ComNav 1500 / 1510 Autopilot - 21 -
2.12 Piping the System
3/8” OD copper tubing suitable for a working pressure of 1,000 psi or equivalent is
recommended for all connections. Flexible hose may be used but must have a
rated working pressure of 1,000 psi.
2.13 Filling the System
Once the main steering system has been filled, open the Pumpset bleed screw
(labeled on top of Pumpset), two complete turns. Wait until clear oil, void of any air,
exits the bleed fitting. Re-secure the bleed screw. Be certain that the flow adjusting
wheel is set at the maximum flow position if applicable. Top up the uppermost helm
pump or reservoir, if necessary. Once the cylinder responds instantly, most of the
air has been removed and the system is usable. The remaining air trapped in the
system will vent automatically with use. Refill the steering system reservoir as
necessary with oil as recommended by the steering manufacturer. Where no
recommendation is available use hydraulic oil of viscosity grade ISO 32.
2.14 Linear Drive
The Linear Drive is only fitted on vessels with mechanical steering. The Linear
Drive consists of a hydraulic cylinder, which is connected to the mechanical
steering system to provide rudder steering drive for the Autopilot. A hydraulic
Pumpset is connected to the steering cylinder. The Pumpset motor is driven
clockwise or counter-clockwise by the Autopilot to produce port or starboard
movement of the rudder. When the Autopilot is turned off, a solenoid operated
bypass valve opens, permitting hydraulic oil to shuttle from one side of the
hydraulic cylinder to the other, allowing the mechanical system to regain control.
PILOT
DISTRIBUTION
BOX
RESERVOIR
SOLENOID
BYPASS VALVE
STEERING
CYLINDER
AUTOPILOT
CONTROL HEAD
PUMPSET
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