DeWalt DWMT70777 Instruction Manual page 11

This section provides a list of the more frequently encountered malfunctions, their cause and corrective actions. The operator or maintenance personnel can
perform some corrective actions, and others may require the assistance of a qualified
Defective Pattern Likely cause
Inadequate 1. Air needle partially
air delivery closed
2. Dried material in air
jets or air cap
3. Obstruction in air line
Excessive fog 1. Air pressure too high
for viscosity of fluid
Material leaking 1. Loose cup or
from fluid inlet foreign substances
of cup. on/ between cup
thread and fluid inlet
Material leaking 1. Worn fluid needle
from nozzle when
2. Dried material in tip
trigger is released
of nozzle
3. Loose packing nut
TROUBLESHOOTING GUIDE
D
Suggested remedy Defective Pattern
1. Open control knob
A.
2. Clean
3. Remove obstruction
1. Reduce air pressure and/or
open fluid control knob
B.
1. Tighten and clean
or replace it
1. Replace
2. Clean
3. Tighten needle
packing nut by turning
counterclockwise
11
WaLT
technician or your dealer.
e
Likely cause
Dried material is
clogging side-port "A"
and causing
side-port "B" to blow
spray towards the
clogged side
1. Dried material at
fluid nozzle "C"
restricts air flow
2. Loose air nozzle
3. Air pressure
set too high
Suggested remedy
Soak side-ports in
A
thinner to clean clog.
Do noT poke any
opening with hard objects.
B
C
1. Remove air nozzle.
Wipe off fluid tip using a
cloth soaked in thinner
or by soft brush
2. Fasten nozzle securely
3. Reduce air pressure