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  • 13 Post By petrolhead_chn
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Thread: ---DIY for changing sprocket bearing---

  1. #1
    Rusted petrolhead_chn's Avatar
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    Default ---DIY for changing sprocket bearing---

    Vehicle:
    Bajaj Avenger 200cc (should be applicable to most motorcycles)

    Purpose:
    Grinding sensation felt on the left footpeg either while driving or while braking or both.

    Symptoms:
    There are many symptoms that could be consolidated.
    Rotate the rear wheel forward and very curiously put your ears near the sprocket and a finger on the saree guard. If you are able to hear too much 'khat-khat' sound and too much jitter on the saree guard, then it is most likely that the sprocket bearing needs replacement.

    If the same issue persists even after chaning the sprocket bearing, you may need to replace the other two wheel bearings as well. I decided to change the sprocket bearing first and check and then do the other bearings.

    Part number:
    39268620 - Rs. 60
    39268720 - Rs. 99
    39224020 - Rs. 80


    Tools required:
    * Ring spanners of sizes
    28 - rear wheel nut
    14 - brake hub nut
    10 - Gear lever bolt
    * Plier
    * Screw driver
    * New sprocket bearing
    * Industrial grade grease (I used SKF)
    * Diesel/Petrol/Kerosene for cleaning purposes
    * Rags
    * First aid kit
    * A bucket of water

    Procedure:
    1. Park the vehicle on a platform such that the distance below rear wheel and ground is about 4-5inches. This will help you pull out the wheel easily.

    2. Using the 14" ring spanner remove the nut that locks rear wheel brake hub.

    3. Using the 28" ring spanner remove the rear wheel nut on axle.

    4. Use the screw driver to gently tap the axle out to the end. As you do this the spacer, brake hub will be loose enough.

    5. Once the axle is completely out, you can remove the rear wheel, rubber damper and brake hub.

    6. Keep the rag just below the chain to avoid the chain getting in contact with mud/dust.

    7. Unhook the sprocket from the chain. This is the piece that we are going to work on.

    8. Remove the dust seal from the sprocket.

    9. Use the 2 spacers to place them on the old bearing on sprocket and tap them with the plier such that the old bearing pops out. (Note: There should be a bearing puller or something for this. But I just used these as I decided to be gentle. I did not even use the hammer unlike what the mechs use.)

    10. Once the old bearing is out, you can keep it aside for observation purposes later ;-)

    11. Clean the sprocket with diesel/kerosene/petrol and wipe the old grease completely. If you used used fuel to clean the bearing area, wipe it and allow to dry.

    12. Meanwhile, grease the new bearing completely. Most bearings come with packing on both the end. Just in case if one end is not packed, put them on the inner side of sprocket.

    13. Grease the bearing area on sprocket generously. You could also use the remaining grease on the axle.

    14. Place the new bearing on top and do not start hammering it.

    15. Use the pliers and tap gently on four sides to mark its seating. Then place the old bearing on top of new bearing and start tapping with the plier on the sides while rotating the sprocket. Do not tap a particular area for too long. you need to tap it on all sides simultaneously.

    16. When the old bearing is just about to get in take it out and use the spacer to tap the new bearing in completely.

    17. Place the dust seal and ensure to clean it completely. It is better off if we could use a new seal.

    18. The bearing replacement job is done. Put the sprocket on the axle and rotate the sprocket. It should rotate freely which ensure the job is well done. No khat khat or any kind of sounds.

    19. Ensure that the chain adjusters, rubber damper and spacers are in place before reassembling.

    20. Start with the axle head, spacer on dust seal, sprocket, spacer, wheel, brake hub, spacer and lock nut. It is tricky to put back things in order as you need to push the mechanicals back and forth to allow the axle come out to the other end.

    20. Before locking the nut, you may want to clean and lube the chain. Adjust the chain for correct slack. Take help of guide marks on chain adjusters. Once done lock the nut.

    Results:
    Time to check the outcome of the job. Rotate the wheel forward and very curiously put your ears near the sprocket and a finger on the saree guard. If you are able to hear too much 'khat-khat' sound and too much jitter on the saree guard, then it is time to find a concrete wall nearby to bang the head or pick up the 28" spanner for the same purpose ;-)

    I was thinking I would do this. Fortunately, the heavy and rough 'khat khat' noise totally vanished and the saree guard was found to be with no jitters unlike earlier. Soon after the replacement I rode the bike on various speeds and tested the brakes and no grinding sensation was felt. However I am keeing my fingers crossed the results are under observations.

    ---DISCLAIMER---

    I am a fond lover of doable DIY projects and I take utmost care and caution in doing this with all risks vested upon me. While the outcome may vary on each bike, I strongly recommend you to completely understand your bike and then go ahead with similar DIYs. Though I would be glad to answer any of your questions I am not responsible for any kind of outcome of such DIY. Please take help and clarify before gettings your hands greasy!!!

    Hope you all liked it. Feel free to PM for any questions!
    Thank you for reading!!!

