How do you change the hydraulic fluid in a Nissan forklift?

To change the hydraulic fluid in a Nissan forklift, first, ensure the forklift is on a level surface and turn off the engine. Locate the hydraulic fluid reservoir, remove the cap, and drain the old fluid using a suitable container. After draining, replace the drain plug, fill the reservoir with the appropriate hydraulic fluid to the recommended level, and check for leaks. Finally, run the forklift briefly to circulate the new fluid, then recheck the fluid level and top up if necessary.