Nordson A7A Reference guide

A7A Single and Dual Modular
Automatic Airless Spray Guns
Customer Product Manual
Part 1072609- 02
Issued 8/18
NORDSON CORPORATION AMHERST, OHIO USA
For parts and technical support, call the Industrial Coating
Systems Customer Support Center at [phone] or
contact your local Nordson representative.
This document is subject to change without notice.
Check http://emanuals.nordson.com for the latest version.

Part 1072609- 02 E2018 Nordson Corporation
Table of Contents
Safety 1.......................................
Qualified Personnel 1.........................
Intended Use 1..............................
Regulations and Approvals 1..................
Personal Safety 1............................
High-Pressure Fluids 2.....................
Fire Safety 2................................
Halogenated Hydrocarbon Solvent Hazards 3.
Action in the Event of a Malfunction 3...........
Disposal 3..................................
Description 4..................................
Nozzles 4...................................
Specifications 4..............................
Gun Module Components and Operation 5......
Installation 6..................................
Mounting 6..................................
Fluid Connections 6..........................
Trigger Air Connection 6......................
Nozzle Installation 7..........................
Maintenance 7................................
Troubleshooting 7.............................
Single Gun Repair 8...........................
Disassembly 8...............................
Cleaning and Inspection 8.....................
Assembly 8.................................
Dual Gun Repair 10.............................
Disassembly 10...............................
Cleaning and Inspection 10.....................
Assembly 10.................................
Parts 12.......................................
Single Gun Parts 12...........................
Dual Gun Parts 14............................
Options 16...................................
Service Kits 16...............................
Service Parts 16..............................
Contact Us
Nordson Corporation welcomes requests for information, comments, and
inquiries about its products. General information about Nordson can be
found on the Internet using the following address:
http://www.nordson.com.
Address all correspondence to:
Nordson Corporation
Attn: Customer Service
555 Jackson Street
Amherst, OH 44001
Notice
This is a Nordson Corporation publication which is protected by copyright.
Original copyright date 2005. No part of this document may be
photocopied, reproduced, or translated to another language without the
prior written consent of Nordson Corporation. The information contained
in this publication is subject to change without notice.
Trademarks
Nordson and the Nordson logo are registered trademarks of Nordson
Corporation.
Viton is a registered trademark of DuPont Dow Elastomers. L.L.C.

Change Record i
Part 1072609- 02
E2018 Nordson Corporation
Change Record
Revision Date Change
02 8/18 Added ATEX marking data to Specifications table.

Change Record
ii
Part 1072609- 02 E2018 Nordson Corporation

A7A Modular Automatic Airless Spray Gun 1
Part 1072609- 02
E2006 Nordson Corporation
A7A Modular Automatic Airless Spray Gun
Safety
Read and follow these safety instructions. Task-
and equipment-specific warnings, cautions, and
instructions are included in equipment
documentation where appropriate.
Make sure all equipment documentation, including
these instructions, is accessible to persons
operating or servicing equipment.
Qualified Personnel
Equipment owners are responsible for making sure
that Nordson equipment is installed, operated, and
serviced by qualified personnel. Qualified
personnel are those employees or contractors who
are trained to safely perform their assigned tasks.
They are familiar with all relevant safety rules and
regulations and are physically capable of
performing their assigned tasks.
Intended Use
Use of Nordson equipment in ways other than
those described in the documentation supplied with
the equipment may result in injury to persons or
damage to property.
Some examples of unintended use of equipment
include
Susing incompatible materials
Smaking unauthorized modifications
Sremoving or bypassing safety guards or
interlocks
Susing incompatible or damaged parts
Susing unapproved auxiliary equipment
Soperating equipment in excess of maximum
ratings
Regulations and Approvals
Make sure all equipment is rated and approved for
the environment in which it is used. Any approvals
obtained for Nordson equipment will be voided if
instructions for installation, operation, and service
are not followed.
Personal Safety
To prevent injury follow these instructions.
SDo not operate or service equipment unless you
are qualified.
SDo not operate equipment unless safety
guards, doors, or covers are intact and
automatic interlocks are operating properly. Do
not bypass or disarm any safety devices.
SKeep clear of moving equipment. Before
adjusting or servicing moving equipment, shut
off the power supply and wait until the
equipment comes to a complete stop. Lock out
power and secure the equipment to prevent
unexpected movement.
SRelieve (bleed off) hydraulic and pneumatic
pressure before adjusting or servicing
pressurized systems or components.
Disconnect, lock out, and tag switches before
servicing electrical equipment.
SWhile operating manual spray guns, make sure
you are grounded. Wear electrically conductive
gloves or a grounding strap connected to the
gun handle or other true earth ground. Do not
wear or carry metallic objects such as jewelry or
tools.
SIf you receive even a slight electrical shock,
shut down all electrical or electrostatic
equipment immediately. Do not restart the
equipment until the problem has been identified
and corrected.

