Graco GX-7A, GX-7 DI, GX-7 400 Instruction Manual

Instructions

GX-7A™, GX-7® DI, and GX-7 400 Spray Guns

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

See page 3 for model information.

3500 psi (24 MPa, 240 bar) Maximum Fluid Working Pressure 125 psi (0.86 MPa, 8.6 bar) Maximum Air Working Pressure

Important Safety Instructions

Read all warnings and instructions in this manual before using the equipment. Save these instructions.

311321V

Important Medical Information

Read the medical alert card provided with the gun. It contains injection injury treatment information for a doctor. Keep it with you when operating the equipment.

GX-7A

GX-7 400

GX-7A DI

Related Manuals

Contents

Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Important Isocyanate (ISO) Information . . . . . . . . . 6

Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . 6

Material Self-Ignition . . . . . . . . . . . . . . . . . . . . . . 7

Keep Components A and B Separate . . . . . . . . . 7

Moisture Sensitivity of Isocyanates . . . . . . . . . . . 7

Foam Resins with 245 fa Blowing Agents . . . . . . 7

Changing Materials . . . . . . . . . . . . . . . . . . . . . . . 7

Component Identification . . . . . . . . . . . . . . . . . . . . 8

Model GX-7A . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Model GX-7 DI . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Model GX-7 400. . . . . . . . . . . . . . . . . . . . . . . . . 10

Centerline Components . . . . . . . . . . . . . . . . . . . 11

Mixing Module . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Air Hose Connection . . . . . . . . . . . . . . . . . . . . . 15

Safety Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Manual Valves . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Coupling Block . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Pressure Relief Procedure. . . . . . . . . . . . . . . . . 17

Flush Gun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Initial Set Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Daily Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 20

Optional Configuration . . . . . . . . . . . . . . . . . . . . . 21

Air Inlet Configuration . . . . . . . . . . . . . . . . . . . . 21

Install Mixing Module . . . . . . . . . . . . . . . . . . . . . 21

Install PCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Check Adjustment of Valving Rod . . . . . . . . . . . 22

Adjust Valving Rod. . . . . . . . . . . . . . . . . . . . . . . 23

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Gun Service Kits. . . . . . . . . . . . . . . . . . . . . . . . . 24

Clean Spray Gun . . . . . . . . . . . . . . . . . . . . . . . . 24

Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Service Screen Screw . . . . . . . . . . . . . . . . . . . . 26

Remove and Service Centerline Components . . 26

Install Centerline Components . . . . . . . . . . . . . . 28

Replace End Cap and Air Piston Assembly . . . . 29

Replace Trigger Valve O-Rings . . . . . . . . . . . . . 30

Clean Mixing Module . . . . . . . . . . . . . . . . . . . . . 31

Install Mixing Module . . . . . . . . . . . . . . . . . . . . . 32

Clean Pattern Control Disc . . . . . . . . . . . . . . . . . 32

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

GX-7A Assembly . . . . . . . . . . . . . . . . . . . . . . . . 34

GX-7 DI Assembly (295541). . . . . . . . . . . . . . . . 36

GX-7 400 Assembly (295540) . . . . . . . . . . . . . . 38

GX-7A Handle (24K734). . . . . . . . . . . . . . . . . . . 40

GX-7 DI Handle (295809). . . . . . . . . . . . . . . . . . 42

GX-7 400 Handle (24K733) . . . . . . . . . . . . . . . . 44

Coupling Block Assembly (295383) . . . . . . . . . . 46

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

GX-7A Mix Module Kit . . . . . . . . . . . . . . . . . . . . 47

Set-Up Chart for GX-7A Model. . . . . . . . . . . . . . 48

GX-7 400 Mix Module Kit . . . . . . . . . . . . . . . . . . 49

Set-up Chart for GX-7 400 Model. . . . . . . . . . . . 50

GX-7 DI Model Specifications. . . . . . . . . . . . . . . 51

Tip Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Tool Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Technical Specifications . . . . . . . . . . . . . . . . . . . . 53

California Proposition 65 . . . . . . . . . . . . . . . . . . . . 53

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 54

Related Manuals

Manuals are available at www.graco.com

Manual in English

311340

311341 Gusmer Directional Valve Kit

2 311321V

Description

Gusmer® Gun Service Kits

Models

Part Description

295540 GX-7 400 296859 (451) 296853 (212)

295541 GX-7 DI - 4/213 296901 (4) 296706 (213)

295542 GX-7A - 1/90 296909 (1) 296712 (90)

295543 GX-7A - 10/210 296906 (10) 296704 (210)

295544 GX-7A - 3/70 296226 (3) 296710 (70)

295545 GX-7A - 5/70 296923 (5) 296710 (70)

25E217 GX-7A - A3 Slabjacking 296876 (A3) Not included

25F046 GX-7A-A3 Slabjacking OEM 296566 (A3) Not Included

Mix Module Tip

Includes:

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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 or on warning labels, 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

TOXIC FLUID OR FUMES HAZARD

Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled or swallowed.

