Graco 311320H User Manual
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.
311320H
EN
Models
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
Models
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
Part No. Description Mix Module
295530 D-55 296597
295531 D-55-RECIRC 296597
295532 D-62 296598
295533 D-70 296599
2 311320H
Warnings
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.
311320H 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 311320H
Overall View
Major Components
Overall View
Spring Retainer Case
Valving Rod Closure Spring
Gun Block
Coupling Block
Valving Rod Positioner
Valving Rod
Adjustment Screw
Valving Rod Stop Bar
Valving Rod
Piston Rod
Trigger
Air Cap Adjustment Valve
Coupling Block
Mounting Screw
FIG. 1: Major Components
311320H 5
Overall View
Centerline Components
Gun Block
Mounting Screw
Screen Screw
Valving Rod
Assembly
Felt Wiper Retainer
Gun Block
R-Resin Check Valve
Screen Mounting Screw
FIG. 2: Centerline Components
O-Ring
Closure
Screw
A-Iso Check Valve
Seal
Screen
Snap Ring
Mixing Chamber Case
Air Cap
Coupling Block Gaskets
6 311320H
Operation Basics
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.
Grounding
Check your local electrical code and proportioner manual for detailed grounding instructions.
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.
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.
Coupling Block
Gaskets
Keep A and B Components Separate
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.
311320H 7
Coupling Block
Mounting Screw
FIG. 3: Coupling Block
Operation Basics
Manual Valves
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.
1. Open manual valves using 5/16 in. nut
driver; turn manual valves counterclockwise approximately three full turns. Do not
open until it bottoms out.
2. Close manual valves by turning fully clockwise.
Remove Coupling Block
To prevent release of pressurized chemical,
close both manual valves before removing
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 surface of gun block and coupling block. Cover
exposed opening with grease.
Manual Valves
FIG. 4: Manual Valves
8 311320H
Operation Basics
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.
Pull Sleeve
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 friction 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.
Friction Lock
FIG. 6: Valving Rod Adjustment Screw
311320H 9
Operation Basics
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 properly clean end of valving rod.
To OPEN valve, turn knob approximately 1/8
turn counterclockwise.
To CLOSE valve, turn knob fully clockwise.
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.
Open
Close
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.
2. Saturate felt with gun cleaner.
10 311320H
Initial Set Up
Initial Set Up
1. Remove coupling block from gun.
2. Check valving rod clearance in closed position. 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.
1/32 in.
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. 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.
CAUTION
To avoid accumulation of dirt and other contaminants, do not apply grease to mating
surfaces of coupling block.
10.Install coupling block to gun block.
11.Proceed with Daily Start-up procedure or
Shutdown procedure as required.
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 connect 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.
311320H 11
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