My 16 year old 21" Self-Propelled Model #12A-979L401 rear drive wheels lock-up when pulled backwards. How can I tell if the transmission releases? I took the belt cover off and replaced the belt, although I didn't see anything wrong with the belt. I know the transmission is sealed but is there away to check the lubrication in it? After 16 years it may need some lube. All suggestions appreciated.
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