The ornamental design for a three-point hitch mounted dump cart, as shown and described.
FIG. 1 is a right, front perspective view of the three-point hitch dump cart, containing the principles of the instant invention;
FIG. 2 is affront elevational view of the three-point hitch mounted dump cart shown in FIG. 1;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right side elevational view thereof, the pivotal movement of the dump box being shown in dashed lines, the left side elevational view of the three-point hitch mounted dump cart being a mirror image;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a lower, right, rear perspective view thereof.