Brunswick 750 IMPACT, Operation & Maintenance Manual

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4-6
Section 4 Boat Systems
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. The system consists of the
following components:
• Steering wheel
• Sea Star II helm pump
• Teleflex hydraulic hoses
• Front-mount steering cylinders
• 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
engines from feeding back to the boat operator. The
lock valve will not allow the outboards to move unless
the steering wheel is turned. The lock valve also con-
tains a pressure relief valve which provides over-pres-
sure protection for the mechanical components, the
hydraulic 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 lines and then into the steering
cylinders. As the fluid is pumped into one side of the
steering cylinders, an equal volume of fluid is dis-
placed from the opposite side. The steering cylinder
bodies move to port. The cylinder bodies are con-
nected directly to the engine steering arms. The
engine steering arms also move to port and put the
boat into a starboard turn. The fluid displaced from
the steering cylinders returns to the helm pump reser-
voir.
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 engines in place.