Kobelt 7012 Series, Owner'S Operation, Installation & Maintenance Manual

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Helm pump-7012 Kobelt Manufacturing Co. Ltd.
Rev A MNL-7012 12 of 32
6 C
OMMISSIONING
6.1 H
YDRAULIC
F
ILL
& B
LEED
6.1.1 Filling a Single Station System
1. The pump(s) should be set to maximum volume prior to filling and bleeding the
system.
2. Fill the helm pump with hydraulic oil using a funnel or filling tube. Be sure to re-
install all filler plug. If a header tank is installed, fill the header tank to about ½ full.
3. Turn the wheel slowly in one direction until the pump starts to operate, at which
point the level in the helm pump/header tank will go down.
4. Check the oil level frequently and top up as required.
5. Continue to turn the wheel in the same direction, until some resistance is felt.
6. At this point, the cylinder may be observed to move.
7. Open the bleed fitting on the cylinder on the side into which the oil is passing.
8. Continue to turn the wheel once again at about one turn per second and ensuring a
good head of oil on the pump until clear oil and no air emerges from the bleed fitting
on the cylinder.
9. Close the bleed fitting and do not turn the steering wheel in the opposite direction.
10. Provided the head of oil has been maintained and the wheel has been turned slowly,
this side of the system should now be reasonably free of air.
11. Continue to turn the wheel until the cylinder moves to the hard over position.
12. There should, at this point, be a significant resistance to further turning.
13. Now turn the wheel in the opposite direction. There may be, at this point, a blow-
back of air up the tubing into the pump, which can expel oil with some force from
the funnel, or filling tube. A rag held over the top will prevent the oil from splashing
over onto the surrounding area. If the oil level in the funnel has dropped, refill to
ensure that the head of oil is maintained.
14. Open the bleed fitting on the pressure side (opposite side) of the cylinder and
continue to pump until clear oil and no air is issuing from the bleed fitting.
15. Close the bleed fitting.
16. Fill the helm pump/header tank to the correct level.
The system should now be reasonably free of air and the cylinder should operate in both
directions when the wheel is turned to either starboard or port.
Residual air may be removed from the system as follows:
Put the wheel hard over in one direction and apply pressure to the wheel. On breaking the
hydraulic lock and turning the steering wheel in the opposite direction, air may be observed
coming up the funnel or filling tube (Sometimes with considerable force).
Repeat this procedure in both directions several times.