Graco GX-7A User manual

Instructions
GX-7A™, GX-7®DI, and GX-7 400
Spray Guns
For the application of non-flammable polyurethane foams, two-component coating
systems (polyureas), and some two-component epoxy systems. For professional use only.
See page 3 for model information.
3500 psi (24 MPa, 240 bar) Maximum Fluid Working Pressure
125 psi (0.86 MPa, 8.6 bar) Maximum Air Working Pressure
2!
GX-7A
GX-7 400
GX-7A DI
Important Safety Instructions
Read all warnings and instructions in this
manual before using the equipment.
Save these instructions.
Important Medical Information
Read the medical alert card provided with
the gun. It contains injection injury
treatment information for a doctor. Keep it
with you when operating the equipment.
311321V
EN

Related Manuals
2 311321V
Contents
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Important Isocyanate (ISO) Information . . . . . . . . . 6
Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . 6
Material Self-Ignition . . . . . . . . . . . . . . . . . . . . . . 7
Keep Components A and B Separate . . . . . . . . . 7
Moisture Sensitivity of Isocyanates . . . . . . . . . . . 7
Foam Resins with 245 fa Blowing Agents . . . . . . 7
Changing Materials . . . . . . . . . . . . . . . . . . . . . . . 7
Component Identification . . . . . . . . . . . . . . . . . . . . 8
Model GX-7A . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Model GX-7 DI . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Model GX-7 400. . . . . . . . . . . . . . . . . . . . . . . . . 10
Centerline Components . . . . . . . . . . . . . . . . . . . 11
Mixing Module . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Air Hose Connection . . . . . . . . . . . . . . . . . . . . . 15
Safety Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Manual Valves . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Coupling Block . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pressure Relief Procedure. . . . . . . . . . . . . . . . . 17
Flush Gun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Initial Set Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Daily Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 20
Optional Configuration . . . . . . . . . . . . . . . . . . . . . 21
Air Inlet Configuration . . . . . . . . . . . . . . . . . . . . 21
Install Mixing Module . . . . . . . . . . . . . . . . . . . . . 21
Install PCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Check Adjustment of Valving Rod . . . . . . . . . . . 22
Adjust Valving Rod. . . . . . . . . . . . . . . . . . . . . . . 23
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Gun Service Kits. . . . . . . . . . . . . . . . . . . . . . . . . 24
Clean Spray Gun . . . . . . . . . . . . . . . . . . . . . . . . 24
Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Service Screen Screw . . . . . . . . . . . . . . . . . . . . 26
Remove and Service Centerline Components . . 26
Install Centerline Components . . . . . . . . . . . . . . 28
Replace End Cap and Air Piston Assembly . . . . 29
Replace Trigger Valve O-Rings . . . . . . . . . . . . . 30
Clean Mixing Module . . . . . . . . . . . . . . . . . . . . . 31
Install Mixing Module . . . . . . . . . . . . . . . . . . . . . 32
Clean Pattern Control Disc . . . . . . . . . . . . . . . . . 32
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
GX-7A Assembly . . . . . . . . . . . . . . . . . . . . . . . . 34
GX-7 DI Assembly (295541). . . . . . . . . . . . . . . . 36
GX-7 400 Assembly (295540) . . . . . . . . . . . . . . 38
GX-7A Handle (24K734). . . . . . . . . . . . . . . . . . . 40
GX-7 DI Handle (295809). . . . . . . . . . . . . . . . . . 42
GX-7 400 Handle (24K733) . . . . . . . . . . . . . . . . 44
Coupling Block Assembly (295383) . . . . . . . . . . 46
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
GX-7A Mix Module Kit . . . . . . . . . . . . . . . . . . . . 47
Set-Up Chart for GX-7A Model. . . . . . . . . . . . . . 48
GX-7 400 Mix Module Kit . . . . . . . . . . . . . . . . . . 49
Set-up Chart for GX-7 400 Model. . . . . . . . . . . . 50
GX-7 DI Model Specifications. . . . . . . . . . . . . . . 51
Tip Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Tool Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Technical Specifications . . . . . . . . . . . . . . . . . . . . 53
California Proposition 65 . . . . . . . . . . . . . . . . . . . . 53
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 54
Related Manuals
Manuals are available at www.graco.com
Manual in
English Description
311340 Gusmer®Gun Service Kits
311341 Gusmer Directional Valve Kit

