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Hydraulic Symbols 101, Understanding Fluid Power Schematics

If you want to know how fluid power works, you’ll need to be able to learn how to read schematics. It’s a skill that is vital to being able to repair hydraulic units like pumps and motors, and also more complex units like final drives.

It can be hard, but, as Josh Cosford says, “it’s not impossible to learn. In fact, it only takes a basic level understanding of how symbols work and how they’re arranged in a diagram. One challenge – even if you’ve memorized every symbol in the library – is understanding why a particular symbol is used in a circuit; that part is hard to teach and just comes with experience.”

In this article from Fluid Power World, Cosford provides an overview of some common symbols used in hydraulic schematics, including:

  • Basic Line
  • Enclosure Line
  • Pilot/Drain Line
  • Old Drain Line
  • Crossing Lines
  • Connected Lines
  • Hydraulic Pump
  • Hydraulic Motor
  • Relief Valve
  • Reducing Valve

Cosford recommends young engineers and repair specialists spend time learning how “hydraulic symbols are combined to create a complete schematic representing an actual machine” and how to “interpret the symbols.”

Injection Molding Machine, Hydraulic Repair

Large manufacturing systems like this injection molding machine have complex fluid power schematics that use basic hydraulic symbols.

Experts in Hydraulic Repair Services and Solutions

Our team is full of experts that understand the complexities of hydraulic systems and the symbols that you find on the schematics. If you need someone that can help you fix any piece of your hydraulic system, conduct testing, or help you develop a maintenance plan, we have you covered. We are an independent hydraulic repair shop and our veteran team has the hands-on know-how and access to the state-of-the-art technology to help you out. We have repaired, rebuilt, and remanufactured hydraulic units for customers all over the world and we are proud of our track record and the relationships we have built with our customers and companies like Bosch Rexroth, Linde, and Oilgear.

On-Site Hydraulic Repair, Field Service, and Consultation Near You

We can send our field technicians to your location for on-site inspection and repair. If your operation has stopped, we can help get your pump back up and running as soon as possible. Our reliable, experienced team can perform diagnostic services and minor repairs for equipment and machinery used in many industries. Our team can travel throughout the United States and we have even traveled to international locations.

Same Day Hydraulic Repair

If repairs cannot be made on-site, then ship it to our facility. If you’re close enough, you can drop it off. If you get it to us by 10:00 AM, and we have the same model in stock, we’ll repair it and have it ready to ship by 5:00 PM the same day.

Our Guarantee to You and Commitment to Quality

When you send us your unit, we guarantee:

  • We will only use genuine OEM replacement parts.
  • If you ship it to us, we will thoroughly test your unit on our test stands.
  • We will only ship it back to you if it meets or exceeds OEM specifications.