Seiwa SW AP03 - Manual (Page 40)

10. When both sides of the autopilot pump system have been bled, repeat the
bleed of the drive unit once again, top up the reservoirs, close them and
close the bleed nipples. Re-connect the pump wires to the Junction Box. The
system is now ready for the setup procedure.
Pump Output Adjustment
Some pumps (eg Octopus) have a flow rate adjustment which can be altered to obtain
the correct rudder response time. Check the Specifications chapter of this manual
(page 5-2) for the right value for your vessel. To adjust the flow rate, loosen the two
screws located on the pump body sufficiently to allow it to be rotated. (If they are
loosened too far, oil will be lost.) Rotate the pump body clockwise to decrease the flow
or anticlockwise to increase it.
Pump Maintenance
Reversing pumps have a minimum of moving parts and should give hundreds of hours
of service without requiring attention. If it fails to run, check first that it is receiving the
correct drive voltage from the Junction Box. Next, ensure that the pump shaft is not
jammed. (There is normally an access point by which it can be turned with a
screwdriver.) If it turns freely and still fails to run, check the motor brush gear.
If the pump runs but does not pump oil, make sure that the system is purged.
3.6.4 HYDRAULIC LINEAR DRIVE
Take care, when handling the ram, that the piston rod is not scratched during
installation. It is vital that the cylinder is installed with the correct geometry. The final
position of the mounting bracket is ascertained with the piston rod at the middle of its
stroke. (Use a ruler to set this position.) With the rudder dead centre and the piston
rod at right angles to the quadrant, mark the position of the bracket and fix it using four
stainless steel bolts with locknuts or lock-washers.
The recommended distances from the attachment pin to the centre of the rudder-
stock are given in Table 3.3.
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