Raymarine ST7000, Installation Instructions Manual

Page: 10 / 55

1.2 Drive Systems
The ST7000 offers a choice of Mechanical or
Hydraulic Drive Units. All vessels with hydraulic
steering will require a hydraulic drive unit (see
section 1.2.3).
Mechanical steering systems may be driven with
either a rotary or linear drive unit. If space permits
the linear drive unit provides the simplest
installation by connecting directly to the rudder
stock tiller arm. It may also be used to power
steer the vessel if steering linkage failure occurs.
1.2.1 Rotary Drive Units
The Autohelm Rotary Drive Units provide smooth
powerful steering commands with virtually silent
operation.
A rugged electric motor drives a precision
epicyclic gearbox via a high tensile belt drive. An
electronic clutch is totally fail-safe yet transmits
high torque loads with no slippage.
The drive units can be mounted in any attitude
simplifying installation.
6