DÖRR EcoGun AA AUTO User manual

EcoGun AA AUTO
Automatic Spray Gun Air Assist
MSG00008EN, V04
N36230001V
www.durr.com
Operation manual

Information about the document
This document describes the correct han-
dling of the product.
Read the document prior to every activity.
Prepare the document for the application.
Pass on the product only together with
the complete documentation.
Always follow safety instructions, han-
dling instructions and specifications of
every kind.
Illustrations can deviate from the tech-
nical construction.
Validity range of the document
This document describes the following
product:
N36230001V
EcoGun AA AUTO
Hotline and Contact
If you have queries or would like technical
information, please contact your dealer or
sales partner.
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TABLE OF CONTENTS
1 Product overview.......................... 4
1.1 Overview................................ 4
1.2 Short description.................... 4
2 Safety............................................. 5
2.1 Presentation of Notes............ 5
2.2 Intended Use.......................... 5
2.3 Staff qualification.................... 6
2.4 Personal protective equip-
ment....................................... 6
2.5 Residual risks......................... 6
3 Transport, scope of supply and
storage........................................... 7
3.1 Scope of delivery................... 7
3.2 Handling of
packaging material................. 8
3.3 Storage.................................. 8
4 Assembly....................................... 8
4.1 Requirements for the
Installation point..................... 8
4.2 Assembly............................... 8
4.3 Setting the spray jet............. 11
5 Commissioning........................... 11
6 Operation..................................... 13
6.1 Safety recommendations..... 13
6.2 General notes...................... 13
6.3 Selecting air cap.................. 13
6.4 Rinsing................................. 14
6.4.1 Safety recommendations.. 14
6.4.2 Rinsing.............................. 14
7 Cleaning....................................... 14
7.1 Safety recommendations .... 14
7.2 Cleaning............................... 16
8 Maintenance................................ 17
8.1 Safety notes......................... 17
8.2 Maintenance schedule......... 18
8.3 Lubrication........................... 18
9 Faults........................................... 18
9.1 Safety recommendations .... 18
9.2 Defects table........................ 20
9.3 Troubleshooting................... 22
9.3.1 Replace nozzle................. 22
9.3.2 Replace needle and
seals.................................. 23
9.3.3 Replace needle spring
and plunger spring............ 24
9.3.4 Set delay time................... 25
9.3.5 Replace piston seals......... 26
10 Disassembly and Disposal........ 27
10.1 Safety recommendations... 27
10.2 Disassembly....................... 27
10.3 Disposal ............................ 28
11 Technical data............................. 28
11.1 Dimensions and weight...... 28
11.2 Connections....................... 28
11.3 Operating conditions.......... 28
11.4 Emissions........................... 28
11.5 Operating values................ 29
11.6 Type plate........................... 29
11.7 Materials used.................... 29
11.8 Operating and auxiliary
materials............................. 29
11.9 Material specification.......... 29
12 Replacement parts, tools and
accessories................................. 30
12.1 Replacement parts............. 30
12.2 Tools................................... 43
12.3 Accessories........................ 43
12.4 Order.................................. 45
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1 Product overview
1.1 Overview
Fig. 1: Product overview
1 Connecting piece
2 Atomizer air control (R)
3 Horn air control (F)
4 End cap
5 Control air connection (C)
6 Spraying air connection (A)
7 Cap nut with seal
8 Air cap
9 Material connection (M)
10 Fastening bore
11 Housing
12 Leakage bore
1.2 Short description
The spray gun is intended for surface
coating in high pressure area. Compressed
air is used to apply material. The atomized
coating material is fed through high pressure
lines. The operation can be done with paint
circulation or tap line.
Use a nozzle with a suitable diameter,
depending on the requirement.
The following factors influence the spray jet
and therefore the result
Alignment of the air cap
The alignment of the air cap determines
the alignment of the spray jet.
Atomizer air pressure
The higher the atomizer air pressure, the
finer is the atomization and the smaller is
the spray pattern.
Horn air pressure
The higher the horn air pressure, the
softer the spray jet pattern edges
become.
Control air pressure
Opens the needle and controls the mate-
rial outflow.
Material pressure
The higher the material pressure, the
higher the material flow and thus the finer
the atomization. The lower the material
pressure, the higher is the efficiency and
the smaller is the overspray generated.
Nozzle
Product overview
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The higher the bore diameter, the more
the material flowing out. The greater the
angle, the broader is the spray pattern.
