second time in three years I had an AP pump failure “Rudder movement failure” Took me a while to figure it out the first time around... turned out to be dirty motor brushes. Is that common with these pumps?
Mine hasn't been serviced in the 20 years I've owned it and I highly doubt the previous owner touched it. I use it every time I use the boat. Is this on your personal boat?
No, on the Lazzara 84 I run. 10 years old... mains have 3000 hours half of that in the last 3 years, most wiTh AP on
Do you have the resources to check the operating pressure? I'm wondering if the load is high this causing excess current draw through the brushes.
Check to see if there is wear on the commutator, usually it becomes concave. On some, depending on wear you can remove the armature and take a few thousands off the commutator on a lathe. Fitting new brushes, I always get a sanding drum that matches the radius and sand in the curve. Putting flat brushes in causes a lot of electrical arching that can damage the commutator, insulation on the windings or the brush itself.