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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

masterlink on komatsu D21 dozer

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richard Overton

01-11-2007 21:28:01




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I slipped the track off my komatsu d21 bull dozer -no damage to spockets etc - now just have to find the master link and take apart and reassemble -my question is how do I identify the master link and how hard is it to remove and replace it after I place the track back on the rollers ?
any help will be appreciated- my 18 yearold duaghter got it high centered and in the process slipped the track

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Richard Overton

01-12-2007 06:46:53




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 Re: masterlink on komatsu D21 dozer in reply to richard Overton, 01-11-2007 21:28:01  
Thanks for the advice , I will have to find the idler release valve that you are talking about .
There is a master link pin with a small depressed center so if worse comes to worse I will have to try to sledge hammer it out ,
I know it sounds stupid ,but can the pin be removed from either direction ?
I plan to push it out from the outside of the track toward the inside .
Again Thanks Richard

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ajk

01-12-2007 12:11:10




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 Re: masterlink on komatsu D21 dozer in reply to Richard Overton, 01-12-2007 06:46:53  
Not a stupid question at all,years back a lot of track master pins were directional,one end of the pin been D shape to stop it from turning,they would only go in from one side,your machine will have a straight pin and will go either way,when you find the pin examine it to see if it has been hammered in and swollen,some people tend to hit the pin directly with the hammer when driving it in and peen the pin thats why a suitable drift (punch) should be used,try first to get it on without splitting,the relief valve should be beside where you put the grease gun on to pump the track,if you get the idler back and the weight off the back use a tractor or something to pull the slack to the back and towards sprocket you stand a good chance of getting it back on
Good luck
AJ

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ajk

01-12-2007 01:58:03




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 Re: masterlink on komatsu D21 dozer in reply to richard Overton, 01-11-2007 21:28:01  
Hard luck Richard,have you tried opening the adjuster relief valve and pushing the idler back as far as it will go to get more slack,get all the slack you can to the back,then with a long bar going under the track to the top of the sprocket get a second person to slowley reverse the sprocket on that side,this works better if you can jack up the back.if you have to remove the master pin it will not be easy to get it out as it is an interference fit,you will need a decent piece of steel bar a little bit smaller than the pin,weld a handle to it so it can be held safely,a big sledge hammer and with the track held solid try to drive it out,you may even need to heat the eyes if its very tight,there are two types of tracks, the sealed and lubricated type that does not have a master pin but a split link instead and all you need to do is find the split link and remove that pad,the type that I think you have are known as the sealed type and have a master pin,it will be the one with a dinple in the centre or a raised centre,it will differ from the rest of the pins,cleans the ends and look for the odd one,if you are not used to working with tracks watch your fingers getting chopped off between the pads and wear eye protection while doing any hammering,go to the link below where I posted a drawing of the split link,master pin and dust seals.
AJ

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