Hydraulics BG

Exploring the 3 Steering Units: What Types Are There?

Steering units

Hydraulic Steering Units: Definition, Features and Products:

Can you think of driving or steering a large and heavy-weight vehicle only by the use of sheer muscle power? Do you think that cars would be of any convenience if we had to push it with all our strength every time we had to go somewhere? The answer would be no and here is where steering units, specifically hydraulic steering units come into the picture. There are mostly three types of steering units, namely, the hydraulic power steering (HPS), the electric power hydraulic steering (EPHS), and the fully electric power steering (EPS). 

There are different types of steering units, out of which hydraulic steering units are one of the most popular options. Without steering units hydraulic or electric power steering units, it would be quite impossible for us to steer or drive heavy-weight vehicles. What steering units do is, they use hydraulic force to travel from the steering wheel to the steering axle linkage. Thus, steering units hydraulic multiplies the force applied on the steering wheel and makes it possible for us to manoeuvre large vehicles using simple steering mechanisms. Steering units hydraulic come with various features that makes steering possible, for example directional control units. If you wish to know more about directional control units, you can refer to our detailed article on hydraulic valves. There you will find more information on directional control units.

Parts or Features of Steering Units or Hydraulic Steering Units:

Hydraulic Power Steering System (HPS):

This is one of the major components of the steering control units. Hydraulic power steering units are that part of steering mechanisms that convert the linear force applied on the steering wheel and convert it into rotational force which helps us drive heavy vehicles. 

There are different components in the control systems for steering. HPS makes it possible for us to steer vehicles properly and has various parts which make it possible, namely, hydraulic fluid, steering fluid reservoir, steering pump, rotary valve and hydraulic chamber. 

  • Hydraulic Fluid: Hydraulic fluid is the medium through which the energy transfer happens within the control systems for steering. In short, it is the fuel used for the functioning of steering mechanisms. Most hydraulic fluids used in steering units are mineral oils or silicon-based oils. It is very important to use the right kind of hydraulic fluid for the type of steering units that are going to be used as using the wrong kind of hydraulic fluid can seriously damage the steering units.
  • Steering Fluid Reservoir: This part is responsible for storing hydraulic fluid and supplying it to the steering pump.
  • Steering Pump: Steering pumps are some of the most important parts of steering control units. They are responsible for pumping hydraulic fluid from the reservoirs and help the steering units function.
  • Rotary Valve: Rotary valves within steering control units are responsible for redirecting hydraulic fluid back into the steering pump or steering rack.
  • Hydraulic Chamber: It is an extra space of storage for hydraulic fluid.

Steering Wheel:

A steering wheel acts as the primary phase of interaction between the driver and steering units. It helps us drive and steer the vehicle as it acts as a major part of the directional control units.

Lena Agromashini Ltd.:

The ultimate place to find the best quality steering units, power steering units or  electric power steering units would be none other than Lena Agromashini Ltd. as the ultimate Hydraulic Motors Manufacturers. They offer some of the best steering apparatus or steering units for sale in town. They are an official representative of reputable Bulgarian hydraulics power producers such as Badestnost, M+S Hydraulic, Caproni, and many others with premium quality standards. Lena Agromashini Ltd. has two state-of-the-art warehouses to cater to the overwhelming demand for its products. One of the warehouses, Sliven in Bulgaria, is spread across 13,300 square miles. The other warehouse is located in Warsaw near Bulmach Ltd., the subsidiary of Lena Agromashini Ltd., and this is a massive advantage for Lena Agromashini Ltd., since they can stay and work closer to their partners while offering impeccable service through their wide range of products in the UK and the USA as well.


Hydrostatic Steering units – HSFA

Reliable steering of the machine, good ergonomics, smoother and softer rotation of the wheel, providing an easy emergency control of the machine, energy saving effect, and compactness of the control systems for steering.

Hydrostatic Steering units HKU…/3,4,7

Integrated radial distribution incorporates two rotary tracing valves in the housing, which turn on the metering pump.

