SA-140 Hydraulic Pump Body Square O-ring

RTR · Dec 29, 2017

I recently bought some square cross section o-rings from McMaster Carr to use when rebuilding the hydraulic pumps on Farmall Super A, 100, 130, and 140 tractors. Now, I know I wouldn't have just randomly ordered some o=rings without some recommendation.....whether it was from the Case-IH parts site or a forum member and I had a number to verify the fitment. THese are the square cross section o-rings that fit in an oval shape sealing the 2 halves of the pump body together. I've pulled one out of the package and compared it to the used one from the pump and it is about twice the thickness of the original. I also compared it to one in a very old NOS IH rebuild kit (one that has not been used) and it is still about twice the thickness. For clarification I've also posted which o-rings I ordered from McMaster Carr. Wish I could figure out where I got the info to order them in the first place, but I can't. Someone please help so I can get the correct ones or hopefully these will still work.

THANKS

RTR · Dec 29, 2017

Pictures.....

RTR · Dec 29, 2017

The picture of the specs are hard to see. Sorry about that. Here is that picture again.

Phil Tibbetts · Dec 29, 2017

I don't think you are going to get a round o-ring to fit properly and seal. It needs to be preformed to fit the pump. IMO

RTR · Dec 29, 2017

(quoted from post at 22:28:44 12/29/17) I don't think you are going to get a round o-ring to fit properly and seal. It needs to be preformed to fit the pump. IMO

Phil, that oring has a groove it fits in so it should work just fine in that sense. I'm just worried about the thickness

teddy52food · Dec 29, 2017

Try ordering by dimensions & get ones that are thinner.

Phil Tibbetts · Dec 29, 2017

Then as Teddy said you must have got the wrong size

RTR · Dec 29, 2017

(quoted from post at 23:38:21 12/29/17) Try ordering by dimensions & get ones that are thinner.

The online parts book doesn't give deminsions or the standard oring number to go by. That is why I was trying to find the post I found the info in. It had info about the special toothed washer and a replacement inside tooth washer from McMaster Carr. Wish I could find that info. Could have been here or on Farmall Cub dot com

Bob · Dec 29, 2017

AS568-228 ring is 2-1/2" OD X 2-1/4" X 1/8" thick.

If the OD is correct, other off-the-shelf choices would be...

AS568-036, 2-1/2" OD X 2-3/8" ID X 1/16" thick.

AS569-141, 2-1/2" OD X 2-5/16" ID X 3/32" thick.

SA-140 Hydraulic Pump Body Square O-ring

RTR

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Phil Tibbetts

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