Graco 311321M User Manual

Operation, Parts, Service, Repair

GX-7A™, GX-7® DI, and GX-7 400

311321M

Spray Guns

For use with non-flammable polyurethane foams, two-component coating systems (polyureas), and some two-component epoxy systems. For professional use only.

See page 2 for model information.

3500 psi (24 MPa, 240 bar) Maximum Working Pressure

Important Safety Instructions

Read all warnings and instructions in this manual. Save these instructions.

GX-7A

GX-7 400

GX-7 DI

Models

Contents

Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Overall View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Centerline Components . . . . . . . . . . . . . . . . . . . 8

Mixing Module . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Isocyanate Hazard . . . . . . . . . . . . . . . . . . . . . . 11

Keep A and B Components Separate . . . . . . . . 11

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Safety Position . . . . . . . . . . . . . . . . . . . . . . . . . 11

Air Hose Connection . . . . . . . . . . . . . . . . . . . . . 12

Coupling Block . . . . . . . . . . . . . . . . . . . . . . . . . 13

Air Inlet Configuration . . . . . . . . . . . . . . . . . . . . 14

Mixing Module and PCD Installation . . . . . . . . . 15

Valving Rod Adjustment . . . . . . . . . . . . . . . . . . 16

Initial Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Daily Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 18

Pressure Relief Procedure . . . . . . . . . . . . . . . . . . 19

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Gun Service Kits . . . . . . . . . . . . . . . . . . . . . . . . 20

Clean Spray Gun Procedure . . . . . . . . . . . . . . . 20

Flush Gun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Service Screen Screw . . . . . . . . . . . . . . . . . . . . 22

Remove Centerline Components . . . . . . . . . . . 22

Install Centerline Components . . . . . . . . . . . . . 24

Replace End Cap and Air Piston Assembly . . . 25

Replace Trigger Valve O-Rings . . . . . . . . . . . . . 26

Clean Mixing Module . . . . . . . . . . . . . . . . . . . . . 27

Install Mixing Module . . . . . . . . . . . . . . . . . . . . . 28

Clean Pattern Control Disc . . . . . . . . . . . . . . . . 29

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

GX-7A Model Final Assembly . . . . . . . . . . . . . . 30

GX-7 DI Model Final Assembly (295541) . . . . . 32

GX-7 400 Model Final Assembly (295540) . . . . 34

GX-7A Model Handle Assembly (24K734) . . . . 36

GX-7 DI Model Handle Assembly (295809) . . . 38 GX-7 400 Model Handle Assembly (24K733) . . 40

Coupling Block Assembly (295383) . . . . . . . . . . 42

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

GX-7A Mix Module Kit . . . . . . . . . . . . . . . . . . . . 43

Set-Up Chart for GX-7A Model . . . . . . . . . . . . . 44

GX-7 400 Mix Module Kit . . . . . . . . . . . . . . . . . . 45

Set-up Chart for GX-7 400 Model . . . . . . . . . . . 46

GX-7 DI Model Specifications . . . . . . . . . . . . . . 47

Tip Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Tool Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 50

Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 50

Models

Includes:

Part No. Description

295540 GX-7 400 296859 (451)

295541 GX-7 DI - 4/213 296901 (4)

295542 GX-7A - 1/90 296909 (1)

295543 GX-7A - 10/210 296906 (10)

295544 GX-7A - 3/70 296226 (3)

295545 GX-7A - 5/70 296923 (5)

2 311321M

Mix Module Tip

296853 (212)

296706 (213)

296712 (90)

296704 (210)

296710 (70)

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

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.

• Do not spray without tip guard and trigger guard installed.

• Engage trigger lock when not spraying.

•Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning, checking, or servicing equipment.

311321M 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 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 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.

4 311321M

Warnings

WARNING

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.

311321M 5

Overall View

2 !

Overall View

Model GX-7A

Gun Block

Manual Valves

FIG. 1: GX-7A Overall View

Forward Stop Locknut

Valving Rod Rear Stop

Air Cap Adjustment Valve

Valving Rod Forward Stop

Rear Packing Nut

Trigger

Model GX-7 DI

. 2: GX-7 DI Overall View

6 311321M

Overall View

Model GX-7 400

Gun Block

Trigger

FIG. 3: GX-7 400 Overall View

Forward Stop Locknut

Valving Rod Rear Stop

Air Cap Valve

Valving Rod

Forward Stop

Rear Packing Nut

311321M 7

Overall View

Centerline Components

Model GX-7A

Valving Rod

Rear Packing

Packing

Nut

Rear Packing Retainer

Screen

Screw Seal

Check Valve Assembly

R-Screen Screw

FIG. 4: GX-7A Centerline Components

Gun Block

Coupling Block Gasket

A-Screen Screw

Check Valve

Front Packing

Pattern Control Disc (PCD)

Mixing Module

PCD Retainer

Screen Screw Seal

Screen

PCD Body

O-ring

Air Cap

Model GX-7 DI

Check Valve

Mixing Module

Mixing Module Retainer

PCD Retainer

Air Cap

. 5: GX-7 DI Centerline Components

R-Screen Screw

Screen

Gun Block

Pattern Control Disc (PCD)

Rear Seal Gland

Rear Packing

Coupling Block Gasket

Coupling Block Mounting Screw

Rear Seal Retainer Assembly

Check Valve

Screen

A-Screen Screw

8 311321M

Model GX-7 400

Overall View

R-Screen Screw

Screen Screw Seal

Check Valve

Mixing Module

Pattern Control

Disc (PCD)

Air Cap

Spring

PCD Retainer

Coupling Block Gasket

Coupling Block Mounting Screw

Rear Packing

Retainer

Gun Block

Rear Packing

Valving Rod

Rear Seal Retainer

Check Valve

Screen

Screen Screw Seal

A-Screen Screw

FIG. 6: GX-7 400 Centerline Components

311321M 9

Overall View

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.

Valving Rod

The gun can be assembled with two styles of mixing components; their selection is dependent upon the type of system sprayed. The Set-Up Charts on pages 44 and 46 show several of the more common sets of these configurations.

The Mixing Module, in combination with a Pattern Control Disc (PCD), 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.

PCD (round or flat)

Valving Rod

Mixing Module (round or flat)

PCD (round or flat)

. 8: GX-7 400 Mixing Module

Mixing Module (round or flat)

PCD (round or flat)

. 9: GX-7 DI Mixing Module

Valving Rod

Mixing Module (round or flat)

FIG. 7: GX-7A Mixing Module

10 311321M

Operation Basics

To prevent accidental gun operation, always disconnect air supply before servicing gun or anytime gun is not in use.

Isocyanate Hazard

Spraying 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.

Operation Basics

Grounding

Check your local electrical code and proportioner manual for detailed grounding instructions.

