Graco HVLP EDGE Gun 256855 Repair Manual page 10

Problem
No or slow fluid flow, intermit-
tent spray, or fluttering spray
Fluid leaks at fluid nozzle
after trigger is released
Poor spray pattern
Fluid leaks at packing nut
Needle does not return after
trigger is released or is slow
to return
10
Cause
Wrong size fluid set being used
Gun fluid nozzle blocked by dried
paint or damaged
Cup or pressure pot cover not tight
enough or gasket damaged
Cup or pressure pot fluid tubes
blocked by dried paint or damaged
Air flow to cup blocked
Needle packings not properly
adjusted.
Note: Fluid loss through packings
affects fluid pressure and causes a
fluid leak from gun body.
Plugged inlet strainer
Needle not seating in fluid nozzle
Air cap horn hole and/or fluid nozzle
plugged
Packing nut is loose
Packing nut is too tight
Solution
Select proper fluid set for fluid being sprayed,
page 6
Clean or replace fluid nozzle
Tighten cover or replace gasket
Clean or replace fluid tubes
To check, 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 gun body with solvent and brush pro-
vided. Adjust needle packings.
Replace strainer if plugged or remove strainer if
material is high viscous.
Check for a loose fluid nozzle or a bent nozzle
or needle; tighten nozzle or replace parts as
needed.
Soak air cap and/or fluid nozzle in solvent.
Clean air cap horn holes with non-metallic item
to avoid permanently damaging them.
Tighten packing nut slightly and re-test. Repeat
until packings seal completely, see page 7.
Loosen packing nut slowly until needle returns
freely, see page 7.
Troubleshooting
313317K