If its hydrostatic, you have wear issues in the unit, this will get worse when it is hot due to the oil becomeing thinner, and leaking between the cylinder block and the centre section in the gearbox, this is either a replacment box or a rebuild, replacment box is going to be expensive, so rebuild may be the cheaper option.Make sure the brakes are not binding, and the unit is clear of grass and debris, also make sure the cooling fan is working ok
Husqvarna man
June 2010
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