Hydrostatic Steering units HKU…/4PB

A standard steering unit designed with an auxiliary port for flow

Hydrostatic Steering units HKU(S)…/5(D)(T)(E)

Low steering wheel torque 0,5÷2,0 Nm [4.5÷18 lb-in] at average operating conditions. High steering speed, limited by the operating flow and the pressure of the supplying pump.

Hydrostatic Steering units HKUL…/5DT

HKUL is a perfect fit for large vehicles. It is a load steering unit developed explicitly for large displacement to minimise flow loss.

Hydrostatic Steering units HKUM…/4(PB)

M+S Hydraulic has its own range of hydrostatic steering units with mini steering units, perfect for lawn and garden machines, mini tractors and municipal vehicles. These hydrostatic steering units function as standard steering units with auxiliary ports designed for flow.

Hydrostatic Steering units HKUM…/5DT

The steering unit has a load-sensing +
-3dynamic signal and integrated valve functions. The flow to the LS-line allows a comfortable controlling experience while steering.

Hydrostatic Steering units HKUQ…/4

This is a new series of hydrostatic steering units with increased flow. The hydrostatic steering unit, HKUQ…/4, is available for steering medium- and large-sized vehicles. Also, makes it easy to use in servo-amplified mode or emergency operation

Hydrostatic Steering units HKUS…/3,4,8

The HKUS Hydrostatic Steering unit is based on the HKU unit and has unique built-in relief and check valves. M+S Hydraulic makes a compact steering unit, thus reducing the need for additional hydraulic components.

Hydrostatic Steering units HKUSD…/…/4

This is the latest design of a steering unit with two gerotor sets. They are mechanically connected. A switch valve has been built between the two gerotor sets with added switches between two displacements.


This M+S Hydraulic UVM Torque Amplifier range amplifies the torque applied to the control shaft. Applicable in various agricultural and woodworking machines, road rollers, road cleaning machines, forklift trucks, and construction machinery.


The M+S Hydraulic Hydrostatic Steering units are used in low-speed vehicles whose driving speed does not exceed 60 km/h – such as building machines, forklift trucks, harvesting machines, off-highway equipment, etc. These hydraulic units amplify the torque to the steering wheels, with no need for rigid mechanical connection.


The M+S Hydraulic KK Steering Columns transfer the torque from the vehicle’s steering wheel to the HKU, HKUS, or other steering units of the same class. The KK steering columns contain a pipe in which the control shaft is centred.
Max. torque applied to the steering wheel 24 daNm [2124 lb-in ] Max. Bending moment 20 daNm [1770 lb-in] Max. Axial load 100 daN [225 lbs] The steering column must be additionally supported when the length L exceeds 150 mm [5.91 in].


When this mechanism is connected, the steering unit and the priority valve create a perfectly elegant hydraulic tracing system which operates the flow in both the main pipelines of the hydraulic system at any point of time during its operation.

Steering Columns and valves – BKH

The M+S Hydraulic BKH valves have been manufactured to secure the components of the hydraulic circuit. For example, pumps, steering units, as well as cylinders from overloads, impacts, and cavitation. Its advantages include:

  • Easy integration into any hydraulic circuit.
  • Easy mounting to the steering unit.
  • Quick and easy hose connections.

Concluding Remarks:

In this article we have briefly discussed the definition of steering units and the various types of hydraulic steering units, such as a steering units hydraulic and steering apparatus. Hopefully, by now you have a clearer picture of this topic compared to when you started reading this article. We have also discussed a reputable company, Lena Agromashini Ltd. They are one of the best manufacturers of steering units, power steering units or electric power steering units, that specialises in steering apparatus, including a short list of some of the best-selling types of steering units and their features. You can order your choice of steering units from them easily through their website. However, if you still have more queries related to steering units or if you wish to get further details about their company or products, like power steering units, you can always get in touch with Lena Agromashini Ltd. and they can help you out with your problems.

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