DeVilbiss COBRA 3C User manual

EN
Operation Manual
COBRA 3C –Automatic Spray Gun
SB-E-2-741 ISS.03
II 2 G X T6

2 © 2014 Finishing Brands UK Ltd.
Table of Contents
Topic
Page
Characteristics
3
EC Declaration of Conformity
3
Safety Warnings
4
Model Part Numbers
5
- Table 1: Air Cap Range
5
- Table 1: Fluid Nozzle & Needle Range
5
Specification & Materials of Construction
5
Exploded View
6
Parts List
7
Dimensions
8
Air Connection
9
Maintenance
10
Body Removal
10
Piston/Needle Removal
11
Needle Packing Removal
11
Fluid Nozzle Removal
12
Manifold O-ring and Connector Removal/ Assembly
12
Setting Micrometer
13
Air Cap Indexing (Optional)
13
Troubleshooting
14
Accessories
16
Warranty
16

3 © 2014 Finishing Brands UK Ltd.
Manual Operation
Cobra 3C Automatic Spray gun
Important - Read and follow all instructions and Safety Precautions
before using this equipment.
CHARACTERISTICS:
This automatic spray gun complies with ATEX regulations 94/9/EC, protection
level II 2 G X T6, suitable to use in zones 1&2.
This Cobra 3 is a production spray gun suitable for use with automatic and
semi-automatic machines in HVLP or Trans-Tech applications.
Remotely positioned valves (supplied by user) control all air supplies for
atomisation, fan size and triggering.
To handle a wide range of coating materials this spray gun is made from high
grade stainless steel.
IMPORTANT: These Spray guns are suitable for use with both water based
and solvent based coating materials. These guns are not designed for use
with highly corrosive and/or abrasive materials and if used with such materials
it must be expected that the need for cleaning and/or replacement of parts will
be increased. If there is any doubt regarding the suitability of a specific
material, contact your DeVilbiss Distributor or DeVilbiss direct. NOTE: This
gun is not to be used with halogenated hydrocarbon solvents or cleaning
agents such as 1, 1, 1,-Trichloroethane or methylene chloride. These solvents
can react with the aluminium components used in this gun. The reaction can
become violent and lead to an equipment explosion.
Fluid Tips and Needles are only available in hardened stainless steel.
Pressure feed material supply can be re-circulated or direct.
The needle adjustment knob has a micrometer control allowing fine and
accurate fluid flow control.
EC Declaration of Conformity
Finishing Brands UK Limited reserves the right to modify equipment specification without prior
notice
We, Finishing Brands UK Limited, Ringwood Rd, Bournemouth, Dorset, BH11 9LH, UK as
the manufacturer of the spray gun model Cobra 3C, 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 12100:2010, BS EN 1953:2013; and thereby conforms to the protection requirements of
Council Directive 2006/42/EC relating to Machinery Safety Directive, and;
EN 13463-1:2009, Council Directive 94/9/EC relating to Equipment and Protective Systems
Intended for Use in Potentially Explosive Atmospheres protection level II 2 G X T6.
D.Smith General Manager
14th March 2014

4 © 2014 Finishing Brands UK Ltd.
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.
Injection Hazard –Spray from the gun, hose leaks or ruptured components can inject fluid
through skin into the body and cause extremely serious injury including poisoning. GET
IMMEDIATE MEDICAL ATTENTION. INFORM THE DOCTOR WHAT TYPE OF MATERIAL
WAS INJECTED.
Do not put fingers or hand over the spray tip.
Replace all worn, damaged or loose parts immediately.
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.

