I would say cylinder piston valves or seals on piston. One bad cylinder and the dozer will leak down symetrically, you can't tell which by looking at it since the oil will equalize through the T connections in the lines where they divide to go to each cylinder.
If you have a diverter valve on the fender, you can lock it off and take the #44 out of the picture if it still leaks down with the diverter turned. If it holds with the diverter locked off, I believe that eliminates the cylinders as the source of the problem.
You can try to identify which one by raising the dozer blade and then shutting off the engine so you can hear/feel the lines and the cylinder for moving oil. Also can cap off the lines if you can find some kind of caps. Have to have a jack or hoist to do it that way to allow you to take the lines loose and install the caps before letting the weight go on the cylinders.
Good ideas. Thanks for the tip. I'll try the fender valve first and see if the cylinders still seep.
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