I once had an idiot bring back his Dixie Chopper in for warranty work, it was under a year old, and mysteriously ALL of his deak bearings were gone. I put the mower on the lift, and the whole mowing side of his deck was coated with thick grease splatter, and when you grabbed a blade, ball bearings bounced on the floor of the shop.
I called the customer, and asked him if he had been maintaining the mower properly. If he lubed the chassis, etc...
He sounded quite excited, "Yes, after every time I mow"!!!!!!