Ground the spray gun through connection to a Graco-approved grounded fluid supply hose.

Safety Position

The guns have a two-position valving rod rear stop. The SERVICE position allows for minimal rearward travel of valving rod but will not allow chemical to discharge. The OPEN position allows full rearward travel of valving rod and permits gun to dispense. Whenever gun is not spraying, set to SERVICE position.

Engage Safety Stop

To engage safety stop, push in and turn safety stop clockwise to place gun in CLOSED (SERVICE) position.

Keep A and B Components Separate

CLOSED (SERVICE)

CAUTION

To prevent cross-contamination of the gun’s wetted parts, do not interchange A component (isocyanate) and B component (resin) parts. The gun is shipped with the A side on the left.

311321M 11

FIG. 10: Safety Stop - Closed

When not spraying in safety position.

Operation Basics

Disengage Safety Stop

To disengage safety stop, push in and turn safety stop counterclockwise to place gun in OPEN position (red band is exposed).

Red Band

OPEN

Red band exposed when spraying.

FIG. 11: Safety Stop - Open

Close Manual Valves

Air Hose Connection

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

Closing manual valves prevents chemicals in heated hoses from entering gun. For your own safety, close manuals valves before servicing gun.

Manual Valves rotate clockwise to close.

FIG. 12: Close Manual Valves

FIG. 13: Disconnect Air Hose

12 311321M

Operation Basics

Coupling Block

Chemical hoses are joined to gun block by 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.

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.

Close Manual Valves

Use 5/16 in. nut driver to turn manual valve fully clockwise.

CAUTION

To prevent accidental gun operation, always set safety stop to CLOSED (SERVICE), close both manual valves, and disconnect air supply.

Installation and Removal

To prevent release of pressurized chemicals, close both manual valves before removing coupling block.

Install Coupling Block

1. Replace nicked, damaged, or worn coupling block gaskets.

Open Manual Valves

Use 5/16 in. nut driver to turn manual valve counterclockwise three full turns.

Coupling Block

Manual Valves

FIG. 14: Open Manual Valves

2. With gaskets in place, fit coupling block to gun block.

311321M 13

Operation Basics

3. Insert coupling block mounting screw and use 5/16 in. nut driver to tighten to gun block.

Coupling Block

Gaskets

Coupling Block Mounting Screw

Optional Configuration

Refer to page 42. If bottom-mount hose connection is desired, alternate swivel fitting (2 and 3) with pipe plugs (1). Use pipe thread sealant. Do not cross-over which side each fitting is on.

Air Inlet Configuration

There are two configurations for the air inlet. In the standard configuration the air inlet is at the base of the handle, and in the alternate configuration the air inlet is at the rear of the gun.

Pipe Plug

FIG. 15: Install Coupling Block

Remove Coupling Block

1. Set safety stop to CLOSED (SERVICE).

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 chemical.

7. Cover exposed openings with grease.

Optional Pipe Nipple

Pipe Nipple

FIG. 16: Air Inlet Configuration

To change to alternate configuration,

1. Remove pipe nipple.

2. Remove pipe plug from rear of gun.

3. Install pipe plug in location previously occupied by pipe nipple.

4. Install pipe nipple in location previously occupied by pipe plug.

14 311321M

Operation Basics

Mixing Module and PCD Installation

1. 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 hole in gun block

and push in firmly (GX-7 DI model only).

f. Install front packing into module retainer

(GX-7 model only).

f. Use wrench to loosen piston locknut.

Turn valving rod rearward as far as it will turn.

g. Place and orient PCD over mixing mod-

ule retainer.

h. Install PCD retainer and hand tighten

(GX-7 DI model only).

i. Install PCD retainer and wrench tighten

(GX-7 model only).

3. Adjust valving rod. See procedure for appropriate gun model.

4. Set safety stop to OPEN position.

5. Check adjustment of valving rod:

g. Install module retainer, hand tight.

Release trigger.

h. Use wrench to strongly tighten module

retainer (250 in.-lbs.). GX-7 DI model only: use wrench to tighten module retainer (150 in.-lbs.). DO NOT OVERTIGHTEN.

2. Install PCD:

a. Disconnect air supply from gun.

b. Loosen forward stop screw (GX-7

model only).

c. Turn forward stop nut clockwise (as

viewed from front of gun) 1-2 turns (GX-7 model only).

a. With air supply connected, hold down

gun trigger and loosen PCD retainer. Release trigger.

b. Hand tighten PCD retainer.

c. While maintaining tightening torque,

trigger gun. Retainer should rotate approximately 1/10 of turn.

d. Release trigger.

d. Slightly loosen rear seal retainer

assembly.

e. Remove safety stop.

311321M 15

Operation Basics

Valving Rod Adjustment

GX-7A and GX-7 400 Models Only

1. Push in rear stop to SERVICE position.

2. If attached, turn both manual valves fully

clockwise to close (see Manual Valves, page 13).

3. Connect air line from gun to air source to pressurize air cylinder forward to CLOSED position.

FIG. 18: One Wrench Flat

4. Loosen forward stop locknut.

Forward Stop Locknut

Forward Stop

FIG. 17: Forward Stop

5. Completely loosen (full CCW) forward

stop. Then slowly tighten (CW) forward stop until a snug resistance is felt. From this point, reverse and loosen approximately 1/16 of a turn.

6. Tighten forward stop locknut. Do not overtighten. If locknut bottoms out before resistance is felt, replace friction plug.

Valving Rod Adjustment

GX-7 DI Model Only

Valving rod requires adjustment in only the following instances:

• disassembly and service of air cylinder

• changing valving rod

• changing mixing module

1. Clean gun according to Clean Spray Gun Procedure, page 20.

2. Connect air supply to gun.

3. Loosen rear seal retainer assembly one or two turns.

4. Loosen locknut from valving rod three or four turns.

5. Set safety stop to OPEN.

6. Use 5/16 in. nut driver through rear of gun to thread valving rod forward to engage PCD. When valving rod contacts PCD tighten another 1/10 turn.

7. Carefully maintain position of valving rod

As a reference point, movement of one

and tighten locknut against piston rod.

wrench flat corresponds to 1/6 turn.

8. Retighten rear seal retainer assembly.

16 311321M

Initial Set Up

1. Install female quick disconnect fitting to air supply hose bundled with chemical supply hoses.

2. Connect coupling block to hose bundle. Connect A-Isocyanate hose (red-tape) to notched fitting on coupling block. Connect R-Resin hose (blue-tape) to fitting without notches on coupling block.

3. Close both manual valves.

Operation Basics

5. Bleed air from chemical hoses.

a. Use separate waste containers for

A-ISO and R-Resin.

b. Hold coupling block with exit ports

pointed into waste container.

c. Open one manual valve at a time to dis-

pense into waste container.

d. Bleed each side until chemical leaving

hoses is free of air.

