Seiwa SW AP01 User Manual

Page 42

minutes to purge air through cylinder lines and help to clear the balance line
of air. Under no circumstances allow the oil level to drop in the manual
hydraulic helm units - this level must be maintained at all times during the
bleeding of the pilot unit.

When step 8 has been successful, run the motor in the opposite direction so
that both sides of the system are purged. Keep the helm pump reservoir
topped up during this operation.

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. If that
does not succeed, contact your Coursemaster dealer.

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