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If the boat has a single helm pump system without check valves, you must
incorporate a double pilot check valve (part number: M81166) as shown in
Figure 3.
A double pilot check valve may also be necessary on long pipe runs - other-
wise pipe expansion may cause poor autopilot performance. Install the check
valve as shown in Figure 3.
Note:
If the boat has two steering positions, it will already have check valves installed so
the two wheels can operate independently.
Hydraulic steering systems
There are three basic types of hydraulic steering systems:
two line system
three line system
two line pressurized system
On the following pages we describe each type of system and typical connection
points for the autopilot pump. For all of these systems you will need to connect a
third hydraulic pipe as shown between the autopilot pump and the helm pump or
dedicated system reservoir.
87039_2.fm Page 9 Wednesday, April 9, 2014 2:56 PM
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