Rear Axle Bearing Help/Tips - Polaris Riders
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post #1 of 16 (permalink) Old 04-11-2008, 05:13 PM Thread Starter
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Rear Axle Bearing Help/Tips

This will be my second time replacing the bearings and seals in the rear end of my 03 pred. I know for sure that I messed something up the first time, so I want to make sure its prefect this time. To my knowledge the correct installation is to hand pack the bearings, pump grease in zerk, grease up seals and slide in and tighten axle. Then there are other factors like chain tight/looseness, and axle nuttight/loose. I really just wanted to get a solid thread dedicated to the rear axle bearing installation, and everything that goes along with it. So if anyone has any good info willing to share it would be greatly appreciated.

So what I've got from reading is that the chain should have about an inch and a half freeplay without straping up a tiedown. The axle nut should be 1/4 of a turn backed off after tightning fully...And not to overtightnen the two eccentric bolts. If Im mistaken please correct me, and add anything I've missed. Thanks for reading, RAAB.
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post #2 of 16 (permalink) Old 04-11-2008, 05:32 PM
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You have the principles down. For more specifics (like torque values) refer to the service manual available in the link posted in my signature.

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post #3 of 16 (permalink) Old 04-14-2008, 05:04 PM
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RAAB - I'm with you - I just tore into the axle bearings last week on the 03 that I got as a project bike. I have the service manual - but it doesnt cover changing the bearings, only removing the axle and re-installing.

I've done two other rear bearing changes, both on Yamaha's. The first change didn't last one ride - dealer had to bail me out! The second on my boy's Blaster was a success. In comparison, the Predator is a piece of cake!!

Some things I learned doing the Predator change:

1. IMO, hardest part of the whole deal is getting the clip out from under the axle nut. In my case the axle nut was wasted from previous owner - so i split it with a chisel, then took the axle clip off. May be worth the $15 the new axle nut costs if you're having troubles.
2. The axle nut is left-hand threaded - from reading all the posts, this seems to trip up a lot of people - not a big deal.
3. Work neat, and clean the carrier meticulously inside and out, the whole assembly needs to be seated, and fit together perfectly, if not you're asking for trouble.
4. Make sure you remove the bearing "races" and replace them too.
5. When installing the new races and seals, let them set in the freezer overnight. Heat the end of the carrier evenly with a torch, apply some anti-sieze comound to the carrier and drop the frozen race into place! Tap them all the way around to ensure they are seated properly - tap lightly (the one side of mine almost pushed in by hand - sweet - very little tapping). Do the same with the seals - if you have to tap - tap lightly.
6. I will pack the bearings with the seals in place, install the axle and fill the carrier through the zerk - this way I can still inspect the carrier easily if needed.
7. Make sure the splines are good on the axle, check the sprocket hub, brake hub and wheel hubs - if there's any movement you're in for a new axle and hub(s). In my case the sprocket hub moved on the axle - imo the only good solution is to replace both.
8. Put all axle components back together (new o-rings) and tighten axle nut to specified torque - and since you and I dont have a gigantic torque wrench, I'll do that one by feel, knowing that its just supposed to keep the axle from moving side to side.
9. Tighten chain as described in manual and other posts here and hope for the best!!

good luck with your bearing changes
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post #4 of 16 (permalink) Old 04-18-2008, 02:54 PM Thread Starter
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Well I've got just about everything installed, but it doesnt seem to seat right, the brake disc hub does not make good contact inside the housing. Seems to be that something is taking up too much room in there or something??? Ill post a picture so you can see. This is a picture of the brake hub side with the axle nut tightened. You will see that the part of the hub where the seal is supposed to go around is not really inserting into the housing even when the axle nut is tightened. Any suggestions?
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post #5 of 16 (permalink) Old 04-18-2008, 06:47 PM
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Are you sure your tighting the axle nut the right way. I think, to tighten the axle nut you need to turn it counter clock wise so it pushes on the round clip.

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post #6 of 16 (permalink) Old 04-18-2008, 08:15 PM Thread Starter
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Yea, even tightning the nut so that it pushs on the clip doesnt help pull the axle through or push the brake disc hub into the housing. Taking a second glance i realized there is at least a 1/8 inch gap between the bearings and the seals on both sides. Seems like a lot of play, are the brake and sprocket hubs supposed to squeeze the bearings in? I feel like thats the case, so is it likely that it is just off-centered?, Im going to try to pound the races in a little deeper tomorow and see if that clears up any space. Thanks for the replies.
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post #7 of 16 (permalink) Old 04-21-2008, 10:34 AM
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raab - did you get this figured out? I'm getting my new axle today and hope to install it today - hopefully everything fits!!
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post #8 of 16 (permalink) Old 04-21-2008, 10:29 PM Thread Starter
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preddychickn seems like everything is holding up nice at this point, been out for about 8-10 hours her and seems solid. I will ride All Balls bearings from now on. Best of luck to you and your new axle.
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post #9 of 16 (permalink) Old 04-22-2008, 09:01 AM
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I just got my axle and sprocket shipped in yesterday - got a little hosed from CheapCycleParts.com, they didn't send the axle o-rings and I didn't find out until I got the packing slip - emailed them and hope they make it right or never again...

Anyhow, using the old o-rings everything went pretty much as planned and seemed to fit together nicely - hopefully get the rest of the rear end put on tonight and try it out!!

Where did you find AllBalls bearings for the preddy? does rockymountain have them?? I just got done putting AllBalls in my sons Blaster and its been great so far!
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post #10 of 16 (permalink) Old 04-23-2008, 09:40 PM
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Has anyone had any trouble with the allballs seals not fitting right. When I did mine they would slid back out even after putting some epoxy on the edges. I just went to the dealer and got some OEM seals but I thought that was weird that they did that. And why do they give you two sets?

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