ComNav Marine 1420 Autopilot System
Rudder Drive
The next step is to install the Rudder Drive.
• If the system you purchased includes a Reversing-Motor Hydraulic Pump, follow
the instructions in this section.
• If your system came with a Cable Drive, follow the Installation Instructions that
came with that.
• If your system did not come with a Drive System, you will have to adapt the
Autopilot’s Drive outputs to your vessel’s existing Steering System.
ComNav Reversing-Motor Hydraulic Pump
(PNs 20810016, 20810018, 20810031, 20810035)
The reversing pump consists of a hydraulic pump and a motor. The pump is a piston
type, driven by the reversing permanent magnet motor. The pump is designed in such
a way that it will keep oil from returning through the pump when is not running or
correcting. There is also a bleed-to tank to allow the use of unbalanced cylinders. The
pump is compatible with all hydraulic steering systems, including pressurized steering
systems such as Hynautic.
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SPILL VALVE
ADJUSTMEN
To adjust the pump’s flow rate, loosen pump housing screws and turn pump housing.
Clockwise will decrease flow rate, anti-clockwise increases flow rate.
Document PN 29010012 V1.3
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