Graco 311322H Quick start guide

Operation, Parts, Service and Repair
GAP Pro Spray Gun
For use with non-flammable polyurethane foams. Not for use in explosive
atmospheres.
See page 3 for model information.
3000 psi (20.7 MPa, 207 bar) Maximum Working Fluid Pressure
125 psi (0.86 MPa, 8.6 bar) Maximum Working Air Pressure
Important Safety Instructions
Read all warnings and instructions
in this manual. Save these instructions.
311322H

2311322H
Contents
Gun Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Overall View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Major Components . . . . . . . . . . . . . . . . . . . . . . . 6
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Isocyanate Hazard . . . . . . . . . . . . . . . . . . . . . . . 8
Keep A and B Components Separate . . . . . . . . . 8
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Safety Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Manual Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Air Hose Configurations . . . . . . . . . . . . . . . . . . 10
Initial Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Daily Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pressure Relief Procedure . . . . . . . . . . . . . . . . 12
Grease Gun . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Side Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mixing Chamber and Gun Block . . . . . . . . . . . . 15
End Cap and Air Piston . . . . . . . . . . . . . . . . . . . 17
End Cap O-ring and Safety Stop Seal . . . . . . . . 19
Trigger/Air Valve . . . . . . . . . . . . . . . . . . . . . . . . 21
Air Passage Diagrams . . . . . . . . . . . . . . . . . . . . 23
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
GAP Pro Spray Gun Assembly . . . . . . . . . . . . . 26
GAP Pro Spray Gun Handle Assembly . . . . . . . 30
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 34
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 34

Gun Models
311322H 3
Gun Models
★Flat pattern guns are sold without a spray
tip. See Flat Spray Tip Kits, page 32 for tip
choices.
Part No. Description Mix Module
295550★Flat Pattern Gun #00 flat
295551★Flat Pattern Gun #01 flat
295552★Flat Pattern Gun #02 flat
295553★Flat Pattern Gun #03 flat
295554★Flat Pattern Gun #04 flat
295556★Flat Pattern Gun #05 flat
295557 Round Pattern Gun #00 round
295558 Round Pattern Gun, Recirculating #00 round
295559 Round Pattern Gun #01 round
295560 Round Pattern Gun #02 round
295561 Round Pattern Gun #03 round
295562 Round Pattern Gun #04 round

Warnings
4311322H
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 appli-
cable guidelines.
SKIN INJECTION HAZARD
High-pressure fluid from gun, hose leaks, or ruptured components will pierce skin. This
may look like just a cut, but it is a serious injury that can result in amputation. Get
immediate surgical treatment.
• Do not point gun at anyone or at any part of the body.
• Do not put your hand over the spray tip.
• Do not stop or deflect leaks with your hand, body, glove, or rag.
• Do not spray without tip guard and trigger guard installed.
•FollowPressure Relief Procedure in this manual, when you stop spraying and
before cleaning, checking, or servicing equipment.
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 immedi-
ately.

Warnings
311322H 5
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 Tech-
nical Data in all equipment manuals. Read fluid and solvent manufacturer’s warn-
ings. 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 ALUMINUM PARTS HAZARD
Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon
solvents or fluids containing such solvents in pressurized aluminum equipment. Such
use can cause serious chemical reaction and equipment rupture, and result in death,
serious injury, and property damage.
WARNING

Overall View
6311322H
Overall View
Major Components
FIG. 1. Major Components (shown with round spray tip)
A-Screen
Screw
A-Manual Valve
Spray Tip
R-Screen
Screw
Trigger
Safety Stop
R-Manual
Valve

Overall View
311322H 7
FIG. 2. Front End Components (shown with flat spray tip assembly)
!2
Side Block
Screws
A-Side
Block
Gun Block
Screws
Air Seal
Air Cap
Flat Tip
R-Side Block
Gun Block
Mixing
Chamber
O-Ring

Operation
8311322H
Operation
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 gun through connection to a
Graco-approved grounded fluid supply hose.
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.

