Re: [Amel Yacht Owners] Hurth Transmissions freewheeling folding prop

James Alton


  The Foley website refers to this number on the basis of some customers that were replacing or rebuilding their transmissions at about 1000 hours.   

 Foley provided a list of reasons that some people were getting such poor service life such as:

1.  Mating a marginal or undersized transmission to too large of an engine.
2.  Allowing these gears to get low on fluid.  The point being that these gears hold so little that even a small loss is critical)
3.  Saltwater corrosion eating through the case.
4.  Prop wraps.

Basically reasons that with some reasonable care, maintenance and a proper initial installation that can be avoided.  I am getting the impression that good maintenance and coolers are pretty important to the life of these boxes.    It appears that on my boat that Amel oversized the transmission a quite a  bit and I have heard from a number of other Maramu owners that have as many as 10,000 hours on their transmissions.  


SV Sueno
Maramu #220

On Dec 19, 2017, at 8:02 PM, greatketch@... [amelyachtowners] <amelyachtowners@...> wrote:

1000 hours for the life of a Hurth transmission?   No way.  

Something is very wrong with that number.  Properly cared for they should last as long as the engine... maybe 10,000 hours?

Bill Kinney
SM160, Harmonie
Big Pine Key, Florida

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