It looks to me like it was used without the cone-shaped support and primary filter cone.   The motor will need to be disassembled and cleaned.  Why someone would remove the cone is beyond me.  The disk filter at the base of the motor is supposed to be a stop-gap to protect the motor in case the main filter develops a small leak, but can't be expected to handle a full onslaught of dust and dirt. 

I'm not familiar with this model (yours is the first I've ever seen) but it also looks like there a missing "elbow" piece at the top of the power nozzle wand before connecting the hose. 

Buying genuine Filter Queen parts from an authorized FQ dealer is a very expensive proposition.   Some parts can be found for less online.  The most important issue is taking apart the motor to get cleaned out and assess any damage from being run cone-less.