Not sure on how easy or hard the fix would be, but it looks like a compression type or flair fitting on the line side. The fitting where it goes into the pump is an oring base type. See illustrations.
Try tightening or take off and look for a crack in the line. If this is the return line, you may be getting air somehow through that fitting. Likewise, if the fluid level is low, the pump will cavitate, pull in air, and cause the bubbles and whine.
Fitting number try 354469X1. Line number 1680493M92 for serial number J31062 or 0014638U91 for serial number J31063 and up. At least that's what sows up in AGCO parts list. Lots different lines, pumps, and such, but those look like what matches your photo.
Fitting number try 354469X1. Line number 1680493M92 for serial number J31062 or 0014638U91 for serial number J31063 and up. At least that's what sows up in AGCO parts list. Lots different lines, pumps, and such, but those look like what matches your photo.
