Case 580B hydraulic/front loader issue

Let me start by saying this 1970's era machine sat for an unknown number of years (guessing 10 or so), I have owned it for 15 months as of this post date. Total basket case, engine was seized (a story of its own) and numerous other problems.

It is a playtoy project and so far I have rebuilt the engine, replaced needed hoses, all fluids and filters changed throughout, have 4 of the BH cylinders at the shop for repacking (all glands frozen), and a lot of other repairs.

The issue I am having...

Case 580B hydraulic/front loader issue

Case 580B hydraulic/front loader issue