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Personal Safety (contd)
SObtain and read Material Safety Data Sheets
(MSDS) for all materials used. Follow the
manufacturer’s instructions for safe handling
and use of materials, and use recommended
personal protection devices.
SMake sure the spray area is adequately
ventilated.
STo prevent injury, be aware of less-obvious
dangers in the workplace that often cannot be
completely eliminated, such as hot surfaces,
sharp edges, energized electrical circuits, and
moving parts that cannot be enclosed or
otherwise guarded for practical reasons.
High-Pressure Fluids
High-pressure fluids, unless they are safely
contained, are extremely hazardous. Always
relieve fluid pressure before adjusting or servicing
high pressure equipment. A jet of high-pressure
fluid can cut like a knife and cause serious bodily
injury, amputation, or death. Fluids penetrating the
skin can also cause toxic poisoning.
If you suffer a fluid injection injury, seek medical
care immediately. If possible, provide a copy of the
MSDS for the injected fluid to the health care
provider.
The National Spray Equipment Manufacturers
Association has created a wallet card that you
should carry when you are operating high-pressure
spray equipment. These cards are supplied with
your equipment. The following is the text of this
card:
WARNING: Anyinjurycausedbyhigh
pressure liquid can be serious. If you are
injured or even suspect an injury:
SGo to an emergency room immediately.
STell the doctor that you suspect an injection
injury.
SShow him this card
STell him what kind of material you were spraying
MEDICAL ALERT—AIRLESS SPRAY WOUNDS:
NOTE TO PHYSICIAN
Injection in the skin is a serious traumatic injury. It
is important to treat the injury surgically as soon as
possible. Do not delay treatment to research
toxicity. Toxicity is a concern with some exotic
coatings injected directly into the bloodstream.
Consultation with a plastic surgeon or a
reconstructive hand surgeon may be advisable.
The seriousness of the wound depends on where
the injury is on the body, whether the substance hit
somethingonitswayinanddeflectedcausing
more damage, and many other variables including
skin microflora residing in the paint or gun which
are blasted into the wound. If the injected paint
contains acrylic latex and titanium dioxide that
damage the tissue’s resistance to infection,
bacterial growth will flourish. The treatment that
doctors recommend for an injection injury to the
hand includes immediate decompression of the
closed vascular compartments of the hand to
release the underlying tissue distended by the
injected paint, judicious wound debridement, and
immediate antibiotic treatment.
Fire Safety
To avoid a fire or explosion, follow these
instructions.
SGround all conductive equipment. Use only
grounded air and fluid hoses. Check equipment
and workpiece grounding devices regularly.
Resistance to ground must not exceed one
megohm.
SShut down all equipment immediately if you
notice static sparking or arcing. Do not restart
the equipment until the cause has been
identified and corrected.
SDo not smoke, weld, grind, or use open flames
where flammable materials are being used or
stored.
SDo not heat materials to temperatures above
those recommended by the manufacturer.
Make sure heat monitoring and limiting devices
are working properly.

