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Old 23-03-2020, 02:19   #1
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Location: Adelaide, South Australia
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Hydrovane drive unit slipping on shaft

Hi all,

The following is ďasking for a friendĒ so my apologies for the slight lack of clarity.

I helped a friend install a new Hydrovane on his boat a few months back. It works well, however since the very first use he has experienced an issue where the drive unit slowly slips on the shaft. Over time, with the drive unit and tiller locked in the straight ahead position, the rudder ends up pointing more and more to port.

We installed it a little offset to the starboard side of the boat (A Duncanson 37 or something like it from memory) to clear the stern ladder.

We were very careful about vertical alignment in both the fore and aft and port and starboard axis.

He has contacted Hydrovane about the problem but has had little in the way of advice so far. I suggested I should post here as there are many users of the Hydrovane on this site who may have some advice.

Any ideas?

Matt
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Old 23-03-2020, 02:40   #2
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Re: Hydrovane drive unit slipping on shaft

Wow! Hard to imagine Hydrovane not having something helpful.


I can picture the problem and the parts I would think might be contributing.


I will ask if you have loosened the split yoke & straightened it out? If you do that and make a mark (maybe scratch) them both to show where they line up when straight ahead, then watch for any shift, that would confirm that the yoke/shaft grip isn't enough and maybe give Hydrovane helpful information.
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Old 23-03-2020, 02:43   #3
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Re: Hydrovane drive unit slipping on shaft

Quote:
Originally Posted by Minggat View Post
Wow! Hard to imagine Hydrovane not having something helpful.


I can picture the problem and the parts I would think might be contributing.


I will ask if you have loosened the split yoke & straightened it out? If you do that and make a mark (maybe scratch) them both to show where they line up when straight ahead, then watch for any shift, that would confirm that the yoke/shaft grip isn't enough and maybe give Hydrovane helpful information.


Iíll relay that. I confess I canít picture what you describe but I just fitted the mounting brackets, I didnít help with fitting the drive unit. Iím sure it will make sense to him.
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