Wash and pat dry mangos. Cut the fruit no thicker than ¼ inch. Preferable at ⅛ inches. Remove skin with a paring knife and discard the pit.
Place in a single layer with at least 1 inch between pieces so that the air flows freely amongst the fruit.
If your dehydrator doesn't have a "FRUIT" Setting, the temperature should be set at 135 degrees to 145 degrees. The process usually takes about 3.5 to 4 hours, depending on the thickness of the slices.
When it's done, I usually turn my dehydrator off and just let the fruit rest there inside the machine to cool and dry for several hours or overnight.
Video
Notes
Fruit should be uniform in color, not too sticky, and chewy. For best results, store in the refrigerator.