Linear Drive Installation - Yamaha Enduro 8 Manual

Linear Drive Unit: Installation
Electro-hydraulic Linear Drive for Tiller-Steering
and mechanical Wheel-Steering
Geometric Situation
Fist of all, the geometric layout must be
determined. The support with the joint at the
rear cylinder end will be attached to the hull
structure. The piston rod will be connected to
the rudder arm with a bolt.
The cylinder may be mounted in front or
behind the rudder shaft, the sense of rotation
does not matter.
The piston rod must move in the same
plane as the rudder arm. This is achieved by
aligning the cylinder support mounting surface
perpendicular to the rudder shaft. The length
of the rudder arm "F" can be taken from the
table next side. The lateral distance "G"
should be about (0.86...0.90)R.
The required length of the autopilot tiller
arm can be determined after measuring the
vessels' maximum rudder deflection: shortly
before each cylinder end position, full star-
board or port rudder should be reached. Do
not use the cylinder as the mechanical rudder
limiter.
The standard rudder angle sensor is pro-
viding the rudder angle output signal for an
angular range of +/- 45 degrees.
The maximum available rudder deflection
under autopilot or servo steering can be
changed. See "Autopilot Function / Initial Op-
eration" or "Control Wheel Function / Initial
Operation".
Installation Hints
The autopilot tiller arm must be locked onto
the rudder shaft by a key or wedge. Transmis-
sion of the torque by friction alone requires a
very heavy design of the arm.
In case a rudder quadrant is present, the
piston rod should be attached to it, eliminating
the need for a separate tiller arm.
The drive installation must be very rigid
and stiff. Especially the distance between rud-
der shaft and rear cylinder mount must not
change under the load of the cylinder force.
Installation
1. Replace the transport tank cap with the
cap from the box; it has a breathing hole!
2. Purge air now according procedure be-
low! Then remove the rudder angle sensor
from the tiller arm bolt and keep it hanging on
the cylinder rod with its hook. Then tighten the
tiller arm bolt and the cylinder support screws.
Reinsert the rudder angle sensor into the tiller
arm bolt,
Purging the Hydraulic System
Before installation, it is necessary, to purge
air from the hydraulic cylinder and to add au-
tomatic transmission fluid to the hydraulic
tank, but not more than half full. The "ship-
ping" tank cap has to be replaced with the
regular one, with a breathing hole, before
moving the piston and use of the drive.
For verification connect the Bypass Valve
to the battery. Even under great force, the
piston rod cannot be moved more than 1 mm
(1/32 in.) if air has been purged completely.
The following symptom will always require
purging of the system:
If the rudder can be moved mechanically
(by direct force onto the rudder), when the
autopilot or Servo Steering is engaged. Ex-
ception: very small movements of the piston
(less than 1 mm) are permitted.
To purge air: disconnect the rudder and the
sensor. Switch on SERVO or AP and turn the
sensor shaft slowly until the piston hits the
cylinder end firmly. Then hit the other end
firmly. Repeat 10 times with full rudder speed.
but do not lock its shaft with the M3 lock-
ing screw yet. This will be done during "initial
operation".
Fill up the hydraulic tank half way (use
automobile automatic transmission fluid avail-
able at gas stations). Never use "hydraulic
fluid"!
Installation of detached pumps
The pump must be located higher than the
cylinder. Air from the cylinder must be able to
ascend to the pump. The reservoir must be
the highest point in the system.
Adjustment of pump flow
Some pumps permit mechanical adjust-
ment of the pump flow. Always select the max-
imum pump flow (factory setting).
Rudder Speed Selection
A high maximum rudder speed is desirable
for good autopilot function. However it is
a must for Servo Steering. A low maxi-
mum rudder speed can lead to heading
oscillations. Danger! Therefore the maximum
available rudder speed (pump flow) should
always be selected. The Tecnautic Drive-Box
is regulating the pump speed electronically
and reducing rudder speed automatically,
whenever necessary.
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