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While mowing, the deck will just stop after mowing 20 to 30 min into mowing. The engine never stops just the deck

WELCOME to LMF...

I take it it is an Exmark... what one???
:smile:KennyV

Most likely it's the clutch, the wiring or the PTO switch.
I would change the switch first, as it is an inexpensive part.
The clutch normally sells for around $260 and the switch about $15.
Good Luck...

Test the switch,then ,if test ok,hok it back up and test at the clutch,test ok there ,its going to be the clutch