Graco 311320H D Spray Gun Users Manual Gun, Operation, Parts, Service, And Repair, English

2015-04-02

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311320H

Operation, Parts, Service and Repair

Model D Spray Gun

For use with non-flammable polyurethane foams. For professional use only.

Not for use in explosive atmospheres.

See page 2 for model information.

1000 psi (7 MPa, 70 bar) Maximum Working Pressure

Important Safety Instructions

Read all warnings and instructions

in this manual. Save these instructions.

Models

2311320H

Contents

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

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

Overall View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Major Components . . . . . . . . . . . . . . . . . . . . . . . 5

Centerline Components . . . . . . . . . . . . . . . . . . . 6

Operation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Isocyanate Hazard . . . . . . . . . . . . . . . . . . . . . . . 7

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

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Coupling Block . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Air Hose Connection . . . . . . . . . . . . . . . . . . . . . . 9

Valving Rod Adjustment Screw . . . . . . . . . . . . . . 9

Air Cap Adjustment Valve . . . . . . . . . . . . . . . . . 10

Felt Wiper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Initial Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Daily Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Pressure Relief Procedure . . . . . . . . . . . . . . . . . . 13

Spray Pattern Adjustment . . . . . . . . . . . . . . . . . . . 14

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Gun Service Kits . . . . . . . . . . . . . . . . . . . . . . . . 17

Clean Spray Gun Procedure . . . . . . . . . . . . . . . 18

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Filter Screen Removal and Service . . . . . . . . . . 19

Clean Injection Slots . . . . . . . . . . . . . . . . . . . . . 20

Valving Rod Adjustment . . . . . . . . . . . . . . . . . . 21

Centerline Component Removal . . . . . . . . . . . . 22

Centerline Component Installation . . . . . . . . . . 24

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Model D Spray Gun Assembly . . . . . . . . . . . . . . 26

Air Cylinder Assembly . . . . . . . . . . . . . . . . . . . . 30

Coupling Block Assembly . . . . . . . . . . . . . . . . . 31

Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 34

Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 34

Models

Part No. Description Mix Module

295530 D-55 296597

295531 D-55-RECIRC 296597

295532 D-62 296598

295533 D-70 296599

Warnings

311320H 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.

•Follow Pressure Relief Procedure in this manual, when you stop spraying and before

cleaning, checking, or servicing equipment.

Warnings

4311320H

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 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 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.

WARNING

Overall View

311320H 5

Overall View

Major Components

FIG. 1: Major Components

Spring Retainer Case

Valving Rod Closure Spring

Valving Rod Positioner Valving Rod

Adjustment Screw

Valving Rod Stop Bar

Valving Rod

Piston Rod

Trigger

Air Cap Adjustment Valve

Gun Block

Coupling Block

Mounting Screw

Overall View

6311320H

Centerline Components

FIG. 2: Centerline Components

Coupling Block Gaskets

Air Cap

Mixing Chamber Case

Snap Ring

Screen

Seal

A-Iso Check Valve

Screen Screw

Gun Block

Mounting Screw

O-Ring

Closure

Screw

Valving Rod

Assembly

Felt Wiper Retainer

Gun Block

R-Resin Check Valve

Screen Mounting Screw

Operation Basics

311320H 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 the spray guy through connection to a

Graco-approved grounded fluid supply hose.

Coupling Block

Install Coupling Block

1. Inspect coupling block gaskets for damage

and wear. Replace if necessary.

2. With gaskets in place, fit coupling block to

gun block.

3. Insert coupling block mounting screw and

tighten securely with 5/16 in. nut driver.

FIG. 3: Coupling Block

To prevent accidental gun operation, always

disconnect air supply before servicing gun or

anytime gun is not in use.

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 provid-

ing sufficient ventilation in the work area. If

sufficient ventilation is not available, a sup-

plied-air respirator is required for everyone in

the work area.

To prevent contact with isocyanates, appro-

priate personal protective equipment, includ-

ing chemically impermeable gloves, boots,

aprons, and goggles, is also required for

everyone in the work area.

CAUTION

To prevent cross-contamination of the gun’s

wetted parts, do not interchange A compo-

nent (isocyanate) and B component (resin)

parts. The gun is shipped with the A side on

the left.

Coupling Block

Gaskets

Coupling Block

Mounting Screw

Operation Basics

8311320H

Manual Valves

1. Open manual valves using 5/16 in. nut

driver; turn manual valves counterclock-

wise approximately three full turns. Do not

open until it bottoms out.

