Vetus MTP89 Instructions D'installation page 10

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 protected from damp, dirt and sea water.
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
possible; 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
absolutely flat surface.
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
sealants must be used with great care, sealant in the hydraulic
system will create problems.
For sealing use aluminium or copper sealing washers.
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
resistance.
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
resistance 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 min-
imum.
Hoses or tubes which pass through a partition must be protect-
ed 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.
Hydraulic Steerings 230 - 1200 kgm
The cylinder must always be connected with the supplied flexi-
ble hoses (2 pcs), so that it can move freely. These 2 pieces of
flexible nylon hose should be fitted with a large bend radius.
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.
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
cylinder 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 piv-
ots of cylinder support and clevis.
ENGLISH
9
2.0108