I have the Case version of WT, SPX3185.  With some hills, it does not have enough power, just plan nozzle sizes to go 8mph instead of 14mph.  I think mine is a 1999 model.  No problem with parts.  I only put on about 150 engine hours a year.

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IMG_1622 (full).JPG (152KB - 7 downloads)

Spraying 003b (full).jpg (129KB - 7 downloads)

IMG_3230b (full).JPG (121KB - 10 downloads)

IMG_3224b (full).JPG (105KB - 8 downloads)