Gun Operation Troubleshooting - Graco 244592 Instructions-Parts List Manual

Gun Operation Troubleshooting

Problem
Excessive spray fog.
"Orange Peel" finish.
Fluid leaks from the fluid packing
area
Air leaks from the air cap
Fluid leakage from the front of the
gun
Gun does not spray
Paint buildup on air cap
Air leaks from manifold
Fluid doesn't shut off properly.
309298J
Cause
Atomization air pressure too high.
Fluid too thin.
Atomization air pressure too low.
Spray tip (4) too large.
Poorly mixed or filtered fluid.
Fluid too thick.
Worn fluid needle packings or shaft.
Worn piston stem o-rings (34e, 34f).
Worn or damaged fluid needle (8).
Worn fluid seat housing (5).
Loose spray tip (4).
Damaged tip seal (4a).
Low fluid supply.
Dirty or clogged spray tip (4).
Damaged spray tip (4).
Damaged fluid needle (8).
Piston (34) not actuating.
Actuator arm (29) is out of position.
Atomization air pressure too high.
Dirty air cap.
Manifold is not tight.
Worn or missing o-rings.
Seat housing (5) too tight.
Fluid buildup on fluid needle (8).
Piston sticking.
Troubleshooting
Solution
Decrease air pressure as low as pos-
sible.
Increase viscosity.
Increase air pressure; use lowest
pressure necessary.
Use smaller tip; see page 51.
Remix or refilter fluid.
Reduce viscosity.
Replace fluid needle assembly (8);
see page 41.
Replace; see page 42.
Replace; see page 41
Replace; see page 37.
Tighten retaining ring (1); see page
37.
Replace; see page 37.
Add fluid if necessary.
Clean; see page 37.
Replace; see page 37.
Replace; see page 41.
Check cylinder air. Check piston
u-cup (34d); see page 48.
Check actuator arm and nuts. See
page 43.
Reduce.
Clean; see page 37.
Tighten manifold screws (106).
Replace o-rings. See page 43.
Replace; see page 37.
Replace needle; see page 41.
Clean or replace o-rings. See page
43.
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