How do you bleed the air out of a hydrostatic trans on a international 3500A tractor?

To bleed the air out of a hydrostatic transmission on an International 3500A tractor, start by ensuring the tractor is on a level surface. Engage the hydraulic system by running the engine and moving the hydraulic controls through their full range, including forward and reverse, to circulate fluid and release trapped air. Check the fluid level and add more if necessary, then repeat the process until the transmission operates smoothly without any signs of air in the system. Finally, monitor for any leaks and ensure proper fluid levels are maintained.