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post #1 of 22 (permalink) Old 10-25-2011, 02:20 AM Thread Starter
Minitwins
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squeaky belt drive

my belt squeaks (like squeak, squeak pause then starts again) as it releases from the top of the rear pulley. i think it happens on each revolution of the pulley.

the belt is hard up against the outside edge of the pulley. if i spray a small amount of silicone on that edge the noise disappears until eventually it dries out.

happens every time the dealer adjusts the belt tension. the dealer says the belt must be up against the pulley and definitely not in the middle.

As I'm 250k from the dealer i end up taking the bike to another local bike mechanic who moves the belt a few mm's away from the edge. All okay until i go back to the dealer for service.

can someone tell me what Triumph recommend regarding positioning of the belt on the rear pulley.

Last edited by chrismcg; 10-25-2011 at 02:43 AM.
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post #2 of 22 (permalink) Old 10-25-2011, 02:59 AM
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Like i've said recently, i think there are issues with the design. When the alignment of the wheel is perfectly straight, the pully should be properly adjusted too. But as you noticed it's hard against the edge and starts to shred. I had mine warranted due to this. What i've finally done is align the wheel straight, then back off the left adjuster a few turns. The wheel is no longer lined perfectly, but it's close enough and while the belt still looks hard against the pulley flange, I know pressure is relieved. If i still see a lot of belt dust i go another turn or 2. I think this design will be tweaked in time by triumph till it's better. But for now we just have to make due with little fixes like I did.
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post #3 of 22 (permalink) Old 10-25-2011, 07:52 AM
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Recently had my rear tire changed at the dealer. I asked them specifically to be sure the tension and alignment were set correctly so I would not have the chattering! Got the bike back, and on the first long ride the noise from the belt was so loud it was embarrassing! When I got back home, loosened the rear wheel, tightened both adjuster bolts by a half turn, checked the belt within proper tension according to the service manual and voila! No more chattering... I tend to think the dealers are all overly cautious about setting the belt too tight, rather than getting it set to specification? Sure seems like this is a common occurrence with dealers across the country based on the posts I've seen here.....
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post #4 of 22 (permalink) Old 10-25-2011, 11:16 AM
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I've learned that alignment and tension work together to cause squeaking. In other words, if the alignment is right, the belt can be somewhat tight or loose w/o squeaking. If not, it will be overly sensitive to tension and tend to squeak much easier. If the belt is not adjusted very tight and you have squeak, you can be sure it's way out of alignment. It's amazing how out it can be w/o realizing it unless you have a accurate way to align.

I would bet that in the future (if they haven't already) triumph will make some sort of change, maybe a spacer at the font or rear sprocket or some such thing along those lines, that will cause the belt to gravitate away from the outer flange when the wheel is aligned perfectly. I have put so much time, thought, and energy into getting this right, and at this point i really believe it can't be made right as is. Could be that some bikes can and some can't due to any number of things including possibly engine alignment in the frame due to the frame adjusters that situate the engine in the frame properly.
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post #5 of 22 (permalink) Old 10-25-2011, 12:33 PM
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They need to go to thier belt supplier and get a belt that fits the width of the pulley. Does anyone know the width of the pulley and dimensions of the belt?
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post #6 of 22 (permalink) Old 10-25-2011, 01:09 PM
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I think it's like that on purpose for several reasons. One being that when riding, turns will cause the bet to change it's position on the pulley. If it fit right up to the flanges on both sides the edges would be wearing extremely fast. The problem here is the wheel alignment doesn't jive with pulley alignment, at least on some of the bikes. Ideally the belt would have a tiny gap at the outer flange, but that doesn't happen when the wheel is properly aligned. Instead it is riding hard against the flange causing a lot of wear. You can tell because the wheel gets loaded with belt dust and even shreds of rubber will come off. So like i said, you just turn the left adjuster 2 turns or so so that the axl moves towards the engine a bit. That then buts the wheel out of alignment but takes the pressure off the belt/flange. But i don't feel thats right because if the wheel isn't perfectly aligned then the belt and pulley relationship isn't either. It keeps the belt edge from riding hard against the flange, but it upsets the alignment of the belt teeth to the pulley grooves they ride in. I feel thatss not right either, but if i have to take one of the two i prefer that over the edge of the belt wearing hard against the flange. anyways, thats why i feel it's a flawed system, but probably only because the wheel or pulley needs to go more right. spacers between the pulley and the hug i bet would do the trick. And if so, the triumph would probably eventually rectify it by changing the thickness of the pulley's hub area.

If i'm off here i'd be happy to hear why because i hope i am. But if i am i also hope theres a way to adjust it so this issue doesn't exist somehow, tho i just can't see how.
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post #7 of 22 (permalink) Old 10-25-2011, 05:16 PM
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I told ya Daz,add that third nut on the inside of the left adjuster.Belt tension is set by the right adjuster,alignment is set by the left adjuster.That third nut will align and hold the wheel in place.Then torque the axle nut and recheck everything.If it still isn't 100%,loosen the nut,then tweak it until it is.Then torque it again and recheck it again.Mine has been fine ever since I did that.I believe I have cracked the code as it's been 6000 miles since I changed that rear tire and no squeak,no chirp,no belt noise, period.lol Dave!!!
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post #8 of 22 (permalink) Old 10-25-2011, 06:03 PM
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I've checked it after tightening and down the road a ways and it's holding alignment so thats not it. The only issue with that was when tightening it, but once i started only going from 12:00 on down it stays aligned.
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post #9 of 22 (permalink) Old 10-27-2011, 03:23 AM Thread Starter
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Thanks for the comments, seems to be a common complaint. Will take it to my local bloke and get him to slacken off left tension nut 1-2 turns and see what happens. in mean time will keep using a bit of silicon spray, assuming it will not stuff up the belt.

have another query re side stand switch but will put it on a separate post.
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post #10 of 22 (permalink) Old 10-28-2011, 01:21 PM
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This was a recurring problem. Had it in to the dealer for recall and the belt started squeaking/chirping faintly the night before. Had the dealer adjust it. Picked it up as shop was closing, w/in 5 minutes it was 10x worse. Next day they it was my fault because I hadn't aligned the belt. This was less than 500 km after my 1st warranty service. Suggested I drive it about 30 km to wear off the rough edge. Thought what a load of crap but played their game. Went for 180 km run and it got progressively worse. They adjusted it - went away for about 250 km. They wanted to charge me for re-adjusting it. Apparently they don't get it that a belt shouldn't need to be adjusted every couple of hundred km. Took it back one more time. On a 3 day cruise, it happened again at end of first day. Next day and day after it was gone and hasn't happened again for a couple thousand km (now at 8,700 km). Don't know if it's a break in period for the belt or what but keeping my fingers crossed.
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