Garmin GHP 10 Marine Autopilot System Installation Instructions - Page 23

Connecting the Pump to the ECU Do not connect the pump to the ECU until you have mounted the ECU to the boat following the procedures on page 25. Connecting the Compact 2.1 L Pump to the Hydraulic Lines Before disconnecting any hydraulic lines on your boat, consult the manufacturer of your boat or steering system. You must know how to properly prepare the hoses for removal, and you must know how to properly bleed the hydraulic system of air when you complete the connections. Notice When adding hydraulic hose to the steering system, only use hose with machine-crimped or field-replaceable fittings that have a minimum pressure rating of 1,000 lbf/in2. Port cylinder connector Port helm connector Check valves Helm return-line connector Bypass valve (for hydraulic bleeding) Starboard helm connector Starboard cylinder connector ECU connectors Compact 2.1 L Pump Connectors and Valves Install the compact 2.1 L pump in-line with the hydraulic steering lines of the boat. The compact 2.1 L pump manifold has five hoseconnector fittings, three to the helm (port, starboard, and return), and two to the cylinder (port and starboard). Do not use Teflon tape on any hydraulic fitting. Use an appropriate thread sealant such as Loctite Pro Lock Tight multipurpose anaerobic gel, part number 51604, or equivalent, on all pipe threads in the hydraulic system. Use the built-in bypass valve on the pump manifold when bleeding the hydraulic lines. See page 34 for more information. Note: To avoid possible autopilot performance degradation, ensure that the built-in bypass valve on the pump manifold is fully closed during normal operation.. To connect the pump to the hydraulic lines: 1. Consult the hydraulic layout diagram below to determine the correct place to connect the pump to your hydraulic system. 2. 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 of this, instead of connecting the cylinder-bound hose to the C port and the helm-bound hose to the H port, 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. 3. Prepare to disconnect the hydraulic lines in your boat as specified by the manufacturer of your boat or steering system. GHP 10 Marine Autopilot System Installation Instructions Alternative Hydraulic Installation Using the C (SAE #6) Ports 23