Re: Hayward Navigator going in circles
Peter, what was the long term outcome? Did it continue to work properly or did it return to going in circles?
I've got an older Hayward Aquadroid (which is very similar on the inside) and in the last year I've replaced everything except the body/shell - it's been doing the circle thing for a long time now but I've been too lazy/busy to deal with it (also over the winter it wasn't that much of an issue for me). Again, essentially it's brand new except the shell as I've literally replaced ALL the other parts. Feet are good, springs in feet are good, wings are good, pods are good, action is good, impellor is clear, no debris, etc. As I recall the gearbox was turning just fine with the proper whirring noise, when last I had it out.
I reckon I can take it apart and see if the simple action of putting it all back together causes the same unexplainable "fix" you got doing that. When I get around to it (did I mention the busy/lazy thing?) I'll post back here any updates.
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Okay, I took it all apart and sure enough the gearbox wouldn't whir when blown into, so I took it all apart and found that there was a small (pea sized) wad of fiberous organic material (probably grass clippings and leaf bits) which almost resembled a wet knot of string, that was jammed in the gears. I put it all back together, blowing into the opening as I added each gear back in to ensure it was turning, and then reassembled the droid. Voila! It's running like a champ!

FYI for anyone with a similar cleaning droid:
• The gearbox is actually quite simple, just pay attention to how you take it apart and how it goes back in.
• There are six (6) loose gears, and one sort of paddle-wheel looking gear that's fixed.
• When you blow into the small opening with all the gears out, the one that's permanently in there will spin freely, but as you add gears they spin progressivly slower and you won't be able to turn them by hand. It's a gear reduction thing. Don't worry, as long as you hear the whirring noise when you blow into it, they're turning. It's just a VERY slow turn by the time you get the last one on there.

• Take the time to wipe off any little bits of grit, leaf particles, dirt, whatever - it'll help ensure you don't have to repeat the process in the near future.