• Read Safety Data Sheets (SDSs) for handling instructions and to know the specific hazards of the fluids you are using, including the effects of long-term exposure.

• When spraying, servicing equipment, or when in the work area, always keep work area well-ventilated and always wear appropriate personal protective equipment. See Personal Protective Equipment warnings in this manual.

• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.

PERSONAL PROTECTIVE EQUIPMENT

Always wear appropriate personal protective equipment and cover all skin when spraying, servicing equipment, or when in the work area. Protective equipment helps prevent serious injury, including long-term exposure; inhalation of toxic fumes, mists or vapors; allergic reaction; burns; eye injury and hearing loss. This protective equipment includes but is not limited to:

• A properly fitting respirator, which may include a supplied-air respirator, chemically impermeable gloves, protective clothing and foot coverings as recommended by the fluid manufacturer and local regulatory authority.

• Protective eyewear and hearing protection.

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.

• Engage safety lock when not spraying.

• 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.

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

• Tighten all fluid connections before operating the equipment.

• Check hoses and couplings daily. Replace worn or damaged parts immediately.

4 311321V

Warnings

WARNING

FIRE AND EXPLOSION HAZARD

Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. Paint or solvent flowing through the equipment can cause static sparking. 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 sparking).

• Ground all equipment in the work area. See Grounding instructions.

• Never spray or flush solvent at high pressure.

• 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.

• Use only grounded hoses.

• Hold gun firmly to side of grounded pail when triggering into pail. Do not use pail liners unless they are anti-static or conductive.

• Stop operation immediately if static sparking occurs or you feel a shock. 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 Specifications in all equipment manuals.

• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Specifications in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information about your material, request Safety Data Sheets (SDSs) from distributor or retailer.

• Turn off all equipment and follow the Pressure Relief Procedure when equipment is not in use.

• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manufacturer’s replacement parts only.

• Do not alter or modify equipment. Alterations or modifications may void agency approvals and create safety hazards.

• Make sure all equipment is rated and approved for the environment in which you are using it.

• Use equipment only for its intended purpose. Call your 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.

BURN HAZARD

Equipment surfaces and fluid that is heated can become very hot during operation. To avoid severe burns:

• Do not touch hot fluid or equipment.

PRESSURIZED ALUMINUM PARTS HAZARD

Use of fluids that are incompatible with aluminum in pressurized equipment can cause serious chemical reaction and equipment rupture. Failure to follow this warning can result in death, serious injury, or property damage.

• Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or fluids containing such solvents.

• Do not use chlorine bleach.

• Many other fluids may contain chemicals that can react with aluminum. Contact your material supplier for compatibility.

311321V 5

Important Isocyanate (ISO) Information

Isocyanates (ISO) are catalysts used in two component materials.

Isocyanate Conditions

Spraying or dispensing fluids that contain isocyanates creates potentially harmful mists, vapors, and atomized particulates.

• Read and understand the fluid manufacturer’s warnings and Safety Data Sheets (SDSs) to know specific hazards and precautions related to isocyanates.

• Use of isocyanates involves potentially hazardous procedures. Do not spray with this equipment unless you are trained, qualified, and have read and understood the information in this manual and in the fluid manufacturer’s application instructions and SDSs.

• Use of incorrectly maintained or mis-adjusted equipment may result in improperly cured material, which could cause off gassing and offensive odors. Equipment must be carefully maintained and adjusted according to instructions in the manual.

• To prevent inhalation of isocyanate mists, vapors and atomized particulates, everyone in the work area must wear appropriate respiratory protection. Always wear a properly fitting respirator, which may include a supplied-air respirator. Ventilate the work area according to instructions in the fluid manufacturer’s SDSs.

• Avoid all skin contact with isocyanates. Everyone in the work area must wear chemically impermeable gloves, protective clothing and foot coverings as recommended by the fluid manufacturer and local regulatory authority. Follow all fluid manufacturer recommendations, including those regarding handling of contaminated clothing. After spraying, wash hands and face before eating or drinking.

• Hazard from exposure to isocyanates continues after spraying. Anyone without appropriate personal protective equipment must stay out of the work area during application and after application for the time period specified by the fluid manufacturer. Generally this time period is at least 24 hours.

