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Oil passages are machined as large as possible to minimize
any restrictions which may effect manual steering.
3.4 STEERING CYLINDER
The brass steering cylinder is engineered and manufactured
for heavy duty marine usage and is suitable for commercial
and pleasure boat applications. The cylinder has a 1-1/2” bore
and a 9” stroke. The trunnion mount (xed end) and the ball
joint allow for about 10 degrees of articulation. The cylinder is
shipped full of oil and is also equipped with bleed ttings.
4. INSTALLATION
4.1 MECHANICAL
The linear actuator drive unit must be mounted on a horizontal
shelf or bracket with a solid foundation. The unit can be bolted
or screwed down with the motor feet and the foot bracket.
The mounting brackets are tted with anti-vibration mounts
to maintain the quiet operation of the pumpset. The drive unit
should be mounted above the steering cylinder if possible to
assist in the system bleeding.
Proper cylinder installation is the key to the successful op-
eration of the linear actuator. An incorrectly installed cylinder
is subject to rapid seal and bearing wear and non-repairable
damage. Minimum side loading of the cylinder rod and maxi-
mum cylinder performance can be achieved as follows.
An imaginary line drawn through the tiller arm hole at both hard
over positions will create the cylinder center line, see Figure
4.1. The distance between X and Y must be less than 9” so
that the cylinder doesn’t act as an end stop for the rudder.
Figure 4.1 CYLINDER SCHEMATIC
TILLER ARM SHOWN IN THE HARD
OVER AND MIDSHIP POSITIONS
CENTER LINE FOR CYLINDER MOUNT
XY
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