General Description The trimmer gear head is designed for efficient use with various Stihl brushcutters and trimmers. It allows you to replace worn parts for optimal operation of your equipment. Technical Specifications Includes: 1 x Trimmer Gear Head Replaces Stihl part numbers: 4137 640 0100, 4137-640-0100 Compatibility and Accessories Compatible with Stihl FR130T, FR350, FR450, FR460, FR480, FT100 Compatible with Stihl FS120, FS120R, FS130, FS130R, FS200, FS200R, FS240C, FS240RC, FS240CE, FS250, FS250R Compatible with Stihl FS44, FS44R, FS25-4, FS65-4, FS74, FS80, FS80R, FS85, FS85R, FS85T, FS85RX, FS87, FS87R, FS100, FS100R, FS110, FS110X, FS110RX Installation To install the gear head, follow these steps: Turn off the unit and unplug it if necessary. Remove the old gear head. Attach the new gear head, ensuring it is securely in place. Reconnect the unit and test its operation. Use This gear head is used for clearing and mowing tasks, providing stable and efficient performance for