5 © 2014 Finishing Brands UK Ltd.
Model Part Numbers
CBA3C - ##### - ### N
e.g. CBA3C-590-085N
Where:-
590= 590 Trans-Tech Air Cap
085=0.85mm Fluid Nozzle and Needle
N= Hardened Fluid Nozzle and Needle
e.g. CBA3C-590HV-10N
Where:-
590HV= 590HV HVLP Air Cap
10= 1.0mm Fluid Nozzle and Needle
N= Hardened Fluid Nozzle and Needle
Table 1: Air Cap Range
Air Cap Type
Part No.
Technology
Marking On Cap
590
SP-100-590-K
Trans-Tech
COM 590
590 HV
SP-100-590HV-ADV-K
HVLP
590 HV
Table 2: Hardened Fluid Nozzle and Needle Range
Fluid Nozzle Size
mm
Hardened
Fluid Nozzle
Hardened
Fluid Needle
Marking on
Fluid Needle
0.7
SP-259N-07-K
SPA-353-07-K
3C 07
0.85
SP-259N-085-K
SPA-353-085-K
3C 085
1.0
SP-259N-10-K
SPA-353-10-K
3C 10
Specification & Materials of Construction
Thread
Pressure
Air inlet Pattern + Length (P1)
1/8”BSP Female
P1 Max 12 bar / 174 psi
Fluid inlet & fluid recirculation (P2)
1/8”BSP Female
P2 Max 15 bar / 218 psi
Cylinder/trigger
1/8“ BSP Female
3.5 to 6 bar / 51 to 87 psi
Maximum temperature in use
40° C / 104°F
Spray gun weight
496 g / 17.5 oz.
Materials of construction
Gun body / Manifold / Micrometer Assembly
303 Stainless steel, 6082 Aluminium Alloy
Tip / Needle
Hardened 303 Stainless steel.
Fluid seals
Viton Extreme, Polyethylene, PTFE
Type of
Gun
Air Cap Type
(See Table 1)
Fluid Nozzle Size
(See Table 2)
Hardened

6 © 2014 Finishing Brands UK Ltd.

7 © 2014 Finishing Brands UK Ltd.
PARTS LIST
REF.
DESCRIPTION
PART NO.
QTY.
1
AIR CAP ASSEMBLY
SEE TABLE 1, p5
1
2
FLUID NOZZLE KIT
SEE TABLE 2, p5
3
FLUID NOZZLE
-
1
(a)
4
SEPARATOR - KIT OF 5
SP-626-K5
1
(a)
5
BODY
-
1
6
NEEDLE PACKING KIT
SPA-408-K
7
NEEDLE PACKING - KIT OF 2
SPA-118-K2
1
(b)
8
PACKING NUT
-
1
(b)
9
O-RING
-
1
(b)
10
PISTON ASSEMBLY
SPA-409-K
11
E CIRCLIP
1
12
O-RING
1
13
PISTON
1
14
O-RING
1
(c)
15
FLUID NEEDLE
SEE TABLE 2, p5
1
16
PISTON SPRING
SPA-123-K
1
17
MICROMETER ASSEMBLY
SPA-405-K
1
18
MANIFOLD ASSEMBLY
SPA-410-K
19
MANIFOLD
1
(d)
20
SCREW KIT
SPA-411-K
21
GRUB SCREW
2
(d)
22
M4 TORX SCREW
1
(d)
23
O-RING KIT
SPA-412P-K
24
O-RING
2
(d)
25
O-RING
3
(d)
26
ELBOW FITTING - KIT OF 2
SPA-136-K2
2
(d)
27
PUSH FITTING - KIT OF 3
SPA-137-K3
3
(d)
a= Included with Fluid Nozzle Kit
b= Included in Needle Packing Kit SPA-408-K
c= Included on Fluid Needle
d= Included with Manifold Assembly SPA-410-K

8 © 2014 Finishing Brands UK Ltd.
Dimensions
A - FLUID INLET (x2) 1/8” BSP
B- TRIGGER / CYLINDER AIR INLET 1/8” BSP
C- LENGTH AIR INLET 1/8” BSP
D- PATTERN AIR INLET 1/8” BSP
E- M6 MOUNTING HOLES (x2)
F- M4 BODY / MANIFOLD CONNECTION HOLE

9 © 2014 Finishing Brands UK Ltd.
Air Connection
Maintenance
Key to Symbols
Fan air supply
Pressure regulator
0-1 Bar / 0-15 psi recommended
12 Bar / 174 psi maximum
Trigger / Cylinder Air
3/2 Valve
3.5-6 Bar / 51-87 psi
Atom air supply
Pressure regulator
0-1 Bar / 0-15 psi recommended
12 Bar / 174 psi maximum
Lubricate with Petroleum Grease
Tool type & size required
Component direction arrow
For dis-assembly and sequence
number. (Reverse sequence to
Re-assemble).
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 Ohm meter.
A resistance of less than 106 Ohms is recommended
1

10 © 2014 Finishing Brands UK Ltd.
MAINTENANCE
Body Removal
T20
1
2
WARNING –Check all air and fluid pressure is removed before starting maintenance.
1.8-2.0 Nm
1.3-1.5 lbf.ft