4. Pressurize A and R chemical hoses. Check for leaks. See Proportioner manual.

e. Close both manual valves.

6. Use cloth soaked in gun cleaner to clean coupling block and mating surfaces.

7. Set safety stop to CLOSED (SERVICE).

8. Install coupling block to gun.

9. Proceed with daily start-up and shutdown procedures.

311321M 17

Operation Basics

Daily Start-up

Ensure gun is attached to coupling block and air hose. Ensure proportioning unit is at desired temperature and pressure. Properly ground equipment to avoid static sparking that may result in fire or explosion.

1. Connect air supply to gun.

2. Adjust air cap adjustment valve. Turn knob counterclockwise to open valve and clockwise to close valve

3. Adjust rear seal retainer.

4. Open both manual valves. See Coupling Block section, page 13.

5. Set safety stop to OPEN.

Daily Shutdown

Follow daily shutdown procedure when gun is out of service for any length of time, or for mid- or end-of-day service. See Clean Spray Gun Procedure, page 20.

1. Set safety stop to OPEN.

2. Close both manual valves.

3. Disconnect air supply from gun.

4. Shutdown proportioning unit as required. See Proportioner manual.

5. Clean as required. See Clean Spray Gun Procedure, page 20.

6. Test spray on disposable surface.

Do not disassemble gun daily for cleaning if it is operating properly. However, if gun is removed from coupling block, it must be flushed and cleaned thoroughly.

18 311321M

Pressure Relief Procedure

4. Release gun trigger, set safety stop to

Relieve pressure before cleaning or repairing gun.

1. Close both manual valves.

Pressure Relief Procedure

CLOSED, and close manual valves.

If fluid in hose and proportioner is still under pressure, follow Pressure Relief Procedure in proportioner manual

To relieve pressure in hose after gun is removed, place fluid manifold over containers, facing away from you. Very carefully open fluid valves. Under high pressure, fluid will spray sideways from fluid ports. See FIG.

21.

Manual Valves

FIG. 19: Close Manual Valves

2. Set safety stop to OPEN.

3. Trigger gun onto cardboard or into waste container to relieve pressure.

FIG. 20: Trigger Gun

TI2484a

FIG. 21: Open Manual Valves

311321M 19

Maintenance

Use supplied tool kit 296835. See Tool Kit, page 48.

Gun Service Kits

Use either the 1-Quart Gun Service Kit (296980) or 3-Gallon Gun Service Kit (296981) to perform daily flushing of spray gun without disassembly.

FIG. 22: 1-Quart Gun Service Kit

For more information about the 1-Quart Gun Service Kit, see Manual 311340.

FIG. 23: 3-Gallon Gun Service Kit

For more information about the 3-Gallon Gun Service Kit, see Manual 311341.

Clean Spray Gun Procedure

To avoid static sparking that may result in fire or explosion, ensure all equipment in cleaning procedure is grounded. Do not clean on or near foamed or coated surfaces or any other flammable surfaces or objects.

Thoroughly flush gun block with gun cleaner before removing valving rod or mixing components from gun block. Also allow chemicals in spray gun to cool before cleaning.

This procedures makes use of the 1-Quart or 3-Gallon Gun Service Kit.

1. Set safety stop to CLOSED (SERVICE).

2. Close both manual valves.

20 311321M

Maintenance

3. Remove gun from coupling block.

4. Attach service block of gun service kit to spray gun, and then tighten using 5/16 in. nut driver.

5. Pressurize Service Kit container up to 100 psi. DO NOT EXCEED 100 psi (0.7 MPa, 7 bar).

6. Open one manual valve on service block.

7. Connect air to gun. Set safety stop to OPEN.

8. Hold gun against grounded waste container.

9. Trigger gun and 1-Quart Gun Service Kit. Spray into waste container until there is a fine, unobstructed mist of gun cleaner.

10.Release both triggers and close manual valve on service block.

11.Repeat steps 5-7 for other side of gun.

Flush Gun

To avoid static sparking that may result in fire or explosion, ensure all equipment in flushing procedure is grounded. Do not flush on or near foamed or coated surfaces.

1. Set safety stop to CLOSED (SERVICE).

2. Close both manual valves.

3. Loosen R-Screen screw and then remove by hand.

4. Use flush can to thoroughly flush screen screw and screen screw cavity.

5. Loosen A-Screen screw and then remove by hand.

6. Use flush can to thoroughly flush screen screw and screen screw cavity.

12.After initial cleaning, remove air cap, PCD retainer, and PCD. Flush a second time to ensure thorough cleaning.

13.Remove service block of gun service kit from spray gun.

14.Set safety to CLOSED (SERVICE).

15. Disconnect air supply.

16.Clean screens, check valves and screen screw as required. See Service Screen Screw, page 22.

Inspect air cap, PCD, mixing module, and gun block for build up of material and clean as required.

Do not use metal cleaning devices to clean plastic components.

7. Service gun by following Maintenance pro-

cedures, page 20.

311321M 21

Repair

Remove Centerline Components

Shutdown proportioner and allow chemicals to cool before servicing gun.

Clean A and R components in separate containers to avoid cross contamination.

Service Screen Screw

1. Flush gun according to Clean Spray Gun Procedure, page 20.

2. Unthread screen screw from gun block.

3. Remove check valve from screen screw. Clean valve with gun cleaner and inspect for damage. Replace if necessary.

4. Remove screen from screen screw. Soak in gun cleaner or replace if clogged or dirty.

5. Clean screen screw cavity. If any particles are visible, clean with clean out drills and flush with gun cleaner.

Refer to FIG. 4 through FIG. 6 for diagrams of centerline components for all gun models.

1. Flush gun according to Clean Spray Gun Procedure, page 20.

2. Connect air supply to gun. Set safety stop to OPEN.

3. Remove air cap.

4. Trigger gun and hold it to relieve pressure on PCD retainer.

5. Remove PCD retainer by turning it counterclockwise.

6. Remove PCD from mixing module retainer.

To remove PCD that is stuck, set safety stop to OPEN, depress and release gun trigger to unseat it. Set safety stop to CLOSED (SERVICE).

CAUTION

Any material left in cavity on downstream side of screen will clog mixing module.

6. Inspect screen screw seal for damage. Replace if necessary.

7. Reinstall screen screw in gun block. Make sure it is tight.

8. Flush gun with mixing module removed.

22 311321M

7. Remove mixing module retainer.

8. Set safety stop to OPEN. Depress and release gun trigger to unseat it. Remove mixing module off end of valving rod. Set safety stop to CLOSED (SERVICE).

CAUTION

Do not use sharp objects or metal tools to remove mixing module.

