Craftsman 320.27990 Operator's Manual page 16

PROBLEM CAUSE SOLUTION
The Impact Wrench is Plug the wrench into
The Impact Wrench
not plugged into a power an appropriate power
does not work
source source
Socket cannot be
installed Improper socket selection Use a suitable socket
Clean and clear vents.
Cooling vents are
Motor overheating obstructed Do not cover vents with
hand during operation
27990 ManuaLRevised_iO 1202 Page i6