Garmin GHP 20 Marine Autopilot System for Steer-by-Wire, Installation Instructions Manual

Page: 14 / 257

If the cable is not long enough, it can be extended by splicing
a larger wire ( page 14 ).
Observe the cautions at the beginning of this section about
extending the power cable.
3
Connect the black wire (-) to the negative (-) terminal of the
battery.
4
Connect the red wire (+) to the positive (+) terminal of the
battery.
5
Leave the power cable disconnected from the pump at this
time.
You should connect the power cable to the pump only after
you install all of the other autopilot components to avoid
unwanted activity from the pump.
Power Cable Extensions
If necessary, the power cable can be extended using the
appropriate wire gauge for the length of the extension.
Item Description
À
Fuse
Á
Battery
Â
9 ft. (2.7 m) no extension
Item Description
À
Splice
Á
10 AWG (5.26 mm²) extension wire
Â
Fuse
Ã
8 in. (20.3 cm)
Ä
Battery
Å
8 in. (20.3 cm)
Æ
Up to 15 ft. (4.6 m)
Item Description
À
Splice
Á
8 AWG (8.36 mm²) extension wire
Â
Fuse
Ã
8 in. (20.3 cm)
Ä
Battery
Å
8 in. (20.3 cm)
Æ
Up to 23 ft. (7 m)
Item Description
À
Splice
Á
6 AWG ( 13.29 mm²) extension wire
Â
Fuse
Ã
8 in. (20.3 cm)
Ä
Battery
Item Description
Å
8 in. (20.3 cm)
Æ
Up to 36 ft. (11 m)
Bleeding the Hydraulics
NOTICE
The following is a general procedure for bleeding a hydraulic
steering system. Refer to the instructions provided by the
manufacturer of the steering system for more-specific
information about bleeding the system.
Before you bleed the hydraulic system, ensure that all hose
connections are complete and fully tightened.
1 Select an option:
• If the helm reservoir contains insufficient fluid, fill it with
the appropriate amount of hydraulic fluid.
• If the helm reservoir contains excess fluid, remove the
excess to avoid fluid overflow during the bleeding
process.
2
Manually steer the helm to both cylinder stops.
3
Manually steer the helm fully to port.
4
Open a bypass valve at the cylinder fitting.
5 Turn the helm slowly to port over three minutes.
6 Close the cylinder bypass valve.
7
If necessary, add fluid to the helm reservoir.
8
Repeat steps 2 through 7 until the helm reservoir remains
full.
9
Open the bypass valve on the pump manifold.
10 Turn on the autopilot system and disable the Shadow Drive.
Refer to the owner's manual provided with the autopilot
system for more information on disabling the Shadow Drive.
11 Hold on the helm control for 10 seconds and watch for
steering movement.
12
Select an option:
• If there is steering movement, proceed to step 13.
• If there is no movement, hold
until steering movement
occurs.
13 Hold the soft key that produces steering movement, and
steer fully to the stop.
14
Steer the helm to the opposite stop using the helm control.
15
Close the bypass valve on the pump manifold.
The hydraulic bleeding is now complete.
After hydraulic bleeding is complete, re-enable the Shadow
Drive.
Corrosion Blocker
NOTICE
To ensure long life of all parts, apply corrosion blocker to the
pump at least twice yearly.
A marine-rated corrosion blocker should be applied to the pump
after all hydraulic and electrical connections are made and the
hydraulic system has been bled.
Configuring the Autopilot
The autopilot must be configured and tuned to your boat
dynamics. The Dockside Wizard and the Sea Trial Wizard on
the helm control are used to configure the autopilot. These
wizards walk you through the necessary configuration steps.
14