Vetus MTC30 Manuel D'installation page 12

3 Filling and bleeding
Note: The numbers in bold type point out to the drawing numbers on
the pages X-2 and X-3 in the centre of this manual.
Use the diagrams on page X-2 for a hydraulic system with separate
dual non-return valve and a pump, or pumps, without built-in non-
return valves.
Use the diagrams on page X-3 for a hydraulic system with a pump, or
pumps, fitted with built-in non-return valves.
The hydraulic system should be filled at the highest point, i.e. the
(top) steering pump or the extra oil expansion tank.
Remove the filler cap from the (top) steering pump or oil expansion
tank.
Fit a hose pillar (G 3/8) with funnel to the filler opening.
Steering System with 1 steering pump
2-1 Open air bleed nipple 'A' . Move the piston rod until the piston
reaches the end cover 'A' .
Now slowly turn the control wheel on the steering pump in the
direction shown. Stop turning as soon as the oil from bleed nip-
ple 'A' contains no more air.
Close the bleed nipple. DO NOT turn the control wheel in the
opposite direction.
2-2 Open air bleed nipple 'B' . Turn the control wheel until the piston
reaches the end cover 'B' .
2-3 Now slowly turn the control wheel in the direction shown.
Stop turning as soon as the oil from bleed nipple 'B' contains no
more air. Close the bleed nipple.
Fill the steering pump or oil expansion tank to the correct level.
The oil level should be checked often during the first few days after
filling to check the level and top up if necessary. The oil level can fall
as minute air bubbles escape.
12
020105.03
Fill the steering head or expansion tank with hydraulic oil.
With dual operation system, remove the filler cap from the lower
steering head and refit as soon as oil comes out of the filler open-
ing.
For the type of hydraulic oil, see 'Technical data' .
During filling, ensure that there is always sufficient oil in the steering
head or expansion tank; if the steering pump sucks in air it will have
to be bled again.
Fill the steering head or expansion tank slowly and carefully to pre-
vent air being taken in with the oil.
1 Fit a length of hose, 8 mm. dia. (MTC30: 6 mm), to the air bleed nip-
ples; open the nipple by turning the hexagonal nut to the left.
Steering System with 2 steering pumps
3-1 Open air bleed nipple 'A' . Move the piston rod until the piston
reaches the end cover 'A' .
First, slowly turn the control wheel on the lower steering pump
in the direction shown. Stop turning as soon as oil from bleed
nipple 'A' does not contain any more air. Now, slowly turn the
upper steering pump control wheel in the direction indicated.
Stop turning as soon as no air can be seen in the oil coming
from nipple 'A' . Close the air bleed nipple. DO NOT then turn
either of the control wheels in the opposite direction.
3-2 Open air bleed nipple 'B' . Turn the control wheel on the lower
steering pump until the piston reaches the end cover 'B' .
3-3 First, slowly turn the control wheel on the lower steering pump
in the direction shown. Stop turning as soon as oil from bleed
nipple 'B' does not contain any more air. Now, slowly turn the
upper steering pump control wheel in the direction indicated.
Stop turning as soon as no air can be seen in the oil coming
from nipple 'A' . Close the air bleed nipple.
Fill the top steering pump or oil expansion tank to the correct
level.
Air in the steering pump can be recognised by a gurgling noise when
the steering wheel is turned.
Hydraulic Steering Systems 30 - 175 kgm