TROUBLESHOOTING DEFECTIVE SPRAY PATTERNS
The following procedure summarizes the steps that an
operator must immediately take when the first signs of a
defective spray pattern emerge.
1. Check the external portion of the fluid tip for material
buildup. If buildup has occurred, secure the gun trigger
safety switch and clean the gun fluid tip with a non-metal
soft brush.
2. If the spray pattern exhibits signs of tails at the top or
bottom ends of the pattern, increase the air pressure
gradually until the tails disappear.
3. If increasing air pressure does not dissipate the tails, the
fluid tip may be worn and may need to be replaced.
Another sign of the need to replace a worn tip is a gradual
decline in spraying pattern width.
4. If cleaning or replacing the fluid tip does not dissipate the
tails; the spraying defect is most likely due to the material
temperature and/or viscosity.
5. If pattern pulsation or blinking occurs, check the pressure
regulators, all downstream regulators, and the pump. These
may require further adjustment or even repairs.
Figure 3
Correct
Pattern
Tails
GENERAL TROUBLESHOOTING
IMPORTANT REGULATORY NOTE
The AA1600M Air-Assist H.V.L.P. hand spray gun combines the proven efficiency of the Binks compliant spray guns with air-assist
atomization to yield a reliable, carefully engineered compliant spray gun. With 25' of 5/16" I.D. air hose and regulator set at only 20
p.s.i. the compliant air cap registers 10 p.s.i. of atomization air to shape and soften the spray pattern. The AA1600M air-assist H.V.L.P.
gun operates at high transfer efficiencies and fully complies with all government regulations for H.V.L.P. spray guns.
Max. Fluid Input: 1600 psi / 110 BAR
Max. static air pressure at regulator with 25' of hose to inlet: 20 psi / 1.4 BAR
Max. Dynamic Gun Inlet Air Pressure: 14 psi / 1 BAR
Gun Body: Forged Aluminum Alloy
Fluid Path: Stainless Steel and Tungsten Carbide / UHMW
PROBLEM
CAUSE
ACTION
Fluid leaking from
through the seal
Worn seal or needle shaft.
Loose needle seal.
Replace needle assembly (18).
Tighten packing nut gently until leak stops.
Fluid leaking from the
front of the gun
Needle ball worn or damaged.
Worn seat assembly.
Replace needle assembly (18).
Replace fluid seat (3/3A).
Fluid in air passages
Spray tip seal leaking.
Leaking around fluid seat.
Tighten air cap/nozzle guard assembly (7)
Replace carbide tip assembly (5/5A).
Tighten or replace fluid seat (3/3A).
Slow fluid shut off
Fluid buildup on needle assembly.
Clean or replace needle assembly (18).
No fluid output when
triggered
Tip orifice plugged.
Needle is damaged or broken.
Fluid filter or fluid hose plugged.
For flat tip: Turn off fluid supply. Relieve pressure into a closed earth-grounded
container. Engage trigger safety. Remove air cap/nozzle guard assembly (6) and
the carbide tip (5). Clean or replace carbide tip assembly (5).
For twist tip: Rotate twist tip (5A) in aircap (6A) and spray into a closed-
grounded container to try clear tip of any debris. If that fails to unplug the tip
then remove, clean and replace twist tip.
Turn off fluid supply. Relieve pressure into a closed-grounded container. Remove
trigger (10). Replace needle assembly (18)
Turn off fluid supply. Relieve pressure into a closed-grounded container. Turn off
air supply to pump and relieve fluid pressure with bypass valve. Engage trigger
safety. Very slowly loosen the hose connection at the gun to relieve any pressure
in hose. Remove hose and clear obstruction. NOTE: When replacing filter, use
two wrenches—one to hold tube (11) in place and prevent twisting, and the
other to remove nut (14). Only tighten nut (14) from 9 to 11 ft.-lbs.
(Refer to page 12 when referencing part numbers in brackets.)
!
CAUTION
Always engage trigger lock and relieve fluid pressure before servic-
ing gun.
EN
77-2921-R12 (2/2021)
5 / 14
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