How do you change gland packing of pump?

To change the gland packing of a pump, first, ensure the pump is shut down and depressurized. Remove the gland nuts and the old packing material from the stuffing box. Clean the area thoroughly, then cut new packing to the appropriate length, wrapping it around the shaft without overlaps. Finally, reassemble the gland, tightening the nuts evenly to create a proper seal without excessive pressure on the packing.