If I recall, I believe the pumps are rated at around  25 gal min. You should have the case drain for the return line off the planter fans - it would work much better, with less heat build up on the oil. The system is noise, but it doesn't hurt anything. I think larger pumps could be installed if more hydrulics are needed. A pto pump would be less expensive I'd guess. Speak with your sevice advisor at your local dealer for better detailed advice.

As Pudding indicated, those series of tractor were some of the best and advanced from that time period -