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82 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook
5 Installing the ST4000+
Horizontal alignment
When viewed from above (as shown in the illustration above):
• the sensor arm must be between 75 mm (3 in) and 310 mm (12 in)
from the tiller arm
• with the rudder amidships, the sensor arm should be at 90° to the
connecting rod and directly opposite the cable entry point on the
sensor body
• when the rudder moves from hardover to hardover:
• the sensor arm and the tiller arm must remain parallel to each
other at all times
• sensor arm movement must not exceed +/- 60°: if the steering
system drives the sensor arm beyond these limits it will
damage the rudder position sensor
Maximum
permitted
travel: +/- 60˚
Cable entry
Parallel
Minimum: 75 mm (3 in)
Maximum: 310 mm (12 in)
90˚
60˚ 60˚
Min: 101 mm (4 in)
Optimum: 140 mm (5.5 in)
Max: 190 mm (7.5 in)
D5387-1
Mounting base
Tiller arm
or quadrant
Rudder position
sensor
Connecting rod
Ball joints (level)
Sensor arm
Parallel
Front view - rudder amidships
Top view - rudder amidships
Aft