The ornamental design for tractor dump container, as shown and described.
FIG. 1 is a perspective view of a tractor dump container showing my new design;
FIG. 2 is another perspective view thereof; and,
FIG. 3 is a side elevational view thereof.
The broken line showing is for illustrative purposes only and forms no part of the claimed design.
Phantom lining, where utilized, is for illustrative purposes only, and is not intended to limit the claimed component design to the features shown in phantom.