Kubota L3400 3PH

The 3PH on my L3400 jerks when lifting. No matter how slow I move the lever it does nothing then jerks up 2 or 3 inches. Goes down smoothly. I've
tried adjusting the knob under the front of the seat but that only affects lowering speed . Anyone else have this problem? I'm not too impressed with this machine. My L2850 is twice the tractor and rated the same HP. Don't like the front exhaust either. I've been told by others that Kubota quality has slipped in recent years.

Search jerky 3PH. There are hundreds of posts. It is a common, unaddressed problem with the L34-3800 tractor