Vetus MT230 Instructions D'installation page 11

Fix the base of the cylinder to a sufficiently sturdy foundation; this
must be strong enough to accommodate the force (push and pull) of
the rudder on the cylinder.
It is best to install the cylinder in a dry, well ventilated space. If this
is not possible, take measures to ensure that the cylinder rod is pro-
tected from damp, dirt and sea water.
2.3 Valves
• Single non-return valve with by-pass valve
• Dual non-return valve
• Pressure relief valve
Fit a (dual) non-return valve as close to the steering cylinder as pos-
sible; the pressurized tube between non-return valve and cylinder,
which remain under presssure, must be as short as possible.
If a pressure relief valve is installed it must be installed between the
cylinder and the non-return valve.
Mount a dual non-return valve or a pressure relief valve on an abso-
lutely flat surface.
2.4 Connections
The connections of all components are provided with female pipe
thread G 1/2.
Never use Teflon tape for sealing the screw connections; liquid seal-
ants must be used with great care, sealant in the hydraulic system
will create problems.
For sealing use aluminium or copper sealing washers.
2.5 Hose and Tube Installation
The hydraulic steering components are to be connected with copper
or steel tubes. Use special hydraulic (internally cleaned) tubes.
Always keep tube lengths to a minimum to reduce internal resist-
ance.
If possible apply for the tubing from lower helm unit to the non-
return valve the same lenght as for the tubing from the upper helm
unit to the non-return valve; this will prevent differences in resist-
ance of the tubing.
It is recommended that the horizontal tubes be fitted at an angle of
about 3 cm per metre / 3/8 in per ft (pump side higher than cylinder
side) to ensure satisfactory bleeding.
Install the tubes in such a way that the risk of external damage and
corrosion or the effects of chemicals is reduced to the minimum.
Hoses or tubes which pass through a partition must be protected
with bulkhead sleeves, or bulkhead connectors.
Bends must be completely free of kinks; a kink in the tubing restricts
the free flow of hydraulic oil.
Avoid long straight sections durinb fitting; the length of the tube is
affected by ambient temperature.
The cylinder must always be connected with the supplied flexible
hoses (2 pcs), so that it can move freely. These 2 pieces of flexible
nylon hose should be fitted with a large bend radius.
Hydraulic Steerings 230 - 1200 kgm
After installation, blow through the piping with nitrogen or com-
pressed air to check for blockages and to remove any dirt.
Always secure the tubes with brackets; distance between brackets
about 60 cm (2 ft).
Always remove any burrs after cutting the tube.
3 Maintenance
• Check the oil level in the top steering pump regularly. When
the installation includes an extra oil expansion tank the oil level
should be halfway up this tank.
• Check regularly to ensure that the steering pump shaft and cyl-
inder piston rod are not dirty; clean when necessary to prevent
damage to the oil seal.
• Drain and replace the hydraulic oil once every 2 years, or after
every 200 operating hours.
• At regular intervals, lubricate at the cylinder side both the pivots
of cylinder support and clevis.
ENGLISH
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