The clutch is just an idler pulley which tentions the belt via a spring, there is no real adjustment, firstly change the belt, check there is adiquate tention on the belt when the clutch pedal is released, check the brake is not binding in the gearbox, if it is a hydostatic box check the by pass lever is fully in, if all else fails it could be an issue in the box itself.
Husqvarna man, April 2010
