Case man seeks advice from Hyraulic expert.

Have a 49 SC Case with Single valve control pump. I understand that this pump is supposed to have down pressure. It is not for a three point or eagle hitch.

I installed a working cylinder (mounts on left side of tractor), and a lift bail. The cylinder has two ports. When I hook this up one hose to left of pump (lift up) and one hose to right of pump(lift down), I only get a few ups and downs before the pressure builds on right side so as to "freeze" the system. I understand that that each side of this pump has an output and a return valve. It seems that the return valve is not working or something. The only way I can use this cylinder and bail, is to plumb the left side of the pump back into resevoir to get relief and block of the lower port on the working cylinder.

This method works okay to lift and will go down with natural weight, but I have NO DOWN PRESSURE. Sure would like to have that.

Can anybody on this site tell me what's going on or better yet, what's not going on with the pump?

I have posted a number of times recently on the Case Forum under the handel "Casekernel" if anyone wants a history of my struggle before attempting advice, it might help to read those postings. I've tried whatever has been suggested there, but no resolution to the problem to date.
Viva La Allis Chalmers!!

Going to a tractor show tomorrow in Le Sueur, MN where theAllis tractor is being featured. We had both Allis and Case on our farm when I was growing up.

If you have a four way three position valve, you will need to study the ports to determine which is the sump port - in the center position it is connected to the pump port. I usually figure out the ports before connecting the valve by blowing air in the ports.

If your tractor is an 49 Case, I would expect your valve to be a three way three position. You must have a 4 way 3 position valve.

Been a while since I used these terms (3 way etc) but I am confident of the description of the way they work.

There are a couple of pictures from the arhives under the name Mike Schotte with a brush hog attached. Although the pump is very greasy, it appears that he has plumbed from either side of the pump to the work cylinder with no hose going up under the seat where the resevoir filler plug or T as I have to do to get my pump to work. The posting date is 12-11-2003.

You mention a check valve that is unseated by a "push rod". I had the valve head off and I did not see such--could it be missing on the right side? For some reason the oil is not permitted to flow back, as I think it should. There seems to be only one main cylinder that goes back and forth actuated by the lever itself for directionality.

You seem to be familiar with this pump. I guess my main question is, if this pump is designed to work double action--why isn't it?

I was at a tractor show today and saw similar pump and work cylinder on a DC. The owner could not answer my questions, because he doesn't use the lift. It was his dad's tractor and that information was not passed on from his deceased father.