Hi, and welcome to MLMF. Just a thought, over time areas that cover moving parts can become clogged with dirt, grass and gunk, causing things to not work and move like they should. Maybe it could be something as simple as some debris stuck behind the wheel cover that wedges itself in place to stop the wheel. On your Toro, there's a "ratcheting" drive mechanism that may have become dirty and clogged up so that it won't spring free as it should. This parts diagram shows the area I'm talking about.
Parts and Diagrams for Toro Consumer 20018, 22" Recycler Lawnmower, 2002 (SN 220300001-220999999)
Parts #4, 14 and 15 are what engage to make the mower move.
Hope that helps.
Parts and Diagrams for Toro Consumer 20018, 22" Recycler Lawnmower, 2002 (SN 220300001-220999999)
Parts #4, 14 and 15 are what engage to make the mower move.
Hope that helps.