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U-joints 80-R3 Sickle bar mower

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kmw3006 View Drop Down
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Joined: 04 May 2021
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    Posted: 04 May 2021 at 1:17pm
I was given an 80-R3 mower that previous owner didn't need.  It had been sitting around outside for years.  My first project on it is to change the ujoints. Been talking to 2 different AGCO dealers.  One says one size, the other says there is 2 sizes, depending on the shaft, a normal use or a heavy duty use shaft.  My questions for now are, is there 2 styles of shaft and how do I tell the difference.  Thanks
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Mikez View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikez Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 1:58pm
welcome to forum. put a picture on here. Think the heavy duty was for if you were going to tow a hay conditioner behind mower.
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Tracy Martin TN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 6:41pm
Measure the size of the cross. Diameter of cups, and outside to outside of cups, that will tell you the size. HTH Tracy
No greater gift than healthy grandkids!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kmw3006 Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 7:27pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kmw3006 Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 7:39pm
There's the pic of shaft parts. The solid piece (slides to PTO) is approx. 11/16x13/16. The hollow (mower) piece is approx. 1 3/16 x 1 1/16, wall thickness 1/8. Working non other measurement.
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Ed (Ont) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ed (Ont) Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 7:44pm
You may have to get a bit more sophisticated with your measurements. Measure with micrometer to get correct u-joint.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kmw3006 Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 8:23pm


These were the only recognizable symbols on the body of either u-joint. The other joint had Made in USA 24 on the end of the cap
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HD6GTOM Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 9:14pm
Take the whole thing to your local NAPA store. If its like ours, they will measure up everything and have you going asap. Buy the better grade u joints. Their cheep ones are Chinese made.

Edited by HD6GTOM - 04 May 2021 at 9:15pm
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kmw3006 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kmw3006 Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2021 at 6:21am
I did give that a try, but I they couldn't find one that matched the groove for the retaining clip.
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Alvin M View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alvin M Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2021 at 8:25am
Std Part # 70534235 check 12R retaining ring is inside on cup  HD is 70521720 check 14R retaining ring is outside of cup
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kmw3006 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kmw3006 Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2021 at 10:20am
Thanks to all for the great advice so far. Alvin are those AGCO stock numbers or can I take them to other places such as auto parts store. Closest AGCO dealer is an hour away and their hours don't match well with mine. Again thanks to all.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alvin M Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2021 at 10:29am
Yes they are AGCO part numbers
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Mikez View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikez Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2021 at 10:34am
yes that’s an agco part number
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kmw3006 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2021 at 1:35pm
Got the ujoints. one fit real nice, real easy. Other one a bear to get in and ended up ruining it. Replaced it, cleaned yokes up good but was still difficult to get in, but it's done. Got it hooked to the tractor but I'm doing something wrong. Whole thing sits crooked and pivots in toward tractor when lifted. Guessing to fix crooked I have to lengthen the lower left link. Don't see how to get the pivot out
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikez Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2021 at 2:56pm
what tractor you hooking to. Put picture of it hooked 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kmw3006 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2021 at 10:44pm
Hooking up o a Farmall 450. Tryed to link a.picture but keeps saying file to big. I'll keep trying though
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