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Old 14-06-2012, 03:48   #1
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Wind speed Tacktick Mn-102 change of bearings

My Tacktick Mn-102 stopped giving the correct wind speed as the bearings were broken on the wind "mill" / indicator instrument in the top of the mast.

I contacted the supplier in Norway, who told me that there was no replacement kit for the bearings, and that I had to buy a new unit at 550 USD.

This sounded insane, so I dismanteld the thing, and fixed it myself. Here is a short "how to" for future sailors with the same problem:

- To dismantle the thing, take of the sticker with the serial no. and so on.
- Once done, open the thing with a micro torque tool / screwdriver.

From there itīs rather intuitive.

The bearings (x2) you will need to replace are the following:

604-ZZ, 4 x 12 x 4 Millimeters

I orderd theese from Boca Bearing Company :: Ceramic Bearing Specialists
SMR604C-ZZ #3 (4x12x4) mm

Theese are stainless steel bearings with ceramic balls. Total price for to units came to 40 USD. Photo attached shows the unit dismantled.

Hope this is useful for someone who encounters the same problem.

Andreas
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Old 18-06-2012, 19:13   #2
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Re: Wind speed Tacktick Mn-102 change of bearings

Quote:
Originally Posted by Konsensus View Post
My Tacktick Mn-102 stopped giving the correct wind speed as the bearings were broken on the wind "mill" / indicator instrument in the top of the mast.

I contacted the supplier in Norway, who told me that there was no replacement kit for the bearings, and that I had to buy a new unit at 550 USD.

This sounded insane, so I dismanteld the thing, and fixed it myself. Here is a short "how to" for future sailors with the same problem:

- To dismantle the thing, take of the sticker with the serial no. and so on.
- Once done, open the thing with a micro torque tool / screwdriver.

From there itīs rather intuitive.

The bearings (x2) you will need to replace are the following:

604-ZZ, 4 x 12 x 4 Millimeters

I orderd theese from Boca Bearing Company :: Ceramic Bearing Specialists
SMR604C-ZZ #3 (4x12x4) mm

Theese are stainless steel bearings with ceramic balls. Total price for to units came to 40 USD. Photo attached shows the unit dismantled.

Hope this is useful for someone who encounters the same problem.

Andreas
I know $550 sounds insane but I would happily pay these. My mast unit T120 did break off and is laying somewhere on the bottom of the North Atlantic and my dealer wants $870 for it.
Jochen
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Old 12-01-2013, 16:02   #3
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Re: Wind speed Tacktick Mn-102 change of bearings

Quote:
Originally Posted by Konsensus View Post
My Tacktick Mn-102 stopped giving the correct wind speed as the bearings were broken on the wind "mill" / indicator instrument in the top of the mast.

I contacted the supplier in Norway, who told me that there was no replacement kit for the bearings, and that I had to buy a new unit at 550 USD.

This sounded insane, so I dismanteld the thing, and fixed it myself. Here is a short "how to" for future sailors with the same problem:

- To dismantle the thing, take of the sticker with the serial no. and so on.
- Once done, open the thing with a micro torque tool / screwdriver.

From there itīs rather intuitive.

The bearings (x2) you will need to replace are the following:

604-ZZ, 4 x 12 x 4 Millimeters

I orderd theese from Boca Bearing Company :: Ceramic Bearing Specialists
SMR604C-ZZ #3 (4x12x4) mm

Theese are stainless steel bearings with ceramic balls. Total price for to units came to 40 USD. Photo attached shows the unit dismantled.

Hope this is useful for someone who encounters the same problem.

Andreas
Andreus, First thanks much for your detailed description, picture and link to the bearing company.

I have the exact same tacktick windtransmitter. My anemometer cups suddently stoped turning a couple months ago. I have gotten little help from Raymarine and was starting to wonder if I needed to spend $500 plus and replace the whole unit. But maybe I can do the service you outlined.

I, just this afternoon, climbed the mast and took the unit down. The anemometer cups would hardly turn...I sprayed the axle gap with "PB Blaster" (a penetrating lubricant) and have gotten the cups to turn better. But their momentum is sluggish coming to a stop about a second and a half after I flick them with my finger. I would expect them to continue to spin for about 5 seconds if running smoothly.