Operation
311322H 9
Safety Stop
The GAP Pro gun has a 2-position safety stop.
When engaged, it prevents accidental trigger-
ing of gun. When disengaged, it allows gun to
dispense.
1. To engage the safety stop, push in and
turn the safety stop knob clockwise. See
FIG. 3.
2. To disengage the safety stop, push in
and turn the safety stop knob counterclock-
wise. See FIG. 4.
Manual Valves
Manual valves located on the side blocks con-
trol flow of each chemical component to gun.
1. Open manual valves using a 5/16 in. nut
driver; turn manual valves counterclock-
wise approximately three full turns.
2. Close manual valves by turning fully clock-
wise.
Always engage safety stop, close both man-
ual valves, and disconnect air before clean-
ing, maintaining, or repairing gun, or any time
gun is not in use.
FIG. 3. Engage Safety Stop
FIG. 4. Disengage Safety Stop
Triggering gun with manual valves closed
may cause crossover if gun ports contain
residual chemical.
Always engage safety stop, close both man-
ual valves, and disconnect air before clean-
ing, maintaining, or repairing gun, or any time
gun is not in use.
Never open a manual valve unless side block
is secured to gun or exit port is directed into
flush pail.
FIG. 5. Manual Valves
!2
Manual
Valves
Coupling
Blocks

Operation
10 311322H
Air Hose Configurations
The GAP Pro Gun has two possible air hose
configurations. In the standard configuration,
the air connection is at the base of the handle.
In the optional configuration, the air connection
is at the rear of the gun.
1. See FIG. 6. Remove air hose from nipple at
base of gun handle.
2. Remove nipple from gun handle.
3. Remove pipe plug from back of gun.
4. Install pipe plug in base of gun handle.
5. Install nipple in back of gun.
6. Connect air hose to nipple and use wrench
to tighten.
Always engage safety stop, close both man-
ual valves, and disconnect air before chang-
ing air hose configuration.
FIG. 6. Air Hose Configuration
2
!
Air Hose
Install Pipe Nipple
Remove
Pipe Plug
Install Pipe Plug
Remove Long Pipe Nipple

Operation
311322H 11
Initial Set Up
1. Close both manual valves.
2. Engage safety stop.
3. Install female quick disconnect fitting on air
hose, which is bundled with fluid supply
hoses.
4. Connect A-isocyanate hose (red-taped) to
fitting on A-side block. Then connect
R-resin hose (blue-taped) to fitting on
R-side block.
5. Pressurize A and R chemical hoses and
check for leaks. (See Proportioning Unit
manual.)
6. Check proportioning unit for proper hose
temperature, heater temperature, and pres-
sure. (See Proportioning Unit manual.)
7. Connect air supply hose to gun.
8. Open both manual valves, page 9.
9. Disengage safety stop.
10.Test spray on disposable surface.
11.Proceed with Daily Start-up procedure or
Shutdown procedure as required.
Daily Start-Up
1. Connect air supply to gun, page 10.
2. Trigger gun multiple times to ensure proper
mixing chamber movement.
3. Open both manual valves, page 9.
4. Disengage safety stop.
5. Test spray on disposable surface.
Daily Shutdown
1. Follow Pressure Relief Procedure, page
12.
2. Shutdown proportioning unit as required.
3. Grease gun, page 12.
A and R side hoses are sized differently to
prevent improper connection.
Ensure side blocks are attached to gun, and
proportioning unit is at desired temperature
and pressure.
Follow this procedure when gun is out of
service for any length of time. Daily disas-
sembly of gun for cleaning is not recom-
mended if it has been operating properly.
However, if you remove gun from coupling
block, flush and clean thoroughly.

