[cmatthew]

did you check the lawn for hydro fluid. was probably dumping it out while you were mowing. i believe the manual says 7qts to fill. and also its says in the manual that the pump needs to be primed if its run dry. the draw/cooling tube needs to be filled to get the hydro pumping again. i would take a syringe with a hose/tube attached to it and run it up that cooling tube and pump oil to the hydro that way than fill it up and try. i cant say if yo damaged it or not. soemone with more knowledge on it will chime in soon. good luck