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Introduction

20220422N 5

1 INTRODUCTION

Note ! This manual does not cover a previous model RPU80 with serial

numbers 101-248. The model is covered by the RPU100

Reversible Pump Manual. Minor modifications where made to

the RPU100 model and they are described in a separate

"Technical Information" no. 01/94.

1.1 General

Hydraulic steering systems are now being used in every

category of small vessel. In many respects hydraulic steering is

preferable to mechanical steering.

Hydraulic systems normally comprise of two main components,

a steering wheel pump and steering cylinder(s). The steering

wheel pump may be either a gear pump or a plunger pump.

Which ever type is installed, steering is achieved by turning the

steering wheel in either direction causing oil from the wheel

pump to be supplied to the appropriate side of the cylinder. Oil

is returned via the opposite side of the cylinder back to the

pump.

The linear motion of the cylinder rod is transformed to a rotary

motion by the tiller, which turns the rudder shaft and rudder.

Check valves (non-return valves) are usually incorporated to

prevent the rudder driving the steering wheel pump.

If an autopilot is to be included in such a hydraulic steering

system, then the oil flow providing the rudder movement must

be controlled by electrical signals from the autopilot.

The maximum flow rate of RPU80, RPU160 and RPU300 is 0,8

l/min., 1,6 l/min. and 3,0 l/min. respectively, measured at a

pressure of 10 bar with nominal voltage (12 VDC) on the motor

terminals.

Note ! RPU300 measurements are based on charging voltage

(14,4VDC)

The flow rate is controlled by the output voltage from the

autopilot's junction unit/computer. When connected to autopilots

using the J300, J3000, all "X"-models of junction units and

ACXX Autopilot Computers, the output voltage that controls the

motor speed is proportional to the heading error from the

autopilot.

This will give slow and smooth rudder movements when

steering on a straight course in calm weather, but will also

ensure fast rudder response for bigger course changes or course

deviations caused by rough sea conditions.

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