equipment is designed to work under very high pressures, leaks are not uncommon.  Everywhere there is movement in your hydraulic system there must be a seal to keep the hydraulic fluid inside the system.  These seals are placed around pump and motor shafts, as well as around hydraulic cylinders to retain the pressure of the hydraulic fluid and keep the system from leaking.  Over time, these seals can become worn from use or shrink and become brittle from a lack of use.  Both of these situations can create leaks in your hydraulic system.

Replacing these seals can be an extremely tedious job and create downtime for your equipment costing you money in repairs and lost time.  Fortunately, there is a better alternative to sealing your leaks and repair your hydraulic seals.  BlueDevil Hydraulic Stop Leak has the ability to recondition and repair the seals in your hydraulic system from the Inside out.  Simply add BlueDevil Hydraulic Stop leak to your hydraulic fluid reservoirs and run the system as usual to seal your leaks!  BlueDevil Hydraulic Stop leak is an inexpensive solution to sealing your hydraulic leaks quickly and easily.

BlueDevil Hydraulic Stop Leak

You can purchase BlueDevil Hydraulic Stop Leak at any of our partnering local auto parts stores like:

  • AutoZone
  • Advance Auto Parts
  • Bennett Auto Supply
  • CarQuest Auto parts
  • NAPA Auto Parts
  • O’Reilly Auto Parts
  • Pep Boys
  • Fast Track
  • Bumper to Bumper Auto Parts Specialists
  • S&E Quick Lube Distributer
  • DYK Automotive

You can also purchase BlueDevil Hydraulic Stop Leak directly from BlueDevil here: Hydraulic Stop Leak


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hydraulic_system.jpg – By Liebeslakritze – Licensed by Creative Commons Share Alike 3.0 Via Flikr – Original Link

2 responses to "How Do Hydraulics Work?"


  1. Brian on March 24, 2017 at 9:13 pm

    2 questions
    1) I have a one to with a dump that oil shoots out cylinder when I raise the bed can this product fix that
    2) I have a bucket truck that has four out riggers , one of the legs has a leak it uses hyien glacial blu hydraulic fluid product code 1043632 can your product be used with that type of fluid and if so how much would I mix to in with it
    Thank you

    • BlueDevil Pro on March 27, 2017 at 10:18 am


      The BlueDevil Hydraulic Stop Leak is only intended for the rubber seals/gaskets in the system. The product is safe and compatible to use with the fluid you have described, and you will be using about one oz. of the product per quart of fluid in the system. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!


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