How does hydrostatic drive work?
Why does my mower lose power when it's going up hill?
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stllbrake1 this could be as simple as not having enough oil in the drive or even old oil. Now to get a better idea of what is going on, we would need your exact model mower. I believe that Craftsman uses Hydro Gear transaxles. Most of those take 20W50 motor oil. There should be a plug at the top of the transaxle where you can check the level, number 109 in the diagram is the typical location for those transaxels.
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