Graco 311338J User Manual
Operation, Parts, Service, Repair
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
Important Safety Instructions
Read all warnings and instructions
in this manual. Save these instructions.
311338J
EN
GX-8 Model 297898
GX-8P Auto Model 297860
Models
Contents
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Important Two-Component Material Information . 5
Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . 5
Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . 5
Keep Components A and B(R) Separate . . . . . . 5
Moisture Sensitivity of Isocyanates . . . . . . . . . . . 5
Foam Resins with 245 fa Blowing Agents . . . . . . 6
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 . . . . . . . . . . . . . . . 18
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 . . . . . . . . . . . . . 25
Clean Mixing Module . . . . . . . . . . . . . . . . . . . . . 26
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
GX-8 Gun Final Assembly (297898) . . . . . . . . . 28
GX-8 Handle Assembly (297702) . . . . . . . . . . . 30
GX-8P Spray Gun Final Assembly (297860) . . . 32
GX-8P Auto Cylinder Assembly (297861) . . . . . 34
Auto GX-8P Optional Parts . . . . . . . . . . . . . . . . 36
Coupling Block Assembly (295383) . . . . . . . . . 37
Coupling Block (297902) . . . . . . . . . . . . . . . . . . 38
Coupling Block Assembly (24N996) . . . . . . . . . 39
Set-up Chart for GX-8P Modules . . . . . . . . . . . . . 40
GX-8P Model Specifications . . . . . . . . . . . . . . . 40
Tool Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 42
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 42
Models
Includes:
Part No. Description
Mix Module Tip Manifold
297898 ★ Gun, GX-8
297860 Gun, GX-8, Auto
24P633 ★ Gun, GX-8, with manifold 24N996 297911 296980
295338 (013) 297192 (201)
★
2 311338J
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
You must wear appropriate protective equipment when operating, servicing, or when in the
operating area of the equipment to help protect you from serious injury, including eye injury,
inhalation of toxic fumes, burns, and hearing loss. This equipment includes but is not limited to:
• Protective eyewear
• Clothing and respirator as recommended by the fluid and solvent manufacturer
•Gloves
• 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 MSDS’s to know the specific hazards of the fluids you are using.
• 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.
311338J 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 311338J
Important Two-Component Material Information
Important Two-Component Material Information
Isocyanates (ISO) are catalysts used in two
component materials.
Isocyanate Conditions
Spraying or dispensing materials containing isocyanates creates potentially harmful mists,
vapors, and atomized particulates.
Read material manufacturer’s warnings and
material MSDS to know specific hazards and
precautions related to isocyanates.
Prevent inhalation of isocyanate mists, vapors,
and atomized particulates by providing sufficient
ventilation in the work area. If sufficient ventilation is not available, a supplied-air respirator is
required for everyone in the work area.
To prevent contact with isocyanates, appropriate
personal protective equipment, including chemically impermeable gloves, boots, aprons, and
goggles, is also required for everyone in the work
area.
Moisture Sensitivity of Isocyanates
Exposure to moisture (such as humidity) will
cause ISO to partially cure; forming small,
hard, abrasive crystals, which 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.
Material Self-ignition
Some materials may become self-igniting if
applied too thick. Read material manufacturer’s
warnings and material MSDS.
Keep Components A and B(R) 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(R) wetted parts.
• Never use solvent on one side if it has been
contaminated from the other side.
• 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.
311338J 5
Important Two-Component Material Information
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.
6 311338J
Important Two-Component Material Information
311338J 7
Overall View
Overall View
Gun Block
Mounting Screw
Air Cap
Gun Block
FIG. 1: GX-8P Overall View
Manual
Valves
Coupling
Block
Safety Stop
125 PSI MAX
Air Cap Air
Adjustment
Valve
Trigger
Centerline Components
B-Screen Screw
Screen
Screen
Pattern Control
Disc (PCD)
PCD
Retainer
Gun Block
Air Cap
Retainer
Mixing
Module
B-Check
Valve
Coupling
Block Gasket
O-Ring
Screen
Retainer
A-Check
Valve
Coupling Block
Mounting Screw
Packing Nut
Rear Seal
Screen
Jam Nut
Valving Rod
Assembly
A-Screen
Screw
FIG. 2: GX-8P Centerline Components
8 311338J
Mixing Module
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.
Valving Rod
Assembly
Fan Spray
Pattern
Overall View
Mixing
Module
Round
Spray Pattern
FIG. 3: Mixing Module & PCD
Pattern
Control
Disc (PCD)
311338J 9
Operation Basics
1
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.
Disengage Safety Stop
To disengage safety stop, push in and turn
safety stop counterclockwise to place gun in
OPEN position.
Disengage the
Safety Stop
125 PSI MAX
FIG. 5: Safety Stop - Disengaged
Air Hose Connection
Safety Position
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.
Engage the
Safety Stop
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.
Pull Sleeve
125 PSI MAX
FIG. 4: Safety Stop - Engaged
10 311338J
Operation Basics
FIG. 6: Disconnect Air Hose
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.
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.
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.
Coupling
Block
Manual
Valves
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.
FIG. 7: Open Manual Valves
311338J 11
Operation Basics
3. Fit coupling block into gun block and insert
coupling block mounting screw. Use 5/16
in. nut driver to tighten to gun block.
B-Check
Valve
A-Check
Valve
Coupling Block
Gaskets
Coupling Screw
Mounting Screw
125 PSI MAX
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.
Pipe Plug
125 PSI MAX
Pipe
Nipple
Optional
Pipe Plug
FIG. 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.
FIG. 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 311338J
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.
Operation Basics
3. Install PCD:
a. Hold down gun trigger and thread PCD
retainer in place by hand.
b. Use 10 in. adjustable wrench to care-
fully 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).
311338J 13
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