The ornamental design for excavator steps, as shown and described.
FIG. 1 is an upper front right perspective view of excavator steps showing our new design in use condition.
FIG. 2 is an upper front right perspective view of excavator steps.
FIG. 3 is a right side view thereof.
FIG. 4 is a left side view thereof.
FIG. 5 is a front view thereof.
FIG. 6 is a rear view thereof.
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The claimed design is shown in solid lines in the drawings. The portions of the drawings shown in broken lines form no part of the claimed design. The portions of the drawings shown in broken lines having unequal segments illustrate the boundary of the claimed design and form no part of the claimed design.