Operation
12 311322H
Pressure Relief Procedure
1. Close both manual valves.
2. Engage safety stop.
3. Trigger gun once onto waste area to relieve
fluid pressure in gun front end.
4. Disconnect gun air supply, page 10.
Grease Gun
1. Follow Pressure Relief Procedure, page
12.
2. Insert GAP Gun Chamber Lubricant Nee-
dle into nozzle of mixing chamber. Dis-
pense a small amount of lubricant into
mixing chamber.
3. Connect gun air supply.
4. With safety stop engaged, trigger gun 2 or
3 times to discharge any excess lubricant.
5. Disconnect gun air supply, page 10.
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.
Do not grease gun if gun will be serviced
following shutdown.
To determine correct amount of lubricant,
remove air cap to view internal chamber
area. When lubricant becomes visible,
stop dispensing.

Repair
311322H 13
Repair
Side Blocks
1. Follow Pressure Relief Procedure, page
12.
2. See FIG. 7. Remove A-side screen screw,
seal, and screen. Inspect for damage.
Thoroughly rinse and dry screen. Hold
screen up to a bright light; mesh must be
free of particles and material buildup.
Replace as necessary. Repeat for R-side.
3. Alternately loosen side block mounting
screws. Carefully separate side blocks from
gun. Wipe mating surfaces with a rag
soaked in gun cleaner.
4. Remove check valve retainer/side seal
assembly from A-side block.
Shutdown proportioner and allow chemicals
to cool before performing any repair proce-
dures.
FIG. 7. Side Block Components
2
Manual Valve Assembly
Check Valve Assembly
Spring
Check Valve Retainer
Side Seal
O-Ring
Side Seal Assembly
Swivel Fitting
Screen
Screen Screw
Screen Screw Seal
Side Block

Repair
14 311322H
5. Remove check valve and clean with gun
cleaner. Inspect and replace if damaged.
6. Remove side seal and o-ring. Replace if
damaged.
7. Clean all components thoroughly. Use
brass brushes or drill bits to remove resid-
ual chemical from the gun block. Thorough
cleaning ensures unrestricted movement of
mixing chamber. Use cotton swabs soaked
in gun cleaner if necessary.
8. Repeat steps 4-7 for R-side block.
9. Place check valve assembly in check valve
retainer and thread into side block finger-
tight. Use a 1/2 in. wrench to tighten
retainer 1/4 turn and no more. See FIG. 8.
10.Check side seal for wear by measuring how
far seal protrudes from side seal assembly
insert. A worn side seal promotes chemical
leakage. Replace side seal if it protrudes
0.065 in. (1.65 mm) or less. In addition,
check seal for scratches, which also pro-
mote leakage. See FIG. 9.
11.Inspect check valve assembly for damage
by measuring gap between mating surface
of side block and bottom edge of side seal
assembly insert. If gap measures 0.018 in.
(.46 mm) or less, the check valve assembly
has been crushed due to overtightening
and it must be replaced. See FIG. 9.
12.Place spring in check valve retainer.
13.Lightly coat o-ring with grease and install
on side seal.
14.Push side seal into the check valve retainer
until o-ring engages detent groove and
remains in place.
15.Install side blocks to gun body with two
mounting screws. Tighten screws alter-
nately and evenly to prevent leakage.
16.Return gun to service. See Daily Start-Up,
page 11.
CAUTION
Clean side seals with a wooden or plastic
scraper or a brass brush. Do not use a pock-
etknife, razor blade, or any tool that may
scratch surface.
CAUTION
Do not overtighten check valve retainer.
Tightening more than 1/4 turn can damage
check valve or retainer and cause leaking
when gun is pressurized.
FIG. 8. Tighten Check Valve Retainer


One quarter of a
full turn (max.)
FIG. 9: Side Seal
.018 in.
(0.46 mm)
.065 in.
(1.65 mm)

