Maintenance; Daily Care And Cleaning; Flush The Spray Gun - Graco PRO AA4000 Instructions Manual

Daily Care and Cleaning

CAUTION
Clean all parts with a non–conductive solvent,
compatible with the fluid being sprayed. Conduc-
tive solvents can cause the gun to malfunction.
Methylene chloride is not recommended as a
flushing or cleaning solvent with this gun as it will
damage nylon components.
Do not use any cleaning method which may
allow solvent into the gun air passages.
Immersing the gun in solvent is not recommended
as a cleaning method. Solvent left in gun passages
could result in a poor quality paint finish and may
draw current and reduce the electrostatic effect.
Solvent in the power supply cavity can reduce al-
ternator life.
WARNING
For your safety, always follow the Pressure Re-
lief Procedure on page 4 when shutting off the sys-
tem, when you stop spraying, and before checking,
servicing, installing, cleaning or changing any part
in the system.
1. Clean the fluid and air line filters daily.
2. Check all of the work hangers for build-up of
material; clean them, if necessary.
3. Clean the gun fluid filter (26) daily. See Fig 6.
a. Unscrew and remove the fluid inlet fitting (25).
b. Remove the filter (26) and clean thoroughly in a
compatible non-conductive solvent.
c. Reinstall the filter and inlet fitting. DO NOT over
tighten the inlet fitting as over tightening could
distort the filter.
4. Clean the outside of the gun daily with a soft cloth
dampened in a compatible solvent.
5. Clean the air cap and spray tip daily, minimum.
Some applications require more frequent cleaning.
Replace spray tip and air cap if they are damaged.
a. Remove the air cap and spray tip.
b. Clean the tip and air cap with solvent and scrub
with a soft brush.
WARNING
To avoid damaging the ball seat housing resistor,
use a soft bristle brush dipped in solvent to clean;
DO NOT soak it in solvent! A damaged resistor will
impair the electrical continuity and could result in
electrical discharge, which could cause serious
injury, fire, or explosion.

MAINTENANCE

c. Use a soft brush or other soft tool, with an air
blow gun, to clean air cap passages. Take care
not to scratch any surfaces. If air cap holes are
plugged, use a round toothpick to unplug the
holes.
Do not use metal tools to clean the air cap holes as
this may scratch them, and make sure the elec-
trode wire is not damaged. Scratches in the air cap
holes or a damaged electrode wire can distort the
spray pattern.
6. Check the electrode wire. Straighten if bent, and
replace if broken or damaged. See Electrode Wire
Replacement.
KEY
25 Fluid Inlet Fitting
26 Fluid Filter
Fig 6

Flush the Spray Gun

To reduce the risk of electric shock, which could
result in serious injury, or the risk of fire or explo-
sion the ES On-Off lever (electrostatics) must be
OFF before flushing.
For your safety, always follow the Pressure
Relief Procedure on page 4 before flushing.
Methylene chloride is not recommended as a
flushing or cleaning solvent with this gun as it will
damage nylon components.
1. Follow the Pressure Relief Procedure on page 4.
2. Disconnect and plug the fluid line.
3. Connect the solvent supply to the gun.
4. Flush the gun with solvent until it is clean.
5. Follow the Pressure Relief Procedure, then dis-
connect the solvent supply.
6. Reconnect the fluid supply line.
8. Trigger the gun until it is clear of solvent.
CAUTION
26
25
WARNING
CAUTION