Resource Library
Spray Pattern Chart I-2301
- Spray Pattern Chart I-2301 [ English ]
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Correction
Correction
Correction
Cause
Cause
Cause
• Will not spray • No air pressure at gun
• Fluid needle adjusting screw not
open enough
• Fluid too heavy for suction feed
• Check air supply and air lines
• Change to proper suction feed
air cap
• Increase fluid pressure at tank
• Open fluid needle adjusting screw
• Thin material or change to
pressure feed
• Gun spits paint when
triggering on and off
• Incorrect needle fitted to gun
• Excessive needle wear
• Excessive fluid tip wear
• Check tip/needle selection
chart and fit correct item
• Replace with new needle
• Replace with new fluid tip
• Small air leak from air cap
when gun is not triggered
• Air valve contaminated and not
correctly sealing
• Remove valve and thoroughly
clean valves shaft and seating
• Gun spits paint when
triggering on due to paint
build-up inside air cap
between spraying
operations
• Fluid tip not fitted correctly in
gun head
• Fluid tip/needle leakage
• Tighten to correct torque
• Check for damage or blockage
• Slow fluid leak from fluid
tip and needle seat
• Fluid tip internal seat scored,
damaged or worn
• Fluid needle external profile
damaged or worn
• Contamination on needle or
tip mating surfaces preventing
good seal
• Incorrect fluid tip for fluid
needle fitted to gun
• Sluggish needle
• Tight packing
• Replace
• Replace
• Thoroughly clean
• Check tip/needle selection
chart and fit correct item
• Remove needle, clean or
lubricate packing
• Adjust
• Major fluid leak or fluid
jetting from fluid tip
• Remove tip and needle, thoroughly
clean surfaces preventing good seal
• Check tip/needle selection chart
and fit correct term
• Remove and clean fluid needle shaft
• Lubricate and loosen needle packing
• Paint build-up on fluid tip • Fluid tip not fitted correctly
in gun head
• Fluid tip/needle packing
worn or loose
• Tighten to correct torque
• Check for damage or blockage
• Slow fluid leak from
needle packing
• Fluid needle packing worn
or loose
• Tighten or replace as necessary
• Air leak from baffle seal • Baffle seal swollen or damaged • Replace
• Stiff trigger action • Air valve stem bent
• Contamination on air valve stem
• Contamination on trigger
bearing screw
• Contamination on fluid needle shaft
• Fluid needle packing too tight
• Replace damaged component
• Remove and clean
• Remove and clean
• Remove and clean
• Loosen packing nut
• Air valve sluggish or slow
to turn on/off when
trigger is pulled/released
• Air valve stem bent
• Contamination on air valve stem
• Remove damaged component
• Remove and clean
• Unable to turn fan control
knob on top rear of gun
• Unable to get
round spray
• Internal o-ring swollen or broken
• Paint contamination on thread
• Fluid tip or air baffle
incorrectly fitted
• Air baffle chimney damaged
• Replace o-rings
• Remove and thoroughly clean
• Remove, check components
for damage and refit correctly
• Replace air baffle
• Unable to turn air control
valve on handle of gun
• Seal damaged or missing • Replace
• Air cap retaining ring
will not rotate
• Contamination on
retaining threads
• Deformed or damaged
retaining ring
• Soak gun head in solvent
to soften paint
• Cut retaining ring off of gun
(probably replace retaining
ring and baffle as well)
Cause Correction
• Internal o-ring swollen or broken
• Paint contamination on threads
• Replace o-ring
• Remove and thoroughly clean
Static Spray Pattern Test
The static spray pattern test is undertaken to ensure the
consistency and the size of the spray pattern.
Procedure: make a horizontal spray pattern by holding the
trigger until sagging occurs (see examples below for analysis).
Good
Bad
How Does Your Spray Gun Shape Up?
No matter how experienced the sprayer, merely triggering and moving a gun in space will not reveal any of the
performance characteristics vital to a top quality finish. A simple brief static spray pattern will immediately highlight
any potential problems before the gun is used on the painstakingly prepared workpiece or vehicle.
1. Ensure that you have the correct air cap, fluid tip and needle set-up on the gun to match the material being applied.
2. Tape up a piece of brown paper - approx 20 (1/2 m) square - onto the spray booth wall at shoulder height.
3. Having set the gun at the recommended inlet or atomizing air pressure, hold it at the correct target distance and spray
at the paper without moving the gun.
Follow the procedure explained below and compare the pattern to our examples.
The information below provides you with a simple and
effective method of tracing problems with your gun if it
proves to be troublesome. Look down the left hand condition
column until you identify the problem and you will find the
possible cause and correction that needs to be taken.
The Three C’s Of Spray
Gun Troubleshooting
Condition, Cause, Correction
• Clean nozzle and air cap
• Rotate the cap one-half turn
• If the defect is not inverted,
renew nozzle
• If it is inverted, renew air cap
Troubleshooting Possible Reasons
Solutions
Nozzle or cap dirty or defective
• Reduce fluid pressure or nozzle diameter
• Change the fluid viscosity
Troubleshooting Possible Reasons
Solutions
Fluid flow too low or viscosity too low
• Change nozzle size
• Reduce fluid flow (needle/regulator)
• Select air cap with higher fluid flow capacity
Troubleshooting Possible Reasons
Solutions
Fluid flow too high
Gravity spray gun: Reduce air pressure
or increase the nozzle diameter
Pressure spray gun: Vary the air pressure.
Increase fluid pressure or nozzle diameter.
Clean the cap or change it if the defect persists.
Troubleshooting Possible Reasons
Solutions
Fluid flow too low
Pressure too high
Cap center partially blocked
• Dilute the fluid
• Reduce the fluid pressure or the nozzle diameter
• Clean the cap or change it if the defect persists
Troubleshooting Possible Reasons
Solutions
• Material too thick, flow too high
• Air cap horn holes partially blocked
• Cap center defective
Defect Free Spray Patterns
Good spray pattern dimensions
Symmetrical
Uniform (see static spray pattern test)
• Clean nozzle and air cap
• Check all air cap holes and nozzle
exterior for partial blockage or damage
Troubleshooting Possible Reasons
Solutions
Nozzle or cap dirty or defective
If your result resembles any of the following, then look at the corrective measures before you apply paint to the workpiece.
• Air valve seal damaged or missing • Replace
• Air valve will not operate
when trigger is pulled
• Air valve stem bent
• Contamination on air valve stem
• Remove air valve and replace
damaged air valve stem
• Remove air valve and
thoroughly clean
• Air leak from around
air valve stem
Get The Best
From Your Gun
The best spray patterns for optimum quality
• Contamination on needle or
tip mating tip and needle seat
• Incorrect fluid tip for fluid
needle fitted to gun
• Fluid needle stuck or
binding up
Cause Correction
Cause Correction
Cause Correction
Cause Correction
Cause Correction
Cause Correction
• Air leak from fluid needle
exit point in top of handle
•
•
For more information,
visit binks.com.
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