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post #30 of Old 11-14-2012
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Location: Solomons, MD
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Re: Autohelm ST4000 Plus problems

The gear (14 teeth) that presses on the Q114 Motor spindle of the Z327 Tiller Autopilot in the ST4000+ system.

I have the old gear from the old motor + a new Mabuchi RS-555SH motor. However, the old gear appears worn and freely spins on the shaft of the new motor. I'm looking into possible new gear sources before trying to fix the old gear to the new motor and possibly ruin both.

Raymarine Dealer quotes Q114 motor for about $100.00. I've heard that it's possible that newer Q114 parts come with 19T gear instead of 14T. Dealer wasn't able to confirm which. In any case, for that price I will junk the ST4000+ and look into a new ST2000.

Some of the RC model gears look like promising substitutes and inexpensive enough to experiment with. The gear appears to be similiar to 3.17 mm shaft, 0.5 Modulus, 14T brass. But do you have access to the correct gear?

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