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pull both rear wheels off and clean the half moon shaped key you will find on the drive shaft gear that turns the wheels, you will need snap ring pliers to do this properly and clean the small springs under the half moon key you find so they operate freely DO NOT use grease in this area wd 40 or nothing works fine once they are clean, also check for wear on the parts
The self propel system uses a type of racheting pinion drive that sometimes gets greased up and wont release like it should.
You would need to remove the wheels and pinions and look at the shaft ends for a key, a ball and a spring. This is the "pawl" that locks the wheels going forward and rachets when the wheels go backwards.
Clean up the parts of all the aluminum colored grease and reoil with something lighter. 3 in 1 would do nicely. Reassemble.
Now the next time you start going backwards and it jams...just push the mower forwards slightly without engaging the drive and see if the unit doesnt free itself.
Rear wheel drives like this have pinion gears with rachet pawls that allow them to go backwards freely while locking when the transmission drives them.
You need to take off your rear wheels and carefully remove the pawls. They look like little squareish metal shaft keys with springs under them. You should notice that the keys or pawls are covered in what looks like grease.....which is actually worm metal from the pinion gear and oil mixed together to form this pastey greasey substance. Clean all that stuff off and lightly oil *( light oil...3 in 1 kind of oil) and reassemble.
You should hear the nice clean clicking of the rachet pawls as you roll backwards again!
Typically self-propelled mowers are propelled using the front wheels, which only turn forward. Pulling the mower back while the front wheels are turning will damage the drive gears. It's best to raise the front wheels slightly off the ground before pulling back.
on yours you must replace the entire tranny unit - to make it roll you can remove the front wheels and remove the small gear on both sides - doing this of course will turn it into a push mower not self propel