You should check your machine’s agitator clearance regularly. If it touches the bowl, this can do damage to the bowl itself and different components inside the unit. In some cases, the bowl clamp might not be closed or improperly adjusted. Here are standard instruction for readjusting the attachments on Hobart mixers:
Step 1 – Unplug your mixer.
Step 2 – Remove the apron by unfastening the thumbscrews.
Step 3 – Adjust the stop screw on the unit by loosening the bottom locking nut and turning the stop screw. Turn it counterclockwise to increase clearance or clockwise to decrease clearance. Tighten the locking nut as you hold the stop screw.
Step 4 – Place the apron back on, and secure it to the unit by fastening the thumbscrews.
Step 5 – Plug the mixer back in. Check the adjustment by operating the bowl lift a few times. Make sure to check your manual for the mixer’s proper maximum clearance.