Hose Connections; Filling And Bleeding - Vetus OBC115A Manual De Instalación

3 .3

Hose connections

Hydraulic hoses and the way they are installed are of crucial impor-
tance for the safe operation of the steering system. VETUS only rec-
ommends the use of HHOSE or equivalent hoses.
The individual components of the hydraulic steering system are to be
connected using nylon hose HHOSE8 (8 mm inside, 12 mm outside)
in combination with hose fitting HS1031 or HS1037. To reduce hose
resistance, always keep connecting hoses as short as possible.
In connection with venting the system it is recommended to install
the horizontal pipes/hoses with a slope of about 3 cm per metre, the
pump side higher than the cylinder side.
- Make sure that the cylinder is centred on the engine.
- Install the hoses in such a way that the risk of external damage
or deterioration due to chemicals and high temperatures is low.
- Protect the hoses, which have to pass through a bulkhead with
bulkhead grommets or use bulkhead couplings.
- Bends must be absolutely free from kinks; a kink in the hose re-
duces the free passage of the hydraulic oil.
- After installation, blow through the lines with nitrogen or (com-
pressed) air (never water!) to check for and remove any blockages.
- The minimum bending radius of the nylon hose is 90 mm.
- Always attach the pipe with brackets; bracket distance about 60
cm.
Shortening of the hose must ONLY be done by cutting.
Mounting the nylon hose in the fitting
• Step 1: After cutting, screw the hose coupling sleeve onto the
hose (left-hand thread); stop approx. 1.5 mm before the breech.
• Step 2: Oil the hose coupling and screw it into the sleeve. Make
sure that the inner hose jacket does not rotate or get compressed
when screwing in.
3 .4

Filling and bleeding

Steering with one steering pump
Filling of the hydraulic system must take place at the highest point
of the system.
In order to prevent the oil from absorbing air, the filling of the
steering pump or the expansion tank should be done gently .
vetus® Installation manual Hydraulic steering cylinder for outboard engines OBC115A, OBC175A and OBC250A
2 1
HS1031
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• Remove the filler cap from the (upper) steering pump or the oil
expansion tank.
• If necessary, fit a hose nozzle (G 3/8) with a funnel to the filling
connection.
• Fill the steering pump or the oil expansion tank with hydraulic oil.
In the case of dual controls, temporarily remove the filler cap from
the lower steering pump and reinstall it as soon as oil comes out of
the filler neck.
• Remove the protective caps from the bleeding nipples and tem-
porarily replace them with a piece of hose with a diameter of 8
mm. The bleeding nipple can be opened by turning it one turn
anti-clockwise.
Collect the oil that flows out of the steering pump(s) and
bleeding nipples during filling and venting .
• Turn the steering wheel slowly to starboard so that the oil can flow
out of the hoses. Unscrew the venting nipple on the port side and
let the air and oil (bubbles) come out.
Keep turning the steering wheel to starboard. When the oil comes
out of the air vent without bubbles, carefully close the air vent. Do
not tighten the air vent too much. Continue to turn the steering
wheel in the same direction to fill the cylinder chamber. During
this phase, the cylinder chamber will move in the opposite direc-
tion until it reaches the end stop.
• In the same way, turn the steering wheel slowly to port so that
the oil can flow out of the hoses. Unscrew the air vent on the star-
board side and let the air and oil (bubbles) come out.
Keep turning the steering wheel to port. When the oil comes out
of the air vent without any bubbles, carefully close the air vent. Do
not tighten the air vent too much. Continue to turn the steering
wheel in the same direction to fill the cylinder chamber. During
this phase, the cylinder chamber moves in the opposite direction
until the end stop.
ENGLISH
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