Control air pressure is controlled externally
via valves.
The spraying air pressure (A) is controlled
externally via valves. The horn air pressure
and atomizer air pressure can be adjusted
on the spray gun by means of the horn air
pressure (F) and the atomizer air control (R).
The material pressure is controlled externally
via valves.
2 Safety
2.1 Presentation of Notes
The following notes can appear in this
instruction:
DANGER!
High risk situation that can lead to serious
injuries or death.
WARNING!
Medium risk situation that can lead to
serious injuries or death.
CAUTION!
Low risk situations that can lead to minor
injuries.
NOTICE!
Situations that can lead to material
damage.
ENVIRONMENT!
Situations that can lead to environmental
damage.
Additional information and recom-
mendations.
2.2 Intended Use
Use
The EcoGun AA AUTO spray gun is only
intended for use in industry and craftman-
ship.
The EcoGun AA AUTO spray gun is solely
intended for automatic coating of surfaces by
one of the following operating methods:
As independent, not hand guided device
As part of a fully automated paint booth
As part of a paint robot
The material is fed through a high pressure
line.
The use is only permitted within the specified
technical data Ä 11 “Technical data”.
The spray gun is approved for use in explo-
sive areas of Ex zones 1.
Misuse
If used incorrectly, it can cause serious inju-
ries or death.
Examples of wrong use are:
Aiming the spray gun at humans or ani-
mals.
Atomization of fluid nitrogen
Use of unapproved materials
Use of hose lines that are unsuited to the
material and operating pressure used.
Combination of the spray gun with com-
ponents that are not approved by Dürr
Systems for operation.
Unauthorized modifications
Use in explosive areas Ex zone 0
EX labeling
II 2G T6 X
Safety
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II - Device group II: all areas except
mining
2G - Device category 2 for gas
T6 - Temperature class T6: Surface tem-
perature, max. 85°C
X - Specific conditions for safe operation
The following conditions must be observed
for safe operation:
The spray gun and the work piece must
be grounded.
Only use conductive lines.
Ensure that static electricity can be dis-
charged.
2.3 Staff qualification
WARNING!
Inadequate qualification
Wrong estimation of dangers can cause
serious injury or death.
– Only sufficiently qualified persons may
execute all work.
– Some work requires additional qualifi-
cation. Additional qualifications of spe-
cialized personnel are marked with a
“+”.
This document is intended for qualified per-
sonnel in industry and craftmanship.
Operator
The operator is trained specifically for the
field of work in which he works.
Furthermore, the operator possesses the fol-
lowing knowledge:
Technical Measures for occupational
safety and health
The operator is responsible for the following
work:
Operate and monitor the system/ product.
Introduce measures in the event of faults.
Clean system/ product.
+ additional qualification explosion pro-
tection
In addition to the knowledge of the various
specialist fields, the mechanic has knowl-
edge of regulations and safety measures
when working in potentially explosive areas.
Dürr Systems offers special product training
for Ä “Hotline and Contact”.
2.4 Personal protective equipment
Wear the required personal protective equip-
ment when working. Provide the following
personal protective equipment:
2.5 Residual risks
Explosion
Sparks, open flames and hot surfaces can
cause explosions in explosive atmospheres.
Serious injury and death could be the conse-
quence.
Before carrying out any work, make sure
that there is no explosive atmosphere.
Do not use sources of ignition and open
light.
Do not smoke.
Ground the spray gun.
Ground the work piece.
Only use conductive lines.
Safety
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Flammable coating materials and their deter-
gents and cleaning agents can cause a fire
or an explosion.
Ensure that the flashpoint of the fluid is at
least 15 K above the ambient tempera-
ture.
Note explosion group of the fluid.
Follow the safety data sheet.
Ensure that forced ventilation and fire
protection equipment are in operation.
Do not use sources of ignition and open
light.
Do not smoke.
Ground the spray gun.
Danger from harmful or irritant sub-
stances
Serious injuries or death can result if you
come into contact with dangerous fluids or
steam.
Spray gun Check regularly for leakage.
Observe local regulations and mainte-
nance schedule.
Ensure that the forced ventilation is
operational.
Follow the safety data sheet.
Wear specified protective equipment.
Escaping material
Material leaking under high pressure can
penetrate the body. Even if the injury looks
like a harmless cut wound, the penetrating
material leads to amputation, serious injuries
can cause death.
Do not try to seal leakages using body
parts, gloves or towels.
