How do you change hydraulic oil in bobcat 773?

To change the hydraulic oil in a Bobcat 773, start by parking the machine on a level surface and ensuring the engine is off and cool. Remove the hydraulic oil tank cap, then place a suitable container under the tank to catch the old oil. Use a pump or siphon to drain the old hydraulic oil completely, then replace the oil filter if necessary. Finally, refill the tank with the appropriate hydraulic oil, check the fluid level, and run the machine briefly to circulate the oil before checking the level again.