Installation, Operation, Preventive Maintenance & Cleaning - DeVilbiss GFG PRO Technical Bulletin

Gravity spray gun
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INSTALLATION
For maximum transfer efficiency, do not use more
pressure than is necessary to atomise the material
being applied.
1.
Connect the gun to a clean, moisture and oil free
air supply using a conductive hose, of at least 8
mm I.D.
Depending on hose length, larger I.D. hose may be
required. Install an air gauge at the gun handle.
When gun is triggered on, adjust regulated air
pressure to the required setting (see chart 1 p13).
Do not use more pressure than is necessary to
atomise the material being applied. Excess
pressure will create additional overspray and
reduce transfer efficiency.
If an air adjusting valve is used at the gun inlet, use
DGIPRO-502-BAR Digital Gauge. Some competitive
adjusting valves have significant pressure drop that
can adversely affect spray performance. The
DGIPRO Digital Gauge has minimal pressure drop.
2.
Attach the gravity feed cup to the material inlet.
Before using the gun, flush it with solvent to ensure
that the fluid passages are clean.
OPERATION
1.
Mix coating material to manufacturer's instructions
and strain material.
2.
Fill the cup to no more than 20 mm from the top of
the cup. DO NOT OVERFILL.
3.
Attach Cup Lid.
4.
Turn fluid adjusting knob (18) clockwise to prevent
fluid needle movement.
5.
Turn spreader valve adjusting knob (23) counter
clockwise to fully open.
6.
Adjust inlet air pressure (see chart 1 p13).
7.
Turn fluid adjusting knob counter clockwise until
first thread shows.
8.
Test spray. If the finish is too dry, reduce airflow by
reducing air inlet pressure.
9.
If finish is too wet, reduce fluid flow by turning fluid
adjusting knob (18) clockwise. If atomisation is too
coarse, increase inlet air pressure. If too fine,
reduce inlet pressure.
10. The pattern size can be reduced by turning
spreader valve knob (23) clockwise.
11. Hold gun perpendicular to surface being sprayed.
Arcing or tilting may result in uneven coating.
12. The recommended spray distance is 150-200 mm.
13. Spray edges first. Overlap each stroke a minimum
of 75%. Move gun at a constant speed.
14. Always turn off air supply and relieve pressure
when gun is not in use.
PREVENTIVE MAINTENANCE &
CLEANING
To clean air cap and fluid nozzle, brush exterior with a
stiff bristle brush. If necessary to clean cap holes, use a
NOTE
NOTE
NOTE
broom straw or toothpick if possible. If a wire or hard
instrument is used, extreme care must be used to
prevent scratching or burring of the holes which will
cause a distorted spray pattern.
To clean fluid passages, remove excess material from
cup, then flush with gun wash solution. Wipe the gun
exterior with a dampened cloth. Never completely
immerse in any solvent as this is detrimental to the
lubricants and life of the spray gun.
When replacing the fluid nozzle or fluid needle, replace
both at the same time. Using worn parts can cause fluid
leakage. See page 13, Chart 2. Also, replace the needle
packing at this time. Torque the fluid nozzle to 18–20
nm. Do not over tighten.
CAUTION
To prevent damage to fluid nozzle (8) or fluid needle
(15), be sure to either 1) pull the trigger and hold while
tightening or loosening the fluid nozzle, or 2) remove
fluid adjusting knob (18) to relieve spring pressure
against needle collar.
CAUTION
IMPORTANT– the Gravity cup is made from special anti-
static materials, but it still important to avoid generating
static charges. The Cup must not be cleaned or rubbed
with a dry cloth or paper. It is possible to generate a
static charge by rubbing which, if discharged to an
earthed object could create an incendive spark and
cause solvent vapours to ignite. Only use a dampened
cloth or antistatic wipes if manual cleaning is required
within a hazardous area.
8
NOTE
© 2012 Finishing Brands UK Ltd.

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