NAUTECH 3.1/M-90 hydraulic steering kit for outboard motors up to 300 hp. Includes a set of 9-meter hoses, with preassembled fittings at one end. Also includes separate fittings that are easy to mount on the other end. Turns the wheel 5.1 revolutions throughout the cylinder's action.

Includes:
- 1 x UP25F hydraulic pump, displacement 25 cm3, max pressure 70 bar
- 1 x UC128-OBF/1 hydraulic cylinder, volume 128 cm³, stroke 185 mm
- 2 x 9 m KIT OB/M-90 Ø 5/16” I.D. hydraulic hoses - 2 x 5/16” I.D. hose fittings - 2 l hydraulic oil

Useful information about hydraulic steering systems:

Hydraulic steering systems consist of a hydraulic pump and cylinder. These connect to each other with hoses or tubes. Turning the wheel pressurizes the hydraulic pump, which forces oil to flow through the hoses/tubes into the cylinder and from the cylinder back into the pump. The cylinder movement is relayed to the rudder or stern drive. The pumps have a non-return valve that prevents the back-flow of oil. This enables the use of several wheel control instruments. The cylinders used may be balanced or unbalanced. With balanced cylinders, the same number of wheel revolutions moves the rudder from the center position to either direction. Unbalanced cylinders have two chambers with different sizes. This means that the required wheel revolutions per direction differ for the same movement.

ULTRAFLEX manufactures different pumps with different capacities (oil volume in cm3 per one wheel revolution) for different applications. The cylinder oil volume must be taken into account when choosing the pump. The number of wheel revolutions in the starboard and port directions depends on the cylinder volume and pump capacity. For example: If the pump capacity is 20 cm3 and the cylinder volume is 94 cm3, the formula is as follows: 94 divided by 20 equals 4.7. This means that 4.7 revolutions of the wheel are required to move the rudder from one extreme to the other. If two cylinders are connected in parallel, the cylinder volume must be multiplied by two. Applications in which the number of wheel revolutions is lower than four are not recommended, because the steering forces grow too large. Similarly, applications in which the number of wheel revolutions is greater than eight are not recommended, as the steering would react too slowly. The maximum operating pressure is 7.0 MPa (70 bar) (1,000 psi).

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