DeVilbiss Cobra 2 User manual

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SB-E-2-CBA2 ISS.09
Operation Manual
Cobra 2 – Automatic Spray Gun
EN

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Operation Manual
Cobra 2 Automatic Spraygun
Important
Read and follow all instructions and Safety Precautions before using this
equipment
CHARACTERISTICS
This automatic spray gun complies to ATEX regulations 94/9/EC, protection level II 2 G X, suitable to
use in Zones 1 & 2.
This Cobra 2 is a production spray gun suitable for use with automatic and semi-automatic machines
in conventional, HVLP or Trans-Tech applications.
Cobra 2 has a ¼ turn Quick detachable device, so to reduce maintenance & set up time (SMED).
To handle a wide range of coating materials the fluid passages are manufactured from high grade
stainless steel.
This spray gun is supplied with an indexed air cap. You can leave your air cap capable of free
rotation by removing the indexed plastic ring which is located by 2 pins on the air cap.
Pressure feed material supply can be re-circulating or direct.
The needle adjustment knob has 18 ratchet positions, allows fine and accurate fluid flow control.
SPECIFICATIONS & MATERIALS OF CONSTRUCTION
Thread Pressure
Fluid inlet & recirculation “P” 1/8 BSP Max 7 Bar
Air inlet (Atom+Fan) “A” “F” 1/8 BSP Max 7 Bar
Cylinder/trigger “C” 1/8 BSP 4 to 7 bar
Maximum temperature in use 40° C
Spray gun weight 950 g
Gun body Aluminium hard anodized
Tip / Needle / Spray head/ Base plate Stainless steel 303
EC Declaration of Conformity
We, ITW Finishing UK, Ringwood Rd, Bournemouth, Dorset, BH11 9LH, UK, as the
manufacturer of the Spray gun model COBRA , declare, under our sole responsibility that the
equipment to which this document relates is in conformity with the following standards or other
normative documents:
BS EN 292-1 PARTS 1 & 2: 1991, BS EN 1953: 1999; and thereby conform to the protection
requirements of Council Directive 98/37/EEC relating to Machinery Safety Directive, and;
EN 13463-1:2001, council Directive 94/9/EC relating to Equipment and Protective Systems
intended for use in Potentially Explosive Atmospheres protection level II 2 G X.
B. Holt, General Manager 24th April 2007
ITW Finishing Systems and Products reserve the right to modify equipment specification without prior notice.

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SAFETY WARNINGS
Fire and explosion
Solvents and coating materials can be highly flammable or combustible when sprayed.
ALWAYS refer to the coating material supplier’s instructions and COSHH sheets
before using this equipment.
Users must comply with all local and national codes of practice and insurance company
requirements governing ventilation, fire precautions, operation and house-keeping of
working areas.
This equipment, as supplied, is NOT suitable for use with Halogenated
Hydrocarbons.
Static electricity can be generated by fluid and/or air passing through hoses, by the
spraying process and by cleaning non- conductive parts with cloths. To prevent ignition
sources from static discharges, earth continuity must be maintained to the spray gun and
other metallic equipment used. It is essential to use conductive air and/or fluid hoses.
Personal Protective Equipment
Toxic vapours – When sprayed, certain materials may be poisonous, create irritation or
are otherwise harmful to health. Always read all labels, safety data sheets and follow any
recommendations for the material before spraying. If in doubt, contact your material
supplier.
The use of respiratory protective equipment is recommended at all times. The type of
equipment must be compatible with the material being sprayed.
Always wear eye protection when spraying or cleaning the spray gun.
Gloves must be worn when spraying or cleaning the equipment.
Training – Personnel should be given adequate training in the safe use of spraying equipment.
Misuse
Never aim a spray gun at any part of the body.
Never exceed the max. Recommended safe working pressure for the equipment.
The fitting of non-recommended or non-original spares may create hazards.
Before cleaning or maintenance, all pressure must be isolated and relieved from the equipment.
The product should be cleaned using a gun-washing machine. However, this equipment should
not be left inside gun-washing machines for prolonged periods of time.
Noise Levels
The A-weighted sound level of spray guns may exceed 85 dB (A) depending on the set-
up being used. Details of actual noise levels are available on request. It is recommended
that ear protection is worn at all times when spraying.
Operating
Spray equipment using high pressures may be subject to recoil forces. Under certain
circumstances, such forces could result in repetitive strain injury to the operator.

