Graco 295530 Quick start guide

311320G
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.
ENG

Models
2311320G
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
311320G 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.
•FollowPressure Relief Procedure in this manual, when you stop spraying and before
cleaning, checking, or servicing equipment.

Warnings
4311320G
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.
•FollowPressure Relief Procedure in this manual, when you stop spraying and before
cleaning, checking, or servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
WARNING

Overall View
311320G 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
Coupling Block
Mounting Screw

Overall View
6311320G
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
311320G 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
8311320G
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
311320G 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 311320G
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
Close

Initial Set Up
311320G 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 311320G
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
311320G 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 311320G
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
311320G 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 311320G
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
311320G 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 311320G
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
311320G 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 311320G
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)