Raymarine M81120 Installation Manual page 11

10
Hydraulic steering systems
There are three basic types of hydraulic steering systems:
• two line systems
• two line pressurized systems
• three line systems
On the following pages we describe typical connection points for the
autopilot pump on each of these systems. For all of the systems you
will need to connect a third hydraulic pipe (as shown) between the
autopilot pump and the helm pump or system reservoir.
Two line systems
Figure 5 shows a typical two line steering system. Hydraulic fluid
flows into the ram in either direction, depending on the direction the
helm pump rotates. Connect the autopilot pump to the steering
system as shown in Figure 5.
Figure 5: Autopilot pump location for two line systems
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Helm
pump
Check valve (if required)
Reservoir pipe
Autopilot
pump
Hydraulic Pump - Installation Guide
Ram pipes
Steering ram