If there are injuries, seek medical atten-
tion immediately.
Before working on the product:
Purge the system, in which the product is
installed.
Disconnect the system, in which the
product is installed, from compressed air
and material supply.
Depressurize the lines.
Secure the system against being
switched on again.
Movable components
There is a risk of death if components or
equipment in the vicinity move unexpectedly.
Switch off and lock out all system compo-
nents against being switched on again
before working on the product.
Noise
The sound pressure level during operation
may cause severe hearing damage.
Wear ear protection.
Do not spend more time then necessary
in the work area.
Hot surfaces
During normal operation the surfaces of
components can get extremely hot. Contact
with it can cause burns.
Before carrying out any work:
Check the temperature.
Do not touch hot surfaces.
Let components cool down.
Wear protective gloves.
3 Transport, scope of supply
and storage
3.1 Scope of delivery
The scope of supply includes the following
components:
Spray gun
Tool kit Ä 12.1 “Replacement parts”
Inspect delivery on receipt for completeness
and integrity.
Report defects immediately Ä “Hotline and
Contact”.
Transport, scope of supply and storage
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3.2 Handling of packaging material
ENVIRONMENT!
Incorrect disposal
Incorrectly disposed packaging material
can damage environment.
– Dispose of material no longer required
in an environment-friendly manner.
– Observe local disposal specifications.
3.3 Storage
Storage provisions:
Do not store outdoors.
Store Spray gun only when dry.
Store in a dust-free place.
Do not expose to aggressive media.
Protect from solar radiation.
Avoid mechanical vibrations.
Temperature: 10°C to 40°C
Relative humidity: 35% to 90%
4 Assembly
4.1 Requirements for the
Installation point.
The control air supply and the material
feed to the spray gun must be interrupted
and secured against reconnection.
Lines, seals and screw connections must
be designed to conform to the require-
ments of the spray gun Ä 11.5 “Operating
values”.
A support bracket capable of securing the
spray gun is required.
The control air supply must be adjustable.
The control air supply must have venting.
The material must be fed through a filter
to avoid clogging of the nozzle.
4.2 Assembly
Stationary assembly
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Protective workwear
Protective gloves
Observe the following at assembly:
Diameter of the fastening bore: 10mm
Nominal diameters: Ä 11.2 “Connections”
1. WARNING!
Sources of ignition may cause explo-
sions!
Ensure a non-explosive atmosphere.
Assembly
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Fig. 2: Assembly
2. Push spray gun with the fastening bore
(1) on the support bracket.
Alignment is not important. Dis-
tance to the work piece: 15 to
25cm
3. WARNING!
Statically charges components may
cause explosions during operation!
Ground the spray gun through the fas-
tening bore or material connection lines, if
the support bracket itself is non-conduc-
tive or is not grounded. Ensure housing
contact.
Resistance between housing and
grounding terminal ≤ 1MΩ.
Fig. 3: Connect
4. The spray gun does not work
when the lines are not connected
correctly.
Connect lines. Ensure correct assign-
ment.
1- Material (M)
2 - Spraying air (A)
3 - Control air (C)
Connect lines to both material
connections for paint circulation
mode.
For tap line mode, connect line to
a material connection. Leave the
other material connection closed
by means of the sealing screw.
Assembly
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Robot assembly
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Protective workwear
Protective gloves
For a robot assembly, the corresponding
robot version of the spray gun must be used
or the spray gun must be reconstructed with
the components of the optional robot kit
Ä 12.3 “Accessories” for robot version. The
regular inserts are exchanged here against
connecting pieces.
The reconstruction and the connection of the
robot version of the spray gun are described
below.
1. WARNING!
Sources of ignition may cause explo-
sions!
WARNING!
Statically charges components may
cause explosions during operation!
Attach spray gun on the support bracket
as for the stationary assembly and
ground it properly Ä “Stationary
assembly”.
Fig. 4: Assembling robot accessories
2. Lock spraying air connection (A) with the
blind plugs of the robot kits (4).
3. Replace regulating inserts of the atomizer
air control (R) and the horn air control (F)
by the regulating inserts and the screw-in
plug connections of the robot kits (1 and
2).
4. The spray gun does not work
when the lines are not connected
correctly.
Connect lines. Ensure correct assign-
ment.
1- Atomizer air (R)
2 - Horn air (F)
3 - Material (M)
4 - Unused
5 - Control air (C)
Connect lines to both material con-
nections for paint circulation mode.
