Not a LLY DMax question but I'm not sure where to post. I tried on a tractor site without help.

I have been moving stuff around with my JD4700 and a couple of times I have lugged the engine down. It then either stalls or drops to a very rough idle with lots of smoke. Almost as if it was running only on one or two cylinders. At first I tried to get it to start running right with feathering the throttle, ect to no avail.

I was afraid to shut it down thinking it wouldn't start. In fact it was the oposite. I couldn't get it to run right but by shutting it down it restarted immediately and ran fine.

What did I do? and can anyone explain how this works on a diesel? I can't seem to figgure it out.

I keep thinking it must be due to disrupting the normal spont. combustion?

Thanks

You must be lugging it really far down? How far exactly? If you get below 1800 they will have a hard time coming back because 1800 is when peak torque starts. The manuals say operating rpm under load should be above that I think. I have lugged tractors down hard and they always pull back unless you don't let them. Maybe you should go down a gear. Still that doesn't answer why it would run rough, unless you went really low. Not sure on that...