9. Loosen rear packing nut 1-2 turns.

10.Push safety stop partially forward, rotate it counterclockwise, and slide off air cylinder.

Repair

11.Remove valving rod.

Rod Draw Bar

Valving Rod

Rear Stop

FIG. 24: Remove Valving Rod (GX-7 DI model)

Valving Rod

Rear Stop

of mixed material from rod using cloth soaked in gun cleaner or fine steel wool.

If valving rod is replaced, it is recommended to reset forward stop.

13.Disconnect air supply.

14.Remove gun block retaining screw. Carefully slide gun block away from air cylinder. If dried chemical is built up on gun block, remove dried chemical before you remove gun block.

15.Clean all components thoroughly. Use brushes and clean-out tools to remove residual chemical from metal components. Use cotton swabs soaked in gun cleaner to clean plastic components.

16.Coat threads and mating surfaces of gun block and gun block bracket with Lubriplate grease, and reassemble.

. 25: Remove Valving Rod (GX-7A and

GX-7 400 models)

a. Depress trigger lever and hold.

GX-7 DI model only: loosen piston stop locknut until it disengages from thread on valving rod.

b. Use 5/16 in. nut driver to unthread valv-

ing rod from rear of gun.

c. When threads disengage remove

assembly by hand.

12.Inspect valving rod for damage and replace as required. Clean and remove any buildup

17.Inspect gun block for damage.

311321M 23

Repair

Install Centerline Components

GX-7 DI Model Only

Before installation, ensure all gun components are clean and dry. Lubricate all moving parts and threads.

1. Install rear packing gland with packing wrench. Tighten onto gun block.

2. Install rear packing retainer loosely.

3. Install valving rod. Use 5/16 in. nut driver to thread assembly tight into end cap. GX-7 DI model only: thread rod until approximately 3/16 in. to 1/4 in.of thread protrudes from end of piston rod.

4. Thread locknut onto valving rod by hand.

11.Install PCD over end of mixing module retainer.

12.Thread PCD retainer onto gun block. Hand tight.

13. Rotate flat PCD to adjust orientation as required.

14.Adjust valving rod. See Valving Rod Adjustment, page 16.

15.Thread air cap into place; hand tight.

16.Slide safety stop onto rear of air cylinder. Push safety stop partially forward and rotate clockwise to set to OPEN.

17.Set safety stop to CLOSED (SERVICE).

5. Carefully slide gun block onto valving rod toward air cylinder. Install gun block onto gun block mounting bracket.

6. Install safety stop; leave in OPEN position.

7. Connect air supply to gun.

8. Depress gun trigger and slide mixing module over end of valving rod. GX-7 DI model only: ensure valving rod alignment pin enters alignment slot in gun block. Keep gun trigger depressed.

9. With gun trigger depressed, thread mixing module retainer or PCD body with packing installed, by hand, and then wrench tighten.

CAUTION

To avoid damage to module and gun block, do not overtighten mixing module retainer.

10.Release gun trigger.

24 311321M

Repair

Replace End Cap and Air Piston Assembly

End Cap

Spacer

Piston Assembly

Rear

Front U-Cup Seal

FIG. 26: GX-7 DI End Cap and Air Piston Assembly

Piston Spring

Socket Head Cap Screw

Cylinder Clamp

GX-7 DI Shown

U-Cup Seal

ensure “cup” faces front of air cylinder when replacing.

10.By hand, pull piston assembly out of air cylinder and inspect o-ring for damage. Replace if necessary. Apply Lubriplate grease prior to installation.

11.If air was escaping around piston rod during operation, replace front u-cup seal or o-ring. Apply Lubriplate grease and ensure “cup” faces rear of air cylinder.

12.Insert piston and rod assembly into air cylinder. Take care to not damage front cup seal as rod passes through.

13.Insert piston spring. (For GX-7 DI models, also insert piston spacer.)

14.Reinstall end cap into air cylinder.

1. Clean gun according to Clean Spray Gun Procedure, page 20.

2. Loosen rear packing nut 1-2 turns.

3. Push safety stop partially forward, rotate counterclockwise, and slide safety stop off air cylinder.

4. Remove valving rod. See Remove Center- line Components, page 22.

5. Disconnect air supply from gun.

6. Remove rear head cap screw and cylinder clamp from handle.

7. Remove end cap from air cylinder.

8. Inspect end cap o-ring. Replace if damaged. Install new end cap o-ring after lightly coating it with Lubriplate grease.

15.Retighten rear socket head cap screw and cylinder clamp to handle.

16.Reinstall valving rod. Connect valving rod to draw bar. Lubricate and thread into end cap.

17.Adjust valving rod; see Valving Rod Adjustment, page 16.

18.Slide safety stop onto rear of air cylinder. Push safety stop partially forward and rotate clockwise to set to OPEN.

19.Set safety stop to CLOSED (SERVICE).

20.Tighten rear packing nut.

9. Inspect rear U-cup seal or o-ring for damage. Replace if necessary. If removed,

311321M 25

Repair

Replace Trigger Valve O-Rings

1. Clean gun according to Clean Spray Gun Procedure, page 20.

2. Disconnect air supply from gun.

Refer to Parts, page 30.

FIG. 27: Replace Trigger Valve O-Ring

8. Remove rear internal pipe plug (under pipe plug).

9. Use pin punch and hammer to gently tap spring seat until it and valve liner push out opposite end of hole.

10. Remove 4 o-rings on liner.

11.Apply thick coat of Lubriplate grease to new o-rings and install.

12.Clean valve hole. Remove any dirt and debris. Apply thick coat of Lubriplate grease to inside of valve hole.

13.Slide spring seat into gun handle air valve hole, tapered end first, until it bottoms out.

14.Push valve liner in as far as it will go. Temporarily screw in valve retainer nut, which aligns valve liner and valve spool. Remove valve retainer nut.

3. Remove mounting screw and locknut that hold trigger in place. Remove trigger.

4. Remove valve retainer nut.

5. Pull out valve spool and valve spring. Remove old o-rings.

6. Prior to installation, liberally lubricate all o-rings with lubricant provided in Rebuild kit.

Follow steps 7-15 to replace o-rings on valve liner. If o-rings do not need to be replaced, go to step 16.

7. Remove pipe plug from rear of gun handle.

For guns configured with air inlet at rear of gun handle, pipe nipple replaces pipe plug. Remove pipe nipple.

15. With valve spool spring in place, insert valve spool into valve liner. Screw in valve retainer nut. Do not overtighten.

16.Apply small amount of pipe thread sealant to 1/16 in. pipe plug threads. Screw pipe plug in place.

17.Apply small amount of pipe thread sealant to 1/8 in. pipe plug (or 1/8 in. pipe nipple) and install.

18.Reinstall trigger using screw and locknut.

