Hoover spinscrub 50 had a grinding noise and then stoped working

Where is the belt

The filter is at the top of the recovery tank (dirty water tank), should be replaced when dirty or odors occur. as to your motor, there is no way for an end user to remove any cover and check it. If you are experiencing noise, have it checked by an authorized service center.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

Replace the switch.
http://www.ereplacementparts.com/hoover-f5914900-steamvac-with-clean-surge-parts-c-37315_37419_37425.html

click here > http://hoover.com/file/604/ for the instruction manual,

There are no belts lol. Its a carpet shampooer

http://www.fixya.com/support/r4530769-diagnosis_fix_hoover_steamvacs_when

The motor sounds bad. Use the Hoover web site to locate a shop near you for warranty repair. hoover.com

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

Take out the brush block and see if it will power on, if not then probably your motor has gone bad.