Hydraulic fluid entering engine when using three point attachments under load

[Theobuck]

Help please! I recently bought a used Iseki TU 180 4x4 compact tractor and have been having problems with hydraulic fluid filling the engine crank case when using the rear 3 point setup. The seller took the hydraulic pump and had it rebuilt but the problem reoccurred soon after. I did some trial and error to get more information and switched some hoses around on the 3 way spool and thought I narrowed it down to to left (inside lever). I replaced the spool assembly along with one of the feeder hoses and thought it was fixed. Alas, after using the box scraper and loader quite a bit with no issues, I installed and post hole digger on the rear and began drilling fence post holes and the case filled up again. I did get the auger stuck a couple times and loaded the 3point pretty hard. Any advice on that to try next would be awesome!

 

[CCWKen]

I'm not familiar with Iseki tractors but I don't see how that's possible unless the hydraulic pump is attached to the engine block and the pump is leaking. Does the tractor have any oil coolers that may have been miss-assembled?

 

[ozzie tractor]

^^^ yep front seal on the pump is blown and pushing oil into the timing gears.