For tap line mode, connect line to a
material connection. Leave the other
material connection closed by
means of the sealing screw.
Assembly
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4.3 Setting the spray jet
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Protective workwear
Protective gloves
Fig. 5: Adjust spray jet
The orientation of the spray jet can be
changed to any direction by rotating the air
cap (2).
1. Lightly loosen the cap nut (1).
Fig. 6: Align air cap
2. Rotate air cap (2) into the required posi-
tion.
3. Hand-tighten cap nut (1).
5 Commissioning
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Use ear protection
Eye protection
Respiratory protection device
Protective workwear
Protective gloves
Depending on the design of the application
system, two technicians must be present to
execute the commissioning:
Technician 1: Operates the controls.
Technician 2: Check on the spray gun.
1. Actuate the spray gun without material
via the control unit or the visualizer.
2. Check the switching behavior.
Does the needle open and close as
required?
Are all types of air supply connected?
3. Purge spray gun Ä 6.4 “Rinsing”.
4. Connect material.
5. Create a trial spray pattern on a test work
piece.
Commissioning
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Setting the spray pattern
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Use ear protection
Eye protection
Respiratory protection device
Protective workwear
Protective gloves
You can set the spray pattern by using the
horn air and atomizer air.
You can vary the size of the spray
pattern by adjusting the distance of
the spray gun to the work piece and
the selected nozzle size.
Fig. 7: Setting the spray pattern
1. Close atomizer air control (1) and horn air
control (2) or atomizer air supply (R) and
horn air supply (F) completely.
If horn air and atomizer air are
blocked, atomization is done
exclusively through material pres-
sure (airless mode).
2. Adjust material quantity by means of the
nozzle size. Adjust material pressure air
through valves in the control cabinet.
Observe the following character-
istic curve.
Fig. 8: Rectify the offshoot
3. Open horn air control (2) or horn air
supply (F), until the spray pattern no
longer has any offshoots (stripes).
Fig. 9: Shorten spray pattern
4. The length of the spray pattern can be
adjusted by opening the atomizer air con-
trol (1) or atomizer air supply (R).
Recommendation: Replace
nozzle with a nozzle with a
smaller spray jet angle.
Commissioning
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Characteristic curve
Fig. 10: Characteristic curve
X-Achse Nozzle diameter [mm]
Y-Achse Flow rate [Nl/min (CFM)]
The characteristic curve shows the relation
between nozzle diameter and the flow rate at
100bar material pressure with water.
6 Operation
6.1 Safety recommendations
WARNING!
Danger of explosion due to chemical
reactions
Material, halogenated hydrocarbon-based
rinsing agent or cleaning agent can chemi-
cally react with aluminum components of
the product. Chemical reactions can cause
explosions. Serious injury and death could
be the consequence.
– Only use purging agents and cleaning
agents that do not contain any halo-
genated hydrocarbons.
NOTICE!
Material damage due to dried material
residues
If material residues dry in the product, that
can harm components.
– Rinse product immediately after each
use.
6.2 General notes
1. Perform the following checks during oper-
ation:
Check O-rings for correct seating and
tightness.
Check air car for cleanliness.
Check nozzle for cleanliness.
6.3 Selecting air cap
You can convert the spray gun for various
uses by swapping the air cap.
Air cap for hexagonal nozzle
The air cap for hexagonal nozzles is the
most frequently used air cap type. The air
cap is used for different water-based paints,
solvent-based paints and colors.
The air cap for hexagonal nozzles has two
different versions:
For a spray jet angle from 10 to 30°
For spray jet angle from 40 to 130°
A label on the air cap identifies the type of
version.
Air cap for circular nozzles
The air cap for round nozzles is used for
clear coats and quick drying coating mate-
rials. It has slit air ducts for the horn air.
Operation
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6.4 Rinsing
6.4.1 Safety recommendations
NOTICE!
Material damage due to unsuitable
rinsing agent
If the rinsing agent reacts chemically with
the components or the material, compo-
nents get damaged.
– Use only the rinsing agents that are
compatible with the components and
the material.
– Refer to safety data sheet of material
manufacturer.
6.4.2 Rinsing
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Use ear protection
Eye protection
Respiratory protection device
Protective workwear
Protective gloves
The spray gun must be rinsed:
After end of work
Before every change of material
Prior to cleaning
Prior to dismantling
Before a long time of non-use
Before placing in storage
Additional rinsing intervals depend
on the material used.
