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9GHP 10 Marine Autopilot System Installation Instructions
Hydraulic Considerations – 2.0 L and 1.2 L Pumps
Different boats have different hydraulic considerations you must examine before mounting the pump or disconnecting any hoses.
Before starting the hydraulic installation, verify the type of hydraulic steering in your boat, and where to install the appropriate type of
If the hydraulic steering of your boat does not match the hydraulic layouts in this manual, contact Garmin Product Support.
2.0 L or 1.2 L Pump Hydraulic Layout on Single-Helm Boats (without Power Assist)
2.0 L/1.2 L pump (and motor):
An unbalanced cylinder requires an
unbalanced valve on the pump (page 21)
Mount the pump horizontally if possible. Do
not mount the pump vertically with the pump
end (hydraulic connections) down.
Mount the Shadow Drive horizontally and as
level as possible.
Install the Shadow Drive in either the port or
the starboard hydraulic steering line.
Always install a length of hose between the
helm and the Shadow Drive.
Do not install the Shadow Drive directly to
Install the Shadow Drive between the pump
and the helm.
Do not install the Shadow Drive between
the pump and the cylinder.
2.0 L/1.2 L pump
Do not turn the system on until you bleed all the air from the helm, the Shadow Drive, the pump, and all the hydraulic lines.
See page 34.