Spray Gun Problems - Graco 980S Instructions-Parts List Manual

Spray Gun Problems

PROBLEM
No or slow fluid flow, inter-
mittent spray, or fluttering
spray
Fluid leaks at fluid nozzle
after the trigger is released
Poor spray pattern
Troubleshooting
CAUSE
Proper size fluid set is not being used.
Air cap is adjusted too far forward.
Gun fluid nozzle is not tight enough, is
blocked by dried paint, or is damaged.
Cup or pressure pot cover is not tight
enough or gasket is damaged.
Cup or pressure pot fluid tube blocked
by dried paint or is damaged.
Air flow to cup is blocked.
Needle packings are not properly ad-
justed. Fluid loss though the packings
will effect fluid pressure and cause a
fluid build-up in the gun body.
Needle is not properly adjusted. Fluid
flow will be restricted if there is too
much free travel between the trigger
and needle.
Needle is not seating in the fluid
nozzle.
Air cap horn holes and/or fluid nozzle
plugged.
SOLUTION
Select the proper fluid set for the fluid
being sprayed. See page 10.
Adjust the air cap to "normal" position.
See page 9.
Tighten, clean or replace fluid nozzle.
Tighten cover or replace gasket.
Clean or replace fluid tube.
To check: remove the cup (leave
cover connected), trigger the gun and
check for air flow out of the cup lower
pressure tube. If air is not flowing
freely, clean the air passage tubes.
Clean the gun body with solvent and
the brush provided. Adjust the needle
packings as instructed on page 17.
Adjust the needle as instructed on
page 16.
Check for a loose fluid nozzle or a
bent nozzle or needle; tighten the
nozzle or replace parts as needed.
Check the needle adjustment; see
page 16.
Check the needle packings adjust-
ment; see page 17.
Soak air cap and/or fluid nozzle in sol-
vent. Clean air cap horn holes with
non-metallic item to avoid permanently
damaging them. See page 14.