Craftsman 320.66810 Operator's Manual page 24

PROBLEM CAUSE SOLUTION
The Impact Wrench Battery is depleted Charge the battery
does not work
Bits can not be installed Does not use the proper Use suitable adapter
adapter
Motor overheating Be sure cooling vents Clean, clear vents. Do
are free from dust and not cover with hand
obstacles during operation
66810 Manual_Revised_09 0407 Page 24