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SProvide adequate ventilation to prevent
dangerous concentrations of volatile particles or
vapors. Refer to local codes or your material
MSDS for guidance.
SDo not disconnect live electrical circuits when
working with flammable materials. Shut off
power at a disconnect switch first to prevent
sparking.
SKnow where emergency stop buttons, shutoff
valves, and fire extinguishers are located. If a
fire starts in a spray booth, immediately shut off
the spray system and exhaust fans.
SShut off electrostatic power and ground the
charging system before adjusting, cleaning, or
repairing electrostatic equipment.
SClean, maintain, test, and repair equipment
according to the instructions in your equipment
documentation.
SUse only replacement parts that are designed
for use with original equipment. Contact your
Nordson representative for parts information
and advice.
Halogenated Hydrocarbon Solvent
Hazards
Do not use halogenated hydrocarbon solvents in a
pressurized system that contains aluminum
components. Under pressure, these solvents can
react with aluminum and explode, causing injury,
death, or property damage. Halogenated
hydrocarbon solvents contain one or more of the
following elements:
Element Symbol Prefix
Fluorine F “Fluoro-”
Chlorine Cl “Chloro-”
Bromine Br “Bromo-”
Iodine I “Iodo-”
Check your material MSDS or contact your material
supplier for more information. If you must use
halogenated hydrocarbon solvents, contact your
Nordson representative for information about
compatible Nordson components.
Action in the Event of a
Malfunction
If a system or any equipment in a system
malfunctions, shut off the system immediately and
perform the following steps:
SDisconnect and lock out system electrical
power. Close hydraulic and pneumatic shutoff
valves and relieve pressures.
SIdentify the reason for the malfunction and
correct it before restarting the system.
Disposal
Dispose of equipment and materials used in
operation and servicing according to local codes.

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Description
The A7A single and dual modular automatic spray
guns are high-cycle, air-operated, airless spray
guns. They can be used for general finishing as
well as ultra-high speed applications using
solventborne or waterborne coatings.
Nozzles
Nozzles are not included with the spray guns. For
information on Nordson airless nozzles and help in
choosing the correct nozzle for your application,
contact your Nordson representative.
SINGLE DUAL
Gun Module
Manifold
Gun Module
Manifolds
Figure 1 A7A Modular Spray Guns
Specifications
Properties Specification
Maximum Fluid Pressure 207 bar (3000 psi)
Air Trigger Requirements 2.75–8.27 bar (40–120 psi)
Single Gun
Length: 89 mm (3.5 in.)
Width: 38.1 mm (1.5 in.)
Height: 73.2 mm (2.88 in.)
Weight: 0.86 kg (1.9 lb)
Dual Gun
Length: 108 mm (4.25 in.)
Width: 77.7 mm (3.06 in.)
Height: 73.2 mm (2.88 in.)
Weight: 2.31 kg (5.1 lb)
Fittings
Fluid Supply and Return 1/2-20JICx1/4-in. NPT
Trigger Air 1/4-in. tubing x 1/8-in. NPT
Mounting 13-mm (1/2-in.) round bar
ATEX Marking File ref. 0401
h IIB T6 Gb

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Gun Module Components and
Operation
The spray guns consist of a fluid/air/mounting
manifold and a gun module. This sectional view
shows the main components of the gun modules.
1
2
3
4
5
7
6
10
1
2
3
4
5
7
6
10
8
9
Figure 2 A7A Modular Spray Guns
1. Air cylinder
2. Compression spring
3. Piston assembly
4. Gun body
5. Packing cartridge
6. Ball tip
7. Seat
8. Seat retainer
9. Manifold
10. Nozzle nut
The packing cartridge stem connects the piston to
the ball tip. When the gun is triggered on, air
pressure pushes against the bottom of the piston,
lifting the ball tip away from the seat and allowing
coating material to flow through the seat and
nozzle.
When the gun is triggered off, the air pressure
forcing the piston up is released. The compression
spring and packing cartridge spring force the ball
tip against the seat, stopping the flow of coating
material out of the nozzle.
The packing cartridge seals prevent coating
material from entering the air cylinder. If the
packing cartridge seals start to leak, coating
material will flow out the weep holes in the gun
body.