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LIST OF SPARE PARTS
Rep Ref Description Qty
1 SP-100-xxx-K
See chart and reference above.
Air cap with retaining ring, seals. 1
2
SP-247S-xx-K
SP-200S-xx-K
SP-259S-xx-K
Fluid tip with air separator seal
Ø 2,2 / 2,8 for Air cap 470
Ø 0,6 / 0,85 / 1,0 / 1,2 / 1,4 / 1,6 /1,8 / 2,2 / 2,8
Ø 0,5 / 0,7 / 1,0 for Air cap 590 & 591
1
4 SPA-112 Index ring (Air cap) 1
5 SPA-27-K5 Separator Kit of 5 1
6 S-14192-K4 Screw M4 x 25 Kit of 4 (Torx 20) 4
8 SPA-50 Spray head 1
SPA-50U Spray head - recirculation 1
8a SPA-51 Quick Release Pin 1
9 SPA-86-K
SPA-86-K10 Packing Kit of 1
Packing Kit of 10 2
10 SPA-29X-K4 O ring Kit of 4 4
11 SPA-53-K10 Gasket Kit of 10 2
12 SPA-1-CBA2 Gun body 1
12a SPA-52 Location Pin 1
12b S-28223X-K4 O ring Kit of 4 1
13 AGG-403 Air valve (Fan & Atomising) 2
14 S-28220X-K2 O Ring Kit of 2 1
15 SPA-60X-K Piston Assembly & seals (16,15b,15c & 15d) 1
15b SPA-62-K2 Small Piston. 2
15c S-28224X-K4 O ring Kit of 4 2
15d S-28225X-K2 O Ring Kit of 2 1
16 S-28219X-K4 O ring Kit of 4 1
17 SPA-13 Piston Spring 1
18 SPA-320-xx-K SPA-320P-xx-K
SPA-320N-xx-K
Stainless steel needle 0,5/0,7/0,85/1,0/1,2/1,4/1,6/1,8/2,2/2,8
Acetal Tipped Stainless Steel Needle 085-10 & 1,4
Hardened Needle 1,4 1
19 SPA-3 Housing 1
20 SPA-KK-1 Ring and ball for ratchet 1
21 3
22 SPA-31 Spring 1
23 SPA-37 Collar 1
24 SPA-49 Button 1
25 SPA-4 Adjusting knob 1
26* SPA-7-K Kit rear housing without adjustment (option F) 1
27 SPA-55-K Base plate (no baseplate option G) 1
28 SPA-56-K Quick Release Cam (28,28a & 8a) 1
28a SPA-59 Retaining screw 1
29* SS-659-CD Nut 1
30* AGGS-33 Mounting bar 1
31 S-14193 M6 Set Screw 5,5 long 1
32* SPA-111-K2 Kit of 2 plugs which replace manual air valve (13) (option P) 1
33 ADV-403-K Kit of retaining ring with seals 1
36 JGA-156-K5 Spring Clip Kit of 5 1
37 SPK-109 Manifold Seal Kit 10 (x4), 12b (x1) 1
38 SPK-118 Seal kit - 9, 11( x2), 14, 15c( x2), 15d 1
For the arrangement of the parts, refer to the exploded view on p3.5

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Patent No WO 6006055
EP 17868788

