Graco GX-8 Quick start guide

Graco Inc. P.O. Box 1441 Minneapolis, MN 55440-1441
Copyright 2006, Graco Inc. is registered to I.S. EN ISO 9001
311338B
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.
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.
GX-8 Model 297898
GX-8P Auto Model 297860

2311338B
Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overall View . . . . . . . . . . . . . . . . . . . . . . . . 5
Centerline Components . . . . . . . . . . . . . 5
Mixing Module . . . . . . . . . . . . . . . . . . . . 6
Operation Basics . . . . . . . . . . . . . . . . . . . . 7
Isocyanate Hazard . . . . . . . . . . . . . . . . . 7
Keep A and B Components Separate . . 7
Grounding . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Position . . . . . . . . . . . . . . . . . . . . 7
Air Hose Connection . . . . . . . . . . . . . . . 8
Coupling Block . . . . . . . . . . . . . . . . . . . . 8
Air Inlet Configuration . . . . . . . . . . . . . . 10
Mixing Module and PCD Installation . . 10
Valving Rod Adjustment . . . . . . . . . . . . 11
Initial Set Up . . . . . . . . . . . . . . . . . . . . . 12
Daily Start-up . . . . . . . . . . . . . . . . . . . . 13
Daily Shutdown . . . . . . . . . . . . . . . . . . 13
Pressure Relief Procedure . . . . . . . . . . . 14
Maintenance . . . . . . . . . . . . . . . . . . . . . . . 15
Gun Service Kits . . . . . . . . . . . . . . . . . 15
Clean Spray Gun Procedure . . . . . . . . 15
Flush Gun . . . . . . . . . . . . . . . . . . . . . . . 16
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Service Screen Screw . . . . . . . . . . . . .17
Remove Check Valve . . . . . . . . . . . . . .17
Remove Centerline Components . . . . .18
Install Centerline Components . . . . . . .18
Replace End Cap and Air Piston Assembly
19
Replace Trigger Valve O-Rings . . . . . . .22
Clean Mixing Module . . . . . . . . . . . . . .23
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
GX-8 Gun Final Assembly (297898) . . .24
GX-8 Handle Assembly (297702) . . . . .26
GX-8P Spray Gun Final Assembly
(297860) . . . . . . . . . . . . . . . . . . . . .28
GX-8P Auto Cylinder Assembly (297861)
30
Auto GX-8P Optional Parts . . . . . . . . . .32
Coupling Block Assembly (295383) . . .33
Coupling Block (297902) . . . . . . . . . . .34
Set-up Chart for GX-8P Modules . . . . .35
GX-8P Model Specifications . . . . . . . . .36
Tool Kits . . . . . . . . . . . . . . . . . . . . . . . .36
Technical Data . . . . . . . . . . . . . . . . . . . . .37
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Graco Standard Warranty . . . . . . . . . . . .39
Graco Information . . . . . . . . . . . . . . . . . .40

Warnings
311338B 3
Warnings
The following general warnings are for the setup, use, grounding, maintenance, and repair of this
equipment. Additional, more specific warnings may be found throughout the body of this manual
where applicable. Symbols appearing in the body of the manual refer to these general warnings.
When these symbols appear throughout the manual, refer back to these pages for a description
of the specific hazard.
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 surgi-
cal 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.
• Do not spray without tip guard and trigger guard installed.
• Engage trigger lock when not spraying.
•FollowPressure 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.
•FollowPressure 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.

Warnings
4311338B
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 com-
plete 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 infor-
mation.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot sur-
faces.
• 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 prop-
erty damage.
WARNING

Overall View
311338B 5
Overall View
Centerline Components
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
6311338B
Mixing Module
Graco offers a variety of spray tip configura-
tions to meet most applications that spray
fast-reaction chemical systems at low outputs.
GX-8P spray tip components consist of a Pat-
tern Control Disc (PCD) and a Mixing Module
(Figure 3). Tip components are available in a
range of sizes in both round and fan spray pat-
terns. Please contact your authorized Graco
distributor to help you determine the best con-
figurations for your specific application.
Valving Rod
Mixing
Pattern
Fan Spray
Assembly
Pattern
Round
Spray Pattern
Module
Control
Disc (PCD)
FIG. 3: Mixing Module & PCD

Operation Basics
311338B 7
Operation Basics
Isocyanate Hazard
Keep A and B Components
Separate
Grounding
Check your local electrical code and propor-
tioner manual for detailed grounding instruc-
tions.
Ground spray gun through connection to
Graco-approved grounded fluid supply hose.
Safety Position
GX-8P guns have a two-position safety stop.
When engaged, it prevents accidental trigger-
ing 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.
FIG. 4: Safety Stop - Engaged
Disengage Safety Stop
To disengage safety stop, push in and turn
safety stop counterclockwise to place gun in
OPEN position.
FIG. 5: Safety Stop - Disengaged
To prevent accidental gun operation, always
disconnect air supply before servicing gun or
anytime gun is not in use.
Read Material Safety Data Sheet (MSDS) to
know specific hazards of isocyanates. Use
equipment in a well-ventilated area. Wear
respirator, gloves, and protective clothing
when isocyanates are used.
CAUTION
To prevent cross-contamination of gun’s wet-
ted parts, do not interchange A component
(isocyanate) and B component (resin) parts.
Gun is shipped with A side on left.
Engage the
Safety Stop
125 PSI MAX
125 PSI MAX
Disengage the
Safety Stop

Operation Basics
8311338B
Air Hose Connection
Connect Air Hoses
Pull back sleeve of female fitting, insert male
fitting and slide sleeve forward to secure con-
nection.
Disconnect Air Hoses
Pull back sleeve of female fitting and pull out
male fitting.
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.
Open Manual Valves
Use 5/16 in. nut driver to turn manual valve
clockwise approximately three full turns.
FIG. 7: Open Manual Valves
Pull Sleeve
Triggering gun with manual valves closed
may cause crossover if any residual
chemical remains in gun ports.
Never open manual valve unless coupling
block is secured to gun or unless you point
gun into waste container.
Coupling
Block
Manual
Valves

Operation Basics
311338B 9
Close Manual Valves
Use 5/16 in. nut driver to turn manual valve
fully counterclockwise.
Installation and Removal
Install Coupling Block
1. Replace nicked, damaged, or worn cou-
pling 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.
3. Fit coupling block into gun block and insert
coupling block mounting screw. Use 5/16
in. nut driver to tighten to gun block.
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 chemi-
cals.
7. Cover exposed openings with grease.
CAUTION
To prevent accidental gun operation, always
set safety stop to CLOSED, close both man-
ual valves, and disconnect air supply.
To prevent release of pressurized chemicals,
close both manual valves before coupling
block is removed.
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.
125 PSI MAX
B-Check
Valve
A-Check
Valve
Coupling Block
Gaskets
Coupling Screw
Mounting Screw

Operation Basics
10 311338B
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.
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.
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:
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 11).
125 PSI MAX
Pipe Plug
Optional
Pipe Plug
Pipe
Nipple