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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

track shoe bolts

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Robert

11-08-2003 18:05:26




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I recently purchased a Kubota KX151 excavator with steel shoes. Really like this machine. Just used it a fee hours and today cleaned the tracks. Discovered 17 missing bolts for track shoes, they were there when I bought the machine. Any ideas as to what caused this? I did not abuse the machine in those fee hours operating it.




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jim

11-10-2003 10:31:34




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 Re: track shoe bolts in reply to Robert, 11-08-2003 18:05:26  
you may already know but track pad bolts are not common hardware,they are a special bolt that are larger in the shoulder,they may look close but if there is any play at all they will shear very easy.if you order one by part number then you can have it to match up with at after market source. although sometimes there not that bad at a dealership.bottom line is close but not exact wont work on track pads,i have been there before as we have 25 tracked hoes.

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Len Sholes

11-09-2003 09:41:27




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 Re: track shoe bolts in reply to Robert, 11-08-2003 18:05:26  
Robert just to add to what Deas Plant advised you and that is even with grade 8 bolts you can have breakage. The correct torque on the bolt stretches the bolt to give the retention needed to hold the shoes tight to the rail. I have seen it where the bolts have been over torqued and when the machine is put to work the bolts will start to break. Even though an excavator is just sitting there as you dig depending on your underfoot conditions you can still have some tremendous loads applied to the shoe to rail joint. ie edge of a track shoe sitting on a rock. Just like with crawlers you should use the narrowest shoes that you can to increase undercarriage life. One other thing and that is before you bolt the shoe back to the rail make sure the mating surfaces of the link and shoe are flat and clean other wise you will never keep the hardware tight.

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ED

11-08-2003 22:17:26




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 Re: track shoe bolts in reply to Robert, 11-08-2003 18:05:26  
If you need bolts&nuts I have them just email me



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Deas Plant.

11-08-2003 22:02:51




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 Re: track shoe bolts in reply to Robert, 11-08-2003 18:05:26  
Hi, Robert. They may have been loose before you started and worked themselves the rest of way or broke while you were working. More likely, I think, is that they are sub-standard bolts and simply can't handle the job. In spite of the fact that excavators don't move around a lot, they still give their tracks a bit of wrenching around as they work. Unless the bolts are good quality, i.e. grade 8 or grade 9, they won't be really happy with this - and you won't be happy with them. You can not skimp on track shoe bolt quality. Well, you can, but you'll pay for it in the long run. Hope this helps. You have a wonderful day. Best wishes. Deas Plant.

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