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

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. (A DVFR filter /regulator is
recommended).
Install an air gauge at the gun handle. When gun
is triggered on, adjust regulated pressure to 2.5
to 3.0 bar. 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 or HAV-
501-B. Some competitive adjusting valves have
significant pressure drop that can adversely
affect spray performance.
2. SUCTION MODELS ONLY. Attach the cup lid
assembly (62) to the fluid inlet connector (54).
Position the yoke at right angles to the gun with
the cam lever to the front (see picture). Make
sure the vent hole in drip free diaphragm (60) is
180° to the lid vent hole.
3. PRESSURE FEED MODELS. Connect the fluid
supply hose to Fluid inlet Connector (54).
Before using the spraygun, flush it with solvent
to ensure that the fluid passages are clean.
OPERATION (
SUCTION MODELS
Mix coating material to manufacturer's
1.
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 to Cup Lid.
ALL MODELS
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 to 2.5 to 3.0 bar.
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.
NOTE
NOTE
NOTE
)
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 broom straw or toothpick if possible. If a wire or
hard instrument is used, extreme care must be used
to prevent damaging the holes which will cause a
distorted spray pattern.
To clean fluid passages, remove excess material
from cup, or disconnect hose for pressure models,
then flush with gun wash solution. Wipe the gun
exterior with a dampened cloth. Never completely
immerse in any solvent or cleaning solutions 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 14, Chart 2. Also,
replace the needle packing at this time. Torque the
fluid nozzle to 18–20 nm. Do not over tighten.
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.
SUCTION CUP. Empty excess material and clean
the cup. Make sure the vent holes in the Diaphragm
(60) and the lid (62) are clear.
8
NOTE
CAUTION
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