The Mysteries of the Autohelm ST 4000

[Alecadi]

I have an ST 4000 (age unknown) on my boat Endeavour 35 , 1984.
That's certainly the only thing that I didn't replace, change, modify, repair since I have own the boat (2 years).
I TOUCH WOOD: it works perfectly

There is an old say: don't fix what is not broken...

But I was looking at the book (original , not a download copy) and it says: there is no maintenance, the ST 4000 is maintenance free
I thought there was a belt that needed to be changed from time to time... No trace of that belt either in the book, no drawings of belt or change of belt..the words doesn't even appear...

so?

The electric motor moving to the wheel is directly connected to the ring? is there a belt or not?

Research on Goggle or CF didn't help" everybody is talking about a belt but I cannot see a picture or drawing explaining where and how...

Somebody knows better?

Alec

[svHyLyte]

Originally Posted by Alecadi

I have an ST 4000 (age unknown) on my boat Endeavour 35 , 1984.
That's certainly the only thing that I didn't replace, change, modify, repair since I have own the boat (2 years).
I TOUCH WOOD: it works perfectly

There is an old say: don't fix what is not broken...

But I was looking at the book (original , not a download copy) and it says: there is no maintenance, the ST 4000 is maintenance free
I thought there was a belt that needed to be changed from time to time... No trace of that belt either in the book, no drawings of belt or change of belt..the words doesn't even appear...

so?

The electric motor moving to the wheel is directly connected to the ring? is there a belt or not?

Research on Goggle or CF didn't help" everybody is talking about a belt but I cannot see a picture or drawing explaining where and how...

Somebody knows better?

Alec

Alec--

There is a drive belt in your wheel assembly. For a better understanding of the drive, click on Autohelm ST4000 and see page 12 of the PDF. It might be wise to save a copy for your files.

FWIW...

FWIW...

[Celestialsailor]

There are 2 different belts. One for the Mk I (black ring)and a different type for the Mk II (gray ring). They're around $30. Hope this helps

[Alecadi]

Originally Posted by svHyLyte

Alec--

There is a drive belt in your wheel assembly. For a better understanding of the drive, click on Autohelm ST4000 and see page 12 of the PDF. It might be wise to save a copy for your files.

FWIW...

FWIW...

Thank you
I got it now
Alec

[Alecadi]

Originally Posted by Celestialsailor

There are 2 different belts. One for the Mk I (black ring)and a different type for the Mk II (gray ring). They're around $30. Hope this helps

I have the black ring
By any chance do you know the ref # for the corresponding belt?
Tks

[speedoo]

Another part that is subject to wear and breakage is the clutch assembly inside the ring that engages and disengages the belt when you flip the lever outside the ring. I don't know the part numbers.

[Celestialsailor]

Same as mine. I believe we have the older MkI version. Here is one on ebay. BELT Raymarine D169 Autohelm ST4000 AutoPilot Raytheon Wheel Pilot | eBay I have seen them slighty cheaper if you google ST 4000 MkI belt. Let us know what you find

[Alecadi]

OK
I'm saved
Thank you guys
I've found the belt on Ebay at 28.99$
Alec

[johnboatcat]

Thought some photos might help some people. This thread helped me get my belt changed out and working better than ever. I cleaned out all the old belt and plastic dust with dish soap and warm water. I found the same belts for as little as $6, but with minimums and shipping it was getting close to the Ebay price so why take a chance for $5. The Ebay belt fit and works perfectly.