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Re: Raymarine SPX-5 Wheel Pilot rattles
No way to prove it but I'm leaning toward Raymarine having made some poorly-engineered or cost-cutting changes when they built their own brand of motor drive to replace the venerable AutoHelm drive that was part of the AP wheel system they bought from AutoHelm...
Olson is probably correct. Less expensive wheel pilots are made with less expensive parts. Manufacturers often turn to cheaper parts to keep costs down. Quality suffers more than your checkbook. Sad to say, but you get what you pay for (which is okay, as long as you understand this).
If you've installed the unit yourself, and are confident it functions correctly (smooth operation of the wheel when AP is engaged, not binding or grinding) then the most likely answer is "normal ops".
Not all who wander are lost. - JRR Tolkien