Steering System - Boston Whaler 20 Justice Series Operation & Maintenance Manual

Section 4 Section 4 Section 4 Section 4 Section 4

Steering System

The steering system installed in your boat is a Teleflex
Sea Star II hydraulic system. This is a manually oper-
ated, closed-loop hydraulic system requiring no electri-
cal pumps or motors.
following components:
• Steering wheel
• Sea Star II helm pump
• Teleflex hydraulic hoses
• Front-mount steering cylinder
®
• Aero Shell #41 fluid
The Sea Star II helm pump is an axial piston pump
specifically designed for manual steering. It has a
built-in lock valve to prevent the steering load of the
engine from feeding back to the boat operator. The
lock valve will not allow the engine to move unless the
steering wheel is turned. The lock valve also contains
a pressure relief valve which provides over-pressure
protection for the mechanical components, the hydrau-
lic hoses, and the fittings.
When the steering wheel is turned clockwise, hydrau-
lic fluid is pumped out of the helm unit, into the star-
board hydraulic line and then into the steering cylinder.
As the fluid is pumped into one side of the steering cyl-
inder, an equal volume of fluid is displaced from the
opposite side. The steering cylinder moves to port.
The steering cylinder is connected directly to the
engine's steering arm. The engine's steering arm also
moves to port and puts the boat into a starboard turn.
The fluid displaced from the steering cylinder returns
to the helm pump reservoir.
Turning the steering wheel counter-clockwise results
in a similar response, but in the opposite direction.
When no course correction is required, the lock valve
holds the outboard engine in place.
4-6 4-6 4-6 4-6 4-6
Boat Systems Boat Systems Boat Systems Boat Systems Boat Systems
The system consists of the