770B Loader Hydraulic major leakage

[Chris 1510]

I'm new to tractor ownership and I just got a Ford 1510 4WD tractor. I'm using it on a farm near Philadelphia, PA. After 1 hour of use it started spraying hydraulic fluid from just below what I think is the hydraulic pump on its 770B loader. The previous owner said he had to replace an O-Ring in the area. Where should I go for manuals, parts and just pain ole help running this ole girl. Please help?!
Thanks, Chris