How do you change hydraulic oil on a John Deere 6675 skid steer?

To change the hydraulic oil on a JOHN DEERe 6675 skid steer, first, ensure the machine is on a level surface and the engine is off. Locate the hydraulic oil reservoir, remove the drain plug, and allow the old oil to completely drain out. Replace the drain plug, refill the reservoir with the appropriate hydraulic oil, and check the oil level with the dipstick to ensure it's within the recommended range. Finally, run the machine briefly to circulate the new oil, then recheck the oil level and add more if needed.