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Installation
WARNING: Allow only qualified personnel
to perform the following tasks. Follow the
safety instructions in this document and all
other related documentation.
Figure 3 shows a typical single-gun coating system
installation.
WARNING: Ground all electrically
conductive equipment in the system. Use
only grounded fluid and air hoses.
1
23
4
5
6
7
7
8
9
7
10
11
12
Air Supply
1/2- 20 JIC Fluid Fittings
1/8-in. Trigger Air Fitting
Figure 3 Typical Circulating System
1. Pump
2. Heater
3. Filter
4. Solenoid valve
5. Air regulator
6. A7A gun
7. Ball valves
8. Circulation valve
9. Drain off rod
10. Waste container
11. Coating supply
12. Siphon hose and rod
Mounting
Slidea13-mm(
1/2-in.) round mounting bar through
theholeinthemanifold,orientthegunas
desired, and tighten the square head screw.
Fluid Connections
WARNING: In the fluid supply line, install
an approved pressure relief device set to
the lowest maximum working pressure of
all system components. The fluid hoses
must have a minimum burst pressure
greater than the pressure relief device
setting.
Fluid fittings have 1/2- 20 JIC threads. Connect the
fluid supply and return hoses to the fittings. Either
fitting can be used for supply or return.
Trigger Air Connection
Connect 1/8-inch tubing from a solenoid valve to the
trigger air fitting on the manifold.
For applications faster than 600 cycles per minute,
install the optional quick-exhaust valve at the air
inlet. To do this, remove the air fitting and install a
1/4-in. NPT nipple in the manifold, then install the
quick-exhaust valve on the nipple, and the air fitting
in the quick-exhaust valve.

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Nozzle Installation
Removethenozzlenutfromtheendofthegun.
Install your nozzle in the nozzle nut, then screw the
nut onto the gun. Tighten the nozzle nut securely.
NOTE: Make sure the nozzle and seat sealing
surfaces are clean before installing the nozzle.
Maintenance
Flush the gun periodically to keep it clean and free
of contaminants. As required, disassemble and
clean the gun and replace any worn parts.
Make sure the trigger air is clean and dry. If you
are operating the gun at high cycle rates for long
periods of time, install an air lubricator in the air
supply line. This will extend the life of the air piston
seal.
Troubleshooting
WARNING: Allow only qualified personnel to perform the following tasks. Follow the safety
instructions in this document and all other related documentation.
These procedures cover only the most common problems. If you cannot solve the problem with the
information given here, contact the Nordson Finishing Customer Support Center at (800) 433- 9319 or your
local Nordson representative for help.
Problem Possible Cause Corrective Action
1. Leaking around nozzle
or nozzle retaining nut
Dirty or damaged nozzle or seat
sealing surfaces
Tighten the nozzle nut. If the leak
persists, relieve system pressure.
Removethenozzlenutandcleanthe
nozzle and seat sealing surfaces. If
the leak persists, replace the nozzle
or seat (the ball tip and seat are a
matchedsetandmustbereplaced
together).
2. Leaking from weep
holes
Worn packing cartridge Replace the packing cartridge with
the appropriate kit. Refer to Parts.
3. Spitting Dirty or worn ball and seat Clean or replace the ball and seat.
Actuating or trigger air lines too
long
Mount the solenoid on or as close as
possible to the gun.
Air trapped in fluid system Purge air from system by opening the
drain valve until no air bubbles are
seen, or spraying until spitting stops.
Make sure the pump is not siphoning
air into the fluid system.
4. On/Off cycle response
poor or gun not
opening or closing
Air piston assembly worn or out of
adjustment
Adjust or replace the air piston
assembly.
Low air pressure to the solenoid
valve
Increase the air pressure to between
2.7- 4.1 bar (40- 60 psi).
Trigger air lines too long Mount the solenoid on or as close as
possible to the gun.
Fluid pressure too high Reduce the fluid pressure. The guns
will not close if their maximum
working pressure is exceeded.

