Steering System - Boston Whaler 19 Guardian Series Operation And Maintenance Manual

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 system requiring no electrical pumps
or motors. The system consists of the following com-
ponents:
• 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 outboard 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 compo-
nents, the hydraulic hoses, and the fittings.
When the steering wheel is turned clockwise, hydrau-
lic oil is pumped out of the helm unit, into the starboard
hydraulic line and then into the steering cylinder. As
the oil is pumped into one side of the steering cylinder,
an equal volume of oil is displaced from the opposite
side, moving the steering cylinder body to port. The
cylinder body is connected directly to the engine's
steering arm, which moves the front of the engine to
port and puts the boat into a starboard turn. The oil
displaced from the cylinder returns to the helm pump.
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.
4-2
Boat Systems