hi StedDoom;
You've indicated you've got a vlookup that retrieves the information so my code assumes you know the values you want to enter into the note field.
So for demo purposes i've just hardcoded in the equipment and serial number
Without sample sheets this is about the best I can do 
Private Sub Worksheet_Change(ByVal Target As Range)
'IF Cell in column A AND only single cell changed AND cell has value
If Target.Column = 1 And Target.Count = 1 And Target.Value <> "" Then
Call addComment(Target, "D10 Dozer", "123456789")
End If
End Sub
Public Sub addComment(targCell As Range, equipment As String, Serial As String)
Dim note
'BUILD NOTE
note = "EQUIPMENT:" & vbNewLine
note = note & equipment & vbNewLine & vbNewLine
note = note & "Serial #:" & vbNewLine
note = note & Serial & vbNewLine
'ADD NOTE TO CELL
With targCell
On Error Resume Next
.Comment.Delete
On Error GoTo 0
.addComment (note)
End With
End Sub
if this has helped please consider clicking "add reputation", thx 

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