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Single Gun Repair
WARNING: Allow only qualified personnel
to perform the following tasks. Follow the
safety instructions in this document and all
other related documentation.
WARNING: Shut off the fluid pump and
relieve the system fluid pressure before
disconnecting the fluid hoses from the
spray gun. High pressure fluid is
dangerous and can cause injection injuries.
See Figure 4. If you are using service kit 1056459,
to repair the single gun, you need only perform
steps 1- 4 of the Disassembly procedure, and
Steps 2- 4 of the Assembly procedure.
Disassembly
1. Flush the spray gun with clean solvent or
cleaning solution.
2. Relieve the system fluid and air pressure.
3. Remove the screws (15) and separate the gun
module from the manifold (17).
4. Remove the nozzle nut (14) and nozzle.
5. To disassemble the gun module:
a. Remove the O-rings (16) from the module.
b. Remove the air cylinder(4),gasket(5),and
compression spring (6).
c. Holdthepackingcartridgestem(11)witha
wrench and remove the lock nut (7).
Unscrew the piston assembly (8) from the
stem and separate the seal nut, O-ring and
piston (8A, 8B, 8C).
d. Remove the screws (13) and seat (12C).
e. Push or pull the packing cartridge out of the
gun body (10).
f. Unscrew the ball tip (12A) from the packing
cartridge stem.
Cleaning and Inspection
1. Clean the wetted parts with a compatible
cleaning solution.
2. Inspect the ball tip and seat. If either are worn
or damaged, replace both. The ball tip and
seat are a matched set and only sold as a kit.
3. Inspect the piston seal (8C). If it is worn or
damaged replace it.
4. Inspect all gaskets and O-rings. Replace any
that are damaged, using the service kit listed in
Parts.
5. If coating material was leaking from the weep
holes in the gun body, replace the packing
cartridge.
Assembly
1. To assemble the gun module:
a. Install the O-ring (9) in the internal groove in
the gun body.
b. Apply VC-3 thread-locking compound to the
bottom threads of the packing cartridge
stem (11).
c. Screw the ball tip (12A) onto the packing
cartridge stem.
d. Push the packing cartridge up into the gun
body.
e. Install the O-ring (12B) on the seat (12C).
f. Install the seat on the gun body and tighten
the screws (13) securely.
g. Threadthepistonassembly(8)ontothe
packing cartridge stem until it rests against
the gun body.
h. Thread the lock nut (7) part way down the
stem. Turn the piston assembly
counterclockwise 1/2to 3/4turn, until it is
0.016- 0.023 inches from the gun body.
Thread the lock nut down against the piston
assembly.
i. Apply a drop of VC-3 thread-locking
compound to the lock nut threads. Hold the
packingcartridgestemwithasmallwrench
while tightening the lock nut against the
piston assembly.
j. Install the compression spring (6) on top of
the piston.
k. Install the gasket and air cylinder. Tighten
the screws (2) securely.
2. Install the O-rings (16) in the gun body grooves.

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3. Install the nozzle in the nozzle nut (14), then
thread the nozzle nut on the seat and tighten it
securely.
4. Install the gun module (1) on the manifold (17)
and tighten the screws (15) securely.
2
1
4
5
6
7
8A
8B
8C
9
10
11
11A
12A
13
14
15 16
18
17
19
20
3
8
12
12B
12C Apply VC-3 thread-locking
compound to threads before
installing ball tip.
Apply VC-3 thread-locking
compound to threads before
tightening.
Apply pipe thread adhesive/
sealant (Loctite High Temp
SS567 or equivalent) to
threads before installing.
SERVICE NOTES:
Figure 4 Single Gun Repair

