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Hydraulic Steering Systems

Description of LS Hydraulic Steering Systems

As a general rule, the basic set up of a steering system includes:

  • 1 Cylinder,
  • 1 Manual pump,
  • Tubing to connect the cylinder to the manual pump.

Other elements will be added to this basic set up in function of the number of steering stations or rudders to be operated, and of the installation of a power unit for automatic or non automatic pilot.

Inboard cylinderInboard cylinder


The cylinder is the dictating element towards the selection of a system as it gives the power to the steering system. To select a cylinder, follow the instructions in menu “Selection of the steering system for pleasure boats” or in menu “Selection of the steering system for work boats

Inboard pumpInboard pump

Manual pump

The manual pump is an axial piston pump which makes it possible to suck and force back the oil contained in the circuit when the wheel is turned. Its cubic capacity determines the number of turns required for a lock to lock manoeuvre. The pump is fitted with a lock valve which prevents rudder or motor movement when the helm is not operated. Some models are fitted with pressure relief valves which protect the circuit against abnormal pressure increase.

Flexible tube


Only tubing designed for hydraulic transfer is to be used. The tube diameter is calculated in function of the pump cubic capacity. Maximum efficiency is achieved with inflexible tubing, however flexible tubing may be used for torque levels not exceeding 100 kpm.