2. Close manual valves by turning fully clock-

wise.

FIG. 4: Manual Valves

Remove Coupling Block

1. Disconnect air hose.

2. Close both manual valves.

3. Remove coupling block mounting screw

(FIG. 3).

4. Separate coupling block from gun. Do not

lose gaskets.

5. Use gun cleaner to wipe clean mating sur-

face of gun block and coupling block. Cover

exposed opening with grease.

Triggering gun with manual valves closed

may cause crossover if gun ports contain

residual chemical.

Never open manual valves unless coupling

block is secured to gun or exit port is directed

into flush pail.

Manual Valves

To prevent release of pressurized chemical,

close both manual valves before removing

coupling block.

Operation Basics

311320H 9

Air Hose Connection

To CONNECT air hoses, pull back sleeve of

female fitting, insert male fitting and slide

sleeve forward to secure connection.

To DISCONNECT air hoses, pull back sleeve

of female fitting and remove male fitting.

FIG. 5: Air Hose Connection

Valving Rod Adjustment

Screw

Use to regulate amount of valving rod travel

when gun trigger is depressed with air supply

connected. Turn clockwise to decrease travel,

and counterclockwise to increase travel.

1. Use 5/64 in. hex key wrench to loosen fric-

tion lock.

2. Turn adjustment screw as required and

tighten friction lock until screw no longer

easily turns by hand.

3. Check friction lock periodically and tighten

as required to prevent screw from slipping

during operation.

FIG. 6: Valving Rod Adjustment Screw

Pull Sleeve

Friction Lock

Operation Basics

10 311320H

Air Cap Adjustment Valve

Use to control amount of air that passes

through air cap and over mixing chamber tip.

Airflow helps keep tip free of sprayed chemical.

Too much air may distort spray pattern and

create overspread. Too little air will not prop-

erly clean end of valving rod.

To OPEN valve, turn knob approximately 1/8

turn counterclockwise.

To CLOSE valve, turn knob fully clockwise.

FIG. 7: Air Valve Adjustment

Felt Wiper

Adjust Felt Wiper

1. Use 5/16 in. open-end wrench to loosen

retainer slightly.

2. Slowly tighten it by hand until it seats

against rear packings in mixing chamber.

3. Use 5/16 in. open-end wrench to tighten

retainer another half turn.

FIG. 8: Felt Wiper

Clean Felt Wiper

1. Insert nozzle of flush can into holes of felt

wiper.

2. Saturate felt with gun cleaner.

Open

Initial Set Up

311320H 11

Initial Set Up

1. Remove coupling block from gun.

2. Check valving rod clearance in closed posi-

tion. Rod should extend approximately 1/32

in. (1 mm) beyond tip of mixing chamber. If

it does not, see Valving Rod Adjustment

procedure, page 21.

FIG. 9: Valving Rod (Closed Position)

3. Adjust valving rod travel to initial setting.

a. Loosen friction lock. Turn valving rod

adjustment screw clockwise until it

stops.

b. Turn valving rod adjustment screw 11

turns counterclockwise.

4. Connect air supply hose to gun.

5. Connect A-isocyanate hose (red-taped) to

notched fitting on coupling block. Then con-

nect R-resin hose (blue-taped) to fitting

without notches on coupling block.

6. Close both manual valves.

7. Pressurize the A and R chemical hoses

and check for leaks. (See Proportioning

Unit manual.)

8. Bleed air from chemical hoses:

a. Hold coupling block with exit ports

pointed into disposable container.

b. Open each manual valve to allow

trapped air to escape. Bleed each side

until chemical is free of air.

c. Close both manual valves.

9. Use clean cloth soaked in gun cleaner to

wipe clean coupling block and its mating

surfaces.

10.Install coupling block to gun block.

11.Proceed with Daily Start-up procedure or

Shutdown procedure as required.

1/32 in.

CAUTION

To avoid accumulation of dirt and other con-

taminants, do not apply grease to mating

surfaces of coupling block.

Daily Start-Up

12 311320H

Daily Start-Up

1. Connect air supply to gun, page 9.

2. Adjust air cap valve, page 10.

3. Saturate felt in felt wiper with gun cleaner

using flush can.

4. Trigger gun multiple times to ensure valving

rod moves the full travel quickly and freely.

5. Open both manual valves, page 8.

6. Test spray on disposable surface and

adjust spray pattern as needed. (See Spray

Pattern Adjustment procedure, page 14.)

