Hey everyone, new to the thread and new to Troy-Bilt. I recently purchased the 12A-562Q711 on a Facebook resell site. After the first use, engine worked great but the self propel stopped working 15 minutes in to mow. Typical used mower, right? I opened it up, saw the drive belt had slipped off the pulley and had some wear, so I replaced it. The self propel began working again, sort of. Very sluggish, just inching along. I noticed that the transmission and pulley connected had some wiggle room, making the belt pretty loose. When I pushed down on the transmission, the drive belt tightened, but the Tension Spring was no longer resting on the body of the mower. To test my theory i slid three pennys below the Belt Tension Spring which held the transmission forward and tightened the belt. Self Propel worked perfectly. After spending some time with the spring, it looks like its fixed and can't be replaced. Even if it could, is that the issue or is there something else I can tighten? Any one have any better ideas than my 3 cent fix? Thanks in advance!