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Old 01-12-2010, 07:10 PM   #1
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Default Xray 808 wheel hub bearing keep failing

The title prettymuch says it all.I will put a brand new set of outer wheel hub bearings in and be lucky to get 1 day of racing in before they begin to get gritty. I am trying to find a solution to this problem because the car handles great and I don't want to get rid of it. Iam running the plastic bearing carriers.
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Old 01-12-2010, 07:22 PM   #2
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you can say that again. Oh wait
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Old 01-12-2010, 07:26 PM   #3
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Ahaha
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Old 01-12-2010, 07:36 PM   #4
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dude then your doing something wrong. what bearings are you using??
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Old 01-12-2010, 07:39 PM   #5
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I'm pretty sure I've been doing it right I don't know how you can put a bearing into a hub wrong. I'm running avid right now but have tried answer bearings too. I should of asked you when you were down at mills this past weekend but I was freezing my butt off. If I can't figure it out il talk to you at Dayton
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Old 01-12-2010, 07:45 PM   #6
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what size are they ?

losi's 8x14x4 on the wheels are a little weak for the job and lot of guys mod the hubs to take a larger 8x16x5 bearing which are 10X more durable.
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Old 01-12-2010, 07:51 PM   #7
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How do they mod for the larger bearing?
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Old 01-12-2010, 07:59 PM   #8
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Quote:
Originally Posted by btownbasser View Post
How do they mod for the larger bearing?


A skilled machinist can do it no problem.
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Old 01-12-2010, 08:23 PM   #9
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Perhaps an identical thread will solve the problem?
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Old 01-12-2010, 08:49 PM   #10
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Are you using the black rubber shielded bearings? the yellow ones havea seal that has gaps in it, and they do tend to foul up quickly for that size. The larger 19mm bearings only come in the yellow and those are fine, but I use the black rubber shields for the smaller bearing, they last longer. Another thing, check the play in the axel movement inside the bearings, if the axel slides in and out they could be damaging them not getting dirty, I place one small shim on the axle before the wheel hub to fix that, you may not need shims on every wheel, but when there is play the shim will help. Kyosho sells a bag of three thicknesses of shim that fits that spot. Put the middle size on it and tighten the set screw down with a wheel on it and rotate it to check to see if it's too tight though, if it is too tight go with the thinnest one. I've found the newer buggies have ighter tolerences than the older cars and people tend to just build the car and forget to check these things. Take your time and add a shim if needed. I also use one on the center diff gears in the bulkhead inside the bearing spacer too, it helps. I also use one thin shim on the upper side of the servo saver on the servo saver side. I put it on the shaft on top after it's together mostly before the bearing goes in. This raises the bearing just a bit and elliminates the up and down play and makes the steering more precise, once again don't overdo it. The tolerances are tighter these days so thinner shims are needed...
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Old 01-13-2010, 04:40 AM   #11
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Have you checked to see of the bearings are filled with grease, its surprising how many come with no enough or none at all.
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Old 01-13-2010, 10:03 AM   #12
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Yes I have checked the bearings for grease and they are packed with grease. It just seems the bearings don't fit snug in hubs and the bearing wobbles around inside.
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Old 01-13-2010, 03:38 PM   #13
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Default Because there is slop in

the axle, try the shims.....
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