Daily Shutdown

1. Follow Pressure Relief Procedure, page

13.

2. Shut down proportioning unit as required.

Ensure gun is attached to coupling block and

air hose, and the proportioning unit is at

desired temperature and pressure.

CAUTION

Sluggish valving rod action may result in valving rod

sticking in open position when fluid pressure is

applied. Always have a 5/16 in. nut driver available to

quickly close manual valves on coupling block.

Do not exceed 1000 psi (7 MPa, 70 bar)

maximum fluid working pressure even in

static de-triggered conditions, or check

valve damage may result.

Follow when gun is out of service for any

length of time. Daily disassembly of gun for

cleaning is not recommended if it has been

operating properly. However, if you remove

the gun from the coupling block, flush and

clean thoroughly.

Pressure Relief Procedure

311320H 13

Pressure Relief Procedure

1. Close both manual valves.

2. Trigger gun once onto waste area to relieve

fluid pressure in front end of gun.

3. Disconnect gun air supply, page 9.

4. If gun is removed from coupling block, fol-

low Clean Spray Gun Procedure, page 18.

Relieve pressure before cleaning or repairing

gun.

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.

Manual Valves

Spray Pattern Adjustment

14 311320H

Spray Pattern Adjustment

1. Check valving rod clearance in closed posi-

tion. Rod should extend approximately 1/32

in. (1 mm) beyond tip of mixing chamber. If

it does not, see Valving Rod Adjustment

procedure, page 21.

FIG. 10: Valving Rod (Closed Position)

2. Adjust valving rod travel to initial setting.

a. Loosen friction lock. Turn valving rod

adjustment screw clockwise until it

stops.

b. Turn valving rod adjustment screw 11

times counterclockwise.

3. Locate point of valving:

a. Aim gun at disposable target.

b. Dispense short (1 second) bursts

toward target while simultaneously with-

drawing valving rod adjustment screw

from retainer case by 1/4-turn incre-

ments in counterclockwise direction.

c. Point of valving is reached when chemi-

cal stream mists as shown in FIG. 11.

FIG. 11: Point of Valving

4. Adjust spray pattern. Note position of notch

in hexhead of adjustment screw, then back

screw out counterclockwise the number of

turns specified in Table 1. Notice spray pat-

This adjustment may create a large mass

“bun” of urethane foam. Very high tempera-

tures created by chemical reaction inside a

bun may not dissipate after outside surface

has cooled. A large bun may continue to react

for several hours after spraying until flash

(burning) point of foam is reached. ALWAYS

break buns into smaller pieces so heat can

escape.

1/32 in.

Spray Pattern Adjustment

311320H 15

tern opens as adjustment is made (FIG.

12).

FIG. 12: Opening Spray Pattern

5. Fine tune spray pattern:

a. After you back out adjustment screw,

make fine adjustments (1/8 turns or less

in either direction as required) to obtain

pattern shown in FIG. 13. Moving the

screw out beyond this point may cause

the pattern to split, as shown in FIG. 14.

FIG. 13: Desired Pattern

FIG. 14: Split Pattern

b. If full-round pattern cannot be achieved,

ensure that material temperature and

spray pressure are correct. If pattern

remains closed upon reaching maxi-

mum specified number of turns out from

point of valving, material temperature is

too low

c. If pattern splits or has hollow center,

even with the adjustment screw at mini-

mum number of turns from point of valv-

ing, material temperature is too high.

Refer to FIG. 12.

d. After reaching satisfactory spray pat-

tern, note temperatures at proportioner

and hose, and position of notch on the

adjustment screw. As spraying pro-

ceeds, pattern may occasionally streak

or change. If this happens, inspect

chamber tip and remove any build-up of

solid foam with wooden stick or brass

wire brush.

Spray Pattern Adjustment

16 311320H

e. If buildup recurs shortly after cleaning

tip, remove air cap and ensure inside is

clean.

Reinstall air cap and ensure airflow is properly

set.

If no buildup occurred on air cap, check the fol-

lowing items in this order and readjust if neces-

sary:

• Check Valving Rod Adjustment

Screw/Sleeve setting.

• Check hose temperature setting.

• Check primary heater temperature setting.

• Ensure spray pressures between chemi-

cals are balanced. If they are not, refer to

Troubleshooting section of Proportioning

Unit Operation Manual for the proportioner

in use.

