It jumps when you start to come up, where in the arc does not seem to matter. Now I think I could make it jump only once if I wanted to start at the bottom and make one full sweep to the top. But I am not sure how I will use a scraper blade or box blade when spreading rock or doing dirt work. It may be worth taking to to the dealer and see how much they would charge to pull the control valve and and adjust it to the factory setting. My understanding from reading on the web is they rarely find them set at what the factory manual says they should be and doing so will greatly improve operation. Some even got them adjusted under warranty. Bummer I bought mine used and its out of warranty. I notice when I played with it this afternoon that the 3 point control lever moves a ways then the 3 point jumps at once as if to catch up, that sounds like a control valve issue to me.
Its a neat tractor that is for sure, light years ahead of the 35 year old JD its replacing in operator comfort and layout. That said the john deer had a silky smooth 3 point control and dirt and gravel spreading was easy easy with it. The 3400 will have to have upgrades in this department or it wont be up to the task. Type l3400 3 point into you tube and a guy video taped his 3400 using a boom pole to lift a five gallon bucket of water, it jumps so bad it splashes water everywhere. In the comments under it a guy accused him of making it jump by working the lever quickly. No I can testify it is that bad if you got a bum one like the one that lives at my house, no matter how easy or slowly you move the lever. At this point I dont know of its a deal breaker on keeping the tractor but its a tough way to start a relationship
Maybe sell and look for a different model of orange. It might not cost me anything to sell and try again.
Thanks for all the help. SN