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Sub ChangeDefaultPFName()

Dim Wks As Worksheet
Dim PT As PivotTable
Dim PF As PivotField
Dim Title As String
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'written by Angelina Teneva, September 2016
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

For Each Wks In ActiveWorkbook.Worksheets
    For Each PT In Wks.PivotTables
        
        On Error Resume Next
        For Each PF In PT.DataFields
                Title = PF.name

                'comment out the line(s) that you do not need
                PF.name = Mid(Title, 8, Len(Title) - 7) & " "   'removes the "sum of", "max of", "min of"
                PF.name = Mid(Title, 10, Len(Title) - 9) & " "  'removes the "count of"
                PF.name = Mid(Title, 12, Len(Title) - 11) & " " 'removes the "average of", "product of"
        Next PF  
    Next PT        
Next Wks
End Sub