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 |
| 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.
for
update parts breakdown information, please check
here.
COPYRIGHTS
IS RESERVED
|
in gun washer.
,
tighten by hand, or a wrench can be used but do
not use excessive force.