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Part 1072609- 02 E2006 Nordson Corporation
Dual Gun Repair
WARNING: Allow only qualified personnel
to perform the following tasks. Follow the
safety instructions in this document and all
other related documentation.
WARNING: Shut off the fluid pump and
relieve the system fluid pressure before
disconnecting the gun module from the
spray gun. High pressure fluid is
dangerous and can cause injection injuries.
See Figure 4. If you are using service kit 1059498,
to repair the dual gun, you need only perform steps
1- 5 of the Disassembly procedure, and steps 2- 4
of the Assembly procedure.
Disassembly
1. Flush the spray gun with clean solvent or
cleaning solution.
2. Relieve the system fluid and air pressure.
3. Remove the screws (21). Separate the gun
module (1) from the manifolds (23).
4. Remove the O-rings (22) from the gun body
grooves (10).
5. Remove the nozzle nut (20) and nozzle.
6. To disassemble each side of the gun module:
a. Remove the air cylinder(4),gasket(5),and
compression spring (6).
b. Hold the packing cartridge stem (11) with a
wrench and remove the lock nut (7).
Unscrew the piston assembly (8) from the
stem and separate the seal nut, O-ring and
piston (8A, 8B, 8C).
c. Remove the screws (19). Separate the gun
body (10) from the manifold (16).
d. Push or pull the packing cartridge out of the
bodies.
e. Unscrew the ball tip (12A) from the packing
cartridge stem.
f. Remove the large O-ring 13, seat retainer
(14), seat (12B), and small O-ring (15) from
the manifold.
Cleaning and Inspection
1. Clean the wetted parts with a compatible
cleaning solution.
2. The ball tips and seats are matched sets. If
either are worn or damaged, replace both.
3. Inspect the piston seal (8C). If it is worn or
damaged replace the piston (8).
4. Inspect all gaskets and O-rings. Replace any
that are damaged, using the service kit listed in
Parts.
5. If coating material was leaking from the weep
holes in the gun bodies, replace the packing
cartridges.
Assembly
1. Assemble each side of the module as follows:
a. If removed, install the O-ring (9) in the
internal groove in the body (10).
b. Apply VC-3 thread-locking compound to the
bottom threads of the packing cartridge
stem (11).
c. Screw the ball tip (12A) onto the packing
cartridge stem.
d. Push the packing cartridge up into the gun
body.
e. Install the seat (12B), O-ring (15), and seat
retainer (14) in the manifold (16).
f. Install the O-ring (13) on the seat retainer.
g. Install the body onto the manifold and
tighten the screws (19) securely.
h. Threadthepistonassembly(8)ontothe
packing cartridge stem until it rests against
the gun body.
i. Thread the lock nut (7) part way down the
stem. Turn the piston assembly
counterclockwise 1/2to 3/4turn, until it is
0.016- 0.023 inches from the gun body.
Thread the lock nut down against the piston
assembly.
j. Apply a drop of VC-3 thread-locking
compound to the lock nut threads. Hold the
packingcartridgestemwithasmallwrench
while tightening the lock nut against the
piston assembly.
k. Install the compression spring (6) on top of
the piston.

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l. Install the gasket (5) and air cylinder (4).
Install the screws (2) and lockwashers (3)
and tighten the screws securely.
2. Install the O-rings (22) into the gun body
grooves.
3. Install the nozzle in the nozzle nut (20), then
threadthenozzlenutontothemanifoldand
tighten it securely.
4. Install the module (1) on the manifolds (23) and
tighten the screws (21) securely.
2
4
5
6
7
8A
8B
8C
9
10
3
8
11
11A
12A
12B
13
14
15
16
19
20
21
23
Apply VC-3 thread-locking
compound to threads before
installing ball tip.
Apply VC-3 thread-locking
compound to threads before
tightening.
Apply pipe thread adhesive/
sealant (Loctite High Temp
SS567 or equivalent) to
threads before installing.
SERVICE NOTES:
22
1
Figure 5 Dual Gun Repair

