The loud buzzing is the new solenoid you fitted. Have you fitted it properly? Is the motor trying to go but can't because something is holding it back? Motor should be ok. They are fairly good motors and don't fail often. Hardly likely that a motor and a brake solenoid would both fail together at same time. Hold the brake lever out by hand and turn the pulley to see if the drum turns freely.
Linoln Appliance NZ, July 2013