Posts by MaineSS

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    Update: After driving from Maine to the SSITP 2019 (Pocono's) over 1100 miles round trip everything is still quiet! I will grease the needle bearing again when I do my Fall oil change.

    where in Maine are you?

    I was thinking of riding down to this also, I'm up in Millinocket,


    Dave

    Dave, Kittery Point, we were just up near you last weekend visiting family in Lincoln.

    Anyways I'm leaving early Thursday AM with or without my sling as my coolant tank started to leak this week! I'm off to my local dealership this morning to see if by chance he has one in stock;) Hope I will be attending with my sling!

    Thanks, my hope is that this info and the pictures can help other Slingshot owners having the same axle bearing issues?


    Update: I just returned after a test drive, all is quiet now!

    I did have to readjust the drive belt tension and realign the belt before the test drive.

    FYI, I'm keeping my belt tension set at 7/8" COLD now as IMO the factory specification is too tight at .625".

    First off let me say this is MY attempt to extend the life of the axle bearings, this is not a fix for bad engineering by Polaris and is not a simple fix-all solution for dealerships but I do hope Polaris is watching!

    Ok, my parts are finally back from the 2nd machine shop! My first attempt was not a success because I didn't know how hard the needle bearing bushing was.

    The first machine shop tried to cut a keyway and estimated the Rockwell hardness was 60 or above they recommended another machining process called EDM electrical discharge machining.

    Our axle tubes are case hardened at each end of the bearing surfaces and can be milled.

    I will post more pictures soon and write a follow up report.

    Test fitting bushing..jpeg

    Here are additional pictures of the two parts I had keyed, this ensures no rotation between the needle bearing bushing and the axle. I feel that when lack of grease is at the OEM needle bearing, it starts a friction that rotates the bushing which causes more heat, wear, and bearing noise. Note the grease starting to be pumped out between the needle bearing and the new bushing.

    Between adding a grease fitting that can be greased and locking the bushing I should

    greatly reduce the chances of heat, wear, and bearing failure.

    bushing greased via greased fitting..jpeg  Test fitting bushing..jpeg Sprocket double nuts installed..jpeg


    New bushing with keyway cut..jpeg Keyway length..jpeg Keyway width..jpeg

    First off let me say this is MY attempt to extend the life of the axle bearings, this is not a fix for bad engineering by Polaris and is not a simple fix-all solution for dealerships but I do hope Polaris is watching!

    Ok, my parts are finally back from the 2nd machine shop! My first attempt was not a success because I didn't know how hard the needle bearing bushing was.

    The first machine shop tried to cut a keyway and estimated the Rockwell hardness was 60 or above they recommended another machining process called EDM electrical discharge machining.

    Our axle tubes are case hardened at each end of the bearing surfaces and can be milled.

    I will post more pictures soon and write a follow up report.

    Test fitting bushing..jpeg

    Here are additional pictures of the two parts I had keyed, this ensures no rotation between the needle bearing bushing and the axle. I feel that when lack of grease is at the OEM needle bearing, it starts a friction that rotates the bushing which causes more heat, wear, and bearing noise. Note the grease starting to be pumped out between the needle bearing and the new bushing. bushing greased via greased fitting..jpeg Between adding a grease fitting that can be greased and locking the bushing I should Test fitting bushing..jpeg Sprocket double nuts installed..jpeg greatly reduce the chances of heat, wear, and bearing failure.


    New bushing with keyway cut..jpeg Keyway length..jpeg Keyway width..jpeg

    "What are the holes in the bottom of the swingarm? The speed sensor is on the other end isn't it?"


    There are two holes at the bottom of the swingarm on the drivers side inboard of the roller bearing. One is for the sensor the other is for the sensor bolt that was drilled through at the factory, not a blind hole like it should have been IMO.

    This is why we need a grease fitting, more to follow:


    Well it's my turn for the rear axle bearing failure, I was in Maggie Valley last month attending SSITS 2019 when that awful creaking noise started under 5 MPH, every rotation of the rear tire:arghh:.

    So when I got home I cleaned the drive belt and loosened the drive belt tension...with no success, I jacked the rear tire up and rotated the wheel first with the belt installed then I removed the belt to confirm the bearing noise every 360 degrees of rotation. I could hear the bearings click, click, clunk!!

    I just turned 5K miles on my 2016.5 Slingshot and don't want to waste the entire Summer driving season at my local dealership so I dove in my garage removing the old bearings and ordered all three replacements from Polaris.

    By now I have searched all of the related threads and read hundreds of posts about these bearings and their issues and after I inspected my failed bearings I have formed my own opinion of the failure and what I can do to help extend the life of both bearings.

    First I will post some of the damaged bearing pictures, IMO the reasons they both failed were belt tension (too tight) and heat from lack of grease.

    This in-turn this caused the needle bearing bushing to rotate against the OD of the axle tube which causes more heat, melts grease in both bearings, and loosens the clamping force of the double nuts, (because of the aluminum spacer and bearing expansion then contraction, not because of the nuts loosening).

    look closely at the roller bearing and the swingarm bearing bore you can see melted grease then look at the needle bearing bushing, it has spun free around the axle tube, this bushing should always stay clamped tight from the 250 lb.- ft. torque from the double nuts.

    I will post more pictures hopefully this week when my OEM parts are back from my local machine shop.




    file-35.jpeg file-36.jpeg file-37.jpeg file-31.jpeg file-32.jpeg

    Drove to Tallahassee, Florida from Maine last week! Loaded my Slingshot on my trailer today and found one of my trailer tires was flat, got the spare swapped and the tire plugged.
    Leaving for Maggie early Monday should be rolling in after lunch. Can't wait!