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Broken roller pin

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CAMPRO

01-22-2003 07:31:52




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I broke the roller pin inside the bushing on my 1980's D3B track. The track did not complete break lose as the other side of the pin is still holding the track together. Is there a procedure to weld this without taking the whole track apart and pressing the bushing and pin out?




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Bob/Ont

01-22-2003 10:29:23




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 Re: Broken roller pin in reply to CAMPRO, 01-22-2003 07:31:52  
Campro, I think you mean a track pin has broken. You can take the pieces of the pin out and put in a new pin but it will be a hard job. Take a torch and blow a good sized hole in the end of the pin at both ends, about 1 to 1,1/2" deep to make it shrink and get free in the link. Slack off the track adjuster and move the bad pin to the front of the idler. Try to support the track shoe to get the link in line and pound the pin out. If you can get the pin shrunk enough it will come free and pound out with a sledge. Then you can drive in a new pin with a sledge. We sometimes use a dummy pin( one that fits loose) to keep things lined up to drive in a master pin. Polish the bores in the links and freeze the pin with liquid nitrogen if you have some to make things easier. A track press would be nice but that is wishing for too much I think. Keep in minde if this is not the master pin, the bushing enters counter bores in each side link, this should keep the track from coming right apart. Email me if you need more information.
Later Bob

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CAMPRO

01-24-2003 07:17:03




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 Re: Re: Broken roller pin in reply to Bob/Ont, 01-22-2003 10:29:23  
Bob, We took the whole track off and brought it in to the shop. After examining the track, we noticed the pin did not break, but simply came loose and worked its way out. The pin is so loose it would have fell out. Theses are semi-new pins and bushing which have not been turned. The sprocket looks very new. However the rails on the chains are very worn and the rollers have ground the ends of the pins down from riding on them. This may have cause the pin to work loose. Can we just weld this pin back in? How much work is it to weld up the rails, or is it cheaper to just by a new chain?

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