Garmin GHP 20 Marine Autopilot System with SmartPump Installation Instructions Manual page 7

Shadow Drive
Starboard line
Return line
Port line
Shut-off valves
Pump
Helm
Steering cylinder
Dual-Helm without Power Assist Layout
Return line
Shadow Drive
Starboard line
Port line
Shut-off valves
Pump
Upper helm
Lower helm
Steering cylinder
Single-Helm with Power Assist Layout
The pump must be installed between the cylinder and the power-assist module to function correctly.
NOTE: Removal of the power assist-module may be necessary to gain access to the fittings, hoses, and bleed-tee fitting.
NOTICE
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