26 311321M

Repair

Clean Mixing Module

1. Flush gun according to Clean Spray Gun Procedure, page 20.

2. Connect air supply to gun. Set safety stop to OPEN.

3. Remove air cap by hand.

GX-7A and GX-7 400 Models Only

Air cap and PCD retainer may be difficult to separate during disassembly due to overtightening or hardened mixed material. Fit the side of the stamped 5/8 in. wrench into the groove to separate. When reinstalling, apply lubricant to threads.

8. Set safety stop to OPEN. Depress and release gun trigger to unseat it. Remove mixing module from end of valving rod. Set safety stop to CLOSED (SERVICE).

9. Inspect valving rod for damage and replace as required. Use cloth soaked in gun cleaner or steel wool to clean and remove buildup of mixed material from rod.

If the valving rod is replaced, reset forward stop.

10. Clean mixing module.

Ensure cleanout tool size matches module size used. See the Set-Up Charts on pages 44 and 46.

a. Insert cleanout tool into pin vise.

FIG. 28: Unthread Cap from PCD Body

4. Trigger gun and hold it to relieve pressure on PCD retainer.

5. Remove PCD retainer by turning it counterclockwise.

6. Remove PCD from mixing module retainer.

To remove PCD that is stuck, set safety stop to OPEN, depress and release gun trigger to unseat it. Set safety stop to CLOSED (SERVICE).

b. Use cleanout tool to clean module

ports. Take care not to insert tool too far causing damage to inside bore of module. Use cotton swab soaked in gun cleaner to clean bore of module.

FIG. 29: Clean Module Ports

7. Remove mixing module retainer.

311321M 27

Repair

Install Mixing Module

1. Install safety stop; leave in OPEN position.

2. Connect air supply to gun.

3. Depress gun trigger and slide mixing module over end of valving rod. GX-7 DI model only: ensure valving rod alignment pin enters alignment slot in gun block. Keep gun trigger depressed.

4. With gun trigger depressed, thread mixing module retainer or PCD body with packing installed, by hand, and then wrench tighten.

CAUTION

To avoid damage to module and gun block, do not overtighten mixing module retainer.

11.Slide safety stop onto rear of air cylinder. Push safety stop partially forward and rotate clockwise to set to OPEN.

Module

PCD Body

PCD

Note orientation of

fan tip

Front Packing

Air Cap

Retainer O-Ring

PCD Retainer

FIG. 30: Install Mixing Module

5. Release gun trigger.

6. Install PCD over end of mixing module retainer.

7. Thread PCD retainer onto gun block. Hand tight.

8. Rotate flat PCD to adjust orientation as required.

9. Adjust valving rod. See Valving Rod Adjustment, page 16.

10. Thread air cap into place; hand tight.

28 311321M

Clean Pattern Control Disc

1. Set safety stop to CLOSED (SERVICE).

2. Close both manual valves.

3. Turn off air to air cap.

4. Use cotton swab soaked in gun cleaner to clean external surface of material build up. Light scrubbing with impinger cleanout brush may also be required.

a. Trigger gun to SERVICE position and

clean orifice area.

It is not always possible to clean all material build-up from PCD while assembled to gun. In this case, remove PCD and clean inside radius of disc.

Repair

Pattern Control

Disc (PCD)

GX-7A Model Shown

FIG. 31: Pattern Control Disc (PCD)

311321M 29

Parts

GX-7A Model Final Assembly

Part Numbers 295542, 295543, 295544, 295545

2, 26

30 311321M

GX-7A Model Final Assembly

Part Numbers 295542, 295543, 295544, 295545

Ref. No. Part No. Description Qty.

1 295810 Spray gun handle 1 2 15B772 Air hose 1 3 295596 Coupler plug 1 4 295597 Coupler 1 5 296834 R-gun block screen screw

assembly (includes 6, 7, 8, 9) 6 R-gun block screen screw 1 7 296693 Screen screw seal (pack of 2) -

296723 Screen screw seal (pack of 10) -

8 296792 Screen, 80 mesh (pack of 10) -

296724 Screen, 80 mesh (pack of 50) -

9 296722 Check valve assembly

(pack of 10) 10 295384 Gun block 1 11 Module; see GX-7A Mix Mod-

ule Kit, page 43 12 296976 PCD body 1 13 Tip; see Tip Kits, page 48 1 14 296978 Front packing (pack of 5) 1 15 295868 O-ring 1 16 296832 PCD retainer 1 17 296831 Air cap 1 18 296128 Coupling block gasket (pkg 2) 1 19 295433 Coupling block mounting screw 1

296979 Coupling block mounting screw

kit (pack of 2) 20 296833 A-gun block screen screw

assembly (includes 6, 8, 9, 21) 21 A-gun block screen screw 1 22 296828 Rear packing retainer 1 23 296829 Rear seal packing

(pack of 5) 24 296830 Rear seal retainer 1 25 16K136 Valving rod 1 26 100030 Fitting 1

Parts

311321M 31

Parts

GX-7 DI Model Final Assembly (295541)

2, 21

32 311321M

GX-7 DI Model Final Assembly (295541)

Ref. No. Part No. Description Qty.

1 295809 Spray gun handle assembly 1 2 15B772 Air hose, 1/4 in. x 23 in. (FXF) 1 3 295596 Coupler plug 1 4 295597 Coupler 1 5 295835 R-screen screw 1 6 296792 Screen, 80 mesh (pack of 10) -

296724 Screen, 80 mesh (pack of 50) -

7 296713 Check valve assembly

(pack of 2) 8 295860 Gun block 1 9 Module; see GX-7 DI Model

Specifications, page 47 10 295837 Module retainer 1 11 Tip; see Tip Kits, page 48 1 12 296865 Tip retainer 1 13 295838 Air cap 1 14 296128 Coupling block gasket

(pack of 2) 15 295433 Coupling block mounting screw 1

296979 Coupling block mounting screw

(pack of 2) 16 295834 A-screen screw 1 17 295836 Rear seal gland 1 18 296864 Rear seal retainer assembly 1 19 296829 Rear seal packing (pack of 5) 20 295383 Coupling block (not shown) 1 21 100030 Fitting 1

Parts

311321M 33

Parts

GX-7 400 Model Final Assembly (295540)

1, 24

34 311321M

GX-7 400 Model Final Assembly (295540)

Ref. No. Part No. Description Qty.

