First of all, remove the plastic cover on the rear so that you can access the transmission. Check if the belt is fairly tight. Run the mower and operate the self propell, then watch the belt closely; is it slipping? If not, the problem may be in the transmission. If the belt is lose and slipping take a look at the manual below for instructions on how to tighten it.
Take a look at the manual at the following link: Service
Hope this helps!
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