D8 Drives Poorly When Hot

Could be, what model are we talking about??

It,s been years since I primed a torque so I checked the operators manual & it came back to me but first remove floor plate over the torque & open the vent valve on the upper area of the torque convertor housing & open up the cap on the main fuel tank to give it air.There is a crossover valve then in the system to open & put the scratched line on the turning part of the valve in a horizonal position. When the fuel runs out of the open vent valve with no air in it then close off everything & it should be ready to go.Upon starting the diesel the torque gauge should go to the normal white position of the gauge & if not the book says there still is air in the system so then I guess re-priming will be necessary again.

I don't know if this is applicable to your Cat or not. A friend of mine had an old Allis-Chalmers HD-16 with a fuel fed torque converter. According to him the machine ran fine, but when the fuel tank got too low the machine had no power. Hope this helps.

Phil a D8D is a 15A up to 15A1672 & then it is a 15A D8G.The operators manual tells all about bleeding out & filling the torque & yes there is a filter just for the torque.There is a couple other things it explains too. HB11 if you can find a operators manual book get the one listed for 15A 1 & up & it also covers the 14A.