Models
311321V 3
Models
Part Description Includes:
Mix Module Tip
295540 GX-7 400 296859 (451) 296853 (212)
295541 GX-7 DI - 4/213 296901 (4) 296706 (213)
295542 GX-7A - 1/90 296909 (1) 296712 (90)
295543 GX-7A - 10/210 296906 (10) 296704 (210)
295544 GX-7A - 3/70 296226 (3) 296710 (70)
295545 GX-7A - 5/70 296923 (5) 296710 (70)
25E217 GX-7A - A3 Slabjacking 296876 (A3) Not included
25F046 GX-7A-A3 Slabjacking OEM 296566 (A3) Not Included

Warnings
4 311321V
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The
exclamation point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks.
When these symbols appear in the body of this manual or on warning labels, refer back to these Warnings.
Product-specific hazard symbols and warnings not covered in this section may appear throughout the body of this
manual where applicable.
WARNING
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled or
swallowed.
• Read Safety Data Sheets (SDSs) for handling instructions and to know the specific hazards of the
fluids you are using, including the effects of long-term exposure.
• When spraying, servicing equipment, or when in the work area, always keep work area
well-ventilated and always wear appropriate personal protective equipment. See Personal
Protective Equipment warnings in this manual.
• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
PERSONAL PROTECTIVE EQUIPMENT
Always wear appropriate personal protective equipment and cover all skin when spraying, servicing
equipment, or when in the work area. Protective equipment helps prevent serious injury, including
long-term exposure; inhalation of toxic fumes, mists or vapors; allergic reaction; burns; eye injury and
hearing loss. This protective equipment includes but is not limited to:
• A properly fitting respirator, which may include a supplied-air respirator, chemically impermeable
gloves, protective clothing and foot coverings as recommended by the fluid manufacturer and local
regulatory authority.
• Protective eyewear and hearing protection.
SKIN INJECTION HAZARD
High-pressure fluid from gun, hose leaks, or ruptured components will pierce skin. This may look like
just a cut, but it is a serious injury that can result in amputation. Get immediate surgical treatment.
• Engage safety lock when not spraying.
• Do not point gun at anyone or at any part of the body.
• Do not put your hand over the spray tip.
• Do not stop or deflect leaks with your hand, body, glove, or rag.
• Follow the Pressure Relief Procedure when you stop spraying and before cleaning, checking, or
servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses and couplings daily. Replace worn or damaged parts immediately.

Warnings
311321V 5
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. Paint or
solvent flowing through the equipment can cause static sparking. To help prevent fire and explosion:
• Use equipment only in well-ventilated area.
• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop
cloths (potential static sparking).
• Ground all equipment in the work area. See Grounding instructions.
• Never spray or flush solvent at high pressure.
• Keep work area free of debris, including solvent, rags and gasoline.
• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes
are present.
• Use only grounded hoses.
• Hold gun firmly to side of grounded pail when triggering into pail. Do not use pail liners unless they
are anti-static or conductive.
•Stop operation immediately if static sparking occurs or you feel a shock.Do not use equipment until
you identify and correct the problem.
• Keep a working fire extinguisher in the work area.
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system
component. See Technical Specifications in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical
Specifications in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For
complete information about your material, request Safety Data Sheets (SDSs) from distributor or
retailer.
• Turn off all equipment and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’s replacement parts only.
• Do not alter or modify equipment. Alterations or modifications may void agency approvals and create
safety hazards.
• Make sure all equipment is rated and approved for the environment in which you are using it.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
BURN HAZARD
Equipment surfaces and fluid that is heated can become very hot during operation. To avoid severe
burns:
• Do not touch hot fluid or equipment.
PRESSURIZED ALUMINUM PARTS HAZARD
Use of fluids that are incompatible with aluminum in pressurized equipment can cause serious chemical
reaction and equipment rupture. Failure to follow this warning can result in death, serious injury, or
property damage.
• Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or
fluids containing such solvents.
• Do not use chlorine bleach.
• Many other fluids may contain chemicals that can react with aluminum. Contact your material supplier
for compatibility.
WARNING

