Graco GX-8, GX-8P Operation, Parts, Service, Repair
Operation, Parts, Service, Repair
Important Safety Instructions
Read all warnings and instructions
in this manual. Save these instructions.
GX-8 Model 297898
GX-8P Auto Model 297860
GX-8P Spray Gun
For use with non-flammable polyurethane foams, two-component coating systems
(polyureas), and some two-component epoxy systems. For professional use only.
Not for use in explosive atmospheres.
3500 psi (24 MPa, 240 bar) Maximum Working Pressure
125 psi (90 KPa, 9 bar) Maximum Air Working Pressure
311338N
EN
Models
Contents
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Important Two-Component Material Information . 5
Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . 5
For all applications except spray foam . . . . . . . . 6
Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . 6
Keep Components A and B Separate . . . . . . . . . 6
Moisture Sensitivity of Isocyanates . . . . . . . . . . . 6
Foam Resins with 245 fa Blowing Agents . . . . . . 7
Changing Materials . . . . . . . . . . . . . . . . . . . . . . . 7
Overall View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Centerline Components . . . . . . . . . . . . . . . . . . . 8
Mixing Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Safety Position . . . . . . . . . . . . . . . . . . . . . . . . . 10
Air Hose Connection . . . . . . . . . . . . . . . . . . . . . 10
Coupling Block . . . . . . . . . . . . . . . . . . . . . . . . . 11
Air Inlet Configuration . . . . . . . . . . . . . . . . . . . . 12
Mixing Module and PCD Installation . . . . . . . . . 13
Valving Rod Adjustment . . . . . . . . . . . . . . . . . . 14
Initial Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Daily Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pressure Relief Procedure . . . . . . . . . . . . . . . . . . 17
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Gun Service Kits . . . . . . . . . . . . . . . . . . . . . . . . 18
Clean Spray Gun Procedure . . . . . . . . . . . . . . . 19
Flush Gun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Service Screen Screw . . . . . . . . . . . . . . . . . . . . 20
Remove Check Valve . . . . . . . . . . . . . . . . . . . . 20
Remove Centerline Components . . . . . . . . . . . 21
Install Centerline Components . . . . . . . . . . . . . 21
Replace End Cap and Air Piston Assembly . . . 22
Replace Trigger Valve O-Rings . . . . . . . . . . . . . 24
Clean Mixing Module . . . . . . . . . . . . . . . . . . . . . 25
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
GX-8 Gun Final Assembly (297898) . . . . . . . . . 27
GX-8 Handle Assembly (297702) . . . . . . . . . . . 29
GX-8P Spray Gun Final Assembly (297860) . . . 31
GX-8P Auto Cylinder Assembly (297861) . . . . . 33
Auto GX-8P Optional Parts . . . . . . . . . . . . . . . . 35
Coupling Block Assembly (295383) . . . . . . . . . . 36
Coupling Block (297902) . . . . . . . . . . . . . . . . . . 37
Coupling Block Assembly (24N996) . . . . . . . . . 38
Set-up Chart for GX-8P Modules . . . . . . . . . . . . . 39
GX-8P Model Specifications . . . . . . . . . . . . . . . 39
Tool Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 42
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 42
Models
Part No. Description
297898 Gun, GX-8
297860 Gun, GX-8, Auto
24P633 Gun, GX-8, with manifold 24N996 297911 296980
2 311338N
Includes:
Mix Module Tip Manifold
295338 (013) 297192 (201)
Starter
Kit
Not Included
Flushing
Kit
Warnings
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, 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
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.
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 Sheet (SDS) 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.
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.
• 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.
• Engage trigger lock when not spraying.
• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,
checking, or servicing equipment.
PRESSURIZED EQUIPMENT HAZARD
Fluid from the gun/dispense valve, leaks, or ruptured components can splash in the eyes or on skin and
cause serious injury.
• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,
checking, or servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
311338N 3
Warnings
WARNING
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. 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 arc).
