Third time I have lost front sprocket nut - Yamaha ATV Forum
 
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post #1 of 14 Old 05-28-2005, 11:27 PM Thread Starter
 
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Third time I have lost front sprocket nut

Does anyone else have a problem with front sprocket nut coming off? I have bought 2 new nuts and washers already and today I lost another one. THIS IS FRUSTRATING! I am installing everything properly and bending the tabs over the flats of the nut. Had to ride back to the truck on the road with a hose clamp wrapped on the threaded shaft. Is it possible I could have a bent swingarm? Any comments or similar experiences?
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post #2 of 14 Old 05-28-2005, 11:46 PM
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Re: Third time I have lost front sprocket nut

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Originally Posted by mccstevie
Does anyone else have a problem with front sprocket nut coming off? I have bought 2 new nuts and washers already and today I lost another one. THIS IS FRUSTRATING! I am installing everything properly and bending the tabs over the flats of the nut. Had to ride back to the truck on the road with a hose clamp wrapped on the threaded shaft. Is it possible I could have a bent swingarm? Any comments or similar experiences?
Try some loctite....

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post #3 of 14 Old 05-28-2005, 11:56 PM
 
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How much torque are you using? Are the locking tabs actually breaking off?
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post #4 of 14 Old 05-28-2005, 11:57 PM
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Eyeball your swingarm to check for a bend. And dam you must land crazy jumps awkward to do that. Of course max strenght loctite is a must on non-maintenance applications or on all bolts like I do. Put the bit*h in gear or park brake it and torque the bolt.

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post #5 of 14 Old 05-29-2005, 01:30 AM
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I have seen it happen to a retainer than had been reused several times.
Red Loctite and a new retainer with correct tourque ( real tight ) should hold.

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post #6 of 14 Old 05-29-2005, 01:52 PM Thread Starter
 
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Third time I have lost front sprocket nut

I have never recovered the nut or lockwasher when this has happened. I do not know if the tabs are breaking off, though I believe that is what is happening. This last one was torqued to specs, and both the lockwasher and nut were new, it lasted less than 5 or 6 hours riding.
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post #7 of 14 Old 05-29-2005, 11:31 PM
 
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What torque spec did you use? And you are bending the tabs flat against the nut after? How do your sprockets look? Any funny wear patterns or broken teeth? If it's not your assembly process, something is terribly wrong with your Raptor.
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post #8 of 14 Old 05-30-2005, 08:23 PM Thread Starter
 
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Third time I have lost front sprocket nut

The book calls for 110 ft lbs on the primary drive gear. I was going to 100 ft lbs. but was afraid of breaking something in the transmission. I did bend both tabs of the washer over the nut flats tight. The front sprocket is showing abnormal wear on the inside like the chain is out of alignment. The swingarm has such a strange bend to it when new it is hard to pick out an obvious bend just by looking at it.
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post #9 of 14 Old 05-30-2005, 08:31 PM
 
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You should be able to lay a straight edge on both the front and rear sprockets. If the chain takes off at an angle as soon as it leaves the sprocket, there is your misalignment. If your front sprocket is wearing on the inside, that means the chain is being pulled toward the rear tire to ride the rear sprocket.

I've never heard of the front nut coming loose like that, let us know what you find as you troubleshoot.
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post #10 of 14 Old 05-30-2005, 10:39 PM
 
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mine did two in a very short time repalced the oil seal this weekend along with the nut last time i got the nut when it fell off and it was stripped i have prolly ridden 35 good miles one this one since yesterday and i keep checking it i used some blue locktight this time it aint moved.
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post #11 of 14 Old 05-30-2005, 11:34 PM
 
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Woah... the manual calls for 110 ft/lbs. on the nut holding the countershaft sprocket on? The service manual from Magnoila Trasctor only lists the torque as 50 ft/lbs. I just swapped a 12t front on and only torqued the nut to 50 ft/lbs. Should I go back and take it to 110 ft/lbs.?
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post #12 of 14 Old 05-31-2005, 04:16 PM
 
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It is 50 ft lbs.

I lost mine once. Did everything right, torqued it, bent the tabs over... The worst part was I had the stock cover on, the sprocket slid out onto the threads on the shaft and tore them off to where I had no chance of getting the nut back on.
I drilled the end of the shaft and tapped it, put a spacer in to hold the sprocket in, Lok-Tited a 3/8" grade 8 bolt in the end of the shaft. Rode it this way for over a year without loosing another sprocket. I did have trouble with loosing some oil at the seal, I assumed that I didn't get my bolt tapped in dead center and this would wear out the seal.
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post #13 of 14 Old 05-31-2005, 10:18 PM Thread Starter
 
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Third time I have lost front sprocket nut

Pleave forgive me for the misprint on the drive sprocket torque values. I misread what was in the book, it is 50ft-lbs. After tearing into the Raptor tonight I have found the reason for my pains. I bought a mint condition swingarm off e-bay and compared it to mine. The rear of the swingarm was bent to the left by a good 1/2 inch. Now it makes sense as to why my sprockets are wearing on the inside and my rear axle bearings have such short life spans. It was bent starting at the pivot end but it was hard to detect by sight. Thanks for all your helpful input.
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post #14 of 14 Old 06-01-2005, 01:16 AM
 
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i havent had any problem with hand tight. how are the splines look. try your stock swing arm again and see if you have the same problem.
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