After reading thru many post i thought i would dedicate this thread to those who have bought the new John Deere 800 pro series mowers, that are having problems with loss of power when blades are engaged, or mowing on a grade and need more power. i have a z810a that i am returning, simply put the machine has no nuts. 22hp with a 54 inch deck. so there preping a z820a for me but after reading some other post that machine seems like it does the same thing. i also have a z840a on order and am now very unsure if i should even take the machine off the lot. please post any problems with power loss on any of the new John Deere 800 Pro Series.