• Ensure flow of air to air cap is adequate but

not excessive.

Table 1: Valving Rod Adjustment for Standard Mixing Chambers

Chamber

Turns Out From Point of

Valving Recommended

Distance of Gun

from Surface Pattern SizeMinimum Maximum

46-800 1/2 turn 2 turns 12 in. (304-8 mm) 6 in. (152.4 mm)

46-810 1/2 turn 2 turns 12 in. (304-8 mm) 6 in. (152.4 mm)

55-776 1 3/4 turns 2 5/8 turns 18 to 20 in. (457.2

to 508 mm)

8 in. (203.2 to

228.6 mm)

62 2 turns 3 turns 18 to 20 in. (457.2

to 508 mm)

8 to 9 in. (203.2

to 228.6 mm)

70 2 turns 3 turns 18 to 20 in. (457.2

to 508 mm)

10 to 12 in. (254

to 304.8 mm)

78-851 2 turns 3 turns 24 in. (609.6 mm) 14 in. (355.6 mm)

Maintenance

311320H 17

Maintenance

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. 15: 1-Quart Gun Service Kit

For more information about the 1-Quart Gun

Service Kit, see manual 311340.

FIG. 16: 3-Gallon Gun Service Kit

For more information about the 3-Gallon Gun

Service Kit, see manual 311341.

Maintenance

18 311320H

Clean Spray Gun Procedure

Thoroughly flush gun block with gun cleaner

before removing valving rod or mixing compo-

nents from gun block. Also allow chemicals in

spray gun to cool before cleaning.

This procedure makes use of the 1-Quart or

3-Gallon Gun Service Kit.

1. Close both manual valves.

2. Remove gun from coupling block.

3. Attach service block of gun service kit to

spray gun, and then tighten using 5/16 in.

nut driver.

4. Pressurize container to 100 psi.

5. Open one manual valve on service block.

6. Trigger gun while holding against a

grounded waste container until there is a

fine, unobstructed mist of gun cleaner.

7. Release trigger of gun and 1-quart kit, and

close manual valves on service block.

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

9. After initial cleaning, remove air cap and

flush a second time to ensure thorough

cleaning.

10.Remove service block of gun service kit

from spray gun.

11.Disconnect air supply.

12.Clean screens, check valves and screen

screw. See Filter Screw Removal and Ser-

vice procedure, page 19.

Inspect air cap, mixing chamber, and gun

block for build up of material and clean as

required.

Do not use metal cleaning devices to clean

plastic components.

Repair

311320H 19

Repair

Filter Screen Removal and

Service

1. Perform Pressure Relief Procedure (page

13) and Clean Spray Gun Procedure, page

18.

2. Unthread screen mounting screw. Remove

screen mounting screw and filter screen

assembly from gun block.

FIG. 17: Filter Screen Assembly

3. Remove screen screw retainer (snap ring

at end of screw) and screen. If screen is

dirty and clogged, replace it.

4. Clean and inspect screen cavity. If particles

are visible, remove with cleanout drills and

flush thoroughly with gun cleaner.

5. Inspect seal, and replace if worn or dam-

aged.

6. Reinstall filter screen assembly. With seal

in place, install screen and retainer clip-on

screen screw.

7. Install screen assembly to gun block.

Ensure screw is tight to prevent leakage.

8. Flush gun after cleaning cavity and screen.

See Clean Spray Gun Procedure, page 18.

Shut down proportioner and allow chemicals

to cool before performing any repair proce-

dures.

Clean Center Line Components using Gun

Service Kit prior to performing any repair pro-

cedures.

Screen Screw

Seal

Screen

Snap Ring

Mounting Screw

CAUTION

Any remaining material in cavity on down

stream side of screen will clog mixing cham-

ber.

Repair

20 311320H

Clean Injection Slots

1. Perform Pressure Relief Procedure (page

13) and Clean Spray Gun Procedure, page

18.

2. Remove check valves.

FIG. 18: Check Valves

3. Inspect check valves to ensure sleeve is

secured, and place check valves in sepa-

rate containers of gun cleaner.

4. Flush cleanout ports with gun cleaner.

5. Turn valving rod adjustment screw one full

turn counterclockwise to ensure valving rod

will be withdrawn completely past injection

slot.

6. Clean mixing chamber injection slots. With

air supply connected to gun, depress and

hold trigger to keep valving rod in open

position. Insert appropriate cleanout spade

into cleanout hole and mixing chamber.

