Instruction Manual
20220422N 3
Contents
1 INTRODUCTION..................................................................................................5
1.1 General............................................................................................................5
1.2 Hydraulic steering gear suitable for the RPU80/RPU160/RPU300 ...............7
2 MEASUREMENTS AND CALCULATIONS FOR APPLYING THE RPU.12
2.1 Calculation of cylinder volume ....................................................................12
2.2 Minimum rudder time adjustment ................................................................12
3 DESCRIPTION OF RPU80/RPU160/RPU300 .................................................14
3.1 Construction..................................................................................................14
3.2 Principle of operation (ref. figure 3-1 and figure 9-1)..................................15
3.3 Valve block...................................................................................................16
3.4 Gear pump ....................................................................................................16
3.5 Pressure operated non-return (check) valves on outlet A and B ..................16
3.6 Suction valves on outlet C ............................................................................16
3.7 Slide (10) ......................................................................................................16
3.8 Pipe connections ...........................................................................................17
4 INSTALLATION .................................................................................................18
4.1 Mechanical Installation.................................................................................18
4.2 Electrical installation ....................................................................................22
5 PREPARATION AND TESTING ......................................................................23
5.1 Oil filling and bleeding.................................................................................23
5.2 Testing ..........................................................................................................23
6 MAINTENANCE .................................................................................................24
6.1 Dismantling ..................................................................................................24
6.2 Electric motor ...............................................................................................24
6.3 Valve block...................................................................................................24
7 FAULT TRACING ..............................................................................................25
7.1 Pump (motor) is not running/not responding to rudder command ...............25
7.2 The piston rod does not move with rudder commands.................................25
7.3 Excessive noise from the pump unit.............................................................25
7.4 The rudder does not stay in off-midship position, but drifts towards midship
due to water pressure on the rudder .......................................................................26
7.5 Steering wheel is turning while pump unit is operated ................................26
7.6 The piston rod of the rudder cylinder does not move smoothly...................26
7.7 Rudder movement stops as water pressure on the rudder increases.............27
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