HYDRAULIC CYLINDER FOR OUTBOARD ENGINE
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page 7
of 78
Installation and Maintenance Manual
ULTRAFLEX
E
N
G
L
ISH
ULTRAFLEX
hydraulic steering systems should not be used in racing applications.
To avoid product damage, do not disassemble pre-assembled components.
All
ULTRAFLEX
steering systems must not be installed on boats equipped with engines whose maximum
horsepower is higher than the horsepower rating approved by boat manufacturer.
1.2 Warnings for the product correct use
Before beginning the installation, check the mounting compatibility of the UC128-TS cylinder to the engine
by consulting the attachted document "Application Guide" contained in the packaging.
Do not modify the steering cylinder in any way to fit it to your engine application, otherwise the cylinder will
no longer operate in safety and it will endanger the boat and the occupants.
WARNING
WARNING
WARNING
DANGER
DANGER
1 PRODUCT DESCRIPTION
1.1 Hydraulic steering system operation
All
ULTRAFLEX
hydraulic steering systems are designed in conformity with UNI-EN-ISO 10592 and A.B.Y.C. P21
regulations. All
ULTRAFLEX
steering systems can operate at temperatures between -18°C (0°F) and +77°C
(+170°F). All the components are made for the marine environment, using materials and working processes
which offer long life and safety under the most extreme conditions. A hydraulic steering system consists of
a steering pump, a cylinder tied to the rudder or to the outboard or
sterndrive engine and the connecting hoses (see picture). Under
normal operating conditions, a turn of the steering wheel will pump
the oil, which flows in through the hoses to the cylinder, according
to the turn direction. With the consequent cylinder movement the oil
will flow to the pump through the hoses and at the same time moves
the engine or the helm which are connected to the cylinder. The
pumps are equipped with a valve, which prevents outgoing fluid
from returning along the same hose. It also allows the operation of
the steering systems with two or more steering stations. The
cylinders are double acting and may be balanced or unbalanced. In
the unbalanced cylinders the two chambers have different volumes
and so they need a different number of turns of the steering wheel
and a different rotation effort. The balanced cylinders have same
number of steering wheel turns in order to move the helm from the
center to the end stroke in the two opposite directions. A well balanced steering system needs a correct
choice of the pump for the cylinder.
ULTRAFLEX
produces different pump models, which have different capacity
(cm
3
of oil moved each steering wheel turn) and for each type of installation. While choosing the pump it is
important to consider the cylinder volume. The number of starboard and port turns is determined by the
ratio between the cylinder volume and the pump capacity.
Example
: if the pump has a capacity of 28 cm
3
[1,7cu.in.] and the cylinder has a volume of 120 cm
3
[7,3cu.in.], the
formula looks like this: 120/28=4,2. Accordingly, the steering wheel will turn 4,2 times before the cylinder
will completely turn from one side to the other. In case of installations with double cylinders connected in
parallel the cylinder volume must be added. Applications with less than 4 turns are not recommended, as
they need a higher effort, also applications with more than 8 turns are also not recommended, as the
response of the boat to steer is slowly. The maximum operating pressure is 7,0MPa (70 bar) (1000 PSI).
l
engine
hydraulic
hose
cylinder
l
l
l
pump
Summary of Contents for UC 128-TS
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