Gun will not spray
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No air pressure to gun - Check compressed air supply. Open built-in cheater valve.
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Fluid control turned in too far - Turn fluid control counterclockwise to increase flow.
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(Siphon cup) fluid too viscous to siphon - Thin fluid or change to gravity or pressure feed system.
No fluid flow with trigger pulled
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Brass stop on needle may have loosened allowing needle to close with trigger pulled - Replace needle (part of nozzle kit)
Spray pattern too dry
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Low fluid flow - Increase fluid flow by backing out fluid control knob or (with pressure cup/tank) increase fluid pressure setting
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Air pressure too low with siphon gun - Increase atomizing air pressure to increase siphoning action
Unacceptable spray pattern
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Atomizing air pressure too low - Increase inlet air pressure (43PSI gun inlet pressure required for 10 PSI nozzle pressure on Warwick HVLP guns)
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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.
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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
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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)
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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
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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’)
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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
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Material too viscous for use with gravity cup - Convert to gun with pressure cup
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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
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Fluid level too low - Add fluid to cup
Intermittent spray (Fluttering spray pattern usually results from air being mixed with fluid)
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Loose fluid nozzle - Make sure fluid nozzle is sufficiently tight
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Air being drawn into fluid through siphon cup attachment - Be sure siphon cup is fastened tightly onto gun
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Low fluid level in cup - Add fluid
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Fluid packing dried out or packing nut needs tightening - Lubricate packing and/or tighten packing nut (do not over tighten and restrict needle movement)
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Siphon cup vent hole plugged - Clean vent hole
Spray pattern heavy at top or bottom
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Side port (horn) holes plugged - Clean – ream with non-metallic point (toothpick or similar tool) or replace nozzle kit
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Material buildup on outside of fluid tip, Nozzle damaged - Clean or replace nozzle kit. Replace nozzle kit
Spray pattern heavy at right or left side
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Side port hole plugged on left or right side - Clean – ream with toothpick
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Material buildup on outside of fluid tip - Clean
Spray pattern split
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Atomizing air pressure too high - Reduce atomizing pressure
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Low fluid pressure (with pressure cup or tank) - Increase fluid pressure setting
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Fluid control knob (at back of gun) turned in too far - Turn counter-clockwise to increase fluid flow
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Fan control open too far - Turn clockwise to decrease
Spray pattern heavy at right or left side
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Fluid pressure too high relative to atomizing air pressure (pressure feed only) - Adjust air and fluid pressures and/or widen fan pattern width
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Excessive fluid flow for air nozzle being used - Decrease fluid flow or change air nozzle to higher capacity
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Atomizing air pressure too low - Increase atomizing air pressure
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Viscosity of fluid too high - Thin to sprayable viscosity
Excessive overspray
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Atomizing pressure too high - Reduce pressure
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Improper spray technique – arcing gun, spraying off surface being coated - Keep gun perpendicular to work surface, release trigger at end of spray stroke
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Excessive distance from gun to work surface - Spray at proper distance (Usually 8” to 12” from surface)
Dry finish on product
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Excessive atomizing pressure - Reduce pressure
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Excessive distance from gun to work surface - Spray at proper distance (Usually 6” to 10” from surface)
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Coating reduced incorrectly (with siphon cup) - Thin coating to proper viscosity
Leaking fluid packing
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Packing nut loose - Tighten
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Dry or worn out packing - Lubricate or replace packing
Fluid drips or flows freely from tip of gun (pressure feed only)
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Needle/nozzle worn or damaged - Replace
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Needle spring missing - Replace spring behind fluid control knob
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Packing nut over tightened - Loosen packing nut
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Fluid nozzle tip plugged with obstruction - Clear obstruction from tip
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Incorrect fluid nozzle/needle combination - Make sure fluid nozzle and needle match
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Fluid control spring missing from back of needle - Replace
Orange peel finish (poorly atomized bumpy surface)
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Insufficient atomizing pressure - Increase pressure
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Coating not properly thinned - Thin to manufacturer’s specifications
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Incorrect thinner used - Thin to manufacturer’s specifications
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Insufficient gun to surface distance - Increase distance (Usually 6” to 10”)
Finish sags and runs
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Coating too thin - Thin to manufacturer’s specifications
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Excessive fluid flow - Adjust fluid control knob or reduce fluid pressure (if using pressure cup/tank)
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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
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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
DO NOT:
1.
Do not use hand to tighten or loose your cup!
When installing gravity cups tighten/loose only by wrench. Cups are damaged by this can not be refunded or exchanged.
2.
Do not clean cup lid in gun washer.
Wipe lid clean with solvent on cloth. Cup lid was placed in gun washer for cleaning which can shrink lid and it may cuase the lid does not seal and fluid may leak.
3.
Do not turning counter clockwise of the baffle or it will damage the internal threads of the gun and the gun will no longer be usable.
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.
4.
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.
5. If you are experiencing leaking problem with 878SHE gun, please make sure you have the following gasket either on your gun or inside your cup thread.
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 34H) 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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