Graco 312888D User Manual
Operation - Parts
AR Pour Gun
For use with non-flammable polyurethane foams.
Not for use in explosive atmospheres.
Part No. 255828
2000 psi (13.8 MPa, 138 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
312888D
Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Isocyanate Hazard . . . . . . . . . . . . . . . . . . . . . . . . . 5
Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . . 5
Moisture Sensitivity of Isocyanates . . . . . . . . . . . . 5
Keep Components A and B Separate . . . . . . . . . . 5
Foam Resins with 245 fa Blowing Agents . . . . . . . 5
Changing Materials . . . . . . . . . . . . . . . . . . . . . . . . . 5
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Air Hose Connection . . . . . . . . . . . . . . . . . . . . . . 8
Coupling Block . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Initial Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Daily Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pressure Relief Procedure . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gun Service Kits . . . . . . . . . . . . . . . . . . . . . . . . 13
Daily Cleaning Procedure,
with Gun Service Kit . . . . . . . . . . . . . . . . . 13
Daily Cleaning Procedure,
without Gun Service Kit . . . . . . . . . . . . . . . 14
Flush Gun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Trigger Gun While Disconnected . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pattern Control Tip . . . . . . . . . . . . . . . . . . . . . . 16
Screen Screw and Port Closure Plugs . . . . . . . 16
Valving Rod and Resilient Sleeve . . . . . . . . . . . 17
Coupling Block and Check Valves . . . . . . . . . . . 18
Impingers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Gun Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Pressure Check Valving Rod Resilient Sleeve . 21
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
AR Pour Gun 255828 . . . . . . . . . . . . . . . . . . . . 23
AR-D Conversion Kit 24A023 . . . . . . . . . . . . . . 29
Electrical Diagram . . . . . . . . . . . . . . . . . . . . . . . . 30
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Performance Charts . . . . . . . . . . . . . . . . . . . . . . . 31
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 32
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 32
2 312888D
Warnings
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbol refers to procedure-specific risk. Refer back
to these warnings. Additional, product-specific warnings may be found throughout the body of this manual where
applicable.
WARNING
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or
swallowed.
•
Read 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.
•
Always wear impervious gloves when spraying or cleaning equipment.
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
SKIN INJECTION HAZARD
High-pressure fluid from dispense valve, 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 dispense valve at anyone or at any part of the body.
•
Do not put your hand over the end of the dispense nozzle.
•
Do not stop or deflect leaks with your hand, body, glove, or rag.
•
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.
312888D 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 and clean 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 lights on or off when flammable fumes are present.
•
Ground equipment, personnel, object being sprayed, and conductive objects in work area. See
Grounding instructions.
•
Use only Graco grounded hoses.
•
Check gun resistance daily.
•
If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment
until you identify and correct the problem.
•
Do not flush with gun electrostatics on. Do not turn on electrostatics until all solvent is removed from
system.
•
Keep a working fire extinguisher in the work area.
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
•
Do not operate the unit when fatigued or under the influence of drugs or alcohol.
•
Do not exceed the maximum working pressure or temperature rating of the lowest rated
system component. See Technical 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
manufacturer’s replacement parts only.
•
Do not alter or modify equipment.
•
Use equipment only for its intended purpose. Call your distributor for information.
•
Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
•
Do not kink or over bend hoses or use hoses to pull equipment.
•
Keep children and animals away from work area.
•
Comply with all applicable safety regulations.
4 312888D
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.
Isocyanate Hazard
•
Keep the ISO lube pump reservoir (if installed) filled
with Graco Throat Seal Liquid (TSL), Part 206995.
The lubricant creates a barrier between the ISO and
the atmosphere.
•
Use moisture-proof hoses specifically designed for
ISO, such as those supplied with your system.
•
Never use reclaimed solvents, which may contain
moisture. Always keep solvent containers closed
when not in use.
•
Never use solvent on one side if it has been contaminated from the other side.
•
Always lubricate threaded parts with ISO pump oil
or grease when reassembling.
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.
Material Self-ignition
Some materials may become self-igniting if applied
too thickly. Read material manufacturer’s warnings
and material MSDS.
Moisture Sensitivity of Isocyanates
Isocyanates (ISO) are catalysts used in two component
foam and polyurea coatings. ISO will react with moisture
(such as humidity) to form small, hard, abrasive crystals,
which become suspended in the fluid. Eventually a film
will form on the surface and the ISO will begin to gel,
increasing in viscosity. If used, this partially cured ISO
will reduce performance and the life of all wetted parts.
