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Drive Lugs Torn Off, Again! Really baffled by this one!

#1 User is offline   groulxs Icon

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Posted 13 April 2012 - 10:48 AM

Hi Folks,

Hope someone here can help shed some light on this. Here's my situation:
Was taking studs out of my 570 yesterday, and noticed that one row (out of 4) of drive lugs in the track is badly damaged. I'm not sure how this could happen, since the drive sprocket should be putting equal pressure on all 4 rows of drive lugs.
The track is OEM. Same thing happened with my Firecat a few years ago, it had OEM track on it as well. Also had the same thing happen with a 550 I had a long time ago, OEM, and again with an aftermarket(Predator) on the 550.
Everytime this has happend, it was always the one row closest to he rail. I know how to align and tension a track. I'm actually pretty anal about that stuff.
The track in my racer is intact, and it sees the most abuse compared to any other sleds I have. Go figure! Any thoughts? Tracks aren't cheap:-(
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#2 User is offline   C-note Icon

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Posted 13 April 2012 - 01:43 PM

Which side (as sitting on sled)?.. I may have a smidgeon of a clue from past experience on older '92 Jag440 I used to punish
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#3 User is offline   711X Icon

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Posted 13 April 2012 - 02:19 PM

View Postgroulxs, on 13 April 2012 - 10:48 AM, said:

Hi Folks,

Hope someone here can help shed some light on this. Here's my situation:
Was taking studs out of my 570 yesterday, and noticed that one row (out of 4) of drive lugs in the track is badly damaged. I'm not sure how this could happen, since the drive sprocket should be putting equal pressure on all 4 rows of drive lugs.
The track is OEM. Same thing happened with my Firecat a few years ago, it had OEM track on it as well. Also had the same thing happen with a 550 I had a long time ago, OEM, and again with an aftermarket(Predator) on the 550.
Everytime this has happend, it was always the one row closest to he rail. I know how to align and tension a track. I'm actually pretty anal about that stuff.
The track in my racer is intact, and it sees the most abuse compared to any other sleds I have. Go figure! Any thoughts? Tracks aren't cheap:-(

Have you ever had the rear skid out of the sled? If you have then it was not installed properly. I have seen this happen before. The idler arm is in the down position rather than up.
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#4 User is offline   Tito Icon

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Posted 13 April 2012 - 03:19 PM

View Post711X, on 13 April 2012 - 02:19 PM, said:

Have you ever had the rear skid out of the sled? If you have then it was not installed properly. I have seen this happen before. The idler arm is in the down position rather than up.
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#5 User is offline   groulxs Icon

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Posted 13 April 2012 - 06:58 PM

View PostC-note, on 13 April 2012 - 03:43 PM, said:

Which side (as sitting on sled)?.. I may have a smidgeon of a clue from past experience on older '92 Jag440 I used to punish


I beleive it was on the mag side, everytime.
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#6 User is offline   groulxs Icon

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Posted 13 April 2012 - 07:05 PM

View Post711X, on 13 April 2012 - 04:19 PM, said:

Have you ever had the rear skid out of the sled? If you have then it was not installed properly. I have seen this happen before. The idler arm is in the down position rather than up.


Then why just one row out of four? An outter row at that. <_< From what I can remember, I never took the suspension apart on my old 550, and it happened twice. At first, I had a shock mount brake, and attributed the damage to the shock getting wedged and knocking off a row of cogs, but then it happened again, with a brand new track :shoot-me:

Lastly, whenever I'm in doubt, I refer to parts fiche and assembly drawings to put stuff back together.

I'm not saying that you are wrong... I'm simply trying to supply you with all the info that I can so that we can get to the bottom of this. I value your input... keep 'er comin'!
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#7 User is offline   groulxs Icon

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Posted 13 April 2012 - 07:24 PM

View Post711X, on 13 April 2012 - 04:19 PM, said:

Have you ever had the rear skid out of the sled? If you have then it was not installed properly. I have seen this happen before. The idler arm is in the down position rather than up.


