Seiwa SW AP03 - Manual (Page 42)

(c) Disconnect the red solenoid wires from the autopilot and apply power
directly to the solenoid.
(d) Move the piston through its full stroke, one way, then the other. Any air
in the system will bubble into the reservoir. Refill the cylinder and
repeat until all air has been purged from the system.
(e) Re-tighten the bypass screws and reconnect the red solenoid wires.
Maintenance
Check the oil level in the pump at regular intervals. Grease the mounting
bracket every 3 months using waterproof grease.
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