The ornamental design for hood portion of a tractor, as shown and described.
FIG. 1 is a front view of a hood portion of a tractor showing my new design;
FIG. 2 is a reduced left side view thereof;
FIG. 3 is a reduced right side view thereof;
FIG. 4 is a reduced top plan view thereof;
FIG. 5 is a reduced right front perspective view thereof;
FIG. 6 is a reduced left front perspective view thereof; and,
FIG. 7 is a reduced right front perspective view illustrating the hood portion of a tractor in its environment.
The area in FIGS. 2, 3 and 7 having a stippled texture and outlined in dashed lines is intended to show the environment of the subject invention and is not part of the claimed subject matter.