• 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.
• Ground all equipment in the work area. See Grounding instructions.
• Use only grounded hoses.
• Hold gun firmly to side of grounded pail when triggering into pail.
• If there is static sparking or you feel a shock, stop operation immediately. 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 Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information
about your material, request MSDS forms from distributor or retailer.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
Graco/Gusmer replacement parts only.
• Do not alter or modify equipment.
• Use equipment only for its intended purpose. Call your Graco/Gusmer 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.
PRESSURIZED ALUMINUM PARTS HAZARD
Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or fluids
containing such solvents in pressurized aluminum equipment. Such use can cause serious chemical
reaction and equipment rupture, and result in death, serious injury, and property damage.
4 311338N
Important Two-Component Material Information
TOXIC FUMES
HAZARD
DO NOT ENTER DURING
SPRAY FOAM APPLICATION
OR FOR ___ HOURS AFTER
APPLICATION IS COMPLETE
DO NOT ENTER UNTIL:
DATE:
TIME:
____________
____________
Important Two-Component Material Information
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 Sheet (SDS) to know specific haz-
ards 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 SDS.
• 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 SDS.
• 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:
311338N 5
Important Two-Component Material Information
For all applications except spray
foam
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 Sheet (SDS) 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 SDS.
• Use of incorrectly maintained or mis-adjusted
equipment may result in improperly cured material. 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 SDS.
• 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.
Material Self-ignition
Some materials may become self-igniting if applied
too thick. Read material manufacturer’s warnings and
Safety Data Sheet (SDS).
Keep Components A and B
Separate
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.
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.
6 311338N
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.
Important Two-Component Material Information
• 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.
311338N 7
Overall View
125 PSI MAX
Trigger
Air Cap Air
Adjustment
Valve
Safety Stop
Gun Block
Air Cap
Gun Block
Manual
Coupling
Mounting Screw
Valves
Block
FIG. 1: GX-8P Overall View
B-Screen Screw
Screen
Gun Block
Screen
Mixing
Pattern Control
PCD
Air Cap
B-Check
Coupling
Coupling Block
A-Check
Screen
A-Screen
Screen
Rear Seal
Packing Nut
Valving Rod
Jam Nut
O-Ring
Module
Disc (PCD)
Retainer
Valve
Block Gasket
Mounting Screw
Valve
Retainer
Retainer
Screw
Assembly
FIG. 2: GX-8P Centerline Components
Overall View
Centerline Components
8 311338N
Mixing Module
Valving Rod
Mixing
Pattern
Fan Spray
Assembly
Pattern
Round
Spray Pattern
Module
Control
Disc (PCD)
FIG. 3: Mixing Module & PCD
Graco offers a variety of spray tip configurations to meet
most applications that spray fast-reaction chemical systems at low outputs. GX-8P spray tip components consist of a Pattern Control Disc (PCD) and a Mixing
Module (Figure 3). Tip components are available in a
range of sizes in both round and fan spray patterns.
Please contact your authorized Graco distributor to help
you determine the best configurations for your specific
application.
Overall View
311338N 9
Operation Basics
Engage the
Safety Stop
125 PSI MAX
125 PSI MAX
Disengage the
Safety Stop
Pull Sleeve
Operation Basics
To prevent accidental gun operation, always disconnect air supply before servicing gun or anytime gun is
not in use.
Grounding
Check your local electrical code and proportioner manual for detailed grounding instructions.
Ground spray gun through connection to
Graco-approved grounded fluid supply hose.
Safety Position
Disengage Safety Stop
To disengage safety stop, push in and turn safety stop
counterclockwise to place gun in OPEN position.
F
IG. 5: Safety Stop - Disengaged
Air Hose Connection
GX-8P guns have a two-position safety stop. When
engaged, it prevents accidental triggering of gun during
servicing or down time. When disengaged, it allows gun
to dispense.
