Knowledge Base

Find fast answers to your What is it? and How does it work? questions with the H&R Construction Equipment Parts knowledge base series, designed to speak informatively and passionately about topics in the heavy equipment industry. From 10-year-old excavator enthusiasts to passionate parts tinkerers looking to learn more, the aim of the series is to provide basic information to any and all inquisitive minds.


  1. What Are Track Springs with Track Spring Diagram

    Track spring assemblies in warehouse.

    Consider the noble track spring assembly on your tracked equipment -- keeping tension while simultaneously protecting other parts from impacts. Learn how this part accomplishes its work, look inside, and watch it in animated action as part of our Knowledge Base series.

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  2. Interactive Excavator Parts Diagram: Search and Learn About Excavators

    A header shows the outline of an excavator.

    Explore all the parts on an excavator, see how excavator parts work on the machine and together, and examine how an excavator works with this searchable excavator parts diagram.

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  3. What Is a Slewing Ring with Slewing Ring Diagram

    A slewing ring bearing in the H&R warehouse.

    Ever wonder what a slewing ring is and how it works? Explore slewing rings, see inside of a slewing ring, and learn more about this important part in another edition of our Knowledge Base series.

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  4. What is a Swing Drive with Swing Drive Diagram

    An image of swing drives.

    At the heart of an excavator is a swing drive -- spinning the house and attachments, endlessly and in a perfect, smooth circle. If you've ever wondered just exactly how a swing drive gets its job done, read on and learn about this interesting excavator part today.

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  5. Wheeled Excavators vs Tracked Excavators: Pros and Cons.

    A graphic reads Tracked Excavator vs Wheeled Excavator

    Whether you're searching for a new a excavator, you're looking to rent one, or you're just weighing your excavator options, one question that has probably come up is: Should I go with tracks or wheels? If that's the case, we've put together this short guide and infographic to help in your decision.

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  6. What is a Hydraulic Cylinder with Hydraulic Cylinder Diagram

    A tower of hydraulic cylinders.

    If you work on heavy construction equipment, you know all about cylinders, but if you're inquisitive, want a refresher, or just like videos and images, our cylinder explainer is the article for you.

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  7. What is a Final Drive with Final Drive Diagram

    A long row of aftermarket final drives is ready for shipping.

    You might already know every part on your machine — maybe even taken most of them apart and put them back together a few times — but if you've ever wanted to know more about a final drive and how it works, this article is for you.

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  8. What is a Transfer Case with Transfer Case Diagram

    A mechanic works on a transfer case.

    Construction parts expert or just curious about the parts on the machines that build our bridges, dig our basements, and generally do all the big jobs? Read on and learn exactly what a transfer case is, what it does, and why it's so important.

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