Troubleshooting Guide; Troubleshooting Codes - DeWalt DXCMH1393075 Instruction Manual

This section provides a list of 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 D
your dealer.
Excessive air tank pressure-safety valve pops off ......................................................................1
Air leaks .................................................................................................................................... 2
Continuous air leak at unloader valve. ...................................................................................... 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
Compressor is not supplying enough air to operate accessories ............................................ 2, 7, 8, 9, 10, 12, 13
Restricted air intake. .................................................................................................................. 12
Excessive vibration .................................................................................................................... 14, 15
Knocking Noise ......................................................................................................................... 13, 14, 15, 16, 17, 18, 19
Excessive belt wear ................................................................................................................... 13,14,16,19,20
Squealing sound ........................................................................................................................ 13
Engine will not run ..................................................................................................................... 22, 24, 30
Moisture in pump crankcase ..................................................................................................... 5, 11, 23, 24, 25, 26, 27, 28
Pump will not run....................................................................................................................... 29
Air tank pressure will not build .................................................................................................. 29
CODE POSSIBLE CAUSE
1 Unloader valve does not release pressure when air
tank reaches blow-off pressure
2 Fittings are not tight

Troubleshooting Guide

Troubleshooting Codes

POSSIBLE SOLUTION
Unloader valve must be replaced. Contact a D
vice center or a D
Tighten fittings where air can be heard escaping. Check fittings
with soapy water solution. DO NOT OVERTIGHTEN.
26
WALT authorized service center.
e
WALT technician or
e
WALT factory ser-
e