Important Isocyanate (ISO) Information
6 311321V
Important Isocyanate (ISO) Information
Isocyanates (ISO) are catalysts used in two component materials.
Isocyanate Conditions
Spraying or dispensing fluids that contain isocyanates creates potentially harmful mists, vapors, and atomized
particulates.
• Read and understand the fluid manufacturer’s warnings and Safety Data Sheets (SDSs) to know specific
hazards and precautions related to isocyanates.
• Use of isocyanates involves potentially hazardous procedures. Do not spray with this equipment unless you
are trained, qualified, and have read and understood the information in this manual and in the fluid
manufacturer’s application instructions and SDSs.
• Use of incorrectly maintained or mis-adjusted equipment may result in improperly cured material, which could
cause off gassing and offensive odors. Equipment must be carefully maintained and adjusted according to
instructions in the manual.
• To prevent inhalation of isocyanate mists, vapors and atomized particulates, everyone in the work area must
wear appropriate respiratory protection. Always wear a properly fitting respirator, which may include a
supplied-air respirator. Ventilate the work area according to instructions in the fluid manufacturer’s SDSs.
• Avoid all skin contact with isocyanates. Everyone in the work area must wear chemically impermeable
gloves, protective clothing and foot coverings as recommended by the fluid manufacturer and local regulatory
authority. Follow all fluid manufacturer recommendations, including those regarding handling of
contaminated clothing. After spraying, wash hands and face before eating or drinking.
• Hazard from exposure to isocyanates continues after spraying. Anyone without appropriate personal
protective equipment must stay out of the work area during application and after application for the time
period specified by the fluid manufacturer. Generally this time period is at least 24 hours.
• Warn others who may enter work area of hazard from exposure to isocyanates. Follow the recommendations
of the fluid manufacturer and local regulatory authority. Posting a placard such as the following outside the
work area is recommended:
TOXIC FUMES
HAZARD
DO NOT ENTER DURING
SPRAY FOAM APPLICATION
OR FOR ___ HOURS AFTER
APPLICATION IS COMPLETE
DO NOT ENTER UNTIL:
DATE:
TIME:
____________
____________

Important Isocyanate (ISO) Information
311321V 7
Material Self-Ignition
Keep Components A and B
Separate
Moisture Sensitivity of
Isocyanates
Exposure to moisture (such as humidity) will cause ISO
to partially cure, forming small, hard, abrasive crystal
that become suspended in the fluid. Eventually a film will
form on the surface and the ISO will begin to gel,
increasing in viscosity.
NOTICE
Partially cured ISO will reduce performance and the life
of all wetted parts.
• Always use a sealed container with a desiccant
dryer in the vent, or a nitrogen atmosphere. Never
store ISO in an open container.
• Keep the ISO pump wet cup or reservoir (if
installed) filled with appropriate lubricant. The
lubricant creates a barrier between the ISO and the
atmosphere.
• Use only moisture-proof hoses compatible with
ISO.
• Never use reclaimed solvents, which may contain
moisture. Always keep solvent containers closed
when not in use.
• Always lubricate threaded parts with an appropriate
lubricant when reassembling.
NOTE: The amount of film formation and rate of
crystallization varies depending on the blend of ISO, the
humidity, and the temperature.
Foam Resins with 245 fa
Blowing Agents
Some foam blowing agents will froth at temperatures
above 90°F (33°C) when not under pressure, especially
if agitated. To reduce frothing, minimize preheating in a
circulation system.
Changing Materials
NOTICE
Changing the material types used in your equipment
requires special attention to avoid equipment damage
and downtime.
• When changing materials, flush the equipment
multiple times to ensure it is thoroughly clean.
• Always clean the fluid inlet strainers after flushing.
• Check with your material manufacturer for
chemical compatibility.
• When changing between epoxies and urethanes or
polyureas, disassemble and clean all fluid
components and change hoses. Epoxies often
have amines on the B (hardener) side. Polyureas
often have amines on the B (resin) side.
Some materials may become self-igniting if applied
too thick. Read material manufacturer’s warnings and
Safety Data Sheets (SDSs).
Cross-contamination can result in cured material in
fluid lines which could cause serious injury or damage
equipment. To prevent cross-contamination:
•Never interchange component A and component
B wetted parts.
• Never use solvent on one side if it has been
contaminated from the other side.

