Yes there will be a belt from the engine to the cutter deck, it sounds like it has come off the pulleys or has broken, the mechanism you can see moving either tightens or slackens the belt to create a clutch, tipping the mower is not a good idea, fuel leaks, oil leaks, battary acid leaks, if you have a set of car ramps drive it up onto those.
Husqvarna man
July 2010