Graco HVLP EDGE II Operation - Repair - Parts page 25

Problem
Solvent pops or bubbles
No or slow fluid flow,
intermittent spray, or
fluttering spray
Fluid leaks at fluid nozzle
after trigger is released
Poor spray pattern
3A4980B
Cause
Sprayed surface drying before
solvent gas can be released
No material
Trigger pin in UNLOCK position
Wrong size fluid set being used
Gun fluid nozzle blocked by dried
paint or damaged
No cup pressurization
Cup fitting or siphon tube (in
siphon cup) blocked by dried
paint or is damaged
Air flow to cup blocked
Fluid in the check valve (siphon
cup only)
Plugged material strainer
Needle packings not properly
adjusted.
Note: Fluid loss through
packings affects fluid pressure
and causes a fluid leak from gun
body.
Needle not seating in fluid nozzle Check for a loose fluid nozzle or a
Packing nut is too tight
Air cap horn hole and/or fluid
nozzle plugged
Troubleshooting
Solution
•
Apply fluid in lighter coats to
allow for proper evaporation.
•
Use the recommended
thinners.
•
Follow the solutions for
Orange Peel Finish, Paint
Droplets Too Large in this
Troubleshooting Table.
Check cup for material, see Startup,
page 12.
Check trigger pin location. Must be in
SPRAY position.
Select proper fluid set for fluid being
sprayed. Reference Fluid Set
Selection, page 9.
Clean or replace fluid nozzle
Tighten cover or replace gasket
(siphon cup only)
Check for leaks in FlexLiner System.
See "FlexLiner System" section,
page 27.
Clean cup fitting, material strainer
and siphon tube (if applicable)
Check for obstructions in gun tubing.
Clean or replace gun tubing if
necessary.
Siphon cup: Remove cup (leave
cover connected). Trigger gun and
check air flow out of check valve. If air
is not flowing freely, clean or replace
check valve.
Clean check valve. Reference
Cleaning Quick Clean Check Valve
(Siphon Cup only), page 22.
Replace material strainer if plugged
or remove if material is highly
viscous.
Clean gun body with solvent and
brush provided. Adjust needle
packing.
bent nozzle or needle; tighten nozzle
or replace parts as needed.
Loosen packing nut slowly until
needle returns freely.
Soak air cap and/or fluid nozzle in
solvent. Clean air cap horn holes with
non-metallic item to avoid
permanently damaging them.
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