Series 40 Steering Control Unit

Series 40 Steering Control UnitTransporting, loading, hauling, dumping—big tasks require big, powerful vehicles with the steering ability to match. The Series 40 Steering Control Unit (SCU) from Eaton makes getting more responsive, reliable steering in a small, compact package more cost effective than ever before. Featuring integrated valves—both symmetrical and progressive for uniform, efficient steering—a high capacity Eaton Gerotor assembly and two available patented designs (balanced architecture and wide angle), the Series 40 SCU is the go-to solution for both articulated- and fixed-frame vehicles.

Product Features

  • Patented balanced architecture and wide angle designs increase reliability and reduce system costs
  • Optional pilot pressure port can be used for applying pressure to priority valve as well as for diagnostics
  • Symmetrical valving increases balance for precise servo response and uniform steering action, as well as progressive valving to reduce operating costs
  • Thicker sleeve design provides stability, especially under pressure- and thermal-transient conditions.
  • Eaton Q-Amp® technology maximizes steering control
  • High-capacity Gerotor provides ample fluid displacement
  • Integrated valves and load-sensing capabilities and match performance to load requirements
  • Available with open- or closed-center designs

Technical Information

  • Max Back Pressure 21 bar (300 PSI)
  • Max System Operating Temperature 93°C (200° F)
  • Rated Flow 151 l/min (40 GPM)
  • Max Flow 212l/min (56 GPM)
  • Max Differential Between Steering Unit and System Temperature 28°C/50°F
  • Input Torque
    • Powered – 2.8 - 3.4 Nm @ 6.9 bar back pressure (25 - 30 lb-in @ 100 PSI back pressure)
    • Non-Powered Manual steering is not possible without hydraulic power
  • Rotation - None
  • Fluid - ATF Type A and most petroleum based fluids
  • Recommended Filtration - ISO 18/13 cleanliness level


  • Articulated Vehicles
    • Loaders
    • Scrapers
    • Skidders
    • Ag Tractors
  • Fixed Frame Vehicles
  • Large Front End Loaders
  • Graders
  • Mining Trucks
  • Articulated Dump Haulers
  • Transporters


Featured Literature

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Eaton Steering Solutions for Mobile Off-Highway
An overview of Eaton’s complete line of steering control solutions for mobile off-highway applications.


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XCEL 45 Steering Unit Catalog
Various system options for the XCEL 45 Steering Unit offer you incredible design flexibility. Publication: E-STCU-CC002-E

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Eaton’s Hydraulic Steering Units - Full line catalog
Publication C-STOV-MC001-E2

Articles & White Papers

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Advancements in Lift Truck Steering
Check out this reprint from Lift Access Magazine that asks the question, "Is variable rate steering the next big thing?" By Kevin Thayer, Eaton




Additional Information

Steering Sizing Calculator – Enter your information on this online steering sizing calculator tool. Calculations given are guidelines only and need to be verified by the manufacturer.

Configure Product

Find the exact product configuration that meets your needs with the Eaton product configurator. The configurator is easy to use and helps you create a product that meets your specifications from end-to-end.


Contact Me

Please use the form below to submit your request, questions or comments. We look forward to hearing from you and an Eaton representative will contact you shortly.

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NOTE: Due to a backlog in our technical support department and our continuous effort to improve our customers’ experience, please refer to your nearest distributor with any technical questions. You can locate the nearest Eaton Hydraulics distributor by clicking on the link above. Thank you for your understanding.

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