7. Flush injection slots. With valving rod in

open position, flush each injection slot with

gun cleaner. Press flush can needle firmly

into cleanout hole to create seal. Continue

until gun cleaner sprays out chamber tip.

8. Inspect and clean check valves, page 22.

9. Install tall hexhead check valve on Isocya-

nate side, and short hexhead on Resin

side.

10.Adjust valving rod adjustment screw one

turn clockwise.

CAUTION

To prevent damage to chamber, do not

release trigger while cleanout spade is in

chamber slot.

A-Iso Check Valve

(tall hexhead)

Clean-out Port

(both sides)

R-Resin Check Valve

(short hexhead)

Repair

311320H 21

Valving Rod Adjustment

In closed position, valving rod should extend

approximately 1/32 in. (1 mm) beyond tip of

mixing chamber. If it does not, follow this pro-

cedure:

FIG. 19: Valving Rod (Closed Position)

1. Perform Pressure Relief Procedure (page

13) and Clean Spray Gun Procedure, page

18.

2. Disconnect air supply from gun.

3. Remove spring retainer case. Firmly grasp

spring retainer case, push in and rotate

counterclockwise. Pull spring out of air cyl-

inder.

FIG. 20: Retainer Case Removal

4. Loosen felt wiper retainer 2-3 turns (DO

NOT REMOVE).

5. Remove valving rod. Push back firmly on

piston rod until end of Stop Bar emerges

from cylinder.

FIG. 21: Valving Rod Removal

6. Loosen stop bar from positioner. Turn posi-

tioner to adjust length of valving rod as

required. Retighten stop bar against posi-

tioner.

7. Replace valving rod, spring, and spring

retainer case. Grasp firmly, push in, and

turn clockwise to lock in place.

8. Adjust felt wiper and soak with gun cleaner.

9. Connect air supply to gun.

10.Check action of valving rod. With manual

valves closed, press trigger several times

and ensure valving rod moves freely.

If you have encountered no problems, spray

gun is ready for test spray. Follow Daily

Start-up procedure (page 12) and Spray Pat-

tern Adjustment procedure (page 14).

1/32 in.

Spring Retainer Case

Spring

Positioner

Stop Bar

Repair

22 311320H

Centerline Component

Removal

1. Perform Pressure Relief Procedure (page

13) and Clean Spray Gun Procedure, page

18.

2. Remove air cap by hand, turning it counter-

clockwise.

3. Remove screen screw assembly. Flush and

place in gun cleaner.

4. Remove check valves. Flush and place in

gun cleaner.

5. Flush screen screw and check valve ports.

6. Remove spring retainer case by firmly

grasping knob of case. Push in and rotate

counterclockwise to remove from air cylin-

der. Pull spring out of air cylinder.

7. Loosen felt wiper retainer 2-3 turns. DO

NOT REMOVE.

8. Remove valving rod. Push back firmly on

piston rod until end of valving rod stop bar

emerges from cylinder.

9. Remove gun block from frame.

10.Unscrew felt wiper assembly from rear of

mixing chamber. Keep rear of mixing cham-

ber in upright position to prevent possible

loss of internal chamber parts. Ensure

brass retaining sleeve is not stuck to felt

wiper. Place wiper assembly in gun

cleaner.

11.Remove mixing chamber. Hold gun block in

one hand with chamber tip pointing into

your palm. Insert mixing chamber knockout

tool into rear of gun block and tap with

hammer until chamber ejects. Place cham-

ber in gun cleaner.

FIG. 22: Mixing Chamber Removal

12.Remove closure screw in top of gun block.

Place screw in gun cleaner and clean entire

gun using appropriate cleanout tools and

brass brushes. Then flush thoroughly with

gun cleaner.

13.Disassemble check valve assemblies.

FIG. 23: Check Valves

Refer to Figure 2 to view centerline com-

ponents.

CAUTION

Matching tapers on mixing chamber and

center hole in gun block are machined to an

exact fit to hold chambers in place and cre-

ate a leak-proof seal. When handling or

cleaning these parts be careful not to dam-

age finish. Do not use metal tools to clean

these parts.

Mixing Chamber

Chamber

Knockout

Tool

Screw

Sleeve

Ball and Spring

Repair

311320H 23

a. Remove ball and spring assembly. Hold

ball and unscrew assembly. If dirt or

material build-up prevents complete

removal of the spring, screw it back in.

