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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

driving out the master link

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Toby

08-22-2007 17:45:53




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Roy or anyone got a 750 john deere track came off because some one did not tighten fitting on track adjuster. Question is how is the best way to drive out pin with track half off.. Drive pin seems to need to be driven from the back side. Do I heat what how much hammer and what kind of punch or whatever. Tracks on loader or alligator and much easier.

Thanks
toby




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rancherruss1916

08-24-2007 11:54:52




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 Re: driving out the master link in reply to Toby, 08-22-2007 17:45:53  
i took the end of a leaf spring i found that an old master pin would fit through, ground the old pin down so it couldnt stick bolted the spring end to the track and heated it with a torch and bent it till it lined up with the pin. big sledge and a torch and youll get it out without any busted knuckles. thats how i did it on my d8 changed both tracks that way. hope this helps



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steve n carol

08-24-2007 04:59:54




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 Re: driving out the master link in reply to Toby, 08-22-2007 17:45:53  
Is it possible to relax the tensioner and unbolt the sprocket? just a thought...sl



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Roy Suomi

08-22-2007 20:15:52




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 Re: driving out the master link in reply to Toby, 08-22-2007 17:45:53  
I usually work alone when out with the service truck..I use a B&O hammer [ railroad spike hammer]..I lay the handle on the ground and support the head with small wooden blocks and rest my left foot on the handle..I have an 18 lb. sledge as a persuader..If it doesn't go with that , heat up the track links[both sides] with a torch rosebud till they get slightly red and quickly get the persuader into action..I also have a "T" made up from 1" cold rolled round bar stock..The head approx 12" long with handle length of about 40" long..Weld the head onto the handle off center..4 inches on one side of the handle and 8" on the other side..The longer end allows the "punch" to drive the pin through the far side link..If your tracks are SALT [ sealed and lubricated tracks] there should be a bolt together master link that interlocks together when the track shoe bolts are tightened..

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NC Wayne

08-22-2007 19:52:04




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 Re: driving out the master link in reply to Toby, 08-22-2007 17:45:53  
To drive out a master pin your definately gonna need two people, one of whome needs to be able to really swing a sledge hammer (at least a 12lb, prefferably a 16) and really put some a$$ into it when he does. It depends on the width of the track pads, and in your case the area your gonna have to break it in as well, but the easiest thing to use as a punch is a railroad spike hammer. They come in different sizes so you'll need one with one of the head end diameters smaller than the diameter of the pin. Think of the RR hammer as a punch with a handle. One guy holds one head end of the hammer against the link while the other guy hits the other end with the sledge. Now if for some reason you can't use a RR hammer you can make you a trick out of something like 3/4 EMT or something like that. Cut one piece about 4 feet long for the standoff. Next cut another piece about a foot long and weld it to the end of the other at a 90 degree angle to form a T. To that piece weld two rings just slightly larger than whatever solid piece you've got to use for a punch. Now if you've got a piece of light tube the right size just use it instead of the small piece and the rings, and it serves the same purpose. On other end weld another piece of the 3/4, about 2 feet long, inline with the piece on the other end but weld it at the end of the piece, not in the middle. This helps the man holding support the overhanging weight of the punch. If you can put a head on the punch slightly larger than your rings so it won't fly through if something should happen or if the pin decides to just jump out (and pray it does). Also make sure the piece you use for the punch is fairely tough, not so hard it breaks off and not so soft it mushrooms excessively. If the end doing the driving mushrooms against the pin too much when the pin finally comes out it can be a bear to get the mushroomed end back through the link. Dad and I have been driving pins like this for over 20 years and either way works pretty good if your guy driving can hit solid and hard and the guy holding can hold steady for him. One other trick, if you can at all avoid it, make sure the punch/RR hammer you use is long enough so you don't have to pull the pad. Doing so will alow the link to spread if the pin is excessively tight and that just tends to make it that much tighter and harder to drive out. GOOD LUCK...

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Toby

08-23-2007 03:32:22




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 Re: driving out the master link in reply to NC Wayne, 08-22-2007 19:52:04  
The drive pin must be in backwards as the indention is on the back side and it is not seated completely it lacks 1/4 inch. will it drive either direction as the track is laying completely off and the drive link is on the very top how can I get the thing solid enough to hit it hard enough. I realize this is a dumb question but I see a big problem ahead.

Toby



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NC Wayne

08-23-2007 18:06:36




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 Re: driving out the master link in reply to Toby, 08-23-2007 03:32:22  
Every pin I"ve encountered is the same diameter on both ends so it should drive out either way. In your case if the dimple is to the inside and the pin is protruding on that side and not the other then by all means drive it from the outside to the inside. I say that because the reason the pin isn"t seated may be because it was tight going in and they wound up mushrooming the dimple end slightly and that"s what"s keeping it from going all the way in flush. As far as the height issue the only way I know to deal with that would be to build up a dirt pile beside the track to get the height needed to make it managable. Beyond that all that"s left is mole"s idea to call the dealership and have them press the pin out with a portable master pin press. Even if you have to get them to press it out all you"ve got to do is clean the holes in the links with a flap wheel and then use a new pin and you should be able to drive the pin back in with no problem. Again, Good luck.

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mole

08-23-2007 12:32:01




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 Re: driving out the master link in reply to Toby, 08-23-2007 03:32:22  
After more than 10 years working on CAT stuff, I would just call the dealer and have them come out with a service truck and a portable track press. They can press the pin out in less than an half an hour. When you get the track back on the dozer have them come back and press it back in. What takes you a day or more to do they can do for about 2-4 hours of labor time depending on how far they have to drive. Just have them do the pressing and you do the rest to save on labor charges. It also saves a lot of busted knuckles and smashed fingers too.

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