• Warn others who may enter work area of hazard from exposure to isocyanates. Follow the recommendations of the fluid manufacturer and local regulatory authority. Posting a placard such as the following outside the work area is recommended:

TOXIC FUMES

HAZARD

DO NOT ENTER DURING

SPRAY FOAM APPLICATION OR FOR ___ HOURS AFTER

APPLICATION IS COMPLETE

DO NOT ENTER UNTIL:

DATE: TIME:

6 311321V

____________ ____________

Important Isocyanate (ISO) Information

Material Self-Ignition

Some materials may become self-igniting if applied too thick. Read material manufacturer’s warnings and Safety Data Sheets (SDSs).

Keep Components A and B Separate

Cross-contamination can result in cured material in fluid lines which could cause serious injury or damage equipment. To prevent cross-contamination:

• Never interchange component A and component

B wetted parts.

• Never use solvent on one side if it has been contaminated from the other side.

NOTICE

Partially cured ISO will reduce performance and the life of all wetted parts.

• Always use a sealed container with a desiccant

dryer in the vent, or a nitrogen atmosphere. Never store ISO in an open container.

• Keep the ISO pump wet cup or reservoir (if installed) filled with appropriate lubricant. The lubricant creates a barrier between the ISO and the atmosphere.

• Use only moisture-proof hoses compatible with ISO.

• Never use reclaimed solvents, which may contain moisture. Always keep solvent containers closed when not in use.

• Always lubricate threaded parts with an appropriate lubricant when reassembling.

NOTE: The amount of film formation and rate of crystallization varies depending on the blend of ISO, the humidity, and the temperature.

Moisture Sensitivity of Isocyanates

Exposure to moisture (such as humidity) will cause ISO to partially cure, forming small, hard, abrasive crystal that become suspended in the fluid. Eventually a film will form on the surface and the ISO will begin to gel, increasing in viscosity.

Foam Resins with 245 fa Blowing Agents

Some foam blowing agents will froth at temperatures above 90°F (33°C) when not under pressure, especially if agitated. To reduce frothing, minimize preheating in a circulation system.

Changing Materials

NOTICE

Changing the material types used in your equipment requires special attention to avoid equipment damage and downtime.

• When changing materials, flush the equipment multiple times to ensure it is thoroughly clean.

• Always clean the fluid inlet strainers after flushing.

• Check with your material manufacturer for chemical compatibility.

• When changing between epoxies and urethanes or polyureas, disassemble and clean all fluid components and change hoses. Epoxies often have amines on the B (hardener) side. Polyureas often have amines on the B (resin) side.

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Component Identification

2 !

Component Identification

Model GX-7A

FIG. 1

Key

A Forward Stop Locknut B Gun Block C Manual Valve D Trigger

Key

E Rear Packing Nut F Valving Rod Forward Stop G Air Cap Adjustment Valve H Safety Lock

8 311321V

Model GX-7 DI

Component Identification

FIG. 2

Key

B Gun Block C Manual Valve D Trigger G Air Cap Adjustment Valve H Safety Lock

Key

J Coupling Block K Piston Rod M Air Cap N Valving Rod P Lock Nut

311321V 9

Component Identification

Model GX-7 400

FIG. 3

Key

A Forward Stop Locknut B Gun Block D Trigger E Rear Packing Nut

Key

F Valving Rod Forward Stop G Air Cap Adjustment Valve H Safety Lock

10 311321V

Centerline Components

Model GX-7A

Component Identification

FIG. 4

ZAA

ZAH

ZAB

ZAC

ZAJ

ZAE

ZAG

ZAD

Key

B Gun Block N Valving Rod M Air Cap S Rear Packing T Rear Seal Retainer U Rear Packing Retainer V Screen W Screen Screw Seal Y R-Screen Screw

Key

Z Check Valve ZAA Coupling Block Gasket ZAB Front Packing ZAC Pattern Control Disc (PCD) ZAD PCD Retainer ZAE PCD Body ZAG O-ring ZAH Mixing Module ZAJ A-Screen Screw

311321V 11

Component Identification

Model GX-7 DI

FIG. 5

ZAD

ZAM

ZAH

ZAC

ZAN

ZAA

ZAR

ZAP

ZAJ

Key

B Gun Block M Air Cap S Rear Packing V Screen Z Check Valve ZAA Coupling Block Gasket ZAC Pattern Control Disc (PCD)

Key

ZAD PCD Retainer ZAJ A-Screen Screw ZAH Mixing Module ZAM Mixing Module Retainer ZAN Rear Seal Gland ZAP Rear Seal Retainer Assembly ZAR Coupling Block Mounting Screw

12 311321V

Model GX-7 400

Component Identification

ZAD

ZAF

ZAH

ZAC

ZAS

ZAR

ZAA

ZAJ

FIG. 6

Key

B Gun Block M Air Cap N Valving Rod S Rear Packing T Rear Seal Retainer U Rear Packing Retainer V Screen W Screen Screw Seal Y R-Screen Screw

Key

Z Check Valve ZAA Coupling Block Gasket ZAC Pattern Control Disc (PCD) ZAD PCD Retainer ZAH Mixing Module ZAJ A-Screen Screw ZAR Coupling Block Mounting Screw ZAS Spring

311321V 13

Component Identification

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.

