This model type features an integrated motor/transmission assembly with a DC motor and electronic speed control. Factory bowl capacity is six quarts for the KSM6573 (“Professional 6000 HD”), 7 quarts for the Pro Line, and 8 quarts for the Commercial.
The Pro Line and Commercial use the use the same bowl cradle as the KP26 model type and can therefore use smaller bowls that use the same bowl cradle. Model numbers include KSM7581, KSM7586, KSM7588, KSM7990, KSM8990, KSMC895.
The Professional 6000HD (KSM6573) uses a unique bowl and accessories, and a mid-width cradle. This can be upgraded to the wide cradle to allow the use of currently available bowls and accessories. Alternatively you can use the 5qt mid-width bowl from the Professional HD and its compatible accessories.
The integrated drive unit is considered maintenance-free; there are no maintenance or repair parts or procedures.
KitchenAid: Commercial Stand Mixer user manual