Hey rfarm1947, the Ford 575D typically requires around 16-18 GPM for the hydraulic flow. Make sure to check your manual for the exact specifications. Good luck with the snowblower attachment!
I agree with JohnDoe, you should find the information in the manual. Also, consider checking the pump type and flow rate if you're planning on using additional attachments frequently.
Consider reaching out to Erskine directly; they might give you the exact GPM requirements for their snowblower attachments. My setup required about 20 GPM.
Make sure you have the right connectors as well! Sometimes it's not just the GPM but the proper fit for the hydraulic lines.