Seiwa SW AP03 User Manual

Page 39

Connect the pump to the system tubing using hose and tubing which is
rated for the steering system pressures as specified by the manufacturer.
Short lengths of reinforced high pressure hose should be used to isolate
mechanically the Octopus pump from the rigid tubes of the system, as this
reduces noise and vibration. The bleed line should not be too narrow as the
system may be difficult to purge and may cavitate. Avoid air traps by
sloping the pipes upwards from the drive unit.

Make sure that there is no foreign matter, such as swarf, in the lines as this
may foul the valves and pump. Similarly, thread sealant should be carefully
applied well back from the end of the thread.

Teflon tape should not be used.

Secure the pipes where necessary to avoid 'pipe whip', since sustained
mechanical vibration in the pipes can cause hardening and cracking of the
copper.

Never install a drive unit without the third (balance) pipe, since the internal
pressure build-up could destroy the seals in the pump.

Using 20 amp cable, connect the two pump wires to the Motor terminals in
the Junction Box (see Figs 3.1 or 3.2), noting that no connection is made to
the clutch drive in this type of installation. The polarity of the connection is
not important.

Fill both the steering system and the pump completely with hydraulic fluid
and bleed the hand steering components according to the instructions
supplied by the manufacturer.

After this bleeding operation, leave the reservoir in the helm open and keep it
topped up with fluid. Open the bleeder nipple(s) in the slave cylinder. Run
the drive pump in one direction by temporarily removing the drive wires and
connecting them directly to the battery. Allow the motor to run for 2 or 3
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.