Problem |
Possible
Cause |
Solution |
| Gun
will not spray |
No
air pressure to gun |
Check
compressed air supplyOpen built-in cheater valve |
| |
Fluid
control turned in too far |
Turn
fluid control counterclockwise to increase flow |
| |
(Siphon
cup) fluid too viscous to siphon |
Thin
fluid or change to gravity or pressure feed system |
| No
fluid flow with trigger pulled |
Brass
stop on needle may have loosened allowing needle to close with
trigger pulled |
Replace
needle (part of nozzle kit) |
| Spray
pattern too dry |
Low
fluid flow |
Increase
fluid flow by backing out fluid control knob or (with pressure
cup/tank) increase fluid pressure setting |
| |
Air
pressure too low with siphon gun |
Increase
atomizing air pressure to increase siphoning action |
| Unacceptable
spray pattern |
Atomizing
air pressure too low |
Increase
inlet air pressure (43PSI gun inlet pressure required for 10
PSI nozzle pressure on Warwick HVLP guns) |
| |
Inadequate
cleaning resulting in dried paint around the fluid tip or in
the air nozzle |
Soak
fluid nozzle and air nozzle in gun cleaning solvent or acetone
and clean with brush. (Do not use metal tools of any kind to
clean orifices – this can distort the orifices and cause
a faulty spray pattern. When necessary use a toothpick)Never
soak complete gun in solvent. Either brush clean with solvent
or place in completely enclosed gun washer. |
| |
Insufficient
fluid available (Most likely to occur with siphon cup if material
is too viscous) |
Use
a pressure cup or tank in place of siphon cup or use a gravity
feed gun |
| |
Inlet
strainer on bottom of fluid tube is plugged or is too fine a
mesh for fluid being sprayed |
Clean
or eliminate inlet strainer (clean coatings usually do not need
this additional straining anyway) |
| |
Fluid
nozzle too small for application |
Replace
nozzle kit (fluid nozzle, needle and air cap) with kit that
includes larger fluid nozzle |
| Insufficient
fluid delivery from a pressure cup or pressure tank |
Pressure
setting at cup or tank is too low for viscosity of fluid being
sprayed or diameter and length of hose being used |
Increase
fluid pressure setting at cup/tank or replace fluid hose with
larger diameter (3/8” inside diameter usually recommended
for common fluids and lengths up to 50’) |
| |
Inlet
strainer on bottom of fluid tube is plugged or is too fine a
mesh for fluid being sprayed |
Clean
or eliminate inlet strainer (clean coatings usually do not need
additional straining) |
| Insufficient
fluid delivery from a gravity cup |
Material
too viscous for use with gravity cup |
Convert
to gun with pressure cup |
| |
Fluid
nozzle too small for coating viscosity and flow rate required |
Replace
fluid nozzle with larger size |
| Insufficient
fluid delivery from a siphon or pressure cup |
Fluid
level too low |
Add
fluid to cup |
| Intermittent
spray (Fluttering spray pattern usually results from air being
mixed with fluid) |
Loose
fluid nozzle |
Make
sure fluid nozzle is sufficiently tight |
| |
Air
being drawn into fluid through siphon cup attachment |
Be
sure siphon cup is fastened tightly onto gun |
| |
Low
fluid level in cup |
Add
fluid |
| |
Fluid
packing dried out or packing nut needs tightening |
Lubricate
packing and/or tighten packing nut (do not over tighten and
restrict needle movement) |
| |
Siphon
cup vent hole plugged |
Clean
vent hole |
| Spray
pattern heavy at top or bottom |
Side
port (horn) holes plugged |
Clean
– ream with non-metallic point (toothpick or similar tool)
or replace nozzle kit |
| |
Material
buildup on outside of fluid tipNozzle damaged |
Clean
or replace nozzle kitReplace nozzle kit |
| Spray
pattern heavy at right or left side |
Side
port hole plugged on left or right side |
Clean
– ream with toothpick |
| |
Material
buildup on outside of fluid tip |
Clean |
| Spray
pattern split |
Atomizing
air pressure too high |
Reduce
atomizing pressure |
| |
Low
fluid pressure (with pressure cup or tank) |
Increase
fluid pressure setting |
| |
Fluid
control knob (at back of gun) turned in too far |
Turn
counter-clockwise to increase fluid flow |
| |
Fan
control open too far |
Turn
clockwise to decrease |
| Spray
pattern heavy at center |
Fluid
pressure too high relative to atomizing air pressure (pressure
feed only) |
Adjust
air and fluid pressures and/or widen fan pattern width |
| |
