Raytheon ST4000+ Autopilot Problems

[K. Kuehn]

I have autopilot steering problems with a Raytheon ST4000+ unit. At cruising RPM's (2000RPM) the autopilot is unable to maintain a course even in flat seas and no wind. A small powerboat bow wave is sufficient to throw her permanently off course. Tech reps claim there is nothing wrong with the unit. It does work better at lower RPM's (and slower boat speed). Before I go to the factory, I'd like some feedback on: 1. Has anyone experienced the same problem? 2. What is the boat size, engine size, and number of blades on the prop? 3. If the problem was resolved, how was it accomplished?Thanks.PS. I've taken two long boat trips in the Gulf of Mexico, and when I needed to power because of light winds, I've had to hand steer since the autopilot is so unreliable.

 

[Pat]

Autopilot

We have a new 320 and had the same problem. After talking to the factory they suggested that I re-swing the compass. That seemed to solve the problem. Hope this helps

 

[Dave Emery]

Autopilot Woe's

You might also check the auto pilot compess heading versus your magnetic one. You should do this while motoring slowing and at 2000 rpm's. This should be accomplished with the autopilot disengaged. If the flux gate compess(autopilot compess)is near a battery cable you may be picking up interference when the alternator's output is high 2000 rpm's. If the autopilot works fine during sailing this might also be an indication of this type of problem.

 

[Ben]

Autopilot problems

I had an autopilot problem after putting a cockpit stereo speaker too close to the autopilot's compass. Moved the compass and the autopilot works fine now.