I’m using the method “clearGridData” of “jqGrid 3.8 ” to clear all data, but not clearing the “Navigation layer”.
$("#MyGrid").jqGrid("clearGridData", true);
Thoroughly clean the grid, but leaves the “Navigation layer”:

update
change “paging toolbar” by “Navigation layer”
Use
$("#MyGrid").jqGrid("clearGridData", true).trigger("reloadGrid");