Soak assembly in gun cleaner and try to

remove it again. If ball and spring

assembly cannot be removed undam-

aged, replace it.

b. Use check valve cleanout drill to clean

inside of closure screw. Insert the flat-

tened end of cleanout drill into opening

at end of screw, avoiding spurs in the

closure screw. Do not spin drill until the

flat on the drill has cleared spurs. Spin

drill with your fingers to loosen any

buildup, then remove drill and flush

inside of screw with gun cleaner. Next,

check area where ball seats for dam-

age. Also check sleeve for damage; it

should fit tightly on the end of the screw.

If there is damage or if the sleeve fits

loosely, replace it. Replace sleeve if

check valve can be threaded all the way

into gun block by hand. A good check

valve requires the use of a 5/16 in. nut

driver to make the last 1/4 turn, com-

pressing the sleeve. This compression

is required to create an internal seal in

the gun block.

c. Remove damaged check valve sleeve.

Remove ball and spring. Insert check

valve into check valve sleeve removal

block (FIG. 24). While holding block, and

keeping pressure on head of check

valve, slice check valve sleeve with

razor knife at a 10 - 15 degree angle rel-

ative to the plane of removal block.

Remove check valve from block and

peel sleeve off. If check valve sleeve

remains in gun block after removing

check valve, use extractor tool to

remove sleeve. Insert threaded end of

tool into cleanout port and, while press-

ing tool into gun block, turn it clockwise

several times. Withdraw tool from gun

block; sleeve should slide out with tool.

FIG. 24: Sleeve Removal Block

d. Insert spring assembly into check valve

and turn the screw clockwise. When the

spring is fully inserted, stem will jump

over spurs in screw and make clicking

sound. Ensure ball fully seats in check

valve. If not, or ball is damaged, replace

with new ball and spring assembly.

14.Remove retaining ring, washer, and felt

wiper from retainer. Flush retainer with gun

cleaner, insert new felt wiper and washer,

then install retaining ring. Loosely thread

felt wiper retainer into rear of mixing cham-

ber (DO NOT TIGHTEN). If not installing to

gun block, store assembly in plastic vial

with corresponding cleanout spade.

Check Valve Sleeve

Insert Check Valve

Repair

24 311320H

Centerline Component

Installation

1. Remove felt wiper assembly from rear of

mixing chamber.

2. Ensure internal mixing chamber parts are

in place.

3. Insert chamber into gun block. Align key-

way in chamber with pin protruding from

top of hole in block.

FIG. 25: Mixing Chamber Insertion

4. Press chamber into block so that flange is

1/32 - 1/16 in. above face of gun block.

FIG. 26: Chamber Positioning

5. Thread felt wiper assembly into back of

mixing chamber. Do not tighten.

6. With rear of gun block facing palm of your

hand, place mixing chamber insertion block

over nose of chamber so it rests squarely

on the chamber flange. Firmly tap insertion

block with hammer until flange of chamber

is flush with face of gun block (FIG. 27).

FIG. 27: Chamber Seating

7. With o-ring in place on underside of gun

frame, assemble block to frame.

8. Install valving rod assembly. If using new

felt wiper, push valving rod through felt with

retainer case off chamber. Remove felt

wiper and any felt buildup on tip of rod.

Install wiper, hand tighten into rear of

chamber in gun block. Then insert valving

rod through piston in air cylinder, guiding it

through center of felt wiper retainer. Use

firm pressure to carefully push valving rod

into mixing chamber until piston of air cylin-

der bottoms out.

9. Check valving rod clearance. If it does not

extend approximately 1/32 in. (1mm)

beyond tip of mixing chamber, see Valving

Rod Adjustment, page 21.

All gun block parts must be clean and free

of damage before installation.

1/32 in.

1/16 in.

CAUTION

Failure to install felt wiper in rear of chamber

allows internal chamber parts to fall out

when chamber is tapped into place.

Chamber Insertion Block

Repair

311320H 25

10.Replace valving rod spring and spring

retainer case. Grasp knob, push in, and

turn clockwise to lock in place.

11.Replace air cap.

12.Replace check valves and screen screw

assembly.

13.Replace closure screw in top of gun block.

14.Mount gun onto coupling block.

15.Connect air supply to gun.

16.Adjust felt wiper and soak felt with gun

cleaner.

17.Close manual valves and press trigger sev-

eral times to ensure valving rod moves

freely.