Repair
311322H 15
Mixing Chamber and Gun
Block
1. Follow Pressure Relief Procedure, page
12.
2. Remove flat tip assembly from end of mix
module.
3. Remove air cap.
4. Use a 5/16 in. nut driver to alternately
loosen side block mounting screws. Care-
fully separate side blocks from gun. Wipe
mating surfaces with a rag soaked in gun
cleaner.
5. Remove gun block bolts. Slide gun block
away from gun. Wipe mating surfaces with
a rag soaked in gun cleaner. Clean gun
block with gun cleaner and brass brushes
to remove residual chemical and built-up
material. This ensures unrestricted move-
ment of mixing chamber.
6. Use a 3/16 in. wrench or needle-nose pliers
to hold end of piston shaft while unscrewing
mixing chamber by hand. Clean mixing
chamber with gun cleaner and drill bits.
Inspect for damage and replace if neces-
sary.
7. Hold end of piston shaft with a 3/16 in.
wrench or needle-nose pliers. Screw mix-
ing chamber onto shaft by hand.
8. Slide gun block over mixing chamber and
up to gun. Install two mounting screws.
Tighten screws alternately and evenly to
prevent leakage.
9. Install side blocks to gun body with two
mounting screws. Tighten screws alter-
nately and evenly to prevent leakage.
10.Return gun to service. See Daily Start-Up,
page 11.
If your gun has a round pattern spray tip,
skip step 2 and go to step 3.
To repair side blocks, see Side Blocks,
page 13.

Repair
16 311322H
FIG. 10. Mixing Chamber and Gun Block
!2
Side Block
Screws
O-Ring
Mixing Chamber
Gun Block
R-Side Block
A-Side Block
Gun Block
Screws
Air Seal
Flat Tip
Air Cap

Repair
311322H 17
End Cap and Air Piston
1. Follow Pressure Relief Procedure, page
12.
2. Use a 5/16 in. nut driver to alternately
loosen side block mounting screws. Care-
fully separate side blocks from gun. Wipe
mating surfaces with a rag soaked in gun
cleaner.
3. Use a 5/16 in. nut driver to remove gun
block mounting screws. Slide gun block
away from gun. Wipe mating surfaces with
a rag soaked in gun cleaner. Be sure to
retain o-ring located between gun block
and mounting flange.
4. See FIG. 11. Use a 3/16 in. wrench or nee-
dle-nose pliers to hold end of piston shaft
while unscrewing mixing chamber by hand.
5. Disengage safety stop.
6. Use a 9/64 in. ball point hex key to remove
socket head screw and clamp from rear of
air cylinder.
7. Use a retaining ring pliers to remove retain-
ing ring. Ring retains end cap position in air
cylinder.
To repair side blocks, see Side Blocks,
page 13.
To repair gun block, see Mixing Chamber
and Gun Block, page 15.
To repair mixing chamber, see Mixing
Chamber and Gun Block, page 15.
FIG. 11. End Cap and Piston Assembly
Mixing Chamber
Piston Assembly
Piston Spring
End Cap/Safety
Stop Assembly
Socket Head
Cap Screw
Retaining Ring
Cylinder
Clamp

