2072 to CV driveshaft swap?

[nbextermueller]

So with all this recent talk about the 1572 driveshaft tech in another thread, I decided to swap my 2072 rag joint style driveshaft to the 2086 CV style driveshaft.

Here's my issue:
The 2072 hydro pump has a splined input shaft but the rag joint style metal coupler is drilled and pinned to that shaft.

The 2086 CV coupler is slid on the splines then has a 7/16 bolt holding it to the pump. Meaning the end of the hydro pump is drilled and tapped for a bolt.

Is there anyway around getting the new style on the old pump without drilling and tapping the old input shaft? I'm considering swapping the entire rear end to the 2086 (to a avoid breaking the seal on the pump/housing area that is always prone to leaking) but I don't like the look of the newer style housing.

Any ideas are appreciated.

 

[junderwood]

Nic The shaft has a center on it from the turning process. Get some cobalt bits the right size and drill it in chassis. The shaft is only case hardened and drills pretty easy with some cutting fluid and good drill bits. I did this to my 1872 when I installed the Command and the CV style drive shaft.

 

[dtanner]

Nic Bextermueller

you could drill the shaft , I found that the older pump shaft could be swapped and are the same internally. I used a shaft off a 149 pump in my 1512 pump.BTDT

 

[jstertz]

Nic--We did this to my 1772 while still in the tractor. As John stated, use some good bits. I used an angle drill since had access to one. I never even had to remove the rear end from the tractor. I drilled it with a pilot bit and then moved up to the correct size. The I tapped it out--first using a regular tap and then a bottoming style. I made sure that I had threads all the way past the cross drilled hole that is used to retain the rag joint coupler. It is a little work but well worth it! In my application I had to cut down the drive shaft by a couple of inches. Hopefully, you won't have to do that!!!! That added a little more work.