Component Identification
8 311321V
Component Identification
Model GX-7A
2 !
A
H
G
F
E
B
C
D
FIG. 1
Key
A Forward Stop Locknut
B Gun Block
C Manual Valve
D Trigger
E Rear Packing Nut
F Valving Rod Forward Stop
G Air Cap Adjustment Valve
H Safety Lock
Key

Component Identification
311321V 9
Model GX-7 DI
B
M
CJ
D
N
P
K
H
G
FIG. 2
Key
B Gun Block
C Manual Valve
D Trigger
G Air Cap Adjustment Valve
H Safety Lock
J Coupling Block
K Piston Rod
M Air Cap
N Valving Rod
P Lock Nut
Key

Component Identification
10 311321V
Model GX-7 400
FIG. 3
!
2
D
A
H
G
F
E
B
Key
A Forward Stop Locknut
B Gun Block
D Trigger
E Rear Packing Nut
F Valving Rod Forward Stop
G Air Cap Adjustment Valve
H Safety Lock
Key

Component Identification
311321V 11
Centerline Components
Model GX-7A
FIG. 4
N
T
S
B
U
ZAJ
W
V
Z
ZAH
ZAE
ZAB
ZAD
M
ZAG
ZAC
ZAA
Y
Z
V
W
Key
B Gun Block
N Valving Rod
M Air Cap
S Rear Packing
T Rear Seal Retainer
U Rear Packing Retainer
V Screen
W Screen Screw Seal
Y R-Screen Screw
Z Check Valve
ZAA Coupling Block Gasket
ZAB Front Packing
ZAC Pattern Control Disc (PCD)
ZAD PCD Retainer
ZAE PCD Body
ZAG O-ring
ZAH Mixing Module
ZAJ A-Screen Screw
Key

Component Identification
12 311321V
Model GX-7 DI
FIG. 5
ZAP
S
B
ZAN
V
Y
Z
ZAH
ZAM
ZAC
M
ZAD
Z
V
ZAJ
ZAA
ZAR
Key
B Gun Block
M Air Cap
S Rear Packing
V Screen
Z Check Valve
ZAA Coupling Block Gasket
ZAC Pattern Control Disc (PCD)
ZAD PCD Retainer
ZAJ A-Screen Screw
ZAH Mixing Module
ZAM Mixing Module Retainer
ZAN Rear Seal Gland
ZAP Rear Seal Retainer Assembly
ZAR Coupling Block Mounting Screw
Key

Component Identification
311321V 13
Model GX-7 400
FIG. 6
N
U
T
S
ZAJ
W
V
Z
ZAR
ZAA
B
ZAC
ZAF
ZAD
ZAH
Z
ZAS
W
Y
Key
B Gun Block
M Air Cap
N Valving Rod
S Rear Packing
T Rear Seal Retainer
U Rear Packing Retainer
V Screen
W Screen Screw Seal
Y R-Screen Screw
Z Check Valve
ZAA Coupling Block Gasket
ZAC Pattern Control Disc (PCD)
ZAD PCD Retainer
ZAH Mixing Module
ZAJ A-Screen Screw
ZAR Coupling Block Mounting Screw
ZAS Spring
Key

Component Identification
14 311321V
Mixing Module
All gun models employ the concept of impingement
mixing through the use of a single-part MIXING
MODULE. This system is cleaned by a mechanical
self-cleaning process, eliminating the need for solvent or
air purging between dispenses.
The gun can be assembled with either a round or flat
mixing module, depending on the type of system used to
spray. The Set-Up Charts on pages 48 and 50 show
several of the more common sets of these
configurations.
The Mixing Module, in combination with a Pattern
Control Disc (PCD) (ZAC), produce a thoroughly mixed
chemical and reliable spray patterns. The module can
be set up to spray at its maximum rated output.
Additionally, by changing to a smaller PCD the module
can spray at the low outputs and pressures that are
required for detail work.
N
ZAH
(round or flat)
ZAC (round or flat)
N
ZAH (round or flat)
ZAC (round or flat)
N
ZAH (round or flat)
ZAC (round or flat)
GX-7A
GX-7A 400
GX-7 DI
FIG. 7 Mixing Modules

