Electro-Hydraulic Steering Unit | EHSU

Fully integrated power-on-demand hydraulic steering assist pump with built-in intelligence.

Hydraulic power steering pumps

Electric hydraulic steering pump for mobile vehicle systems

The Hydrapulse® EHSU is a ruggedized electric hydraulic steering pump (electro-hydraulic) unit with integrated motor, controller, and closed-loop feedback that is specifically designed for mobile steering assist and e-steering applications. The EHSU is available in both high and low voltage models and a variety of pump displacements and power levels.  Go to our Resource Center for more information including datasheets, CAD, and Manuals.




  • Power On Demand

    Utilizing PM magnet technology for instant response and true power-on-demand efficiency.

  • Full Integration

    Our fully integrated motor, controller, software, and cooling system reduces cost and complexity while provide for a more compact overall size.

  • Ruggedized

    Built from the ground up for the rugged mobile market. We test to SAE J1455 automotive standards to ensure reliability and durability.

Temp Range

-40° to +85°C


IP 6k9k

Supply Voltage

9-36v DC 

Supply Current

700 mA  (@ 12v) 

Power Input

24v to 48v DC
200v to 800v DC

• Medium and heavy-duty trucks

• Electric, Hybrid, or standard bus

• Trailer steering

• Tag Axle steering

• Off-Highway vehicles

• Hybrid and Electric vehicles

• Autonomous agricultural vehicles


ehsu hydraulic pump without reservoir for mobile and heavy duty vehicles
Electro-hydraulic steering pump with reservoir for high voltage electric and hybrid vehicles


2.5 kW Steering pump / 4 Amp High Voltage with HVIL


2.5 kW Steering pump with integrated reservoir

high voltage steering pump
compact steering hydraulic pump


150 Amp Low Voltage (24v/48v) Sealed Connector


70 Amp High Voltage Connector with HVIL

Types of electric hydraulic steering pumps

Steering Assist
(Without Reservoir)

ehsu hydraulic steering pump schematic

Steering Assist
(With Reservoir)

Uni directional steering pump graphic

E-Steering (Steer-by-wire)

E steering hydraulic pump for hybrid vehicles graphic

How to Order

Developing a hybrid or electric vehicle?

Then contact our team to learn how we can help.  Reach out today.

Need to understand the difference between steer-by-wire, drive-by-wire, steering assist, or E-steering?  
Here are some good references for bedside reading tonight:  Wiki Clemson VEL / OEMOH

Don't forget about Marine!

The Hydrapulse EHSU electro-hydraulic steering pumps are perfect for Marine vessel steering solutions.  With anodized aluminum construction and complete watertight protection, there has never been a better solution for your next steering system.

Thought of the day: Electric Hydraulic Steering Pump – Steering pumps have gradually moved from pure hydraulic to electric-over-hydraulic over the last several decades.  In fact, on most passenger cars and trucks, the steering is now purely electro-mechanical, meaning there is no hydraulics at all.  But when it comes to medium- and heavy-duty trucks and off-highway vehicles, hydraulic steering is here for quite some time.  But we can help make these systems simpler, more efficient, and more powerful with our electric hydraulic steering pump known as the Hydrapulse EHSU.  See more on how we apply this technology to the truck and freight market here.   

Terminology:  This technology can be called several different things but some of the common terms are:  electric hydraulic steering pump, electro-hydraulic steering pump, EHS, EHSP, electrohydraulic steering pump, hydraulic steering assist pump, e-steering pump, steer-by-wire pump, and many more.