DeWalt D55140

Troubleshooting Guide
This section provides a listof the more frequently encountered malfunctions, their causes and corrective actions. The operator or maintenance
personnel can perform some corrective actions, and others may require the assistance of a qualified DEWALT technician or your dealer.
Problem Code
Excessive air tank pressure-safety valve pops off ...................................................................... 1,2
Air leaks .................................................................................................................................... 3
Air leaks in air tank or at air tank welds .................................................................................... 4
Air leaks between head and valve plate .................................................................................... 5
Air leaks from safety valve ......................................................................................................... 6
Knocking Noise .......................................................................................................................... 6
Pressure reading on the regulated pressure gauge drops when an accessory is used ........... 7
Compressor is not supplying enough air to operate accessories .............................................. 8,9,10,11,12
Regulator knob has continuous air leak .................................................................................... 13
Regulator will not shut off air outlet ........................................................................................... 13
Motor will not run ....................................................................................................................... 14,15,16,17,18,19
Troubleshooting Codes
CODE POSSIBLE CAUSE POSSIBLE SOLUTION
PressUre switch does n0t ShUt off m0t0r when Compressor set the on/off Switch t0 OFF, if the Unit d0eS not ShUt
reaches CUt-OUtpressure Off contact a DEWALT factory service center ora DEWALT
! authorized service Center.
2 Pressure switch cut-out too high Contact a DEWALT factory service center or a DEWALT
authorized service center.
Tube fitt!ngs are not tight enough Tighten fittings where air Can be heaict escaP!ngl check
: fittings with soapy water solution. Do Not Overtighten,
15