1. Rinse the spray gun with an appropriate
rinsing agent until the rinsing agent runs
clean without any material residue.
7 Cleaning
7.1 Safety recommendations
WARNING!
Danger of fire and explosion
Flammable coating materials and their
detergents and cleaning agents can cause
a fire or an explosion.
– Ensure that the flashpoint of the fluid is
at least 15 K above the ambient tem-
perature.
– Note explosion group of the fluid.
–Follow the safety data sheet.
–Ensure that forced ventilation and fire
protection equipment are in operation.
– Do not use sources of ignition and
open light.
– Do not smoke.
– Check grounding.
WARNING!
Danger from harmful or irritant sub-
stances
Serious injuries or death can result if you
come into contact with dangerous fluids or
steam.
– Spray gun Check regularly for leakage.
Observe local regulations and mainte-
nance schedule.
– Ensure that the forced ventilation is
operational.
– Follow the safety data sheet.
– Wear specified protective clothing.
– Avoid contact (e.g. with eyes, skin).
Cleaning
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WARNING!
Material escaping under pressure
Material leaking under high pressure can
penetrate the body. Even if the injury looks
like a harmless cut wound, the penetrating
material leads to amputation, serious inju-
ries can cause death.
– Do not try to seal leakages using body
parts, gloves or towels.
– If there are injuries, seek medical
attention immediately.
Before working on the product:
– Disconnect the system, in which the
product is installed, from compressed
air and material supply.
– Secure the system against being
switched on again.
–Depressurize the lines.
WARNING!
Danger of explosion due to chemical
reactions
Material, halogenated hydrocarbon-based
rinsing agent or cleaning agent can chemi-
cally react with aluminum components of
the product. Chemical reactions can cause
explosions. Serious injury and death could
be the consequence.
– Only use purging agents and cleaning
agents that do not contain any halo-
genated hydrocarbons.
NOTICE!
Unsuitable cleaning agents
Unsuitable cleaning agents can damage
the product.
– Only use cleaning agents approved by
the material manufacturer.
– Follow safety data sheets.
– Place heavily soiled components in a
cleaning bath.
– Only place those parts in the
cleaning bath, which are suitable for
the cleaning bath.
– Use only electrically conductive
containers.
– Ground the container.
– Do not use ultrasound baths.
Use alcohols (isopropanol, butanol) for
non-flammable coating materials.
Remove dried non-flammable coating
materials using a material manufacturer-
approved organic thinner.
NOTICE!
Damage due to unsuitable cleaning
tools
Unsuitable cleaning tools can damage the
product.
– Only use cloths, soft brushes and
paintbrushes.
– Do not use abrasive cleaning tools.
– Do not poke blocked nozzles with met-
allic objects.
– Do not use compressed air for
cleaning.
– Do not use any thinner spray guns.
– Do not use high pressure for cleaning
agents.
Cleaning
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7.2 Cleaning
Clean spray gun
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Use ear protection
Eye protection
Respiratory protection device
Protective workwear
Protective gloves
1. Purge spray gun Ä 6.4 “Rinsing”.
2. Use a cleaning agent to carefully clean
the spray gun. Dry with a soft cloth.
Cleaning the air cap und nozzle
Fig. 11: Clean spray gun
For a thorough cleaning you can remove the
air cap and the nozzle.
Disassembly
1. Loosen the cap nut (3) and remove it.
2. Remove air cap (1) and nozzle.
3. Push out nozzle (2) from the back of the
air cap and catch it.
4. Clean air cap using cleaning agent and
cleaning brush Ä 12.2 “Tools”.
5. Wipe the cleaned air cap dry with a cloth.
6. Clean the nozzle in the cleaning bath.
Assembly
Fig. 12: Insert nozzle
7. Insert nozzle (2) from the back to fit into
the air cap (1). Pay attention to the cor-
rect alignment of the nozzle groove (4).
8. Fit air cap (1) and nozzle.
9. Align air cap.
10. Fit cap nut (3). Tighten by hand.
Cleaning
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8 Maintenance
8.1 Safety notes
WARNING!
Unsuitable replacement parts in explo-
sive areas
Replacement parts not compliant with the
specifications of the ATEX guidelines can
cause explosions in an explosive atmos-
phere. Serious injury and death could be
the consequence.
– Use exclusively original replacement
parts.
WARNING!
Danger from harmful or irritant sub-
stances
Serious injuries or death can result if you
come into contact with dangerous fluids or
steam.
