Main Gear Drive Bearing failure - Road Glide Forums
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post #1 of 69 (permalink) Old 03-11-2013, 09:58 AM Thread Starter
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Main Gear Drive Bearing failure

I have been chasing this noise since December and finally figured it out. Due to the weather I have not had alot of riding time to figure out where it was coming from. It started out only being noticeable while rolling under load, but yesterday I could actually hear it sitting still while rolling on the throttle and leaning my head down towards the primary.

The noise started while the bike was being dyno tuned in early December. The tuner came out and said the inner primary bearing was going bad. I nursed the bike home and tore it down and replaced the bearing & race, added the SE Compensator, Hayden chain tensioner, and VP Clutch while I was at it. The inner primary bearing and race were bad, and you could see where the teeth on the starter sprocket was rubbing the inner wall of the primary case. I thought I was good.

After putting it back together and going riding though the noise was still there. Noises are hard to describe, but I thought it could have been pinging, a loose bolt, or the exhaust heat shields rubbing something. My biggest fear was I had done something wrong with my 107" and cam build last fall. The good news is my build is solid.

I wrestled last night with going ahead with a Baker DD7, taking the bike to an Indy, or tackling this myself. I searched out the tools I will need to buy and found some less expensive alternatives to the HD stuff. Being mechanically inclined and adventurous I decided to take a page out of my late Fathers playbook and dive into this myself. My dad was one of those guys that could fix anything even if he had never done it before. Other than the main drive gear bearing installer/puller and a few other odds & ends I have all the tools I need anyway. No point paying someone to do something I think I can handle myself.

If anyone who has done this has any pointers I'm all ears (or eyes I guess). I'll try and document as I go along for a change. I usually don't think to until I'm half done with a project.

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post #2 of 69 (permalink) Old 03-11-2013, 10:08 AM
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I had to have mine replaced at 29,000 due to the POS HD primary chain tensioner keeping the chain too tight all the time. My local stealer said it was the isolated drive system making the noise so I rode it till the noise got worse, then replaced with a Baker tensioner, SE compensator, new main drive bearing and race all done by a indy mechanic here. Good luck with the work-sounds like you have all the tools and know how required.
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post #3 of 69 (permalink) Old 03-11-2013, 10:12 AM
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That should be an interesting build. Does the DD7 have the welded flywheels ? That should be bullet proof when your done.
That one thing that keep me from building mine. Unless you go bottom and top, its just a matter of time with these oem flywheels.

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post #4 of 69 (permalink) Old 03-11-2013, 10:22 AM Thread Starter
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I'm not going to do the Baker DD7 at this point. I didn't word that very well above. I'd like too, but the price is a little steep though probably worth every penny.

I did forget to add that I only have 23,000 miles, have been using Redline tranny fluid since 10K miles and was running Syn3 prior to that. I don't ride my bike real hard, but did while breaking it in after my 107" build.

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post #5 of 69 (permalink) Old 03-11-2013, 10:34 AM
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Quote:
Originally Posted by Hullhorr View Post
I'm not going to do the Baker DD7 at this point. I didn't word that very well above. I'd like too, but the price is a little steep though probably worth every penny.

I did forget to add that I only have 23,000 miles, have been using Redline tranny fluid since 10K miles and was running Syn3 prior to that. I don't ride my bike real hard, but did while breaking it in after my 107" build.
What ya going with?

2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
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post #6 of 69 (permalink) Old 03-11-2013, 11:25 AM Thread Starter
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What ya going with?
My plan is to just replace the main gear bearing and race and the needle bearings inside the main gear. Assuming the main shaft and everything is OK that will be it, but will not know till I get everything apart. I'm undecided on the Cage bearings till I get a look at them, but probably worth replacing since it will be out of the transmission case.

That was one of the appeals to the Baker DD7. It comes with a new cage and bearings that are much beefier than the stock setup. Can you tell I'm still thinking.

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post #7 of 69 (permalink) Old 03-11-2013, 11:33 AM
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Man, that's a big job getting there. No way I'd leave that stock flywheel in there. Unless your not planning on keeping the bike.

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post #8 of 69 (permalink) Old 03-11-2013, 12:19 PM Thread Starter
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Man, that's a big job getting there. No way I'd leave that stock flywheel in there. Unless your not planning on keeping the bike.
I'm going into the trans not the motor.

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post #9 of 69 (permalink) Old 03-11-2013, 12:27 PM
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Let us know how it turns out. What kind of noise did you hear that lead to the bearing failure and were there any other warning signs?


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post #10 of 69 (permalink) Old 03-11-2013, 12:46 PM Thread Starter
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What kind of noise did you hear that lead to the bearing failure and were there any other warning signs?
No other warning signs except the noise. The trans still shifts and operates fine though neutral has been harder to find lately. Glad I figured it out before something catastrophic.

The best way to describe the noise was a loose bolt rattling around. It was most noticeable as I would let off on the throttle after reaching cruising speed. Never heard it under acceleration until yesterday. I believe the actual noise is from the teeth on the sprocket rubbing the inner primary case wall. I've heard others describe a "whining" sound as an indicator, but never noticed that sound, but could be because of the exhaust being loud. The only whining came from me after I figured out what was wrong.

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