WALTHER PILOT PILOT Signier 20 357, Руководство по эксплуатации

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6 Troubleshooting 5 Retooling the spray gun
Before retooling the spray gun, always ensure that the air supply and material supply to
the spray gun have been interrupted.
The combination of air cap, material nozzle and needle for a certain spraying material
forms a specially matched unit - the nozzle assembly. Always exchange the complete
nozzle assembly in order to maintain the desired spray pattern quality.
5.1 Changing the air cap
1. Unscrew the air cap nut and remove the air cap.
2. Installation takes place in reverse order.
5.2 Changing the material nozzle
1. Unscrew the air cap nut.
2. Remove the air cap.
3. Unscrew the material nozzle from the spray gun head.
4. Installation takes place in reverse order.
5.3 Changing the material needle
1. Unscrew the spray gun head from the body.
2. Release the front part and unscrew the clamping sleeve.
3. Remove the support washer and the diaphragm.
4. Withdraw the material needle together with the pressure spring.
5. Installation takes place in reverse order.
5.4 Changing the diaphragm
1. Unscrew the spray gun head from the body.
2. Release the front part and unscrew the clamping sleeve.
3. Remove the support washer and the diaphragm.
4. Installation takes place in reverse order.
5. When reinstalling the diaphragm, ensure that the teflon-coated side is pointing towards
the material channel.
Fault Cause Remedy
Gun drips
Gun does not open
Irregular or splattering spray
Gun sprays when switched off
Material leaks from the leaka-
ge hole
Material bubbling in material
container
Spray fan one-sided
Material needle or nozzle
dirty
Material needle or nozzle
damaged
Control air pressure too
low
Insufficient material in con-
tainer
rubber packing ring Item
24 damaged
Diaphragm damaged
Atomising air is entering
the material container via
the material channel.
Material nozzle or air cap
not properly tightened
Air cap horn bore dirty
Remove and clean
Replace
Increase control air pressure
to min. 4.5 bar
Fill up with material (see
instructions from material
manufacturer)
Replace
Replace
Clean the parts, tighten or
replace
Remove and clean
5 6
Spray pattern test Fault Necessary adjustment
Swollen centre • Spray jet should be flatter
Swollen ends • Spray jet should be rounder
Coarse pearl effect • Increase atomising air pressure
Unduly thin paint
layer in centre
• Decrease atomising air pressure
Split centre
• Increase nozzle diameter
• Reduce atomising air pressure
• Increase material pressure
Split centre
• Decrease material pressure
• Increase atomising air pressure