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REA-90 and 90L Spray Guns - Maintenance
N O T E
N O T E
N O T E
N O T E
N O T E
The following procedure is to set the
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sequence of operation for air and fluid as
the trigger is actuated. It is very important
that atomizing air be introduced before the
fluid. If fluid is energized prior to the air,
the applicator will spit large paint particles
onto the part being coated.
1. Actuate the trigger slowly, watching the
sequence of mechanical operation. The trigger
set screw should engage the air valve before the
strike plate of the trigger contacts the front
adjustment nut on the needle shaft assembly.
2. If the sequence of operation is out of order,
ensure that the distance between the back surface
of the barrel packing chamber to the back of the
hexagon of the needle shaft spring retainer is
11/16-inch (refer to Figure 13).
3. Normally if this distance is correct, the
mechanical sequence will function properly. If not,
check the assembly for problems such as a
missing gasket, loose fluid nozzle, loose needle
electrode, or damage to any of these components.
4. To readjust the 11/16-inch distance, the trigger
and ground spring must be removed. Then the
hexagon nuts may be loosened using (2) 3/8-inch
open-end wrenches.
5. To delay fluid actuation, increase the 11/16-
inch distance or to quicken the actuation of fluid
decrease this distance. Be sure not to over adjust
in either direction. A distance to great will not allow
full needle travel or a distance to short may not
allow adequate spring force on the needle valve.
6. After establishing the proper mechanical
sequence of air then fluid actuation, reinstall the
ground spring and trigger.
7. Another adjustment is turning the trigger set
screw clockwise, reducing the distance required
to engage the air valve and counter-clockwise to
increase the distance. Be sure not to over adjust
in either direction.
5 5
5 5
5 5
5 5
5 5
F F F F F AN AIR ADJUSTMENT
AN AIR ADJUSTMENT
AN AIR ADJUSTMENT
AN AIR ADJUSTMENT
AN AIR ADJUSTMENT
The fan air screw adjustments should be made
during normal spray operating conditions. The
adjustment of the screw is dependent on the
material being sprayed, the desired spray pattern,
and the spray technology type. Turning the fan air
screw clockwise will close the pattern and turning
it counter-clockwise will open it up. For additional
information on adjusting the spray pattern, refer to
"REA Applicator Spray Techniques" manual.
FLUID DELIVERY
FLUID DELIVERY
FLUID DELIVERY
FLUID DELIVERY
FLUID DELIVERY
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
Fluid delivery to the spray applicator should be
made external to it. Some fluid adjustments can be
done on the applicator by adjusting the trigger stop
screw. When the stop is adjusted fully back
(clockwise), the spray applicator should be at
maximum fluid delivery. By turning the trigger stop
forward (counter-clockwise), the fluid delivery can
be reduced.
A A A A A T T T T T OMIZING AIR
OMIZING AIR
OMIZING AIR
OMIZING AIR
OMIZING AIR
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
The atomizing air supplied to the spray applicator
can only be adjusted external to the applicator.
There is no means of adjusting the atomizing air
pressure at the spray applicator.
AH-94-04.7
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