Excessive
fluid flow for air nozzle being used |
Decrease
fluid flow or change air nozzle to higher capacity |
| Spray
pattern heavy at center (Continued) |
Atomizing
air pressure too low |
Increase
atomizing air pressure |
| |
Viscosity
of fluid too high |
Thin
to sprayable viscosity |
| Excessive
overspray |
Atomizing
pressure too high |
Reduce
pressure |
| |
Improper
spray technique – arcing gun, spraying off surface being
coated |
Keep
gun perpendicular to work surface, release trigger at end of
spray stroke |
| |
Excessive
distance from gun to work surface |
Spray
at proper distance (Usually 8” to 12” from surface) |
| Dry
finish on product |
Excessive
atomizing pressure |
Reduce
pressure |
| |
Excessive
distance from gun to work surface |
Spray
at proper distance (Usually 6” to 10” from surface) |
| |
Coating
reduced incorrectly (with siphon cup) |
Thin
coating to proper viscosity |
| Leaking
fluid packing |
Packing
nut loose |
Tighten |
| |
Dry
or worn out packing |
Lubricate
or replace packing |
| Fluid
drips or flows freely from tip of gun (pressure feed only) |
Needle/nozzle
worn or damaged |
Replace
|
| |
Needle
spring missing |
Replace
spring behind fluid control knob |
| |
Packing
nut over tightened |
Loosen
packing nut |
| |
Fluid
nozzle tip plugged with obstruction |
Clear
obstruction from tip |
| |
Incorrect
fluid nozzle/needle combination |
Make
sure fluid nozzle and needle match |
| |
Fluid
control spring missing from back of needle |
Replace |
| Orange
peel finish (poorly atomized bumpy surface) |
Insufficient
atomizing pressure |
Increase
pressure |
| |
Coating
not properly thinned |
Thin
to manufacturer’s specifications |
| |
Incorrect
thinner used |
Thin
to manufacturer’s specifications |
| |
Insufficient
gun to surface distance |
Increase
distance (Usually 6” to 10”) |
| Finish
sags and runs |
Coating
too thin |
Thin
to manufacturer’s specifications |
| |
Excessive
fluid flow |
Adjust
fluid control knob or reduce fluid pressure (if using pressure
cup/tank) |
| Finish
sags and runs (continued) |
Fluid
nozzle too large for coating being applied |
Replace
nozzle kit with correct size (consult Warwick fluid nozzle selection
chart) or turn in fluid control knob at back of gun |
| Gravity
cup lid does not seal – fluid leaks from cup |
Cup
lid was placed in gun washer for cleaning which can shrink lid |
Wipe
lid clean with solvent on cloth – do not clean in gun
washer |
Additional
Operating Tips for Warwick Spray Guns
1. To control inlet air pressure between 43
and 60 PSI
- It is recommended that the Warwick gun mounted regulator
(Reg 34) be used for the most precise control of inlet air
pressure
- If gun is equipped with built-in “cheater” valve
(#33) be sure it is completely open
2. If leaking occurs at packing nut (#13a)
- Loosen nut, then pull and release trigger 10 times to insure
needle moves freely
- Hand tighten packing nut
- If this procedure does not stop the leak, replace needle
packing
3. Continuous air leak from front of gun
- Replace air valve assembly (#13a)
4. When installing gravity cups tighten/loose
only by wrench.
5. When installing a siphon cup, tighten by
hand, or a wrench can be used but do not use excessive force.
It is advisable to hold the fluid inlet on the gun with a
second wrench during this procedure to prevent internal damage
to the gun.
6. When cleaning the gun check the condition
of the fluid nozzle and the surface of the baffle behind the
fluid nozzle. Holes in the baffle must be kept clean. If baffle
surface is damaged it must be replaced. Caution: The baffle
must be removed using the wrench provided and turning clockwise.
Turning counter clockwise will damage the internal threads
of the gun and the gun will no longer be usable.
When replacing the baffle be sure to install
the gasket (#10) behind it correctly so the air holes are
not blocked.
If the fan pattern of the gun cannot be adjusted
after the baffle has been replaced check to make sure there
is no obstruction in the air passage. (Example: Teflon tape
that might have been used on the air inlet fitting might have
worked its way into the gun.)
7. Note that the fluid control includes a
locking nut to maintain adjustment during use of the gun.
Loosen this nut (turning counter-clockwise) before making
adjustments.
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|
