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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

roller bolts 44A D6B

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U9 U9 CAT

11-04-2007 19:25:21




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I've have a couple of bolts strip out on the bottom rollers
I've tighten them as tight as I could, and welded the bolt to the roller, is this a good patch?
I realy need to get this thing together, any good easy quick way to fix this. Thanks
The bolts are 5/8 fine, I have good access to the bottom of the roller frame.




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Old Magnet

11-05-2007 08:18:22




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 Re: roller bolts 44A D6B in reply to U9 U9 CAT, 11-04-2007 19:25:21  
I was wondering how long it would be before that problem came up. Not a good application for fine thread.
My 9U parts tractor had a couple roller bolts increased to 9/16 bolt size. Did require enlarging the hole in the roller mounting flange. Fix did work.



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U9 U9 CAT

11-05-2007 12:36:19




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 Re: roller bolts 44A D6B in reply to Old Magnet, 11-05-2007 08:18:22  
yep, the bolts holes are lose I took out the bolt bars now I need figure out if I want to go with inserts at $130 or metric at $85 + tap both would work. Seems like thoughs inserts maybe a tad stronger.
and as a bonus if I go with metric, I'll have bolts for all the extra bolt holds, the line up bolts,? the bolts in between the rollers on the bolt bar Do you think I should go coarse thread?
Thanks LooKen For Parts

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bob plumadore

11-05-2007 05:06:10




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 Re: roller bolts 44A D6B in reply to U9 U9 CAT, 11-04-2007 19:25:21  
NC Wayne gave the best suggestion with the threaded insert. something easier and simpler is to cut a hole in the side of the roller frame and using a longer 58 polt put a nut on it and weld the nut to the bar.



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AJ.

11-05-2007 01:23:13




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 Re: roller bolts 44A D6B in reply to U9 U9 CAT, 11-04-2007 19:25:21  
The next size up without drilling is 16mm metric,get yourself a std 16mm No1 tap,some 16mm 8.8 bolts of the same length as the 5/8 ones,tap the holes out to 16mm,use the metric bolts,they will even have the same size head,torque them up to about 150psi,all rust and dirt should be removed from where the roller flange sits,that machine should have a bar that the roller bolts screw into running inside the track frame that can be replaced but if its only a few bolts I would opt for the metric for a quick solid fix.
AJ

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U9 U9 CAT

11-05-2007 12:42:57




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 Re: roller bolts 44A D6B in reply to AJ., 11-05-2007 01:23:13  
Well, I got her tore down bolt bars in back of truck. I thought it was clean, in that frame, as much washing as I have done.
I have about 10 lose I'm going to go though them all Thanks Yellow HLL



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U9 U9 CAT

11-05-2007 07:56:44




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 Re: roller bolts 44A D6B in reply to AJ., 11-05-2007 01:23:13  
thanks Thats what I needed to know.



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NC Wayne

11-04-2007 19:46:07




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 Re: roller bolts 44A D6B in reply to U9 U9 CAT, 11-04-2007 19:25:21  
If by "patch" you mean your wanting it to hold together long enough to sell, then yes it's about as good as bubble gum. Just hope the prospective buyer (sucker) doesn't notice the weld and ask questions..... Thing is if the bolts are truely stripped then welding them to the roller really does no good. Being welded they can't turn to back out but if the threads are shot they'll simply pull out sooner or later. Being on a bottom roller it'll probably be sooner.... If by having good access you mean you could easily set up a mag base drill then my suggestion would be either use a Helicoil or some other form of thread repair and make a permanant fix to the threads. Being 5/8 you might be able to drill and tap them good enough by hand but a Mag base drill would be ideal. I've done both a D7F and a D9G undercarriage over the past few years and have used "threadserts" on both of them to repair screwed up bolt holes for the bottom rollers.

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