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Parts
To order parts, call the Nordson Finishing Customer Support Center at [phone] or contact your local
Nordson representative.
Single Gun Parts
SeeFigure6.
Item Part Description Quantity Note
—1032379 GUN, A7A, stainless steel, LBS, with manifold 1
1------ SMODULE, A7A, stainless steel, Large Ball and
Seat
1 A
2981140 SS SCREW, fillet head, #10- 32 x 1.00 in.,
slotted, zinc
4 A
3983120 SS WASHER, lock, split, #10, steel, nickel 4 A
4------ SS CYLINDER, air 1 A
5153031 SS GASKET, gun, H20 1A, B
6342279 SS SPRING, compression, 0.75 x 0.72 x
0.06 in., stainless steel
1 A
7702118 SS NUT, lock, #10- 32, upper 1A, B
8138737 SS PISTON, H20/A7A H.P. assembly 1A, B
8A ------ SSS NUT, seal, lock 1A, B
8B 940090 SSS O-RING, Viton, 0.208 ID x 0.070 in. wide,
brown
1A, B
8C ------ SSS PISTON 1A, B
9940157 SS O-RING, Viton, black, 0.562 x 0.688 in. 1A, B
10 ------ SS BODY, gun 1 A
11 1039171 SS CARTRIDGE, packing, protective coating 1 A
11A 940134 SSS O-RING, Viton, 0.438 x 0.563 x 0.063 in. 1 A
12 ------ SS BALL TIP and seat 1A, C
12A ------ SSS BALL TIP 1A, C
12B 940174 SSS O-RING, Viton, black, 0.688 x 0.813 in. 1A, B, C
12C ------ SSS SEAT 1A, C
13 1051598 SS SCREW, flat head, socket, #10- 32 x
0.625 in., 17- 4 stainless steel
4 A
14 152496 SS NUT, retaining 1 A
15 981847 SSCREW, socket, 10- 32 x 1.625, zinc 4 A
16 940105 SO-RING, PTFE, 0.25 x 0.375 x 0.06 in. 3A, B
17 1054583 SMANIFOLD, A7A 1
18 981405 SSCREW, square, set, 3/8- 16 x 0.750 in., cup,
zinc
1
19 972029 SCONNECTOR, male, 37, 1/2-20x1/4in. NPT,
stainless steel
2
20 972716 SCONNECTOR, male, 1/4in. tube x 1/8in. NPT 1
NS 247646 SCARD, medical alert, injection 1 A
NS 152999 SWRENCH 1 A
NS 901905 SBRUSH 1 A
NS 901911 SWRENCH, adjustment, module 1 A
NOTE A: To replace order 1056459 Service Kit, Module, A7A, SS, LBS.
B: Included in 1072408 Service Kit, Rebuild, Modular A7A Guns.
C: Included in 320031 Kit, Ball and Seat, Nickel.
NS: Not Shown

A7A Modular Automatic Airless Spray Gun 13
Part 1072609- 02
E2006 Nordson Corporation
2
1
4
5
6
7
8A
8B
8C
9
10
11
11A
12A
13
14
15 16
18
17
19
20
3
8
12
12B
12C
Apply VC-3 thread-locking
compound to threads before
installing ball tip.
Apply VC-3 thread-locking
compound to threads before
tightening.
Apply pipe thread adhesive/
sealant (Loctite High Temp
SS567 or equivalent) to
threads before installing.
SERVICE NOTES:
Figure 6 Single Gun Parts

