I have a 2016 36" Gravely Pro Stance. Model 994131 serial # 000177. Every so often but not every time, when I go to turn the blades on, the spring pops off the tensioner pulley. I am going to post some pics below. The belt appears to be in good condition without any tears or wear marks. The manual has limited info and only really says how to replace the belt. Does it sound like after 1 year and 80 some odd hours of operation that the belt has naturally stretched out and more tension...
Gravely Pro Stance spring popping off
Gravely Pro Stance spring popping off