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I took notice while greasing the PTO drive shaft as compared to the tractor drive shafts to transmission and front axle. The PTO fitting were easy to get on to for greasing while the tractor drive shafts were not. I observed the PTO drive shaft u joints are bigger than the two tractor drive shafts. A 22 mm diameter by 60 mm long on PTO shaft vs the tractor drive shaft u joint being 20 mm diameter by 50 mm long. Don't sound like much but makes all the difference.

I now wonder why JD DID NOT USE THE SAME BIGGER SIZE ON THE TRACTOR DRIVE SHAFTS AS WELL. They seem too small on drive shafts. There is more than enough room to have designed for 22x60 u joint.

JD lists a replacement u joint for the 2 series but none for the 1 series tractor drive shafts. Is the 2 series u joint listed as P/N LVA803335 a fit on the 1 series?
 

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It's able to be a lot smaller because it has a much greater mechanical advantage than the driveshaft. As far as the PTO, the large diameter prevents wobble more than anything. The engine-tranny shaft is much shorter. It's as big as it needs to be, I just dislike the lousy way it's coupled to the transmission with a splined yoke.
 

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It's able to be a lot smaller because it has a much greater mechanical advantage than the driveshaft. As far as the PTO, the large diameter prevents wobble more than anything. The engine-tranny shaft is much shorter. It's as big as it needs to be, I just dislike the lousy way it's coupled to the transmission with a splined yoke.
Will NOT let me edit my post..

I read the original post wrong, I thought you were asking about the engine driveshaft.
 
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Will NOT let me edit my post..

I read the original post wrong, I thought you were asking about the engine driveshaft.
Yes I was, engine to tranny and tranny to front axle. Both have small u joints. Because so small it's difficult to get to grease fitting. It would be better if JD used the same size u joint as the PTO shaft.

Does LVA803335 (small joint on drive shafts listed for series 2) fit a series one tractor?

I see no JD u joint listing for series one tractor. I have one u joint I'm worried about since it has never taken grease. The other three are fine.
 

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Sorry I don't know the part number of the joints, they must be replaceable though.

Also, if you took apart, I'd guarantee a driveline shop could the dimensions and get a replacement too.
 
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