Garmin GHP 10 Installation Instructions Manual page 15

Alternative Compact 2.1 L Pump Hydraulic Configurations
Depending on the hydraulic layout of your boat, alternative hydraulic installations using the compact 2.1L pump are possible:
• The C1 and H1 ports are directly connected to each other internally, and the C2 port is directly connected to H2. Because these
ports are connected internally, you can leave the plugs in the C ports and use tee fittings to connect both the helm and cylinder
hoses to the H ports. Though you should use all four ports for an ideal installation, this type of installation will steer the boat
correctly.
• If you plan to use this alternative compact 2.1L pump installation on a larger boat with long spans of hydraulic hose, the fitting
size you choose is important. The fittings on the C ports are SAE #6, while the fittings on the H ports are SAE #4. Therefore, for
alternative installations on larger boats, it is best to move the plugs from the C ports to the H ports and use tee fittings to connect
both the helm and cylinder hoses to the larger C ports as illustrated below.
GHP 10 Marine Autopilot System Installation Instructions
Alternative Hydraulic Installation using the C (SAE #6) Ports
H ports
C ports
Compact .1 L
pump
(and motor)
1