Parts

26 311320H

Parts

Model D Spray Gun Assembly

Parts

311320H 27

Model D Spray Gun Assembly

❄ Purchase Air Valve Repair Kit 296125 (purchase sep-

arately). Includes Needle Valve Packing.

★ Not shown.

Table 1: Model D Gun Assembly, Parts by Model Number

Ref.

No. Part No. Description Qty.

A 295591 Hex nipple, 1/8 in. MPT, steel 1

B 295185 Mounting screw, 1/2 in. LG 2

C 296090 Ball and spring assembly

(pack of 10)

D 296091 Check valve sleeve

(pack of 10)

E 296614 Kit, A-check valve, includes C

and D (pack of 10)

F 296615 Kit, R- check valve, includes C

and D (pack of 10)

G 295592 Roll pin, 1/16 x 5/16 in. SST 1

H Snap ring (see J) 1

J 296616 Trigger button; includes H 1

K Valving rod (see Table 1) 1

L Valving rod positioner (see M) 1

M 296617 Valving rod stop bar;

includes L

N 295171 Valving rod stop adjustment

screw

R 296618 Valving rod closure spring 1

S❄Air valve 1

T 296620 Pipe nipple 1

U 296621 Screen screw seal

(pack of 10)

V 296622

296623

Screen-80 mesh (pack of 10)

Screen-80 mesh (pack of 50)

W 295595 Snap ring 1

X 296624 Kit, gun block screen screw

(includes U, V, W)

Y296611

297139

Felt wiper assembly (includes

retainer, wiper, washer) (pack

of 5)

Felt wiper (pack of 15) and

retainer washers (pack of 3)

Z 111450 O-ring 1

AA 296625 Coupling block gasket

(pack of 2)

AB 296121 D gun block, complete

(includes G, AA, AP)

AC Mixing chamber (includes Y)

(see Table 1)

AD 295590 Gun frame 1

AE 296629 Spring retainer case (includes

AF Air cylinder (see page 30) 1

AG 296633 Needle valve and packing kit 1

AJ 295182 Needle valve body 1

AK Air cap (see Table 1) 1

AL 295183 Retainer nut/dust cover 1

AM 296126 Gun air tube, includes D

(qty. 2)

AN 15B772 Air hose 1

AP 295482 Closure screw 1

AQ 295596 Coupler plug 1

AR 295597 Coupler 1

AS 103557 O-ring 1

AT 100030 Fitting 1

Ref.

No. Part No. Description Qty.

Model No. Description

Valving

Rod (K)

Mixing

Chamber

(AC)

Air Cap

(AK)

Cleanout

Spade★

Coupling

Block (see

page 31) Tool Kit★

295530 D-55 296579 296597 296634 295934 295887 296636

295531 D-55-

RECIRC 296579 296597 296634 295934 295884 296636

295532 D-62 296580 296598 296634 295935 295887 296636

295533 D-70 296581 296599 296635 295935 295887 296636

Parts

28 311320H

Table 2: Model D Gun Assembly, Parts by Mixing Chamber Size

Mixing Chamber Size

Reference Size 46 55 62 70 78

K (valving rod) 296578 296579 296580 296581 296582

AC (chamber)

296594 (N-800)

296595 (N-810)

296584 (L-800)

296590 (L-800-LM)

296585 (L-810)

296591 (L-810-LM)

296597 (N)

296586 (L)

296592 (L-LM)

296598 (N)

296587 (L)

296599 (N)

296588 (L)

296600 (N)

297592 (L)

AK (air cap) 296838 296634 296634 296635 296635

Cleanout

spade

297007

(pack of 2)

295934

(pack of 2)

295935

(pack of 2)

295935

(pack of 2)

295935

(pack of 2)

Parts

311320H 29

Standard Mixing Chambers

Six standard mixing chambers are available. The following table provides a general description

about use and operational performance of each chamber. Actual pattern sizes and outputs

achieved may vary depending on material viscosity, hose length, condition of equipment, environ-

ment, working pressure, and additional factors.

46 Size

296594 (N-800)

296584 (L-800)

296590 (L-800-LM)

Designed for operation in confined areas and for spraying 3/8 to 1/2-in. (.7 to

1.3 cm) thicknesses. Gun may be held within 4 in. (10.2 cm) of target without

blowing away freshly applied foam. Pattern diameter is approximately 4 in.,

with gun 4-in. (10.2-cm) distance from target. Output is approximately 2 to

3-1/4 pounds/min. (.9 to 1.5 kg/min.).

