Auto helm Raymarine st4000 fault

[yelbis]

used the autohelm yesterday when the unit started crunching and appeared to lock up. I have dismantaled the unit and the three small plastic gears within the motor assembly appear OK as does the centre cog of the motor. If i was to observe this part whilst disasembled and alter the control a few degrees, would the centre cog rotate, as it seems as though the unit has has no 12 volt getting to it, of course I have loaned out the Voltmeter.

Any advice I can not find the manual.

Thanks.

 

[Cardiffcruiser]

Not sure about the cause of the fault but you can get a copy of the manual here http://www.raymarine.co.uk/customer-supp...opilot-manuals/

And yes the motor will rotate if you ask it to alter course when in auto. I had a wiring fault with mine and did the same whilst trying to find the fault.

 

[misterg]

The service manual is also around online, e.g. here (pdf) .

I've had mine in bits, but can't remember the gory details. The control only supplies 12V when it wants the motor to turn - you can run the motor directly off a 12v supply without needing the control head if you wish.

IIRC, the small 'planet' gears have a boss on one end, so need to be fitted the right way around (boss against the mylar(?) washer inside the red 'annulus'? I think.)

Andy