So I did a little more tinkering, and while I was able to attach a liquiduct to a harvester in a NEW world, if I transfer the world from my server to single player I still receive the crash. It happens whether the the machine is receiving power or not, has power stored or not, has a nearby chest for items, or even has sludge built up in the machine. I doesn't appear to be affected by dimensional anchors or even the side the liquiduct is attached to. Not sure if any of that information helps.