Had same problem this summer. Culprit are 1/16 inch diameter roller pins.
Can't remember length. Ace hardware carried them. Also Fastenal stores carry.
Hope yhis helps.
Bill Walker
36
Evening Star.
----- Reply message -----
From: "Tortuga" <tortugas...@gmail.com>
To: <cnc-list@cnc-list.com>
Subject: Stus-List ST4000 wheel drive problem
Date: Wed, Sep 12, 2012 10:52 am
During our last sail, the wheel drive for the Autohelm
ST4000 on our 1979 30 mk1 stopped engaging. When I moved the drive lever into
the
engage position it seemed to not catch, although it stayed in position. The
unit was clicking away but the wheel was not engaged.
I put a note on the Raymarine tech forum, asking whether
I should take the wheel drive apart. I received a reply, asking “What color is
the wheel drive, Black or Gray?”
I replied that I thought it was black faded to dark gray.
I received
another reply, "There is no adjustment on black wheel drives, and
unfortunately no parts available any longer as well. Sometimes with those
symptoms, changing the belt might help, again there are no parts available but
there is a company…"
I took the
wheel drive apart and found that the cam mechanism was rotating on the shaft
connecting
it to the drive lever Once there were 2 pins which passed through the cam and
the shaft to prevent the cam from free-rotating. They had been worn down or
snapped off. The remains were still lodged in the shaft.
As a
temporary fix, I cut 2 thin brads to length and shoved them through the cam and
shaft, then placed them both back into the drive wheel assembly, jammed the
wheel drive back together and put the drive lever back on.
I haven’t
had a chance yet to try it out because of the winds and rain from Leslie.
I have
contacted CMC Electronics to ask about a replacement drive eccentric assembly. I
was told someone there will call me back.
My apologies if this has been discussed too many times before. Is it a
common problem? What are my chances of finding a replacement assembly?
Thanks
Derek Kennedy
C&C 30 mk 1Ballantyne's Cove, NS
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