Nexus 21 Water Pump 3 Manuel D’Utilisation

If the Pumpset is used together with the Nexus Linear Drive, fill the Linear Drive first and
then connect the Linear Drive to the Pumpset before filling the Pumpset. See the Linear
Drive oil filling procedure in separate manual.

Use hydraulic oil viscosity grade ISO 20. About 110 ml is needed for the Pumpset only
without piping. Fill the Pumpset via the reservoir.

Once the boats main steering system has been filled, open the Pumpset bleed screw (on
top of the Pumpset), two complete turns. Wait until clear oil void of any air exits from the
bleed screw, then resecure the bleed screw. Then fill up the uppermost helm Pumpset or
reservoir of the main steering system, if necessary.

Pumpset PF-0,3S with solenoid and reservoir

             Pumpset PF-0,3

Note! For correct
wire dimensions
see Nexus
Autopilot manual
”Wire Thick-
ness”.

Connect the Pumpset wires to the Nexus Servo Unit as follows:

•

 Orange wire to Servo Unit terminal marked "MOTOR 1".

•

 Black wire to Servo Unit terminal marked "MOTOR 2".

For Pumpset PF-0,3S with solenoid, connect also the two red wires as follows:

•

 One solenoid red wire to terminal marked 16 ”+”.

•

 One solenoid red wire to terminal marked 17 "GND".

It does not matter which wire red wire goes to which terminal.

When the complete electrical installation is checked and the power is turned on, there are
further procedures to be carried out in order  to completely remove any air in the system.
See 12 "Dockside Testing" of the Nexus Autopilot manual.