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    My DIY(s) - Sprocket bearing change | Paint job | Custom speedo dial

    Getting angry at somebody is the same as getting angry with a bike that just won't go. You should stop and start thinking.
    A good mechanic will let you watch even without charging you for it. | Riding faster than everyone else only guarantees youll ride alone.

    It is funny to know that we've been imitated and copied so well
    and surprising when we notice our mistakes are copied as well.

  2. #2
    Moderator The Monk's Avatar
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    Default Re: ---DIY for changing sprocket bearing---

    DIY Approved

    Wow. That is way too complicated for me to even attempt
    Biking is not about what you have between your legs, its all about how well you use it!!!!!!!

    Give your details here if you want to help your fellow xBhpian stranded in your city

    Touring Blog: Cycling in Mongolia!

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    Default Re: ---DIY for changing sprocket bearing---

    Thank you verymuch petrolhead,
    I did changed only one rear sprocket bearing yesterday and found that the bearing has lost all its smoothness it was SKF bearing.after changing that one still some ghut ghut sound was coming near from the engine..so i removed the front sprocket covering (for which it is required to takeout the gear lever mechanism and requires a T spanner ) and i saw the front sprocket is shaking.. is it normal. if not i have no idea to remove or tighten it .can anyone help..

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    Default Re: ---DIY for changing sprocket bearing---

    It seems the drive sprocket have some play as per the Bajaj Ass, could you check your bikes drive sprocket play while you are oiling the chain Petrolhead.

  5. #5
    Deflect & Punch SparKot's Avatar
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    Default Re: ---DIY for changing sprocket bearing---

    You can check if a bearing is off by simply feeling the inner racer with finger while rotating it. It often gives you rough feeling when a bearing is off.
    There is no honest path to prosperity - KoKa
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    Default Re: ---DIY for changing sprocket bearing---

    Quote Originally Posted by cruiserboy View Post
    Thank you verymuch petrolhead,
    I did changed only one rear sprocket bearing yesterday and found that the bearing has lost all its smoothness it was SKF bearing.after changing that one still some ghut ghut sound was coming near from the engine..so i removed the front sprocket covering (for which it is required to takeout the gear lever mechanism and requires a T spanner ) and i saw the front sprocket is shaking.. is it normal. if not i have no idea to remove or tighten it .can anyone help..
    I too had the same doubt when the front sprocket of my unicorn has a play. i saw that when i opened the cover(that covers front sprocket) for chain cleaning. Had an opportunity to check the front sprocket of Honda shine and that too had the play. Then i realized that a play in front sprocket is common in most of the bikes. You confirmed it.
    Last edited by visco; 07-11-2014 at 06:05 PM.
    cruiserboy likes this.

  7. #7
    Deflect & Punch SparKot's Avatar
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    Default Re: ---DIY for changing sprocket bearing---

    Quote Originally Posted by visco View Post
    I too had the dame doubt when the front sproket of my unicorn has a play. i saw that when i opened the cover(that covers front sproket) for chain cleaning. Had an opportunity to check the front sproket of Honda shine and that too had the play. Then i realised that a play in front sproket is common in most of the bikes. You confirmed it.
    Add GS150R too to that list of "Play in Front Sprocket". Apparently it's there by design, could dig deeper than that [still digging]. Apparently it's there in super-bikes, dirt-bikes etc.

    Play in front sprocket - Honda Motorcycles - FireBlades.org

    Two types of play, viz Axial & Radial.

    1. Axial Play : lateral movement/play along the axle which is by design & can be ignored.
    2. Radial Play : rotatory movement/play along the drive chain is a concern.
    cruiserboy likes this.
    There is no honest path to prosperity - KoKa
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  8. #8
    D.I.Y
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    Default Re: ---DIY for changing sprocket bearing---

    Quote Originally Posted by SparKot View Post
    Add GS150R too to that list of "Play in Front Sprocket". Apparently it's there by design, could dig deeper than that [still digging]. Apparently it's there in super-bikes, dirt-bikes etc.

    Play in front sprocket - Honda Motorcycles - FireBlades.org

    Two types of play, viz Axial & Radial.

    1. Axial Play : lateral movement/play along the axle which is by design & can be ignored.
    2. Radial Play : rotatory movement/play along the drive chain is a concern.
    The reason is simple- The play in sprocket and chain is there so that it can account for lateral movement of swing arm and rear suspension travel respectively.

  9. #9
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    Default Re: ---DIY for changing sprocket bearing---

    Quote Originally Posted by visco View Post
    I too had the dame doubt when the front sproket of my unicorn has a play. i saw that when i opened the cover(that covers front sproket) for chain cleaning. Had an opportunity to check the front sproket of Honda shine and that too had the play. Then i realised that a play in front sproket is common in most of the bikes. You confirmed it.
    I discussed this with one mechanic, and he said the play has been increased in the newer bajaj bikes..may be we could make the ride smoother by using a washer.

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