How do you change hydrolic fluid on a john deere 510 c backhoe?

To change the hydraulic fluid on a JOHN DEERe 510C backhoe, first ensure the machine is on a level surface and the engine is turned off. Remove the hydraulic fluid reservoir cap and drain the old fluid by opening the drain plug, allowing it to completely empty into a suitable container. Replace the drain plug, refill the reservoir with new hydraulic fluid, and check the fluid level using the dipstick. Finally, run the machine briefly to circulate the new fluid, then recheck and adjust the fluid level as necessary.