English - Vetus MTC30 Manual De Instalación

1 Introduction
A hydraulic steering system basically consists of one or more pumps
and a cylinder. See diagram 'A' *.
When the steering system includes just one pump, a non-return
valve can be installed between the cylinder and the pump. This pre-
vents pressure on the rudder being felt at the helm.
This non-return valve can be fitted separately or a pump with built-in
non-return valve can be fitted.
N.B. A pump with built-in non-return valve is also fitted with a pres-
sure release valve.
See diagrams 'B1' and 'B2' *
When a separate non-return valve is fitted, the unused connection,
for a second pump, must be sealed off.
When a hydraulic steering system with 2 pumps is used, a non-return
valve must be fitted. This ensures that the one pump can automati-
cally take over from the other, and also prevents unnecessary rota-
tion of the unused steering pump. See diagrams 'C1' , 'C2' , 'D1' and 'D2' .
Either a separate dual non-return valve can be fitted or use two
pumps with built-in non-return valves.
For the reasons given above a hydraulic steering system with 3
pumps must also be fitted with non-return valves.
Examples are given in diagrams 'E1' and 'E2' of systems with an Elec-
tro-Hydraulic Pump (EHP) (with non-return valve) and 2 manually
operated pumps.
The VETUS EHP type 'R' is already equipped with a built-in non-return
valve.
Examples are given in diagrams 'F1' and 'F2' of systems with an Elec-
tro-Hydraulic Pump (EHP) (without non-return valve) and 2 manually
operated pumps.
The EHP (with reversible motor) is shown in diagrams 'F1' and 'F2'
connected via a separate (dual) non-return valve. For the manually
operated pumps diagrams 'E1' and 'F1' show a separate dual non-re-
turn valve and diagrams 'E2' and 'F2' show pumps with built-in non-
return valves.
A by-pass valve must be fitted when emergency steering with a tiller
is required.
With an open by-pass valve, the oil can flow easily from one side of
the piston to the other and the hydraulic system will not interfere
with the emergency (tiller) steering. See Diagram 'G' .
Following the recommendations below will ensure a longer life and
better performance for your hydraulic steering system.
• Only use one type of hydraulic oil, as specified in the Technical
Data
• Carry out maintenance regularly.
*) For the various connecting diagrams, see Hydraulic circuit dia-
grams, Page 48 - 51
Hydraulic Steering Systems 30 - 175 kgm
2 Fitting
During assembly, prevent welding spatters, paint splashes and dam-
age to the steering pump shaft and piston rod.
Damage can destroy the oil seals and cause leaks.
2.1 Steering Pump
The filler cap and balance tube must always be on top of the unit, at
the highest point.
*) When more than one pump is fitted, all oil reservoirs must be con-
nected by balance tubes.
The steering pump may
be installed in any posi-
tion between horizontal
and vertical.
Fit the threaded rods supplied into the steering pump using Loctite
The steering pump is fitted with a filler plug without air hole as
standard. Single station system (1 steering pump): a filler plug with
air hole should be fitted.
Dual station system (2 steering pumps): a filler plug with air hole
should be fitted in the upper steering pump.
A filler plug with air hole is supplied separately.
2.2 Cylinder
The cylinder air bleed nipples should point upward to ensure effec-
tive bleeding.
A Max. stroke of cylinder
B Rudder limit stops
Positioning of rudder limits
Rudder limit stops must be fitted to prevent over stressing the cylin-
der when the piston is at top dead centre.
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.

ENGLISH

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2 ... 3 mm (0.078 ... 0.125")
2 ... 3 mm (0.078 ... 0.125")
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