A couple of questions:
1. When you put your unit back together do feel fairly confident you sealed it up properly?
2. Since you replaced the 2 bearings I assume you believed them worn...but in hindsight could they have simply been dirty and needed to be cleaned...or couldn't you tell and figured you might as well replace them just to be sure?
3. I only see one bearing in the picture. Am I missing one?

Thanks much!
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Old 28-01-2013, 12:18   #4
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Re: Wind speed Tacktick Mn-102 change of bearings

Just completed changing the bearings in accordance with Andreas's guidance and wanted to confirm that his instructions and picture were exactly correct.

Also wanted to update that the link provided is still good and Boco Bearing Company still carries the necessary replacement bearings.

Also wanted to add that I could not locate a stainless steel retaining clip/ring to replace the one that you need to pry off the shaft of the anemometer. (which one needs to remove in order to get at the bearings). It is in Andreas's picture next to the group of the 4 screws. I attempted to reinstall the old retaining clip but was unable to.

I ultimately obtained a 3 mm e-style stainless steel retaining ring from Boco Tools. The ring however was a fraction of a milimeter to thick to fit into the shaft groove. Using a Dremel tool with grinding wheel I ground the e-style retaining ring so that it would fit into the shaft groove. This substitute ring does not secure the disc (black and white disc in the bottom right hand corner of Andreas's picture) as well as the old retaining clip. But I believe the clip will be adequate...time will tell.

My other concern is wether the inner electronics will remain protected from the elemnets. The seals remained sticky and flexible so I'm optimistic. Also I reapplied the lable to cover the 4 tiny housing screws. The adhesive was still intact and appear to firmy adhere properly. Again time will tell.

If the Tactick fails at some future time I will post an update.

Last comment...This tacktick wind transmitter is 5 years old and I consider it unacceptable that the bearings corroded and failed in such a short period. The unit whose replacement value is in the $600-$700 range, should be better engineered. Apparently Raymarine has re-engineered the unit so that the user can more easily replace the bearings with their $80 kit. Never the less I still find it unacceptable (if I'm guessing correctly) that one need to change the bearings every 5 years. Also I found Raymarine totally unresponsive to my request for help with my older unit.
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Old 13-05-2014, 09:38   #5
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Re: Wind speed Tacktick Mn-102 change of bearings

Hi I am just embarking on the similar repair route - but having a problem removing the small plastic cover over the circlip/bearing assembly. I cant seem to pry it out - any guidance will be welcome
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Old 14-05-2014, 16:08   #6
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Re: Wind speed Tacktick Mn-102 change of bearings

Ok solved the problem but needed to drill 2 small holes the inverted plastic cup in order to get the long plier nose into it,then twist and lift it out
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Old 16-06-2014, 07:15   #7
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Re: Wind speed Tacktick Mn-102 change of bearings

Thanks for the post Andreas, I was scratching my head how to get the thing open until I read your post regarding the sticker which I hadn't noticed.

Dilligafsa, too late now but if you take it slow you can pry that cup out with a flathead, trick is to go slowly to let the glue separate. some heat might help. mine took a few pries around the perimeter. Leavering the screwdriver where the gasket goes around the screws stops you from damaging it.

The Metal retaining clip looks like it can be bent into shape and reused. The glue on the seals is very sticky and should seal well on assembly. I'm thinking a bit of waterproof grease at the exposed bottom end of the shaft should slow the salt spray corroding the bottom bearing.

If anyone needs new batts, the MSU uses 2x Sanyo ML2430 3v MnO2 batts.

I'm just waiting on a new set of bearings from Boco on eBay and I'm back in action
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Old 08-07-2014, 08:01   #8
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Re: Wind speed Tacktick Mn-102 change of bearings

I have a slightly different problem. My MN102 has stopped producing wind direction data. The wind direction pointer spins, so it's not a bearing issue. But it's not sending any data, or rather the direction showing on the cockpit display always points in the same direction.

I'm guessing it's a sensor problem with the masthead unit, but just wondering if anyone has seen this kind of problem.
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Old 25-04-2015, 06:54   #9
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Re: Wind speed Tacktick Mn-102 change of bearings

Terrific post. Thanks to all who contributed... this info is just what I needed. Poor design allows the elements to corrode the lower bearing.
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