To replace the trimmer line on the Yard Force YF22HWT High-Wheeled Gas String Trimmer, follow these steps: 1 - Turn off the engine and disconnect the spark plug wire for safety. 2 - Access the trimmer head – Flip the unit on its side so you can see the cutting head. 3 - Remove the old line – If any remnants of the old line are still in place, pull them out from the eyelets. 4 - Cut new line – Use 0.155-inch diameter trimmer line, and cut two equal lengths (typically around 23"–25" each). 5 - Insert the line – Feed each piece of line through the holes in the trimmer head, pushing until they come out the opposite side. 6 - Center the line – Pull both ends so the line is even on each side. 7 - Secure the line – Wind each end into the holding notches or clips (if present) to prevent slippage during startup. This model uses a fixed-line head, so you don’t need to wind the line around a spool—just insert and go. For a visual reference, you can check out the official operator’s manual, which includes diagrams and maintenance tips - https://www.manualslib.com/manual/1934447/Yard-Force-Yf22-Hwt.html