46 Size

296595 (N-810)

296585 (L-810)

296591 (L-810-LM)

For the same uses as above. These chambers have an increased output of

approximately 3 to 4-1/2 pounds/min. (1.4 to 2.0 kg/min.).

55 Size

296597 (N)

296586 (L)

296592 (L-LM)

Designed for stud areas of trucks and small- to medium-sized wall applica-

tions. Pattern diameter is about 8 in. (20.3 cm), with gun 18 to 20 in. (45.7 to

50.8 cm) from target. Output is approximately 6 to 8 pounds/min. (2.7 to 3.6

kg/min.).

62 Size

296598 (N)

296587 (L)

For very large area applications. Pattern diameter is about 9 in. (22.9 cm)

with gun 18 to 20 in. (45.7 to 50.8 cm) from target. Output range is about 7

to 10 pounds/min. (3.2 to 4.5 kg/min.).

70 Size

296599 (N)

296588 (L)

For very large area applications. Pattern diameter is about 10 in. (25.4 cm)

with gun 18 to 20 in. (45.7 to 50.8 cm) from target. Output range is about 9

to 12 pounds/min. (4.1 to 5.4 kg/min.).

78 Size

296600 (N)

297592 (L)

For very large area applications. Pattern diameter is about 14 in. (35.6 cm)

with gun 24 in. (60.9 cm) from target. Output range is about 13-1/2 to 16-1/2

pounds/min. (6.1 to 7.5 kg/min.).

Parts

30 311320H

Air Cylinder Assembly

Part Number 296632

❄ Parts included in Air Cylinder Seal Kit 296725 (purchase separately)

▲ Replacement Danger and Warning labels, tags, and cards are available at no cost.

Ref.

No. Part No. Description Qty.

A❄107083 O-ring, fluoroelastomer 1

B 295494 Pan head machine screw,

8-32 x 3/16 in.

C 295177 Front head blank 1

D❄296627 U-cup (pack of 5)

E❄296628 U-cup (pack of 5)

F 295178 Cylinder 1

G❄296631 Wear ring 1

H 295179 Buttonhead cap screw 3

J 295484 Piston assembly 1

K▲295492 Label, warning 1

Parts

311320H 31

Coupling Block Assembly

Model 295887 (Standard) Model 295884 (Recirc)

Model 295887

Model 295884

Ref.

No. Part No. Description Qty.

A 295662 Flush seal pipe plug, 1/8 in. 2

B 295888 R-swivel fitting 1

C 295889 A-swivel fitting 1

D 296626 Manual valve assembly (pack

of 2)

E 295619 Mounting screw, 15/16 in. 1

F 295693 Flush seal pipe plug, 1/36 in. 2

G 295886 Coupling block 1

Ref.

No. Part No.Description Qty.

A 295889 A-swivel fitting 2

B 296626 Manual valve assembly (pack

of 2)

C 295619 Mounting screw 1

D 295693 Pipe plug 2

E 112307 Street elbow 2

F 295886 Coupling block 1

G 295888 R-swivel fitting 2

Notes

32 311320H

Notes

Technical Data

311320H 33

Technical Data

* Theoretical: actual results will vary with operating conditions

Category Data

Maximum Fluid Working Pressure 1000 psi (7 MPa, 70 bar)

Maximum Air Inlet Pressure 100 psi (0.75 MPa, 7.5 bar)

Minimum Air Inlet Pressure 90 psi (0.6 MPa, 6 bar)

Maximum Output (flow rate) 16 lbs/min (7.3 kg/min) *

Minimum Output (flow rate) 2 lbs/min (0.9 kg/min) *

Air Inlet Size x npt

A Component (ISO) Inlet Size -5 JIC; 1/2-20 UNF

R Component (Resin) Inlet Size -6 JIC; 9/16-18 UNF

Length 9.25 in. (24 cm)

Height 8 in. (20 cm)

Width (without coupling block) 2.4 in. (6 cm)

Weight 3 lbs. (1.4 kg)

Wetted Parts Stainless steel, carbon steel, brass, nylon, ace-

tal, PTFE

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

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

For patent information, see www.graco.com/patents.

Original instructions. This manual contains English. MM 311320

Graco Headquarters: Minneapolis

International Offices: Belgium, China, Japan, Korea

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

www.graco.com

Revised February 2012

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.

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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

Graco 311320H D Spray Gun Users Manual Gun, Operation, Parts, Service, And Repair, English

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