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OPTIONAL SPARE PARTS
AIR CAP CHART AVAILABLE
Air cap Type Air Flow
(L / min)
At Inlet
Pressure
(bar)
Fluid Flow
(ml / min) Pattern size (mm)
SP-100-430-K Conventional 340 3,5 200 - 280 200
SP-100-443-K Conventional 345 3,0 200 - 300 300
SP-100-470-K Conventional 465 3,0 500 - 1800 420
SP-100-497-K Conventional 510 3,5 200 - 600 380
SP-100-500R-K H V L P 195 1,0 130 –190 round
SP-100-505-K H V L P 385 1,4 130 –190 270
SP-100-510-K Trans-Tech 283 2,0 160 - 220 270
SP-100-513-K Trans-Tech 531 3,0 200 - 600 350
SP-100-515-K Trans-Tech 385 2.0 200 - 400 320
SP-100-522-K Trans-Tech 410 2,0 200 - 600 350
SP-100-523-K Trans-Tech 410 2,0 200 - 400 150
SP-100-590-K Trans-Tech 218 2,0 50 -150 150
SP-100-590HV-K Trans-Tech 310 2.0 50 - 150 120
SP-100-591-K Trans-Tech 218 2,0 50 -150 150
SP-100-520-K Trans-Tech 283 2.0 150 - 250 280
STANDARD COMBINATION RECOMMENDED.
Type Conventional HVLP Trans-Tech
Air Cap N° 430 443 470 497 500R 505 510 513 515 520 522 523 590 590HV 591
TIP Ø mm
0,5 X X X X
0,6 X X
0,7 X X X X
0,85 X X X X X X X X
1,0 X X X X X X X X X X X X X
1,2 X X X X X X
1,4 X X X X X
1,6 X X X X X
1,8 X X X X
2,0
2,2 X X X X
2,8 X
Combination « X » are available and fitted as standard.

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Model Part Number
CBA2 – 522 – 12 - [FPG]
=Type of gun – Air Cap – Ø Tip - [options]
Options
F – No Needle Adjustment (26)
P – No airflow valves (13). Fitted with plugs (32)
G – Gun only No manifold (27)
Type of Gun
CBA2 – XXX– XX : Spray gun complete with connecting plate.
CBA2U – XXX – XX : Spray gun assembly, with paint recirculation.
Aircap and Ø Tip
See table above
A Adjusting knob
B Gun head
C Air cap retaining ring
D Air Cap
E Valve (Atom & Fan)
F Body
G Fluid tip
H Base plate
I Base plate Locking lever
J Support tightening screw
K Support hole
P/R Fluid inlet

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INSTALLATION
HOSING :
Use separate filtered regulated air supplies for atomizing and cylinder
air.
Connect all the air and fluid hoses at the back of the plate (1/8” BSP):
(See figure)
- Cylinder air ‘C = Cyl’ via a control valve. For fast cylinder operation
the control valve should be fitted as close to the gun as possible or an
additional quick exhaust valve installed in the line.
- Separated atomizing and fan “F” &“A” air supply.
- Material hose ‘P’.
- Material hose ‘R’ for re-circulation model (CBA2U).
Recommended hose size up to 10m (34ft) long :
Atomization Air=8mm, Cylinder Air=6mm, Material=9,5mm
Important : To ensure that this equipment reaches you in first class
condition, protective coatings have been used. Flush the equipment
through with appropriate solvent before use.
Fix the spray gun base plate using mounting stem ref.30 and secure it with
nut ref.29..
SETTING
Check that the gun has all of the O-rings fitted on the sealing surface and check that the
locking device (28) is in the correct position to lock the spray gun on to the connecting plate.
1. The ATOM air valve controls the atomizing air pressure.
2. The FAN valve reduces the spray pattern size.
3. Fluid flow is adjusted with the rear ratchet knob (25).
For the arrangement of the parts, refer the exploded view at the end of the manual.
START UP
1. Turn the needle adjusting knob (25) clockwise until the needle is fully closed.
2. Turn the FAN and ATOM air valves (13) counter-clockwise to be full open.
3. Use the air cap chart above to set the air pressure at the air regulator to achieve
recommended pressures.
4. Turn the adjusting knob (25) counter clockwise to obtain the desired fluid flow.
5. Test spray. If the finish is too dry or fine, reduce the airflow by reducing the air inlet pressure
or by screwing the valve ATOM (13) in clockwise, or increase the fluid flow using ratchet knob,
rotating counter clockwise.
Important : The Spray gun must be earthed to dissipate any electrostatic
charges which may be created by fluid or air flows. This can be achieved
through the Spray gun mounting, or conductive air/fluid hoses. Electrical
bond from the spray gun to earth should be checked with an ohmmeter. A
resistance of less than 106Ohms is recommended.