Repair
18 311322H
8. Pull safety stop until it and attached end
cap come free from air cylinder. Be sure to
retain piston spring, located inside cylinder.
9. Inspect end cap o-ring and remove if dam-
aged. Lightly coat new o-ring with
Lubriplate grease and install on end cap.
10.Pull piston assembly out of air cylinder.
11.See FIG. 12. Remove retaining ring and
slide piston shaft out from the back of pis-
ton.
12.Inspect shaft and piston o-rings and
replace if damaged. Lightly coat new
o-rings with Lubriplate grease before
installing.
13.Slide piston shaft into the back of piston,
being careful not to damage shaft o-rings.
Secure with retaining ring.
14.Install piston assembly into the air cylinder.
See FIG. 11.
15.Center piston spring over raised portion of
piston. Align raised portion of end cap with
inside diameter of piston spring. Insert end
cap into air cylinder. Press end cap until it
moves past the undercut groove in air cylin-
der, which is where retaining ring nests.
Maintain pressure on end cap, ensure
groove remains visible, and install retaining
ring using retaining ring pliers.
16.Reinstall socket head screw and cylinder
clamp in rear of air cylinder.
17.Hold end of piston shaft with a 3/16 in.
wrench or needle-nose pliers. Screw the
mixing chamber onto shaft by hand.
18.Slide gun block over mixing chamber and
up to gun. Install two mounting screws.
Tighten screws alternately and evenly to
prevent leakage.
19.Install side blocks to gun body with two
mounting screws. Tighten screws alter-
nately and evenly to prevent leakage.
20.Return gun to service. See Daily Start-Up,
page 11.
Removing safety stop and end cap
requires some force because o-ring is
tightly compressed.
FIG. 12. Piston Assembly
Piston Shaft
Piston Shaft
O-Rings
Piston
Piston O-Ring
Retaining Ring
Be sure to insert retaining ring completely into
groove so end cap will remain in air cylinder
when gun is pressurized. Keep clear of end
cap when reapplying air pressure or trigger-
ing gun after reassembly in case of improper
retaining ring installation

Repair
311322H 19
End Cap O-ring and Safety
Stop Seal
1. Follow Pressure Relief Procedure, page
12.
2. Use a 5/16 in. nut driver to alternately
loosen side block mounting screws. Care-
fully separate side blocks from gun. Wipe
mating surfaces with a rag soaked in gun
cleaner.
3. Remove socket head screw and clamp
from rear of air cylinder.
4. See FIG. 13. Use a retaining ring pliers to
remove retaining ring. Ring retains end cap
position in air cylinder.
5. Pull safety stop until it and attached end
cap come free from air cylinder. Be sure to
retain piston spring, which is located inside
cylinder.
6. Inspect end cap o-ring and replace if dam-
aged. Lightly coat new o-ring with
Lubriplate grease and install on end cap.
To repair side blocks, see Side Blocks,
page 13.
Removing safety stop and end cap
requires some force because o-ring is
tightly compressed.
FIG. 13. End Cap Assembly
End Cap/Safety
Stop Assembly
Retaining Ring
Cylinder Clamp
Socket Head
Cap Screw

Repair
20 311322H
7. See FIG. 14. Use a 5/64 in. hex key to
loosen two setscrews on stop knob. Slide
knob off shaft of stop pin. Retain shaft
spring. Pull stop pin out of end cap.
8. Remove u-cup seal from end cap and
replace if damaged. Lightly coat new seal
with Lubriplate grease before installing;
u-cup lips must face the air cylinder.
9. Insert stop pin into end cap. Slide shaft
spring and stop knob onto shaft of stop pin.
Use a 5/64 in. hex key to install two set
screws in stop knob. Ensure knob set
screws are aligned to flats on stop pin and
tighten securely.
10.Center piston spring over raised portion of
piston. Align raised portion of end cap with
inside diameter of piston spring. Insert end
cap into air cylinder. Press end cap until it
moves past undercut groove in air cylinder,
which is where retaining ring nests. Main-
tain pressure on end cap, ensure groove
remains visible, and install retaining ring
using retaining ring pliers. See FIG. 13.
11.Reinstall socket head screw and cylinder
clamp in rear of air cylinder.
12.Install side blocks to gun body with two
mounting screws. Tighten screws alter-
nately and evenly to prevent leakage.
13.Return gun to service. See Daily Start-Up,
page 11.
FIG. 14. Safety Stop Assembly
Stop Pin
Cup Seal
End Cap O-Ring
Set Screws
Stop Knob
Stop Spring
End Cap
Be sure to insert retaining ring completely into
groove to ensure end cap remains in air cylin-
der when gun is pressurized. Keep clear of
end cap when reapplying air pressure or trig-
gering gun after reassembly in case of
improper retaining ring installation