1 15B772 Air hose 1 2 296128 Coupling block gasket

(pack of 2) 3 295596 Coupler plug 1 4 295597 Coupler 1 5 295384 Gun block (includes 13) 1 6 296722 Check valve assembly

(pack of 10) 7 295799 Spray gun handle assembly 1 8 16K136 Valving rod 1 9 296792 Screen-80, mesh (pack of 10) -

296724 Screen-80, mesh (pack of 50) 10 A-Screen screw 1 11 R-Screen screw 1 12 296693 Screen screw seal (pack of 2) -

296723 Screen screw seal (pack of 10) 13 295433 Coupling block mounting screw 1

296979 Coupling block mounting screw

kit (pack of 2) 14 296828 Rear packing retainer 1 15 296829 Rear seal packing

(pack of 5) 16 296830 Rear seal retainer 1 18 Module; see GX-7 400 Mix

Module Kit, page 45 19 296836 Retainer 1 20 296837 Air cap 1 21 Tip; see Tip Kits, page 48 1 22 296833 A-gun block screen screw

assembly

(includes 6, 9, 10, 12) 23 296834 R-gun block screen screw

assembly

(includes 6, 9, 10, 12) 24 100030 Fitting 1

Parts

311321M 35

Parts

GX-7A Model Handle Assembly (24K734)

12 14

36 311321M

GX-7 Model Handle Assembly (24K734)

Ref. No. Part No. Description Qty.

1 296862 Spray gun handle 1 2 295678 Cylinder end cap assembly 1 3 295676 Spring 1 4 295675 Air cylinder 1 5 295709 Socket head cap screw,

8-32 x 3/4 in. 6 295680 Two position stop 1 7† 295681 O-ring 1 8◆ 16K136 Valving rod 1 9† 295683 O-ring 1 10 295663 Cylinder front stop 1 11† 514279 O-ring 1 12 295664 Air piston assembly 1 13 295665 Pipe nipple 1 14 295666 Stop clamp screw 1 15† 295667 Nylon pellet 1 16 295673 Gun block mount 1 17 295677 Air needle valve 1 18 295668 Spring 1 19 295669 Socket head cap screw,

1/4-28 x 5/8 20 295671 Trigger mounting screw 1 21 295688 Valve nut 1 23 295686 Spool valve liner 2 24 295689 Spring seat 1 26❄ 296971 Air valve spring 1 27†❄106555 O-ring, 6

Parts

† Parts included in Handle Seal Rebuild Kit

296895 (purchase separately).

❄ Parts included in Trigger valve rebuild kit

296897 (purchase separately).

◆ Valving rod 16K136 is shipped loose.

28†❄C20988 O-ring, fluoroelastomer 3 30 295438 Locknut, elastic stop nut,

5-40 32† 295405 Needle valve packing 1 33 295692 Spray gun trigger 1 34 295684 Socket head cap screw,

10-32 x 1/2 35 295687 Spool valve 1 36† 295674 Gasket 1 37† 295706 O-ring, Neoprene 1 38 295693 Pipe plug, flush seal, 1/6

NPT 39 295662 Pipe plug, flush seal, 1/8

NPT 40 103656 Hex nipple, 1/8 NPT

(optional) 41 295690 Cylinder clamp 1 42 C20003 Socket head cap screw,

10-32 x 1/2 43† 295685 O-ring 2

311321M 37

Parts

GX-7 DI Model Handle Assembly (295809)

38 311321M

GX-7 DI Model Handle Assembly (295809)

Parts

Ref. No. Part No. Description Qty.

1 296862 Gun handle 1 2 295714 Cylinder end cap assembly 1 3 295715 Air cylinder 1 4 295686 Valve liner 1 5 295687 Valve spool 1 6 295688 Valve retainer nut 1 7 295689 Spring seat 1 8 295690 Cylinder clamp 1 9 295716 Stop, stroke, long 1 10 295717 Two position stop body 1 11 295718 Stroke spacer 1 12 296736 Valving rod holder kit 1 13 295720 Piston spring 1 14 295712 Piston assembly 1 15 295721 Gun block mount 1 16 295713 Air needle valve 1 17 296863 Valving rod, 125 SS 1 18 295676 Spring 1 19† 295681 O-ring 1 20† 295683 O-ring 1 21 295665 Pipe nipple 1 22 295669 Socket head cap screw,

1/4-28 x 5/8 23 295671 Trigger mounting screw 1 24 295431 Locknut 1 25 295722 Flat head cap screw,

10-32 x 1/4 in. 26 295709 Socket head cap screw,

8-32 x 3/4 in. 27 295662 Pipe plug, flush seal, 1/8 in. 1 28❄ 106555 O-ring, fluoroelastomer 4 29† C20988 O-ring, fluoroelastomer 1 30†❄103337 O-ring, fluoroelastomer 3 31 295684 Socket head cap screw,

10-32 x 5/8 in. 32 295438 Stop nut, elastic 1 33† 295685 O-ring 2 34† 295496 U-cup 2 35 295692 Trigger 1 36 295693 Pipe plug, flush seal, 1/16

in. 37 C20003 Socket head cap screw,

10-32 x 1/2 38❄ 295442 Spring 1 39 103656 Hex nipple (optional), 1/8

MPT 40† 103338 O-ring, fluoroelastomer 1

† Parts included in Air Cylinder Rebuild Kit

296895 (purchase separately).

❄ Parts included in Trigger Valve Rebuild Kit

296897 (purchase separately).

311321M 39

Parts

GX-7 400 Model Handle Assembly (24K733)

125 PSI MAX

40 311321M

GX-7 400 Model Handle Assembly (24K733)

Ref. No. Part No. Description Qty.

1 106245 Cap screw, SCH 2 2 295662 Pipe plug 1 3†❄ 106555 Packing o-ring 6 4†❄ 103337 Packing o-ring 3 5 295684 Socket head cap screw 4 6 295438 Stop nut, elastic, 5-40 1 7†❄ 295685 O-ring 2 8† 295405 Needle valve, packing 1 9 295692 Spray gun trigger 1 10 295693 Pipe plug 1 11 C20003 Socket head cap screw 1 12❄ 295442 Spring 1 13 295695 Button head cap screw 1 14 295676 Spring 1 15 295771 Two-position stop 1 16† 295681 O-ring 1 17◆ 16K136 Valving rod 1 18† 295683 O-ring 1 19 295663 Front cylinder stop 1 20† 514279 O-ring 1 21 295664 Air piston 1 22 295665 Pipe nipple fitting 1 23 295666 Stop clamp screw 1 24† 295667 Pellet 1 25 295668 Spring 1 26 295669 Socket head cap screw,

modified 27 295671 Trigger mounting screw 1 28 295673 Gun block base 1 29† 295674 Gasket 1 30 295675 Air cylinder 1 31 295677 Air needle valve 1 32 295678 Cylinder end cap 1 33 295690 Cylinder clamp 1 34 295686 Valve liner 1 35 295687 Valve spool 1 36 295688 Retainer valve nut 1 37 295689 Spring seat 1 38 296862 Gun handle 1 39† 295706 O-ring 1 40 295708 Spacer 1

† Parts included in Air Cylinder Rebuild Kit

296895 (purchase separately).