A7A Modular Automatic Airless Spray Gun
14
Part 1072609- 02 E2006 Nordson Corporation
Dual Gun Parts
Item Part Description Quantity Note
—1059500 GUN, A7A, dual, stainless steel, LBS, with
manifold
1
1------ SMODULE, A7A, dual, stainless steel, Large
Ball and Seat
1 A
2981140 SS SCREW, fillet head, #10- 32 x 1.00 in.,
slotted, zinc
8 A
3983120 SS WASHER, lock, split, #10, steel, nickel 8 A
4------ SS CYLINDER, air 2 A
5153031 SS GASKET, gun, H20 2A, B
6342279 SS SPRING, compression, 0.75 x 0.72 x
0.06 in., stainless steel
2 A
7702118 SS NUT, lock, #10- 32, upper 2A, B
8138737 SS PISTON, H20/A7A H.P. assembly 2A, B
8A ------ SSS NUT, seal, lock 2A, B
8B 940090 SSS O-RING, Viton, 0.208 ID x 0.070 in. wide,
brown
2A, B
8C ------ SSS PISTON 2A, B
9940157 SS O-RING, Viton, black, 0.562 x 0.688 in. 2A, B
10 ------ SS BODY, gun 2 A
11 1039171 SS CARTRIDGE, packing, protective coating 2 A
11A 940134 SSS O-RING, Viton, 0.438 x 0.563 x 0.063 in. 1 A
12 ------ SS BALL TIP and seat 2A, D
12A ------ SSS BALL TIP 1 D
12B ------ SSS SEAT 1 D
13 940174 SS O-RING, Viton, black, 0.688 x 0.813 in. 2A, B
14 134975 SS RETAINER, seat, A7A 2 A
15 940105 SS O-RING, PTFE, 0.250 x 0.375 x 0.06 in. 2A, B
16 ------ SS MANIFOLD, A7A dual, assembly 1 A
17 248932 SSS PLUG 2 A
18 900013 SSS BALL, 440 stainless steel, 0.125 in., 100 2 A
19 338693 SS SCREW, socket, #10- 32 x 1.25 in., stainless
steel
4 A
20 152496 SS NUT, retaining 1 A
21 981847 SSCREW, socket, 10- 32 x 1.625, zinc 8 A
22 940105 SO-RING, PTFE, 0.25 x 0.375 x 0.06 in. 6A, B
23 1054583 SMANIFOLD, A7A 2
24 981405 SSCREW, square, set, 3/8- 16 x 0.750 in., cup,
zinc
2
25 972029 SCONNECTOR, male, 37, 1/2-20x1/4in. NPT,
stainless steel
4
26 972716 SCONNECTOR, male, 1/4in. tube x 1/8in. NPT 2
27 331475 SPIN, dowel, 0.250 x 0.625 in., H & G 1 C
NS 247646 SCARD, medical alert, injection 1 A
NS 152999 SWRENCH 1 A
NS 901905 SBRUSH 1 A
NS 901911 SWRENCH, adjustment, module 1 A
NOTE A: To replace order 1059498 Service Kit, Gun, A7A, Dual, SS, LBS.
B: Included in 1072408 Service Kit, Rebuild, Modular A7A Guns.
C: Dowel pin fits into holes in sides of manifolds and joins them together.
D: To replace the ball and seat, order kit 337305.
NS: Not Shown

A7A Modular Automatic Airless Spray Gun 15
Part 1072609- 02
E2006 Nordson Corporation
2
4
5
6
7
8A
8B
8C
9
10
3
8
11
11A
12A
12B
13
14
15
16
19
20
21
Apply VC-3 thread-locking
compound to threads before
installing ball tip.
Apply VC-3 thread-locking
compound to threads before
tightening.
Apply pipe thread adhesive/
sealant (Loctite High Temp
SS567 or equivalent) to
threads before installing.
SERVICE NOTES:
22
17
18
27
1
Items 21- 27 are not
components of item 1
25
26
24
23
Figure 7 Dual Gun Parts

A7A Modular Automatic Airless Spray Gun
16
Part 1072609- 02 E2006 Nordson Corporation
Options
Part Description Note
159146 Mounting bar, gun, universal 46-cm (18-in.)
901262 Quick exhaust valve
973000 Nipple, steel, schedule 40, 1/8in. NPT, 0.75 in. long A
NOTE A: Use to install quick-exhaust valve.
Service Kits
Part Description Note
1072408 SERVICE KIT, Rebuild, Modular A7A Guns A
320031 KIT, Ball and Seat, Nickel B
NOTE A: Order two kits to rebuild a dual gun.
B: Used on single gun only.
Service Parts
Part Description Note
900424 COMPOUND, thread lock, VC-3
900481 ADHESIVE, pipe thread/hydraulic sealant