Mike,
Recently I rebuilt the H048G Rotary Mower on my 140. I replaced all six bearings, nine hub bolts and the bushings and bolts associated with the idler, and a few other odds and ends. My tally for the parts order at my dealer was around $122.00 give or take. It was money well spent. Over last winter I had already replaced the wheels, bought new blades and repainted and redecaled it. All in all I've probably got $200.00 in the "refurbished" deck. Good Luck with yours. You'll find a wealth of information here in the archives on dealing with the removal of the bearings, pulleys, and so forth.