How do you change hydraulic fluid in ford 340 b backhoe loader?

To change the hydraulic fluid in a Ford 340B backhoe loader, first, ensure the machine is on a level surface and the engine is off. Locate the hydraulic fluid reservoir, remove the fill cap, and drain the old fluid by opening the drain plug. Once drained, replace the drain plug, refill the reservoir with the appropriate hydraulic fluid, and check the fluid level with the dipstick. Finally, run the machine briefly to circulate the new fluid and check for any leaks.