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5.6
Correction of Spray Pattern Imperfections
The following table shows how to correct a defective spray pattern.
Spray pattern test
Fault
Swollen centre
Swollen ends
Coarse pearl effect
Unduly thin paint
layer in centre
Split centre
Split centre
6
Cleaning and Maintenance
6.1
Safety Instructions
• Prior to any service work atomising air as well as material feed to the spray gun
should be shut off - risk of injury.
• Open fires, naked lights and smoking are prohibited in the working area. There is an
increased risk of fire and explosion, when spraying readily flammable media, such as
cleaning solutions.
• Follow the safety instructions issued by the manufacturers of the cleaning media.
Aggressive and caustic cleaning agents in particular represent health hazards.
6.2
General Cleaning Procedure
The spray gun should be frequently cleaned and lubricated to ensure reliable operati-
on and long life.
Caution
Never immerse the spray gun in solvents or other cleaning fluids as this will impair the
functional reliability and efficiency of the gun.
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Desired Spray Pattern
Necessary adjustment
• Spray jet should be flatter
• Spray jet should be rounder
• Increase atomising air pressure
• Decrease atomising air pressure
• Increase nozzle diameter
• Reduce atomising air pressure
• Increase material pressure
• Decrease material pressure
• Increase atomising air pressure
Caution
Do not use any hard or sharp-pointed objects when cleaning the spray gun, as the
pre- cision-made parts can easily be damaged and are likely to affect your spraying
results.
Only use cleaning solutions recommended by the manufacturer of the spraying
material. These solutions should not contain any of the following constituents:
• halogenated hydrocarbons (e.g. 1,1,1-trichloroethane, methylene chloride etc.)
• acids and acidic cleaning solutions
• regenerated solvents (so-called cleaning dilutions)
• paint removers.
These constituents cause chemical reactions with electroplated components resul-
ting in corrosion damage.
WALTHER Spritz-und Lackiersysteme GmbH is not liable for any damages resul-
ting from improper treatment of the gun.
The spray gun should be cleaned
• at least once a week
• as often as necessary in a week depending on the spraying medium used and
the resulting level of soiling.
1. Dismantle the gun as described in section 5.5 Re-tooling the Spray Gun.
2. Clean the air control head and nozzle with a brush dipped in the recommended
cleaning solution.
3. Clean the gun body and all remaining parts with a soft cloth and the recommen-
ded cleaning solution.
4. Apply a thin layer of grease to the following parts:
• Material needle
• Needle Spring
• All sliding parts and bearings.
• The moveable inner parts should be greased at least once a week.
• The springs should at all times be coated with a thin layer of grease.
Use non-acidic, non-resinogenic grease and a brush. The spray gun is then reas-
sembled in reverse order.
6.3
Routine Cleaning
It is not always necessary to dismantle the spray gun for cleaning purposes when
the material is changed or at the end of a work period.
For routine cleaning purposes please observe the following steps:
1. Fill the cleaned gravity feed cup/syphon feed cup/pressure feed cup or the cleaned
material pressure tank with a cleaning medium compatible with the material pro-
cessed.
2. Start the spray gun (see 5.2 Requirements at the Start and Finish of Operation).
3. Do not stop the gun until only clear cleaning solution emerges from the nozzle.
The complete spraying system should stay depressurised until the gun is used again.
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