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Help needed to install new Eagle Hitch piston cup

1

1950CaseVac

New User
I just got a new piston cup for my 1950 VAC Eagle Hitch from my local Case dealer (part A30798). I understand how to center the cup by inverting piston in cylinder. The problem is the new cup is made of hard rubber/fiber and is 0.12 inch larger than the cylinder. Cylinder is 3.75" and OD of new cup is 3.87". I can't even put cup into cylinder inverted (small end diameter of cup into cylinder first) as it gets stuck about half way. I just can't see how to get this installed. I thought about a piston ring tool, but can't get the compression needed on the lip of the new piston cup. I also tried to "soften" the lip of the new piston cup by rolling edge on my work bench. It's still very stiff. I'm about ready to take this $38 part back to Case because I think the Taiwan company that made it made it too large. And yes I did apply hyd. oil to cylinder, piston, and cup.
 
I had to soak a leather one in hot water to make it more pliable. It swelled up some but went in, I don"t it would have otherwise. Don"t know if that will work on your composite.

Joe
 
Thanks Joe. I did put the composite cup into hot water and then stuck it inverted into the cylinder without the piston and plate. The hot water did soften the cup temporarily and just long enough to get it in. When I put the piston/cup/plate together with loose bolts inverted into the cylinder, I couldn't get it in. Used my caliper to determine that the plate was the problem - it was larger than the space inside the cup. So I put a bevel on the plate edge facing the cup. That solved the problem. Getting the assembly started in the cylinder was a challenge, but once in I was able to drive it down. Tested it and it works well. Just FYI,thought I'd include the photo I posted on this site back in 2000 when I did the restoration.
a11631.jpg
 
That is a very nice looking tractor. Very good info to keep in mind on that center plate if I ever need to change another cup type. Mine is a "53 with the o-ring piston, fast & easy changeout.

Joe
 
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