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track problem

track problem

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mcbitchman
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oh oh,,,, 1937 RD4 dropped track... the track is still on the rear sprocket but it's off the front wheel and middle idler pulley.... so how does one fix this… do you have to release the huge spring somehow, or can the track be 'popped back on... please help... one could get hurt w/ that big spring I think.... thank you.... ps and by the way... anyone know of where there might be a manual online for these crawlers...
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Sun, Sep 8, 2019 8:05 AM
nomorejohndeere
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ebay for manuals

pry bar and a helper
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Sun, Sep 8, 2019 8:16 AM
bursitis
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Reply to nomorejohndeere:
ebay for manuals

pry bar and a helper
there is a big nut attached to the yoke that hold the front idler. this nut is also on a big threaded rod that runs into the spring. the yoke has two cross bolts that clamp the yoke onto the nut that must be loosened fbefore you can spin the nut allowing the yoke to move rearward. when all of this is accomplished you can pry the track back on or drive out the master pin and do it that way.

D46U straight blade,D46U cat angle blade,allis chalmers AD4 grader and Khoering 404 dragline. D4C 40A,D4 2T and scraper.

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Sun, Sep 8, 2019 9:11 AM
mcbitchman
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Reply to bursitis:
there is a big nut attached to the yoke that hold the front idler. this nut is also on a big threaded rod that runs into the spring. the yoke has two cross bolts that clamp the yoke onto the nut that must be loosened fbefore you can spin the nut allowing the yoke to move rearward. when all of this is accomplished you can pry the track back on or drive out the master pin and do it that way.
by the front idler do you mean the large spoked wheel on the front that the track rolls on? there is also a small idler in the middle between the front and rear sprockets/wheels.... I've heard that the master pin is very hard to get out even w/. a press.,. so it's best to try to get the nuts on the spring to move so the spring will relax???
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Sun, Sep 8, 2019 10:40 AM
mcbitchman
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Reply to nomorejohndeere:
ebay for manuals

pry bar and a helper
[quote="nomorejohndeere"]ebay for manuals

pry bar and a helper[/quote]

by pry bar and helper do you mean one can actually pry the track back on by collapsing the spring???
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Sun, Sep 8, 2019 10:42 AM
nomorejohndeere
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Reply to mcbitchman:
[quote="nomorejohndeere"]ebay for manuals

pry bar and a helper[/quote]

by pry bar and helper do you mean one can actually pry the track back on by collapsing the spring???
backing the adjustment off the threaded rod will shrink it up a bit and give you room if your threads are working and not rusted up

but it is loose enough to come off....so it might go back on without???

come off the top? to the inside? or outside?

have a helper to run the dozer use a prybar and walk it back on like a bicycle chain

use come along, ratchet straps, another vehicle, boomers to pull around on the track for help
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Sun, Sep 8, 2019 10:53 AM
mcbitchman
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Reply to nomorejohndeere:
backing the adjustment off the threaded rod will shrink it up a bit and give you room if your threads are working and not rusted up

but it is loose enough to come off....so it might go back on without???

come off the top? to the inside? or outside?

have a helper to run the dozer use a prybar and walk it back on like a bicycle chain

use come along, ratchet straps, another vehicle, boomers to pull around on the track for help
it came off on the inside so we've got that going for us.... it did seem as though one might be able to pry it on as the spring tension is what holds it tight... can you then adjust the tension on the track by tightening the nut or loosening it... thank you for your help .. Doug
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Sun, Sep 8, 2019 9:34 PM
STEPHEN
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Reply to mcbitchman:
by the front idler do you mean the large spoked wheel on the front that the track rolls on? there is also a small idler in the middle between the front and rear sprockets/wheels.... I've heard that the master pin is very hard to get out even w/. a press.,. so it's best to try to get the nuts on the spring to move so the spring will relax???

You need to turn the split nut so the complete assembly of spring, end plates, and bolt is moved away.
If you have never been into those parts, you might need to get a lot of loose juice. Loosen the two bolts clamping yokes to the split adjusting nut and try to get that moving. It helps to have a proper wrench that is made to get into that space. Sometimes a lot of heat helps, and then anti-seizure on the threads.
Get the other side worked loose later as well, so you can keep them adjusted to minimize derailments.

Send the pics!
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Sun, Sep 8, 2019 10:01 PM
mcbitchman
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Reply to STEPHEN:

You need to turn the split nut so the complete assembly of spring, end plates, and bolt is moved away.
If you have never been into those parts, you might need to get a lot of loose juice. Loosen the two bolts clamping yokes to the split adjusting nut and try to get that moving. It helps to have a proper wrench that is made to get into that space. Sometimes a lot of heat helps, and then anti-seizure on the threads.
Get the other side worked loose later as well, so you can keep them adjusted to minimize derailments.

Send the pics!
what is the split nut? I'm going out there now so I'll take some pics so u can see wtf.... I've never done one of these so .. ouch... but as always ACMOC is the source for great info.... we'll get it sooner or later but we will. thanks very much for the help.... Doug
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Sun, Sep 8, 2019 11:53 PM
Deas Plant.
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Reply to mcbitchman:
what is the split nut? I'm going out there now so I'll take some pics so u can see wtf.... I've never done one of these so .. ouch... but as always ACMOC is the source for great info.... we'll get it sooner or later but we will. thanks very much for the help.... Doug
Hi, mcbitchman.
The 'split nut' is the one that the two clamp bolts clamp down on. It has a split in each side of it so that the clamp can tighten it down on the thread to lock it in place after you have adjusted the track.

Does that make sense?

Just my 0.02.

You have a wonderful day. Best wishes. Deas Plant.

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Sun, Sep 8, 2019 11:58 PM
neil
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Reply to Deas Plant.:
Hi, mcbitchman.
The 'split nut' is the one that the two clamp bolts clamp down on. It has a split in each side of it so that the clamp can tighten it down on the thread to lock it in place after you have adjusted the track.

Does that make sense?

Just my 0.02.
Under normal circumstances, that spring should not exert any pressure on the track. If it is right now, it could be due to the track being off the rails. Could you confirm if it's the spring pressure or not?
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Mon, Sep 9, 2019 12:16 AM
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