Operation
311321V 15
Operation
Grounding
Follow local codes, regulations, and your proportioner
manual for detailed grounding instructions.
Spray gun: ground the spray gun through connection to
a properly grounded fluid hose and pump.
Air Hose Connection
To connect air hoses: pull back the sleeve of the
female fitting, insert the male fitting and slide the sleeve
forward to secure connection.
To disconnect air hoses: pull back the sleeve of the
female fitting and pull out the male fitting.
Pull Sleeve
FIG. 8
Safety Lock
The CLOSED (SERVICE) position will not allow the gun
to discharge. The OPEN position allows the gun to
dispense. Whenever the gun is not spraying, set to
CLOSED (SERVICE) position.
To engage safety lock: push in and turn the safety lock
clockwise to place the gun in CLOSED (SERVICE)
position.
CLOSED (SERVICE)
Put in safety position when not
spraying.
FIG. 9: Safety Lock - Closed
To disengage safety lock: push in and turn the safety
lock counterclockwise to place the gun in OPEN position
(red band is exposed).
OPEN
Red band exposed to
spray.
Red Band
FIG. 10: Safety Lock - Open
To prevent accidental gun operation, always
disconnect air supply before servicing gun or anytime
gun is not in use.
The equipment must be grounded to reduce the risk
of static sparking. Static sparking can cause fumes to
ignite or explode. Grounding provides an escape wire
for the electric current.
High-pressure fluid from dispensing devices can
pierce skin. To help prevent serious injury from
pressurized fluid, always engage the piston safety
lock and close the material shutoff valves to avoid
accidental triggering whenever you stop spraying.

Operation
16 311321V
Manual Valves
NOTE: Triggering the gun with the manual valves (C)
closed may cause crossover if the gun ports contain
residual chemical.
Closing the manual valves (C) prevents chemicals in
heated hoses from entering the gun. Close the manual
valves before servicing gun.
To open the manual valves (C): Use a 5/16 in. nut
driver to turn the manual valve counterclockwise three
full turns. Do not open until it bottoms out.
To close the manual valves (C): turn the manual
valves clockwise until tight.
J
C
FIG. 11 Manual Valves
Coupling Block
Chemical hoses are joined to the gun block (B) by the
coupling block (J) to ease installation and removal of the
gun.
ZAA
ZAR
B
J
C
H
FIG. 12 Coupling Block
Install Coupling Block
1. Inspect the coupling block (J) gaskets for damage
and wear. Replace if necessary.
2. With gaskets in place, fit the coupling block (J) to
the gun block (B).
3. Insert the coupling block (J) mounting screw and
tighten securely with a 5/16 in. nut driver.
Remove Coupling Block
1. Set the safety lock (H) to CLOSED (SERVICE).
2. Disconnect the air hose.
3. Close both manual valves (C).
4. Remove the coupling block (J) mounting screw.
5. Separate the coupling block (J) from the gun.
6. Wipe the mating surfaces of the gun block (B) and
coupling block (J) to remove residual chemical.
7. Cover exposed openings with grease.
Never open manual valves (C) unless coupling block
(J) is secured to gun or exit port is directed into flush
pail.
To prevent release of pressurized chemical, close
both manual valves (C) before removing coupling
block (J).