Parts

❄ Parts included in Trigger Valve Rebuild Kit

296897(purchase separately).

◆

Valving rod 16K136 is shipped loose.

311321M 41

Parts

Coupling Block Assembly (295383)

All models

Ref. No. Part No. Description

1 295662 Pipe plug, flush seal, 1/8 in. 2 2 117634 R-swivel fitting 1 3 117635 A-swivel fitting 1 4 295693 Pipe plug, flush seal,

1/16 in. 5 296970 Manual valve assembly 2 6 296215 Coupling block 1

Qty

42 311321M

Specifications

GX-7A Mix Module Kit

Module Kit†❄ Module Only Cleanout Tool

Specifications

(A) Iso Port

Part No. Size Ref. Part No. Size Ref.

296909 #1 Round 296907 #1 Round 246807 .0320 (.81) 246807 .032 (.81)

296916 #2 Round 296225 #2 Round 246816 .018 (.45) 246816 .018 (.45)

296919 #3 Round 296226 #3 Round 276984 .0225 (.57) 246816 .018 (.45)

296921 #4 Round n/a #4 Round 296290 .035 (.89) 246807 .032 (.81)

296923 #5 Round 296228 #5 Round 276984 .0225 (.57) 248892 .028 (.71)

296925 #7 Flat 296230 #7 Flat 248892 .028 (.71) 248892 .028 (.71)

296906 #10 Flat 296233 #10 Flat 296291 .036 (.91) 296291 .036 (.91)

296910 #12 Flat 296130 #12 Flat 296286 .021 (.53) 296286 .021 (.53)

296915 #16 Round n/a #16 Round 248892 .028 (.71) 248892 .028 (.71)

296917 #22 Round n/a #22 Round 276984 .0225 (.57) 276984 .0225 (.57)

296875 A2 Pour n/a A2 Pour 246816 .018 (.45) 246816 .018 (.45)

296876 A3 Pour n/a A3 Pour 248640 .039 (.99) 248640 .039 (.99)

296868 A5 Pour n/a A5 Pour 246807 .032 (.81) 246807 .032 (.81)

296870 A5-FS Pour n/a A5-FS Pour 246807 .032 (.81) 246807 .032 (.81)

Each module has a specially sized cleanout tool. To avoid damage to module, use correct cleanout tool.

Part No.

† Module Kits include one mix module and both cleanout tools. See following table.

❄ Some Module Kits also available in packs. See following table.

Diameter

in/(mm)

(R) Resin Port

Part No.

Diameter

in/(mm)

Mix Module Kit

Part No. Size Ref. Qty./Pack

296908 #1 Round 12 (with 2 drills)

296869 A5 Pour 12

296871 A5-FS Pour 12

296872 A10 Pour 12

296873 A20 Pour 12

296874 A2 Pour 12 (with 2 drills)

296911 STD Blank 5

296912 STD Blank 100

296913 PEEK Blank 5

311321M 43

Specifications

Set-Up Chart for GX-7A Model

Pres-

sure (psi)

1000 22 ❄22 296909 (#1) .0320 4 .0320 4 296712

1000 12 ❄12 296919 (#3) .0180 4 .0225 4 296710

1600 16 ❄14 296923 (#5) .0280 4 .0225 4 296710

2000 30 ❄24 296909 (#1) .0320 4 .0320 4 296694

3000 40 ❄24 296921 (#4) .0320 4 .0350 4 296695

600 3.5 N/A 296875 (A2) .0180 1 .0180 1 296697

600 12 N/A 296876 (A3) .0390 1 .0390 1 296697

1000 12 ❖ 16 x 4 296925 (#7) .0280 2 .0280 2

1500 24 ❖ 22 x 4 296906

1500 5 ❖ 16 x 3 296910

Output

(lbs/min)

Pattern

Dia.

(inches)

Module Part

No.

Round Spray Pattern

Fan Spray Pattern

(#10)

(#12)

Polyol

Port Size

Pour Pattern

.0360 2 .0360 2 296703

.0210 2 .0210 2

No.

Orifices

Iso Port

Size

No.

Orifices Tip

296704

296705

❄

At 24 in. above substrate

❖

At 18 in. above substrate

44 311321M

GX-7 400 Mix Module Kit

Module Kits Cleanout Drill

Specifications

Iso Port

Part No. Size Ref. Quantity

296885 296884

296859 296860

296888 296887

296891 296890

402 Round 1

451 Fan 1

452 Fan 1

453 Fan 1

CAUTION

Part No.

Each module kit includes cleanout drills. To avoid damage to module, use correct cleanout drill.

Module Only

Diameter

in/(mm)

246816 .018 (.45) 246816 .018 (.45)

246631 .020 (.51) 246631 .020 (.51)

296287 .025 (.64) 276984 .0225 (.57)

Polyol Port

Part No.

Diameter

in/(mm)

Part No. Size Ref.

296316 451 Fan

295379 453 Fan

311321M 45

Specifications

Set-up Chart for GX-7 400 Model

Pres-

sure (psi)

1500 3.5 ✖ 8 296885 (402) .0180 1 .0180 1 296858

1500 3.5 ❖ 16 x 3 296859 (451) .0180 1 .0180 1 296853

Output

(lbs/min)

Pattern

Dia.

(inches)

Module Part

No.

Round Spray Pattern

Fan Spray Pattern

Polyol

Port Size

No.

Orifices

Iso Port

Size

No.

Orifices Tip

1500 4.5 ❖ 16 x 3 296888 (452) .0200 1 .0200 1 296853

1500 8.0 ❖ 16 x 3 296891 (453) .0225 2 .0250 2 296855

✖

At 24 in. above substrate

❖

At 18 in. above substrate

Tip Kits (for GX-7 400 Gun)

Part No. No. Ref. Quantity

296858 40 Round 1

296852 210 Fan 1

296853 212 Fan 1

296854 212 Fan 5

296855 213 Fan 1

296856 213 Fan 5

296857 214 Fan 1

296892 TOM 1

46 311321M

GX-7 DI Model Specifications

Module/Tip Data for Chemical Sprayed at 2500 PSI

✖ Module Kit Cleanout Drill Ref. No. ❄Pattern

Fan Spray Pattern

Specifications

❄Output

(lbs/min)

296900 (#2) 246625

(.086 diameter)

296901 (#4) 248892

(.028 diameter)

296903 (#5) 246816

(.018 diameter)

Round Spray Pattern

296903 (#5) 246816

(.018 diameter)

212 12 in. wide 12

206 20 in. wide 22

213 12 in. wide 12

204 20 in. wide 21

212 10 in. wide 8

206 24 in. wide 11

204 18 in. wide 10

212 11 in. wide 4

213 12 in. wide 4

208 8 in. wide 4

40 4 in. diameter 8

55 7 in. diameter 9.5

70 8 in. diameter 9.75

90 10 in. diameter 9.75

❄ Actual results may vary due to chemical system characteristics, temperature, pressure, and ratio.

