[Sharpshooter08]

I have a 2006 trx500fe and I went riding last weekend and then I noticed the right rear axle nut came loose with a cotter pin in it and I know they were torqued down. How can this happen?

 

[GirlsRideToo]

I have a 2006 trx500fe and I went riding last weekend and then I noticed the right rear axle nut came loose with a cotter pin in it and I know they were torqued down. How can this happen?

Did you purchase this TRX500 new or used? Have the hubs, rims or tires been changed? Has axle been replaced?

Any damage to the axle splines or axle nut threads can cause this. Also, axle nuts are not one size fits all so it's possible, if you bought the bike used, it has the wrong nut. If you changed the axle the old castle nut might not be a good fit.
If you have it slightly cross threaded this can cause the nut to jump a thread and work its way off.

Also, check the inside seal on the hub and be sure it is seated correctly.

 

[Sharpshooter08]

I bought it used and it was missing that axle nut when I bought it. I tried blue loctite on it this time. I will keep an eye on it. Thanks

 

[Sharpshooter08]

Also looks like someone put a new hub on the left side

 

[Goober]

I have a 2006 trx500fe and I went riding last weekend and then I noticed the right rear axle nut came loose with a cotter pin in it and I know they were torqued down. How can this happen?

Hmm. Did you mean The nut moved with a cotter pin on the end? You think the entire axle moving outward? To what did you torque it—isn’t it like 100 ft pounds?

 

[Sharpshooter08]

Not sure what happened but yes. It’s 101 foot pounds of torque

 

[fishfiles]

Read you bought it missing the nut , I would go with GRT's thought , when the nut was loose , it wallowed out the hub and most likely damaged the splines on the axle ----if you find that is the case there a couple of shade tree mechanic ways to extend it's life , one is to clean the splines of both the hub and axle and apply some CRC Minute Mend or JBWeld on the splines and tight it up and let it set or weld the hub to the axle ----if you need a new axle and hub anyways

 

[Sharpshooter08]

Thanks for all the help. Culprit is a bad hub

 

[fishfiles]

Thanks for all the help. Culprit is a bad hub

you need to look at the splines of the axle , they must be worn think also

 

[Sharpshooter08]

Axle actually looks ok

 

[Sharpshooter08]

Well I took all the advice and pulled the axle out to find the left axle spacer was missing. I suspect this led to the axle to be to far left and wore out the hubs. Axle splines do look to be in good shape.