ya. I was going to try to get a picture but haven't had a chance yet...<img src="http://www.tractorbynet.com/forums/files/ls-tractor-owning-operating/447261-ls-xr4145h-losing-power-going-20151029_111658_resized-jpg"/> This is the top of the EGR valve.
I would check if you even have a EGR valve. I believe they have been added to meet the new tier 4 rules.I have a Montana 5720 I have been losing power putting out hay if there is resistance and I also noticed in third gear going up hill I lost power two so you think it could be the EGR valve