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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Welding Track Support Roller

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Robert Peck

12-10-2005 15:23:20




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Anyone tackled welding a track support roller? I am working on an H-3 crawler. The top track support roller is badly elipsed or grooved from not turning and the track chain wore into it. I need to return it to a perfect radius so that it functions as originally designed. Can these be machined down and then weld a new sleeve on to save them. I nearly fell on the floor when the dealership informed of the price for one! If I purchased two they would run more than I paid for the machine. Appreciate your thoughts.

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Robert Peck

12-11-2005 03:55:41




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 Thanks for the Advice!!!! in reply to Robert Peck, 12-10-2005 15:23:20  
Gentlemen: Many thanks for the good advice. Wish each of you a Great Holiday Season!!!!

PS Seann that is a great link that you provided to the ACMOC Board, I like to read before I tackle some of these repair issues so that I can pursue a range of options. Thanks Again Bob!



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CH

12-11-2005 02:23:30




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 Re: Welding Track Support Roller in reply to Robert Peck, 12-10-2005 15:23:20  
How about a used one for $100.



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Dale(MO)

12-10-2005 16:13:50




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 Re: Welding Track Support Roller in reply to Robert Peck, 12-10-2005 15:23:20  
Robert,
You are on the right track. They can be welded easily (they are steel, not cast iron). Just be sure it is not grooved down to where it will get into the oil compartment. With my luck, it would fall in half! If you have a lathe, you could even build up the whole side and turn it back to shape, but you would probably need lots of time. The sleeve idea is probably the best.

Good luck,
Dale(MO)

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seann

12-10-2005 16:10:30




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 Re: Welding Track Support Roller in reply to Robert Peck, 12-10-2005 15:23:20  
They can be welded back up to original spec, there are a few ways to go about this. One is to disassemble the roller and then apply heavy welds around the outer wear surfaces. The main problem with this method is that the heat produced by these heavy welds may warp the inner circular area of the roller that mates with the inner bushing/bearing. One solution to this problem is to remachine the inner bore after weld up using a lathe so that it is restored to original spec before reassembly. Another method is to try and keep heat distortion to a minimum by immersing the lower half of the (often assembled) roller into a container of water and then welding up the surface directly using various rod/wire types. You have to weld in increments (providing frequent cooling periods) so that the heat buildup is kept under control, but apparently this method can and does work well. Plus from what I've heard you really don't need to turn the welded up outer surface down to a nice machined surface using a lathe, as long as you apply the weld bead with reasonable precision on the roller's wear surface. The track system and dirt will self machine the built up surfaces during normal track use use just fine.

Here's a link off of the ACMOC board which discusses this subject. Lincoln welding apparently has a very informative brochure on the subject too (concerning what rod types and buildup methodology).

Good luck

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