I have a John Deere 48 inch walk behind that the cutting blades don't always engage when the switch is pulled. After pull starting the engine when cold they will start first time, after running for a hour or so I will shut off the blades but not the engine. When going to resume mowing they may not engage with out waiting for awhile. Once the blades are going they run fine. This mower does no have a battery. I assume in order for the blade clutch to start it needs the proper voltage. There is what looks to be a capacitor? condenser? mounted on the frame behind the engine does this store electricity while the engine runs for a blade restart? So my question is why would the blades run fine when the machine is cold but not always restart after use, and what does the blade clutch need to engage? Any help would be great, Thanks Joe in New York.