hydraulic leak

My 7600 Ford has a hydraulic pump bolted to the right side of the transmission housing. When I purchased the tractor, there was a leak from the attachment point. Two of the bolts were stripped out. I removed the pump, drilled, tapped, and helicoiled the stripped holes, replaced the gasket and O-rings, and re-bolted it on torqued to specs at 40#. It still leaks so I am suspecting a slight warp in the casting. (Thus why the bolts were stripped out the first time).Has anyone had good luck in this situation with permatex or other brand gasket material? Thanks in advance for suggestions.
Bob seND

Get a Flat board similer to the ones used in a body shop. Remove pump and sand off the housing until you get it good and flat in that spot.
It may take some time, but, I am sure you will be happy with the results.
Gary

Try posting this over on the ford board. if you are lucky, Rod or Rick will see it and may have some other sugestions too.

soundguy

I agree with Gary, If the surface is complex and cannot be flat sanded, use a second cut mill file to make it flat. be careful not to file on the part of the surface that is not bent. Do not go beyond flat, as it will then break the ear off. The use of a metric Oring that is a tiny bit bigger in section diameter will also make it seal better. JimN

Uffff.
I can't imagine why the casting would be warped. I'm not saying it couldn't happen, but why?
The first thing that you have to realise about taking a file to something is that the mating surfaces and the thickness of the gasket set the backlash in the drive/driven gear on that pump... so filing could change the backlash. Not good.
I think I'd inspect it really carefully for cracks or distortions first. Get a precision straight edge on both the housing and the pump and see if they're straight.
Other than that I'd suggest that you look in your parts book for the pump breakdown with the gaskets and seals for that joint and see what's there and how it goes together. It seems to me that there's a couple stupid little rings that go on the suction tube, and it also seem to me that they might hang up once and a while if you don't get things just right. Be sure you don't pinch the gasket when installing the pump too.
If you don't have a parts book then go to newholland.com/na and look in the parts section. All parts listings are online.

I'd suggest doing that before you start filing anything because if you do later find the real problem to be something other than a distorted part... then you've got a filed part that will no longer fit anything.

Rod

Try plastic gasket made by Locite.John Deere crawlers use it on final drive where bolts up to rear end housing.

I have NO idea whether this would work... but if you put plastic wrap on the housing and the frame, then smeared some JB weld or other cold welder all around the housing area then attached it and bolted it on but only light torque... wouldn't that make a metal gasket that would even things up?

I's probably be to chicken to try it but with the plastic wrap between both mating surfaces it shouldn't bond like glue... after it dried then torque it down. I sure would think twice about filing the housing down... Clearances could be an issue but then I suppose if you barely filed anything.... risky.