The gun can be assembled with either a round or flat mixing module, depending on the type of system used to spray. The Set-Up Charts on pages 48 and 50 show several of the more common sets of these configurations.

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

GX-7A

ZAC (round or flat)

ZAH

(round or flat)

GX-7A 400

ZAH (round or flat)

ZAC (round or flat)

ZAH (round or flat)

ZAC (round or flat)

FIG. 7 Mixing Modules

GX-7 DI

14 311321V

Operation

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

Grounding

The equipment must be grounded to reduce the risk of static sparking. Static sparking can cause fumes to ignite or explode. Grounding provides an escape wire for the electric current.

Follow local codes, regulations, and your proportioner manual for detailed grounding instructions.

Operation

Safety Lock

High-pressure fluid from dispensing devices can pierce skin. To help prevent serious injury from pressurized fluid, always engage the piston safety lock and close the material shutoff valves to avoid accidental triggering whenever you stop spraying.

The CLOSED (SERVICE) position will not allow the gun to discharge. The OPEN position allows the gun to dispense. Whenever the gun is not spraying, set to CLOSED (SERVICE) position.

To engage safety lock: push in and turn the safety lock clockwise to place the gun in CLOSED (SERVICE) position.

Spray gun: ground the spray gun through connection to a properly grounded fluid hose and pump.

Air Hose Connection

To connect air hoses: pull back the sleeve of the

female fitting, insert the male fitting and slide the sleeve forward to secure connection.

To disconnect air hoses: pull back the sleeve of the female fitting and pull out the male fitting.

Pull Sleeve

CLOSED (SERVICE)

Put in safety position when not spraying.

FIG. 9: Safety Lock - Closed

To disengage safety lock: push in and turn the safety

lock counterclockwise to place the gun in OPEN position (red band is exposed).

Red Band

FIG. 8

FIG. 10: Safety Lock - Open

311321V 15

OPEN

Red band exposed to spray.

Operation

Manual Valves

NOTE: Triggering the gun with the manual valves (C)

closed may cause crossover if the gun ports contain residual chemical.

Closing the manual valves (C) prevents chemicals in heated hoses from entering the gun. Close the manual valves before servicing gun.

Never open manual valves (C) unless coupling block (J) is secured to gun or exit port is directed into flush pail.

To open the manual valves (C): Use a 5/16 in. nut driver to turn the manual valve counterclockwise three full turns. Do not open until it bottoms out.

To close the manual valves (C): turn the manual valves clockwise until tight.

Coupling Block

Chemical hoses are joined to the gun block (B) by the coupling block (J) to ease installation and removal of the gun.

ZAA

FIG. 12 Coupling Block

Install Coupling Block

1. Inspect the coupling block (J) gaskets for damage and wear. Replace if necessary.

ZAR

FIG. 11 Manual Valves

2. With gaskets in place, fit the coupling block (J) to the gun block (B).

3. Insert the coupling block (J) mounting screw and tighten securely with a 5/16 in. nut driver.

Remove Coupling Block

To prevent release of pressurized chemical, close both manual valves (C) before removing coupling block (J).

1. Set the safety lock (H) to CLOSED (SERVICE).

2. Disconnect the air hose.

3. Close both manual valves (C).

4. Remove the coupling block (J) mounting screw.

5. Separate the coupling block (J) from the gun.

6. Wipe the mating surfaces of the gun block (B) and coupling block (J) to remove residual chemical.

7. Cover exposed openings with grease.

16 311321V

Operation

Pressure Relief Procedure

Follow the Pressure Relief Procedure whenever you see this symbol.

This equipment stays pressurized until pressure is manually relieved. To help prevent serious injury from pressurized fluid, such as skin injection or splashing fluid, follow the Pressure Relief Procedure when you stop spraying and before cleaning, checking, or servicing the equipment.

1. Close both manual valves (C).

ti39022a

4. Set the safety lock (H) to CLOSED (SERVICE).

CLOSED (SERVICE)

ti39025a

5. Disconnect the gun air supply.

ti39026a

NOTE: If the gun is removed from the coupling block (J), follow Clean Spray Gun, page 24.

NOTE: After the pressure in the spray gun is relieved, the fluid in the hose and proportioner remains under pressure. Follow the Pressure Relief Procedure in your proportioner manual to relieve pressure in the system.

2. Set the safety lock (H) to OPEN.

Red Band

ti39023a

OPEN

Red band exposed to spray.

3. Trigger the gun once onto waste area to relieve fluid pressure in front end of the gun.

ti39024a

311321V 17

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