– Spray gun Check regularly for leakage.
Observe local regulations and mainte-
nance schedule.
– Ensure that the forced ventilation is
operational.
– Follow the safety data sheet.
– Wear specified protective clothing.
– Avoid contact (e.g. with eyes, skin).
WARNING!
Material escaping under pressure
Material leaking under high pressure can
penetrate the body. Even if the injury looks
like a harmless cut wound, the penetrating
material leads to amputation, serious inju-
ries can cause death.
– Do not try to seal leakages using body
parts, gloves or towels.
– If there are injuries, seek medical
attention immediately.
Before working on the product:
– Disconnect the system, in which the
product is installed, from compressed
air and material supply.
– Secure the system against being
switched on again.
–Depressurize the lines.
CAUTION!
Risk of injury due to spring tension
The end cap of the spray gun is under
spring tension. If you remove the end cap,
the spring tension could cause the end
cap to jump out unexpectedly and cause
light injuries.
– Removing and installing end cap
Maintenance
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8.2 Maintenance schedule
The maintenance intervals given below are based on experiential values. Maintenance intervals,
adjust individually if necessary.
Interval Maintenance work
Daily Check condition and tightness (also of the connections
and lines).
Check fastening.
Before every change of material Clean Ä 7.2 “Cleaning”.
Monthly Lubricate internal components Ä 8.3 “Lubrication”.
After each alteration Check grounding Ä 4.2 “Assembly”.
8.3 Lubrication
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Protective workwear
Protective gloves
Piston axis, needle shank, piston sleeve and
piston glide surface in the gun housing must
be lubricated so that there will not be any
leakages.
Fig. 13: Lubricate piston components
1. Feed lubricant (silicone-free oil) at the
control air connection (C) (1) using con-
trol air.
9 Faults
9.1 Safety recommendations
CAUTION!
Risk of injury due to spring tension
The end cap of the spray gun is under
spring tension. If you remove the end cap,
the spring tension could cause the end
cap to jump out unexpectedly and cause
light injuries.
– Removing and installing end cap
Faults
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NOTICE!
Material damage due to improper
replacement of needle and seal retainer
screw.
Replacing only the needle or only the seal
retainer screw could damage spray gun
components. This can compromise the
tightness of the spray gun. The spray pat-
tern deteriorates.
– Observe order of disassembly steps
(needle – seal retainer screw).
– Observe order of assembly steps (Seal
retainer screw – needle).
– Always replace seal retainer screw and
needle at the same time.
NOTICE!
Property damage due to improper han-
dling
Mechanical load can damage needle and
nozzle.
– Handle with care during installation
and dismantling.
– Do not subject the needle to any
mechanical pressure.
– Avoid collisions of components to be
assembled and disassembled with the
needle.
– Do not excessively tighten compo-
nents.
NOTICE!
Improper setting causes damage
The delay time is factory-set. Setting a
wrong delay time can damage the nozzle
and the needle.
– You should only change the delay time
upon inserting a new needle or in case
there are problems with the spray pat-
tern.
– If in doubt, contact Dürr Systems
Ä “Hotline and Contact”.
Faults
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9.2 Defects table
Visualizer of typical spray pattern problems
Spray pattern Fault identification
Spray jet is distorted.
Spray jet distinctly smaller than original (about
25%).
Spray jet is uneven.
Fault description Cause Remedy
No material Feed line pinched or
broken.
Check the line.
Needle does not open. Check Control air.
Material escapes with
the needle closed.
Needle does not close
correctly.
Check control air venting.
Check operation of needle. Replace
needle, if defective, together with
the seal retainer screw Ä 9.3.2
“Replace needle and seals.”.
Needle spring and
plunger spring are worn
out.
Replace needle spring and plunger
spring Ä 9.3.3 “Replace needle spring
and plunger spring.”.
Seal retainer screw, seal
washer or needle is worn
out.
Replace seal retainer screw, seal
washer and needle Ä 9.3.2 “Replace
needle and seals.”.
Material escapes at the
needle seal.
Needle seal is worn out. Replace needle seal Ä 9.3.2 “Replace
needle and seals.”.
Needle gland is loose. Tighten needle gland sensitively.
Air escapes at the end
cap.
Piston sleeve is worn out. Replace piston sleeve Ä 9.3.5
“Replace piston seals.”.
Faults
02/2020EcoGun AA AUTO - MSG00008EN20/48