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6. If the finish is too wet, turn the ratchet knob (25) in clockwise to reduce the fluid flow, or reduce
the fluid pressure.
If the atomization is too coarse, increase inlet air pressure, or reduce fluid flow.
7. The pattern size can be reduced by turning adjusting valve FAN (13) clockwise.
8. The spray pattern will give the best results when perpendicular to the target.
9. The recommended spray distance is 150-220 mm (6’’ to 8’’).
10. Spray edges first. Overlap each stroke a minimum of 50%. Move gun at a constant speed.
11. Always turn off air and fluid supply and relieve pressure and clean down when gun is not in us.
PREVENTIVE MAINTENANCE
Turn off air and coating supply and relieve pressure in the supply lines,
or disconnect from airline and fluid line.
1. Unlock the spray gun from the base plate, remove it, and if available re-attach an alternative
gun. Now the spray gun maintenance can be done outside the spray booth while production is
still continuing.
2. Remove air cap (1) and clean. If any of the holes in the cap are blocked with coating material
use a toothpick to clean. Never use metal wire which could damage the cap and produce
distorted spray patterns
3. Ensure the nozzle of the fluid tip (2) is clean and free from damage. Any build up of dried paint
can distort the spray pattern.
REPLACEMENT OF PARTS
Turn off air and coating supply and relieve pressure in the supply lines, before any
maintenance operation.
Tip (2) & needle (18)
Remove the air cap (1) by unscrewing its retaining ring counter- clockwise, remove the index ring if
it remains on the gun head (if fitted and used).
Remove the tip (2) and its air separator ring (3) by unscrewing counter- clockwise with 10mm
hexagonal spanner.
Unscrew the adjusting needle knob (25) fully in counter-clockwise rotation, push the needle from
the front of the spay gun, carefully so to avoid damage the needle end, then pull out the needle
(18) from the back.
If necessary, replace the needle and the tip, first refitting the tip with its air separator ring
(recommended torque between 9,5 to 12 Nm).
Lubricate all the surface of the needle which will be in contact with the packing and o ring. Slide
the needle into the spray gun from the back.
Fit the needle spring with its plastic pad (22,23,24) and replace the needle adjusting knob (25).
Packing seal (9)
Unscrew the air cap (1), tip (2) and its air separator ring (3).
Unscrew the 4 screws (6) to disassemble the gun head (8).
Push back the packing seal (9) using a 5,5mm diameter rod from the front of the gun head. Clean
the packing location hole carefully with adequate solvent.
Fit a new packing seal (9) U face towards the fluid passage.

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Fan & Atom air valve (13)
Before assembling, check the air valve is in fully open position by
unscrewing it counter-clockwise.
Piston (15), o ring (16, 14 15c& 15d)
Unscrew the rear housing (19) at the back of the gun body
counter clockwise, pull out the needle (18).
Use bent nose pliers “T” so to pull out the piston which has a
12mm internal groove for this purpose.
Piston Pand two valve “V” will go out at the same time.
The valve “V” can be removed from the piston ring.
We recommend to replace the full piston at the same time (Item
number SPA-60X-K).
It’s recommended to replace all the O-rings (14, 16 15d & 15c)
in the gun body as soon you disassemble the Piston from the
gun.
Lightly lubricate the piston O rings before fitting again into the
gun body.
OPTIONS
Rear housing without needle adjustment
Part number: SPA-7-K
This Kit includes the back piece and washer to replace the part items
19, 20, 21, 24, 25, on the exploded view.
Spray gun mounting bar
Part number: AGGS-33
Nut for mounting bar
Part number: SS-659-CD
Plug used when remote air control is required
Part number: SPA-111-K2, replace the air valve part (13)