hoover washing machine 630 is not spinning?

my washingmachine Hoover 630 has stoped spinning but runs through the cycle and does wash . when i set it to spindry the dum does not turn and the reset switch trips. it seems the hydraulic only adjetates but does not free it to spin. the hydraulic lifts off the brake but does not let the drum spin only adjetation is working even in the spincycle. i took the belt off and the motor works fine . how do i free the spin from the adjetation mode?( i think it is inside the hydraulic )