Graco GX-8 Quick start guide

Graco Inc. P.O. Box 1441 Minneapolis, MN 55440-1441

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

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)

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

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

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

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