Vetus OB150 Instructions D'installation page 8

Introduction
A hydraulic steering system consists basically of one or more
pumps and a cylinder, see Diagrams '1' and '2' *.
The pump HTPxx10R is fitted with a non-return valve. This pre-
vents any feel of rudder pressure at the steering wheel.
The pump is also fitted with a pressure-relief valve.
With a hydraulic steering system with two pumps, the non-
return valve also ensures that one pump can take over from
the other automatically, as well as preventing the running of the
unused steering pump. See Diagrams '1' and '2' *.
In a hydraulic system with three pumps (2 manual pumps and 1
EHP) the non-return valves are essential for the reasons above;
see Diagrams '3' and '4' *.
The EHP type 'R' is already equipped with a built-in check
valve.
Following the recommendations below will result in a longer life
and better performance of your hydraulic steering system.
• Only use the type of hydraulic oil as specified in the
Technical Data.
• Carry out regular maintenance.
*) See 'Hydraulic Diagrams' on page 32-33 for the various
connection diagrams.
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Fitting
During assembly, avoid any welding or paint splashes or dam-
age to the steering pump spindle and the piston rod. These
could damage the oil-control rings causing oil leaks.
Cylinder
In order to ensure proper bleeding, the air-bleed nipples should
point upwards.
Provisions should be taken to protect the piston rod against
damp, dirt and sea water.
The tilt tube (2) has already been fitted.
Grease the brass nut (1) supplied separately.
Screw the brass nut (1) supplied separately onto one side of
the tilt tube (2).
Push the rod (3) through the tilt tube (2). Fill up the space
between the tilt tube (2) and the 2 brackets (4) using the spacer
rings (5) supplied.
Finally, tighten the brass nut (1) and screw the brass nut lock
screw to the tilt tube (2).
Grease the moving parts of the S-link (7).
Note!
Tighten the self-locking nuts (6) in such a way that the complete
cylinder can still pivot on the tilt tube (2) while eliminating exces-
sive clearance.
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Hydraulic Steering Systems OB150, OB275
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