If the self propelled feature on your lawnmower is not working, then the first thing you should check is if the cable that runs from the handle bar down to the transmission box is damaged. This cable overtime can get damaged to due mechanical wear and tear. Once you have located the cable, look out for any signs of rips and tears. If the cable has rips and tears, it can't make the transmission box drive the wheels properly, so it will need replacing. As well as checking the cable that operates the self propelled wheels, you should also make sure the hooking mechanism, were the cable is attached is not broken or unattached from the cable.
If the cable and the hooking mechanism is not damaged or faulty, remove the transmission cover and check if there is any leaves or wooded twigs or grass that can make the transmission clog itself. These things can cause the transmission to not drive the self propelled mechanism, as they can prevent the engine to drive the wheels.
If the transmission is not clogged up, make sure the there is no excess in-between the wheels and gears, that are related to the self propelled mechanism. Sometimes there can be grass that can get on top of the gears, or stuck in the sides of the wheels which can stop the wheels from spinning.
Also check if the blade underneath the lawnmower is moving freely and remove any excess grass around it, to make the blade work to its optimal performance level. You are probably thinking to yourself that' what is a lawnmower blade got to do with the self propelled mechanism?' Well, some lawnmowers that have self propelled wheels, are driven by the blade.
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