I had the exact same issue. When self-propelled the mower would still move, but rolling it backwards the rear wheel would get stuck. Mine was caused by a small rock that got lodged in the grooves inside the rear wheel. Take the wheel off and make sure there's nothing blocking the grooves.
The rear wheels are locked to the drive train. To pull or push the mower, you must pull out the release probably at the back of the mower, near the transmission.
Gary
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there is no manner of drive train release. this is the yellow deck so called "pro" series 21' walk mower. the drive system engages via a belt when squeezing a lever, which when released should allow the wheels to move freely (as it did when it was new). a push mower cannot operate otherwise. i was thinking perhaps the transmission may have an internal loose pawl with a busted spring since the problem occurs 80% of the time.
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