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Old 05-16-2015, 07:15 PM   #1 (permalink)
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Default KDE one way bearing stiff

I installed a KDE Direct one way bearing hub upgrade on my new Trex 700l build yesterday and I find it to be very stiff. It adds a lot of drag; I can feel it when I try to free spin the head. Is this normal? Will it break in and loosen up after a couple of flights?
The main shaft slides thru the one way bearing with about the same force as the align hub.
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Old 05-16-2015, 10:08 PM   #2 (permalink)
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Some times it takes few flights to loosen up. Also make sure there's no binding in other places - e.g. too many washers on the main shaft..
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Old 05-17-2015, 02:14 PM   #3 (permalink)
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What are you using oil or grease? Patrick told me to wipe the grease if any, out and just use a couple of drops of tri flow. I would give it a few flights, maybe 5-10, if it doesn't loosen up, just email them and I'm sure they'll be happy to help you out.
Are you using the the spacer that goes in the OWB housing?

https://cdn.shopify.com/s/files/1/04...agram.pdf?7504
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Old 05-17-2015, 02:55 PM   #4 (permalink)
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I am using the spacer inside the one way bearing housing. I also have grease in the bearing. i will clean the grease out and add some tri flow. the bearings are not binding, just tight enough to cause some extra resistance. I pulled the hub apart a second time to make sure everything was installed properly.
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Old 05-17-2015, 04:39 PM   #5 (permalink)
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Ok, if you need to, you can always send me a PM.
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Old 05-17-2015, 08:43 PM   #6 (permalink)
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Well I removed the bearing, cleaned of the grease and applied tri flow. The bearing is still way to stiff. I replaced the KDE housing with the stock Align housing and everything works great. Spooled it up on the bench and my NEO’s vibe levels went down by 120 points. With the Align housing, the head free spins like it should.
Going to stay with the stock part.
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Old 05-17-2015, 09:31 PM   #7 (permalink)
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I would ask KDE for a replacement anyway, it would be good to have on hand, sometimes the stock ones can start slipping. But there is also a fix for the stock one if it starts slipping and you decide to stay with it.
Either way, have fun!
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Old 05-18-2015, 05:09 AM   #8 (permalink)
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i have the exact same problem, first, you have to check that the radial bearing (15 X 21X 4mm)in the KDE hub is smooth, if its not, change it...but....if you change it and a new bearing is notchy, then the bearing groove in the KDE hub is too tight and you have to use a dremel to sand it down, so the bearing goes in not to tight. When reassembling, always make sure you screw up the halves together not tight, run the OWB shaft and turn it in the OWB to ensure it seats properly, it should turn smooth, then you tighten up.
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Old 05-18-2015, 06:14 AM   #9 (permalink)
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I will ask KDE to take a look at the part. I think you are right, the radial bearings are not lining up correctly. I can slide the main shaft sleeve thru the housing easily before I tighten the bolts on the housing. Once I try to tighten the bolts, the sleeve starts to bind. and yes, I do tighten them in a cross pattern.
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Old 05-18-2015, 11:17 AM   #10 (permalink)
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I had the same issue with my two hubs, the key is to not tighten the ring down too much..... I tightened them, but didn't really torque them like I usually do and they both have been fine for 100's of flights now.
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Old 05-18-2015, 08:22 PM   #11 (permalink)
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keep spinning the sleeve as you tighten, and do as fastone says, and dont over tighten
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Old 05-19-2015, 09:05 PM   #12 (permalink)
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Sent KDE Direct and Email explaining my problem and the are sending me a replacement one way hub.

thanks KDE
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Old 05-20-2015, 07:19 AM   #13 (permalink)
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Quote:
Originally Posted by whittb View Post
Sent KDE Direct and Email explaining my problem and the are sending me a replacement one way hub.

thanks KDE
don't be surprised if it is stiff as well, both of mine were....
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Old 05-21-2015, 02:55 PM   #14 (permalink)
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did you assemble with or without the thin spacer washer?

I just put one of the KDE hubs on my T700N Gasser conversion but it is the same part as my 700L. Align puts their hub together with a thin spacer washer. I found that with the spacer installed in the KDE hub, the sprag is up too high and binds when you put the cover on. I took the spacer out and it was fine. I emailed KDE about this issue since their diagram shows the spacer as "optional". They told me it should not be needed.

Check for binding with and without the cover on. If it gets worse with the cover, your sprag is hitting the cover.
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Old 05-24-2015, 06:59 PM   #15 (permalink)
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Assuming that its assembled correctly, every OWB I've ever had was tight at first... even with some clicking.

After a few flights, they are smooth and quiet.
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Old 05-26-2015, 02:59 PM   #16 (permalink)
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got my replacement part in Friday. but I have been busy flying, So I did not install it yet. managed to get 4 flights in on the 700L. fly's very nice with the new NEO.
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Old 07-21-2017, 05:47 AM   #17 (permalink)
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Having the same issue with my KDE hub on my 700N DFC.. going to remove the spacer under the OWB and see how it works out..should fix it, as stated before the OWB sits too high with the spacer.
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