✖ Includes appropriate cleanout drills.

Mix Module Kit

Part No. Size Ref. Quantity

296898 PEEK 018/018 1

296899

Module Only

Part No. Size Ref.

296902 #5

311321M 47

PEEK 028/028 1

Specifications

Tip Kits

For GX-7A and GX-7 DI Models

Round Tip Kits

Part No. Size Qty.

296708 40 1

296709

296717

296710

296718 70 5

296711

296719

296712 90 1

296720

296694

296714

296695

296696

296697

46 1

55 5

70 1

80 1

80 5

90 5

100 1

100 5

110 1

110 5

125 1

Flat Tip Kits

Part No. No. Ref. Qty.

296698 202 1

296699

296700

296701

203 1

204 1

206 1

296702 208 1

296703

296704

209 1

210 1

296715 210 5

296882

296705

296716

296706

296883

296707

212.5

SPEC

212 1

212 5

213 1

213-

SPEC

215 1

296877

140 1

Tool Kit

296835 GX-7A, GX-7 DI, and GX-7 400 models:

Part Description

117642 5/16 in. Hex Nut Driver

117661 Pine Vise (dual reversible chucks)

296199 1/2 in. Combination Wrench

296188 5/8 in. Combination Wrench

295899 5/16 x 3/8 in. Open End Wrench

127748 Adjustable Wrench

296191 Gasket Removal Tool

296192 Air Valve Tool

295898 Cleanout Brush

Part Description

--- 3/32 in, 9/64 in, 5/32 in. and 3/16 in. Allen Wrenches

--- #58 and #60 Mix Module Cleanout Drills (see Mix Module Specifications)

--- 5/32 in., 1/8 in., and 6/64 in. Cleanout Drills (use varies depending on model)

48 311321M

Technical Data

Category Data

Air Supply 100-125 psi (0.7-0.9 MPa, 6.9-8.6 bar) Maximum Operating Pressure 3500 psi (24 MPa, 240 bar) Maximum Output

Minimum Output

Height 9 in. (23 cm) Length 9.5 in. (24 cm) Width 4.5 in. (11 cm) Weight 3.5 lbs. (1.5 kg) Mixing GX-7A Model:

❄

GX-7A Model:

40 lbs/min (18 kg/min)

GX-7 DI Model:

22 lbs/min (10 kg/min)

GX-7 400 Model:

8 lbs/min (3.6 kg/min)

GX-7A Model:

4 lbs/min (1.8 kg/min)

GX-7 DI Model:

4 lbs/min (1.8 kg/min)

GX-7 400 Model:

3.5 lbs/min (1.6 kg/min)

Internal impingement, airless atomization, solvent-free, mechanically self cleaning

GX-7 DI Model:

Internal direct impingement, airless atomization, solvent-free, mechanically self cleaning

GX-7 400 Model:

Internal direct impingement, airless atomization, solvent-free, mechanically self cleaning

Technical Data

❄ Theoretical: actual results will vary with operating conditions

311321M 49

Graco Standard Warranty

Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in material and workmanship on the date of sale to the original purchaser for use. With the exception of any special, extended, or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be defective. This warranty applies only when the equipment is installed, operated and maintained in accordance with Graco’s written recommendations.

This warranty does not cover, and Graco shall not be liable for general wear and tear, or any malfunction, damage or wear caused by faulty installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or substitution of non-Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of Graco equipment with structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture, installation, operation or maintenance of structures, accessories, equipment or materials not supplied by Graco.

This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for verification of the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The equipment will be returned to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect in material or workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor, and transportation.

THIS WARRANTY IS EXCLUSIVE, AND IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.

Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other remedy (including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any other incidental or consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the date of sale.

GRACO MAKES NO WARRANTY, AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IN CONNECTION WITH ACCESSORIES, EQUIPMENT, MATERIALS OR COMPONENTS SOLD BUT NOT MANUFACTURED BY GRACO. These items sold, but not manufactured by Graco (such as electric motors,

switches, hose, etc.), are subject to the warranty, if any, of their manufacturer. Graco will provide purchaser with reasonable assistance in making any claim for breach of these warranties.

In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment hereunder, or the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract, breach of warranty, the negligence of Graco, or otherwise.

FOR GRACO CANADA CUSTOMERS

The Parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnaissent avoir convenu que la rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires exécutés, donnés ou intentés, à la suite de ou en rapport, directement ou indirectement, avec les procédures concernées.

Graco Information

For the latest information about Graco products, visit www.graco.com.

TO PLACE AN ORDER, contact your Graco distributor or call to identify the nearest distributor. Phone: 612-623-6921 or Toll Free: 1-800-328-0211 Fax: 612-378-3505

All written and visual data contained in this document reflects the latest product information available at the time of publication.

GRACO INC. AND SUBSIDIARIES • P.O. BOX 1441 • MINNEAPOLIS MN 55440-1441 • USA

Graco reserves the right to make changes at any time without notice.

Original instructions.

International Offices: Belgium, China, Japan, Korea

This manual contains English. MM 311321

Graco Headquarters: Minneapolis

www.graco.com

Revision M, June 2014

Graco 311321M User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Models

Warnings

Overall View

Centerline Components

Mixing Module

Operation Basics

Isocyanate Hazard

Grounding

Safety Position

Keep A and B Components Separate

Air Hose Connection

Coupling Block

Air Inlet Configuration

Mixing Module and PCD Installation

Valving Rod Adjustment

Valving Rod Adjustment

Initial Set Up

Daily Start-up

Daily Shutdown

Pressure Relief Procedure

Maintenance

Gun Service Kits

Clean Spray Gun Procedure

Flush Gun

Repair

Remove Centerline Components

Service Screen Screw

Install Centerline Components

Replace End Cap and Air Piston Assembly

Replace Trigger Valve O-Rings

Clean Mixing Module

Install Mixing Module

Clean Pattern Control Disc

Parts

GX-7A Model Final Assembly

GX-7 DI Model Final Assembly (295541)

GX-7 400 Model Final Assembly (295540)

GX-7A Model Handle Assembly (24K734)

GX-7 DI Model Handle Assembly (295809)

GX-7 400 Model Handle Assembly (24K733)

Coupling Block Assembly (295383)

Specifications

GX-7A Mix Module Kit

Set-Up Chart for GX-7A Model

GX-7 400 Mix Module Kit

Set-up Chart for GX-7 400 Model

GX-7 DI Model Specifications

Tip Kits

Tool Kit

Technical Data

Graco Standard Warranty

Graco Information