Operation
311321V 17
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
ti39022a
C
OPEN
Red band exposed to
spray.
Red Band
ti39023a
H
ti39024a
CLOSED (SERVICE)
ti39025a
H
ti39026a
1. Close both manual valves (C).
2. Set the safety lock (H) to OPEN.
3. Trigger the gun once onto waste area to relieve fluid
pressure in front end of the gun.
4. Set the safety lock (H) to CLOSED (SERVICE).
5. Disconnect the gun air supply.
NOTE: If the gun is removed from the coupling block (J),
follow Clean Spray Gun, page 24.
NOTE: After the pressure in the spray gun is relieved,
the fluid in the hose and proportioner remains under
pressure. Follow the Pressure Relief Procedure in
your proportioner manual to relieve pressure in the
system.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection or splashing
fluid, follow the Pressure Relief Procedure when you
stop spraying and before cleaning, checking, or
servicing the equipment.

Operation
18 311321V
Flush Gun
CLOSED (SERVICE)
ti39025a
H
ti39022a
C
1. Set the safety lock (H) to CLOSED (SERVICE).
2. Close both manual valves (C).
3. Loosen the R-screen screw (Y) and then remove by
hand.
4. Use a flush can to thoroughly flush the screen screw
and screen screw cavity.
5. Loosen the A-Screen screw (ZAJ) and then remove
by hand.
6. Use a flush can to thoroughly flush the screen screw
and screen screw cavity.
7. Service the gun by following Maintenance
procedures, page 24.
Initial Set Up
ti39022a
C
1. Remove the coupling block (J) from the gun. Follow
Remove Coupling Block, page 16.
2. Install the female quick disconnect fitting to the air
supply hose bundled with the chemical supply
hoses.
3. Connect A-isocyanate hose (red-taped) to the
notched fitting on coupling block (J). Then connect
B-resin hose (blue-taped) to the fitting without
notches on coupling block.
4. Close both manual valves (C).
5. Pressurize the A and B chemical hoses and check
for leaks. (Refer to your proportioning system
manual.)
6. Bleed air from chemical hoses.
a. Use separate waste containers for A-ISO and
B-Resin.
b. Hold the coupling block (J) with exit ports
pointed into waste container.
c. Open the manual valves (C) one at a time to
dispense into waste container.
d. Bleed each side until chemical leaving hoses is
free of air.
e. Close both manual valves (C).
To avoid fire and explosion, always ground equipment
and waste container. To avoid static sparking and
injury from splashing, always flush at the lowest
possible pressure.

CLOSED (SERVICE)
ti39025a
H
Operation
311321V 19
7. Use a clean cloth soaked in gun cleaner to wipe
clean the coupling block (J) and mating surfaces.
NOTE: To avoid accumulation of dirt and other
contaminants, do not apply grease to mating surfaces of
the coupling block (J).
8. Set the safety lock (H) to CLOSED (SERVICE).
9. Install the coupling block (J) to the gun. Follow
Install Coupling Block, page 16.
10. Proceed with Daily Start-up and Daily Shutdown
procedures on page 19.
Daily Start-up
ti39022a
C
OPEN
Red band exposed to
spray.
Red Band
ti39023a
H
1. Connect the air supply to gun.
2. Adjust the air cap (M) adjustment valve (G). Turn
the knob counterclockwise to open valve and
clockwise to close valve
3. Adjust the rear seal retainer (T).
4. Close both manual valves (C).
5. Set the safety lock (H) to OPEN.
6. Test spray on a disposable surface and adjust the
spray pattern as needed.
Ensure the gun is attached to the coupling block (J)
and air hose, and the proportioning unit is at desired
temperature and pressure.

Operation
20 311321V
Daily Shutdown
OPEN
Red band exposed to
spray.
Red Band
ti39023a
H
NOTE: Follow when gun is out of service for any length
of time. Daily disassembly of gun for cleaning is not
recommended if it has been operating properly.
However, if you remove the gun from the coupling block
(J), flush and clean thoroughly.
1. Perform the Pressure Relief Procedure, page 17.
2. Set the safety lock (H) to OPEN.
3. Disconnect the air supply from the gun.
4. Shutdown the proportioning unit as required. See
your Proportioner manual, Related Manuals, page
2.
5. Clean the gun required. See Clean Spray Gun,
page 24.
NOTE: Do not disassemble the gun daily for cleaning if
it is operating properly. However, if the gun is removed
from the coupling block (J), it must be flushed and
cleaned thoroughly.