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Coupler Chain Revisited

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A.P.

12-30-2002 18:52:14




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I stopped by an Agco/Oliver dealer today and talked with one of their mechanics about the coupler chain problem some people have experienced. Besides mis-alignment and worn sprockets/coupler chain he says the other problem is using the wrong cotter pins and instaling them wrong. Turns out the cotter pins, in the kit from AGCO, are hardened. The kit consists of two pins, two end plates and three cotter pins. The long cotter pin goes through both pins to keep them from turning and is supposed to go to the transmission side off the chain. The heads of all the cotter pins are supposed to be in the direction of rotation. In other words the rotation of the chain will try and force the head of the cotter pins into the link pins.

He says it is a bear to install them right but he has never had a problem. I hope I didn't mess this up too badly in retelling it. Any errors are mostlikely cused by a short attention span and questionable hearing on my part ;-)

I hope this helps out.

Take care,
A.P.

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alberta dave

01-02-2003 09:56:20




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 Re: Coupler Chain Revisited in reply to A.P., 12-30-2002 18:52:14  
I have always found that the alignment is the key. I have not had a chain failure in over 10 years and I would have to guess that if I checked the cotter pins they would be facing the Hydra-power. The last time I let a shop work on one of our tractors I found, after the third chain failure in that season, that the coupler was about a 1/8" inch out. I corrected the problem with shim stock under the engine mounts and eye balled it. Never had a problem since.

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Bill

01-02-2003 19:23:14




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 Re: Re: Coupler Chain Revisited in reply to alberta dave, 01-02-2003 09:56:20  
Be careful shimming up the back of the motor. We have seen it cause problems in the torque because it misalignes the shafts inside. The best way to get the back of the torque up is to drill and tap a hole in the frame under the torque and screw it up until it is level or slightly below the transmission gear.



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Shep

12-31-2002 05:08:58




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 Re: Coupler Chain Revisited in reply to A.P., 12-30-2002 18:52:14  
No, that sounds about right. I use the hardened cotter pins and always TRY to put them in the direction of rotation, but it doesnt always work. I have always put the long cotter pin on the three speed side though, I guess just because it is easier to get to there and I have never had a problem.

I did shatter a coupler chain about two weeks ago on my 1855 Cummins pushing manure. I was pushing up and into a pile to make the pile bigger and as I was rolling back down the pile I didnt let the tractor fully stop before I came off the clutch with the loader down again and the tires spun and the Cummins grunted and the chain exploded. Now thats some TORK!!! I learned I need to come all the way off the pile and let the tractor stop before pushing again... Glad it was just a chain that let go...

Have a great new year everyone

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