Connecting the pump to the ecu – Garmin GHP 10 User Manual
Page 23
GHP 10 Marine Autopilot System Installation Instructions
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
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/in
2
.
Compact 2.1 L Pump Connectors and Valves
Port helm connector
Port cylinder
connector
Starboard cylinder
connector
Starboard helm
connector
ECU connectors
Helm return-line
connector
Bypass valve (for
hydraulic bleeding)
Check 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 hose-
connector 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
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.
•
•
Alternative Hydraulic
Installation using the
C (SAE #6) Ports
Alternative Hydraulic
Installation using the
C (SAE #6) Ports