In the Army, we had no techs, so we turned everything over and restocked ourselves. Hearts were a pain, as we had to set up all the pumps, hot line, transducers, and pull all of our equipment (TEE, line kits, USD, drugs) ourselves that morning.
In my current practice, we don't have techs at our outlying hospitals, but the circulator will change the circuit and suction, and wipe the machine and cables down during turnover. Restocking at those hospitals is our responsibility, and several of my partners are lazy/ find it to be beneath them, so don't whoever comes after them needs to spend a couple of minutes in the morning ensuring they have what they need.