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 Post subject: Re: MD180 drive squeak
PostPosted: Wed Oct 03, 2018 2:44 pm 
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mmiller wrote:
I'll ask engineering.

I am guessing the hollows are a molding issue. Not sure it is a defect, but can they compress under load to start the flattening? Or is the lubrication more critical to prevent the wear?

Understand that we cycle tested these things in gritty water for tens of thousands of cycles.


Thanks. I don't think anyone is really being overly critical. Nothing wrong with a little healthy criticism. Finding an easy and speedy solution for the OP is the objective. DIY bearings seems pretty simple.

Testing and Quality is my career. We do our best to find potential risks, but we can't always be exhaustive in our testing. In manufacturing we also get variances without tight quality control. Just the way it goes.

I'd love to see a flat spot on the bearings up close. Curious to know if they are deformed from compression or worn flat.


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 Post subject: Re: MD180 drive squeak
PostPosted: Wed Oct 03, 2018 5:20 pm 
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Location: Oceanside, California
Got a response from Engineering.

Quote:
Delrin. Voids are common in the extrusion process and not a concern.


Image

Image

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Matt Miller
Director of Parts and Accessory Sales
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Hobie Cat USA


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 Post subject: Re: MD180 drive squeak
PostPosted: Wed Oct 03, 2018 5:22 pm 
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Location: Oceanside, California
Thinking of wear... A guy pedaled the length of the Mississippi. The water was fine grit... muddy. He was wearing through stainless parts.

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Matt Miller
Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA


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 Post subject: Re: MD180 drive squeak
PostPosted: Wed Oct 03, 2018 7:35 pm 
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pounce wrote:
I'd love to see a flat spot on the bearings up close. Curious to know if they are deformed from compression or worn flat.


Four of the 15 pieces in that sprocket have flat spots...some worse than the others.

Image

Image


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 Post subject: Re: MD180 drive squeak
PostPosted: Wed Oct 03, 2018 7:38 pm 
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mmiller wrote:
Thinking of wear... A guy pedaled the length of the Mississippi. The water was fine grit... muddy. He was wearing through stainless parts.


If I thought it wouldn't damage the housing, I'd use titanium, niobium or zirconium rod to replace the plastic bearings. The company I work for make these and other exotic metals.


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 Post subject: Re: MD180 drive squeak
PostPosted: Thu Oct 04, 2018 5:33 am 
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trojanchorse wrote:
pounce wrote:
I'd love to see a flat spot on the bearings up close. Curious to know if they are deformed from compression or worn flat.


Four of the 15 pieces in that sprocket have flat spots...some worse than the others.

Image

Image


The images look like they have a problem showing up, at least for me. Maybe they aren't public?


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 Post subject: Re: MD180 drive squeak
PostPosted: Wed Oct 10, 2018 2:59 pm 
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Put it back together (mostly) and it pedals by hand silky smooth. No more squeak. I got frustrated trying to even out the chains so put it down and will finish that part a little later.


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 Post subject: Re: MD180 drive squeak
PostPosted: Fri Oct 12, 2018 5:43 am 
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trojanchorse wrote:
Put it back together (mostly) and it pedals by hand silky smooth. No more squeak. I got frustrated trying to even out the chains so put it down and will finish that part a little later.


Don't leave us hanging. Did you make your own delrin bearings?


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 Post subject: Re: MD180 drive squeak
PostPosted: Fri Oct 12, 2018 3:16 pm 
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pounce wrote:
Don't leave us hanging. Did you make your own delrin bearings?

Sorry. I thought I had posted that. Yes. I used my Dremel to cut all 15 new Acetal copolymer bearings. I cut slightly oversized then sanded the ends flat...100 grit, 150 grit, then 180 grit.

Everything was easy except replacing the chains and idler cable. I'm gonna take another crack at that tonight.

I considered replacing all 30, but I have a feeling that this is going to become routine maintenance and I'll be tearing it apart again next year. I still have over 2' of rod left.

3 oz. of Super Lube is more than enough to do the job.


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 Post subject: Re: MD180 drive squeak
PostPosted: Sun Oct 14, 2018 7:08 pm 
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Joined: Wed Jul 13, 2016 4:49 pm
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trojanchorse wrote:
pounce wrote:
Don't leave us hanging. Did you make your own delrin bearings?

Sorry. I thought I had posted that. Yes. I used my Dremel to cut all 15 new Acetal copolymer bearings. I cut slightly oversized then sanded the ends flat...100 grit, 150 grit, then 180 grit.

Everything was easy except replacing the chains and idler cable. I'm gonna take another crack at that tonight.

I considered replacing all 30, but I have a feeling that this is going to become routine maintenance and I'll be tearing it apart again next year. I still have over 2' of rod left.

3 oz. of Super Lube is more than enough to do the job.


Cool. Glad it worked out easy. Since Hobie isn't offering these at the moment it's really good to know it's not all that difficult to make your own. I am sure others will benefit from your posts.


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