Engage Safety Stop
To engage safety stop, push in and turn safety stop
clockwise to place gun in CLOSED safety position.
IG. 4: Safety Stop - Engaged
F
Connect Air Hoses
Pull back sleeve of female fitting, insert male fitting and
slide sleeve forward to secure connection.
Disconnect Air Hoses
Pull back sleeve of female fitting and pull out male fitting.
10 311338N
F
IG. 6: Disconnect Air Hose
Operation Basics
Coupling
Block
Manual
Valves
Coupling Block
Chemical hoses are joined to gun block by a coupling
block to ease installation and removal of gun.
Manual Valves
Two manual valves located on coupling block control
flow of each chemical component to gun.
Never open manual valve unless coupling block is
secured to gun or unless you point gun into waste container.
NOTE: Triggering gun with manual valves closed may
cause crossover if any residual chemical remains in gun
ports.
Open Manual Valves
Use 5/16 in. nut driver to turn manual valve counterclockwise approximately three full turns.
Close Manual Valves
Use 5/16 in. nut driver to turn manual valve fully clockwise.
To prevent accidental gun operation, always set
safety stop to CLOSED, close both manual valves,
and disconnect air supply.
Installation and Removal
To prevent release of pressurized chemicals, close
both manual valves before coupling block is removed.
Install Coupling Block
1. Replace nicked, damaged, or worn coupling block
gaskets.
2. Ensure A-(isocyanate) and B-(resin) check valves
are inserted into their proper recesses in gun block.
Isocyanate valve is notched for easy identification.
F
IG. 7: Open Manual Valves
311338N 11
Operation Basics
125 PSI MAX
B-Check
Valve
A-Check
Valve
Coupling Block
Gaskets
Coupling Screw
Mounting Screw
125 PSI MAX
Pipe Plug
Optional
Pipe Plug
Pipe
Nipple
3. Fit coupling block into gun block and insert coupling
block mounting screw. Use 5/16 in. nut driver to
tighten to gun block.
Air Inlet Configuration
There are two configurations for the air inlet. In the standard configuration, the air inlet is at base of handle. In
the alternate configuration, the air inlet is at rear of gun.
F
IG. 8: Install Coupling Block
Remove Coupling Block
1. CLOSE safety stop.
2. Disconnect air hose.
3. Close both manual valves.
4. Remove coupling block mounting screw.
5. Separate coupling block from gun.
6. Wipe mating surfaces of gun block and coupling
block to remove residual chemicals.
7. Cover exposed openings with grease.
NOTE: To avoid accidental gun operation, ensure coupling block manual valves are closed before attempting
to service gun, or any time gun is not in use.
F
IG. 9: Air Inlet Configuration
To change to alternate configuration:
1. Use 6 in. adjustable wrench to remove 4 in. pipe
nipple from base of gun.
2. Use 3/16 in. hex key to remove 1/8 in. pipe plug
from rear of gun.
3. Use 3/16 in. hex key to install 1/8 in. pipe plug in
location previously occupied by 4 in. pipe nipple.
4. Use 6 in. adjustable wrench to install pipe nipple in
location previously occupied by 1/8 in. pipe plug.
12 311338N
Mixing Module and PCD
Installation
1. Loosen air cap by hand and remove.
2. Install mixing module:
a. Disconnect gun from coupling block.
b. Connect air supply to gun.
c. Set safety stop to OPEN.
d. Hold down trigger and place module over tip of
valving rod.
e. Align keying pin with slot in gun block and keep
gun trigger held down.
3. Install PCD:
Operation Basics
a. Hold down gun trigger and thread PCD retainer
in place by hand.
b. Use 10 in. adjustable wrench to carefully tighten
PCD retainer until snug enough to ensure no
leak will occur.
c. Release gun trigger.
4. Install air cap and tighten by hand.
5. Adjust valving rod (see Valving Rod Adjustment,
page 14).
311338N 13
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