Dozer link repair

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The stiry behind this one is: the bolts broke on the pin keepers and went unnoticed? The pins walked out enough to bind up under a load. I must say NOTHING will suprise me in this line of work! All-in-all it turned out to be a good repair. All the cylinder pins were siezed and had to be cut out as well as replace all bushings for not taking grease. Attached Images
Reply:due to the bend in the plates, the holes were oblong... Had the machine shop to make some bushings. Cut the holes oversized to accept the sleeve and welded. The plates were straightened in our 100 ton shop press. The thickest plate was 1 1/4" and had to be cut just to straighten in such a short piece. Attached Images
Reply:very good work!! what did you use for a welder? is that flux core?
Reply:10-4 everything with the exception of sheet metal repairs, is with dual shield fluxcore. My shop welder is a Miller 450 cp ( awsome machine ) .
Reply:That came out nice.Were the DOM, or machined bushings, (the ones on the non moving part of the pin in the ears) original to the machine before it broke, or do you think it was another past repair before it came into your shop?I've used that method when making a piece of equipment because the inserts make it easy to align the pin and eye properly without perfect positioning of the ears.  You can always massage the hole before you weld the tubing in.  They also make great spacers, and a way to spread the load on the pin/ear assembly."Any day above ground is a good day"http://www.farmersamm.com/
Reply:Real nice looking repair. What did you use to cut the pin out?Trailblazer 302Hobart Stickmate AC/DCLincoln SP 135 TSmith torchSpoolmatic 30A
Reply:Nice work, fchesser78. What kind of dualsheild do you run? Make, model, dia., gas, ect.?"Where's Stick man????????" - 7A749"SHHHHHH!! I sent him over to snag that MIC-4 while tbone wasn't looking!" - duaneb55"I have bought a few of Tbone's things unlike Stick-Man who helps himself" - TozziWelding"Stick-man"
Reply:It would be worth going to NC to see your repairs in action.  Hard to imagine 100 ton press not bending something without a relief cut.Miller 185Lincoln Weldanpower 225Lincoln 225 buzz boxCheap-o C&H 110v (my first welder)
Reply:.  Hard to imagine 100 ton press not bending something without a relief cut.[/QUOTE]I thought it would have bent it for sure.. I assume the reason is due to the small size of the piece. If it had more surface area on either side of the bend it probably would have worked.
Reply:Originally Posted by shortarcReal nice looking repair. What did you use to cut the pin out?
Reply:I use .045 Lincoln 71-M fluxcore with Shield pro 101 or 75/25 gas mixture
Reply:Thanks farmersamm, I used the bushings in this case because the holes were stretched,  Instead of Line-boring the holes once i straightened the plates. It saved time and money and turned out real nice.
Reply:VERY NICE  Another incentive for their maintenance folks to do a better job maintaining that dozer.Co-Own CNC shop:Miller :1251 plasma cutter, MaxStar 700 TIG/Stick, & XMT 456 Multiprocess Welder.&  2 Hypertherm HPR260's Plasma CutterSorry I had a bad stroke but now I am back.
Reply:I've never seen one of those torches.  Are those like regular carbon gouging/cutting rods, except hollow?  Just curious, how thick will that thing cut?  BTW, nice looking repair.Work HARDER, not smarter! ------------------------ Miller Bobcat 250Millermatic 251Lincoln Precision TIG 185Hypertherm PM 600Hobart 135 HandlerOxweld 400 FlameMaster
Reply:Originally Posted by fchesser78I use an isothermic cutting torch with a 1/4" rod. It runs off of a current through the welder as well as oxygenOnce the hole is sliced through then I use a wash tip and wash all the way to one side... Usually it relieves the pin enough to knock it outthanks
Reply:I dont know the true science behind this tool other than it works vorks verry well. The rods are about 2 1/2 feet long and look like rolled up, thin sheet metal - in a completely different class than carbon arc. You attach the ground to a "striking" plate, drag the rod across then hit the trigger. The rod resembles a sparkler until it hits metal then it becomes a devistating cutting tool with sparks and slag flying everywhere until the pin is pierced then the energy directs to the opposite end. The largest pin I have cut was 16"-18" and 3" in dia. The rods consume as you cut, so you just keep changing them out as needed.
Reply:It sounds like the oxygen lances we used to use in the foundry .We used a 3/4 black iron pipe with a air fitting and a ball valve  hooked up to the oxygen bottle.We would heat the end of the pipe up till it was white hot then turn on the oxygen.That lance would burn threw refractory steel or whatever you wanted the steel pipe was the consumable.When we needed more we had magnesium filled pipes that would burn much hotter. It was a much cruder version i think of the torch but the heat was provided by the flame instead of the electric arc.After the arc has died the weld remains
Reply:Looks Good FChesser78.