1990 Toro 26622, rear self-propelled with blade brake. Self propelled mechanism went out about 4-5 weeks ago, been pushing as the season is winding down. Gave it a good cleaning today as this might have been the last cut / vacuum of the year. Anyway, when raising the bale the transmission belt turns the pulley fine, can't see or hear any binding. I do see the transmission lift or rotate about the shaft so the cable seems to be doing what it is supposed to do. Does this mean the transmission is okay and I need to look at the output shaft or gears in the wheels? Guess I'm looking for a troubleshooting checklist. Thanks folks.