I read the reply by MrFixAll and am intrigued. Mine is a 19.5 HP Craftsman with the hydro-static transaxle. Problem is slippage mostly after it warms up.
I had the Sears repair man out and he said there is no tension adjustment for the belt, which I thought was odd, but he's the pro, right? Is that correct - no tension adjustment?
Sears and other shops all say the transaxle cannot be serviced. Approx. 10 years old. Does the fluid deteriorate? There is no drain, there is not really a fill hole either, but rather what would appear to be a vent. If I drilled the case and replaced the fluid, what precautions would I have to take to get the air out of the system? Would I fill it from the bottom or from that vent-like gizmo on the top?