Leaking from front hub seal 99 sportsman 500 - Polaris ATV Forum
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post #1 of 7 (permalink) Old 09-27-2010, 09:33 AM Thread Starter
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Leaking from front hub seal 99 sportsman 500

Not sure I'm using the right terms. Just bought it a month ago. After first ride, noticed the inside of front right wheel was wet with fluid. It came from the backside of the hub. Spoke with the local dealer mechanic. Told me is was the backside seal and showed me how to replace it. to be clear, its the extremely hard plastic feeling one that has to be tapped in to place to seat, then retained by the tabs on the disc.
Filled it up then turned to the 4 oclock position to drain to appropriate level. It sat in the garage for a week with no residual leaks.
Went for a ride yesterday...wheel was wet again. I made sure I put it in correctly. Will check fluid level tonight to see how much came out. I tightened the nut to the same thread depth as it was previously on and placed kotter pin. Any thoughts on what I may need to re-due correctly or replace instead? Thanks in advance.

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post #2 of 7 (permalink) Old 09-27-2010, 08:40 PM
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Do the handle bars wobble while driving? If so try spinning the hub up front by hand and see if it wobbles. If not jack the rear of the quad up and run it. If the front tire wobbles you found the problem.

I am dealing with this issue on my '02 500 sportsman. The front tire will spin nice and true when jacked up, but when you run the quad with the rears in the air it wobbles. This is because the front axles spin regardless if its in 4x4 or not. I have come to the conclusion that the axle is a bit bent from the CV joint outward. So, as the front axle spins it throws the seal off its mating surface and the oil leaks.

Something to think about.

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post #3 of 7 (permalink) Old 09-27-2010, 09:21 PM
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post #4 of 7 (permalink) Old 09-28-2010, 04:49 AM Thread Starter
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I will give that issue a look. If it does not appear to wobble, I will dissasemble and be sure I put it all back together right. Thinking about how that seal is so solidly in place, hard to believe any amount of flex short of the kind that would be self evident while riding..could allow oil to get past. But I agree it certainly possible. Will let you know what I figure out.

And Bruce, glad to be hear. Been a street bike guy for 20 years. The ATV thing is a new challenge. But lovin every minute of it! Colorado is a great place to do it.

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post #5 of 7 (permalink) Old 09-28-2010, 12:09 PM
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Make sure the front hubs are tightened properly, just because it was put back to where it was before, doesn't mean thats right. Tighten the nut in until you cant go any further by finger, then a little more with a pair of pliers, then back it off a bit and put the cotter pin back in, if the hub is loose, it wont sit squarely on the seal and will therefore leak.

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post #6 of 7 (permalink) Old 09-28-2010, 12:58 PM Thread Starter
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I think you are on to something. The mechanic was quick to tell me not to put the nut on too tight. So I placed it to the same thread depth as before, which was far from bottomed out. I will do as you instructed. That response makes the most sense. Thank you.

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post #7 of 7 (permalink) Old 09-28-2010, 01:56 PM
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yeah,what jon said,,,,,,,,,,,,,,,,,,,,,,,should not be put on dry,,,,,,,,,,just a little grease on the lipseal that spins.tiny bit, only on the edge.

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