self propelling system got really slow

ccdk

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Sep 7, 2020
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I have a 10 year old Partner p53-875dwa with Briggs & Stratton engine.
Yesterday I hit one of the legs of trampoline in the garden by mistake and after that the self propelling system got really slow. It is still turning, will but really slow.
As an experiment, I started walking while the mower is on, then pulled the handle to activate the self propelling system, it feels like the system is putting a break as it is even slower than my walking speed.
Any idea what might be wrong?
 
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