Raymarine M81120 Installation Manual page 13

12
Three line systems
In a three line system, the hydraulic fluid flows in only one direction:
• out of the helm pump to the ram
• returning from the other side of the ram to the reservoir via a
The system will include a check valve block to direct all returned
fluid from the ram back to the reservoir.
Connect the autopilot pump to the steering system as shown in
Figure 7.
Figure 7: Autopilot pump location for three line systems
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common return line
Helm
pump
Check valve
Reservoir
pipe
Autopilot
pump
Hydraulic Pump - Installation Guide
Ram pipes
Steering ram