Max Power bow thruster troubleshooting

yodave

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Our bow thruster started making a harsh grating noise (like a handful of memory sticks in a blender) at the weekend. A knowledgeable friend reckoned that the bearings have 'gone', so I spoke to Peachment the UK distributor for Max Power. The helpful chap informed me that there are no bearings inside the "sea leg", and that its a sealed unit. As replacing the the sea leg would cost me around £300 to try, his advice was to take the electric motor off, and try to see if I could move the propellor manually via the sea leg.

We have a bilge keel yacht, and so this is something that I can do when the tide is out, however... (and here's the number one consideration)... ...I need to ensure that I don't loosen the sea leg by mistake, as this would clearly allow water ingress.

I've been on the Max Power website and haven't been able to track down a manual (our model is the 35-12v). The problem I have is that I'm not familiar with the product, so while I can take an educated guess at what goes where, I'd much rather be certain. Does anyone out there have any diagramatical info, or specialised knowledge to give me a bit of reassurance? If you look at the picture below, does anyone know if the steel plate is the base for the motor, which can be removed without any danger of loosening the sealeg and ultimately revealing a through-the-hull hole?

I reckon that under the steel plate will be the sealeg with the through the hull fitting, and so it should be okay to remove the plate. I'm going to have a closer look at this and may take steps tomorrow afternoon at low tide. Thanks in advance for any pointers!

WP_20130511_008.jpg

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philip_stevens

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I would think it is a similar set-up to the Vetus bow thruster I have in our boat.

Take the top off the motor, and you will probably find two bolt heads 21A (slotted, star or hex) and is so, this is what holds the motor to the tunnel plate. The leg is probably bolted through the tunnel plate by another two bolts 17.

If you look at this Vetus diagram, it "may" give you a better idea of how it is fitted.

View attachment 43460

On the pdf manual diagram of the Max Power BT, bolts number 2 look as though they hold the motor to part number 8 - the tunnel plate.

http://www.max-power.com/ajax/download.php?documents[]=1
 
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yodave

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Hello Philip,

Thank you very much, you're a star. I knew there must have been a manual of some sort out there, but I couldn't find it. As you point out, according to the diagram on page 13, it looks as though I can remove everything on top of the steel plate, and reveal the sealeg underneath, which should still be fully watertight. That's what I wanted to know, so with a bit of luck I'll be able to carry out a simple diagnostic later today ...which will hopefully give me an indication of where the problem lies.

Many thanks once again; I really appreciate your help : )
 
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