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Old 07-31-2012, 09:23 PM   #11
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Originally Posted by RONSTAR911 View Post
Well, I'm pretty sure that the design is flawed. There should be a heavier bracket or extended farther to offset the pivot point as the other gentleman pointed out the swing arm is very far back compared to the location of the bracket. Either way I have to fix it And prevent it from happening again. I'm considering upping to the 4000 pound model although it still uses the same bracket setup.
Beg to differ on the design flaw and a heavier bracket, too many out there without your problem. Maybe heavier gauge hardened washers. The lack of torque on the bolt is the culprit. Should it have come loose, no, but maybe a larger gr 8 bolt, hardened washers & nuts would have prevented it. But, bottom line, being loose caused the problem.
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Old 07-31-2012, 09:37 PM   #12
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Al-co manual :see page 31 for torque specs

Alco manual.
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File Type: pdf ALKO_2kto7k_OM.pdf (9.29 MB, 122 views)
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Old 07-31-2012, 09:48 PM   #13
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Did you ever check the torque on the bolts? If the nuts or bolts were eating into the washers, they should have been replaced with hardened washers. They are no doubt gr8 bolts from the torque values. The factory may not have used hardened washers which is a no-no when using any gr8 hardware from a design standpoint.
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Old 07-31-2012, 10:00 PM   #14
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No I never did check the torque, I agree that the bolts came loose and then it was all a matter of time. One point you make is interesting, on the side that pulled out the washer is bent over the nut indicating it was NOT Gr8 hardware. It will be interesting to see how many people when they check theirs find or not find issues or cracks/loose nuts.
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Old 07-31-2012, 10:05 PM   #15
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They are using stop nuts or locking nut which ever you prefer to call them. Those are a one time use component. They can not be torque do to the fact of resistance from the nut nor should they come loose. I disagree with re-torquing without changing out nut.
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Old 07-31-2012, 10:07 PM   #16
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No I never did check the torque, I agree that the bolts came loose and then it was all a matter of time. One point you make is interesting, on the side that pulled out the washer is bent over the nut indicating it was NOT Gr8 hardware. It will be interesting to see how many people when they check theirs find or not find issues or cracks/loose nuts.
You are correct, hardened washers do not bend, they break. As I stated before, when a knowledgeable engineer specifies gr8 bolts, nuts and hardened washers on 1018 steel or the material being clamped is heat treated (hardened) and doesn't require the hardened washers.

No doubt the assembler either grabbed soft washers or someone didn't specify hardened washers, either way, bad mistake.
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Old 07-31-2012, 10:18 PM   #17
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Grade 8 Hardware

Also interesting point Fkent, I have installed many trailer hitches over the years and they ALWAYS use Gr8 Hrdware and a Gr8 Lockwasher and Nut. NOT a NYlock for that same reason. I will definitly be replacing all that hardware when I repair it. Thanks for the input.
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Old 07-31-2012, 10:30 PM   #18
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They are using stop nuts or locking nut which ever you prefer to call them. Those are a one time use component. They can not be torque do to the fact of resistance from the nut nor should they come loose. I disagree with re-torquing without changing out nut.
Gr8 lock nuts can be used more than once. Read SAE J429 spec on locknuts.
Federal Aviation Administration Advisory Circular allows nuts to be reused if the prevailing torque is within specification.
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Old 08-01-2012, 03:04 PM   #19
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Just looked under mine at the ALCO axle mounts - no need to retorque the bolt, the brackets WELDED to the frame????? Now I guess I'll have to crawl under it after EVERY TOW and inspect the welds, with the way welds seem to be failing on TT's. Oh well.
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Old 08-01-2012, 03:15 PM   #20
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Just looked under mine at the ALCO axle mounts - no need to retorque the bolt, the brackets WELDED to the frame????? Now I guess I'll have to crawl under it after EVERY TOW and inspect the welds, with the way welds seem to be failing on TT's. Oh well.
Being the paranoid person I am, I would still replace the soft washers with hardened ones and re-torque the bolts.
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