You had me so freaked out about this that I actually just went out with a flashlight (in my underwear, ha ha!) :eyes-poppin: to check both affected sleds. Idler arm on both sleds is mounted exactly as shown on the parts fiche (preload adjuster blocks down). Could the parts fiche be wrong? I've seen innacurrate specs before, but the assembly drawings haven't deceived me yet...
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#8 User is offline   2lapsdown Icon

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Posted 14 April 2012 - 06:59 AM

View Postgroulxs, on 13 April 2012 - 07:24 PM, said:

You had me so freaked out about this that I actually just went out with a flashlight (in my underwear, ha ha!) :eyes-poppin: to check both affected sleds. Idler arm on both sleds is mounted exactly as shown on the parts fiche (preload adjuster blocks down). Could the parts fiche be wrong? I've seen innacurrate specs before, but the assembly drawings haven't deceived me yet...

That is quite a visual!
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#9 User is offline   groulxs Icon

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Posted 14 April 2012 - 08:07 PM

View Post2lapsdown, on 14 April 2012 - 08:59 AM, said:

That is quite a visual!


Ha! I knew someone would see the humor in that.

C'mon now guys. I'm sure I'm not the only this has happened to. There has to be some logical explanation why this happens. I'm still waiting to hear how an improperly mounted idler arm would chew out a single row of drive lugs? This is really messing with me :pulling-my-hair-out:
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#10 User is offline   Insanecat Icon

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Posted 16 April 2012 - 05:23 PM

View Postgroulxs, on 13 April 2012 - 09:24 PM, said:

You had me so freaked out about this that I actually just went out with a flashlight (in my underwear, ha ha!) :eyes-poppin: to check both affected sleds. Idler arm on both sleds is mounted exactly as shown on the parts fiche (preload adjuster blocks down). Could the parts fiche be wrong? I've seen innacurrate specs before, but the assembly drawings haven't deceived me yet...


Boxers or briefs? :lol:
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#11 User is offline   groulxs Icon

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Posted 17 April 2012 - 06:05 AM

View PostInsanecat, on 16 April 2012 - 07:23 PM, said:

Boxers or briefs? :lol:


Thong! :o
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#12 User is offline   Tito Icon

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Posted 17 April 2012 - 11:42 AM

View Postgroulxs, on 14 April 2012 - 08:07 PM, said:

Ha! I knew someone would see the humor in that.

C'mon now guys. I'm sure I'm not the only this has happened to. There has to be some logical explanation why this happens. I'm still waiting to hear how an improperly mounted idler arm would chew out a single row of drive lugs? This is really messing with me :pulling-my-hair-out:
Throw up a picture. Once the arm has been mounted in the down position it eliminates most of all the shock travel. When ridden the travel has to go somewhere which is into the track and sometimes bending up some parts. If bent bad enough even when mounted back right will have enough free play to let it flip back down and do the same thing. Like "Peggy" says its common problem. When remounting suspension the link always folds down if your not watching. Because its much easier to get the rear bolts in with it folded down.
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#13 User is offline   711X Icon

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Posted 17 April 2012 - 03:27 PM

View PostTito, on 17 April 2012 - 11:42 AM, said:

Throw up a picture. Once the arm has been mounted in the down position it eliminates most of all the shock travel. When ridden the travel has to go somewhere which is into the track and sometimes bending up some parts. If bent bad enough even when mounted back right will have enough free play to let it flip back down and do the same thing. Like "Peggy" says its common problem. When remounting suspension the link always folds down if your not watching. Because its much easier to get the rear bolts in with it folded down.

You have that correct. Been there done that.
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#14 User is offline   groulxs Icon

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Posted 17 April 2012 - 07:19 PM

OK Tito. PM sent.
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Posted 08 May 2012 - 06:37 PM

Your front shock shaft is probaly loose. If it's been that way for a while the holes in the rails are likely elongated allowing the shock shaft to drop into the track. It would explain why it's always the lugs closest to the rails that are getting chewed.
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#16 User is offline   groulxs Icon

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Posted 11 May 2012 - 05:56 PM

View PostNo.6, on 08 May 2012 - 08:37 PM, said:

Your front shock shaft is probaly loose. If it's been that way for a while the holes in the rails are likely elongated allowing the shock shaft to drop into the track. It would explain why it's always the lugs closest to the rails that are getting chewed.

I'll check it out
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