7040 oil transfer

Lots of questions.  It came to you doing this, correct ??   And how long has it been doing this??? I assume not since 1975 ??  Are you using genuine AGCO hydraulic filters (2) ??  I question whether any of the hydraulic lines/hoses are crossed ??  If it does the transfer in 8 minutes while roading it, does the same thing happen when sitting still at full throttle for 8 minutes ?? That would be nice to know. The shaft seal between the trans (gerotor) pump and the steering gear pump must be installed with the shaft splines wrapped with ONE layer of black electrical tape in a barber pole fashion. When oiled, this tape protects the seals rubber lip from being cut when sliding it onto the shaft. Both pumps must have good bushings and be in overall good condition. That seal has been installed backwards before and I think you should consider doing that. So, spring towards the rear.  An 8 minute transfer sounds suspicious to me.  I had a 7080 some 45 years ago that went the other way (rear to front) when reading and the top PTO shaft seal was in backwards (by some other dealership).

   I know on my 7020 gas passer I crossed the hoses when the new engine went in.Bless you Doctor for getting me to check. Problem solved.

You ran it 8 hrs at half-throttle with no transfer. I assume this was sitting still ??    I would run it at full throttle for an hour or less also sitting still and see what you've got. We have to keep consistent in the testing. I also assume going down the road for 10 or 15 minutes was at full throttle?? and this is when transfer did occur.  You didn't respond to the AGCO filters question. I'm telling you, this is important, especially on that left hand filter. An 8 mm door opening gap doesn't sound large to me. "Short" filters have always been a big deal when they aren't AGCO filters.  Also, after-market filters are sometimes too "fine" in their filtering and this also is bad as it causes pumps to have to work harder to get oil thru them. Does the power steering ever act or sound like it is cavitating? or struggling to get oil ??   From being hundreds of miles away, I'm all in for a new left hand ACGO filter and a door that opens 13 mm or more and a gerotor pump shaft seal installed backwards with the spring towards the gerotor pump. BUT, test it all FULL throttle sitting still !!! if it transfers at full throttle and not at half-throttle there is  (I believe) a high suction issue which pulls the oil thru the gerotor pumps shaft seal, but only at full throttle. Makes sense to me.