The amount of film formation and rate of crystallization varies depending on the blend of ISO, the
humidity, and the temperature.
To prevent exposing ISO to moisture:
•
Always use a sealed container with a desiccant
dryer in the vent, or a nitrogen atmosphere. Never
store ISO in an open container.
Keep Components A and B Separate
CAUTION
To prevent cross-contamination of the equipment’s
wetted parts, never interchange component A (isocyanate) and component B (resin) parts.
Foam Resins with 245 fa Blowing Agents
New foam blowing agents will froth at temperatures
above 90°F (33°C) when not under pressure, especially
if agitated. To reduce frothing, minimize preheating in a
circulation system.
Changing Materials
•
When changing materials, flush the equipment multiple times to ensure it is thoroughly clean.
•
Always clean the fluid inlet strainers after flushing.
•
Check with your material manufacturer for chemical
compatibility.
•
Most materials use ISO on the A side, but some use
ISO on the B side.
•
Epoxies often have amines on the B (hardener)
side. Polyureas often have amines on the B (resin)
side.
312888D 5
Components
Components
F
Overall View
Gun Block
E
B
C
D
A
Q
P
N
M
L
R
S
T
W
X
G
U
V
AA
K
H
Key:
A Manual Valves
B Gun Block
C Coupling Block
D Trigger
E Valving Rod
F Piston Rod
G Safety Stop
H Pattern Control Tip
J Front Packing
KO-ring
L Front Impinger
M Throat
N Rear Impinger
P Screen Screw Mounting Screw
Q R-Port Closure Screw
Z
AB
AE
AC
J
AD
R Gun Block
S Resin Seal Retainer
TSpacer
U Resin Seal Screw
VO-ring
WResin Packing
X A-Port Closure Screw
Y Gun Block Screen
Z Gun Block Screen Screw
AA Screen Screw Seal
AB Snap Ring
AC A-Check Valve
AD Coupling Block Gaskets
AE R-Check Valve
Y
6 312888D
Operation Basics
To prevent accidental gun operation, always disconnect air supply before servicing gun or anytime gun is
not in use.
Grounding
Operation Basics
Safety Stop
The gun has a two-position safety stop. The SERVICE
(CLOSED) position permits both material inlet ports to
remain closed when gun is triggered.
Safety Stop
Check your local electrical code and your proportioner
manual for detailed grounding instructions.
Ground the spray gun through connection to a
Graco-approved grounded fluid supply hose.
Engage Safety Stop
To engage safety stop, push in and turn clockwise to
CLOSED (rear detent) position, then release.
Disengage Safety Stop
To disengage safety stop, push in and turn counterclockwise to place in OPEN (forward detent) position, then
release.
312888D 7
Operation Basics
Air Hose Connection
Connect Air Hoses
Pull back sleeve of female fitting, insert male fitting and
slide sleeve forward to secure connection.
Disconnect Air Hoses
Pull back sleeve of female fitting and pull out male fitting.
Pull Sleeve
Coupling Block
Chemical hoses are joined to gun block by coupling
block to ease installation and removal of gun.
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.
Manual Valves
Removal and Installation
Manual Valves
Triggering gun with manual valves closed may
cause crossover if gun ports contain residual chemical.
To prevent release of pressurized chemicals, never
open manual valves unless coupling block is secured
to gun or exit port is directed into flush pail.
To prevent release of pressurized chemicals, close
both manual valves before removing coupling block.
Remove Coupling Block
1. Set safety stop to SERVICE (CLOSED).
2. Disconnect air hose.
3. Close both manual valves.
4. Remove coupling block mounting screw.
5. Separate coupling block from gun.
6. Wipe mating surfaces of gun block and coupling
block to remove residual chemical.
8 312888D
7. Cover exposed openings with grease.
Coupling
Block
Install Coupling Block
Replace nicked, damaged, or worn coupling block gaskets.
1. With gaskets in place, fit coupling block to gun
block.
Operation Basics
2. Insert coupling block mounting screw and use
5/16 in. nut driver to tighten to gun block.
312888D 9
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.
3. Adjust valving rod travel to initial setting. See Valv-
ing Rod and Resilient Sleeve, page 17.
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.
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.
10 312888D
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