Graco GUSMER D Series User manual

311320K
Instructions
Model D Spray Gun EN
For use with non-flammable polyurethane foams. For professional use only.
1000 psi (7 MPa, 70 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this
manual before using the equipment.
Save these instructions.

Models
2311320K
Contents
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Important Isocyanate (ISO) Information . . . . . . . . . 6
Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . 6
Material Self-Ignition . . . . . . . . . . . . . . . . . . . . . . 7
Keep Components A and B Separate . . . . . . . . . 7
Moisture Sensitivity of Isocyanates . . . . . . . . . . . 7
Foam Resins with 245 fa Blowing Agents . . . . . . 7
Changing Materials . . . . . . . . . . . . . . . . . . . . . . . 7
Component Identification . . . . . . . . . . . . . . . . . . . . 8
Model D Spray Gun . . . . . . . . . . . . . . . . . . . . . . . 8
Fluid Head Components . . . . . . . . . . . . . . . . . . . 9
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Coupling Block . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Air Hose Connection . . . . . . . . . . . . . . . . . . . . . 11
Valving Rod Adjustment Screw . . . . . . . . . . . . . 11
Air Cap Adjustment Valve . . . . . . . . . . . . . . . . . 11
Felt Wiper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Initial Set Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Daily Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 13
Pressure Relief Procedure . . . . . . . . . . . . . . . . . 13
Spray Pattern Adjustment . . . . . . . . . . . . . . . . . . . 14
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Gun Service Kits. . . . . . . . . . . . . . . . . . . . . . . . . 16
Clean Spray Gun . . . . . . . . . . . . . . . . . . . . . . . . 16
Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Remove and Service Filter Screen. . . . . . . . . . . 17
Clean Injection Slots. . . . . . . . . . . . . . . . . . . . . . 17
Adjust Valving Rod . . . . . . . . . . . . . . . . . . . . . . . 18
Remove Fluid Head Component . . . . . . . . . . . . 19
Install Fluid Head Component . . . . . . . . . . . . . . 21
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Model D Spray Gun Assembly . . . . . . . . . . . . . . 22
Air Cylinder Assembly . . . . . . . . . . . . . . . . . . . . 25
Coupling Block Assembly . . . . . . . . . . . . . . . . . . 26
Technical Specifications . . . . . . . . . . . . . . . . . . . . 27
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 28
Models
Part Description Mix Module
295530 D-55 296597
295531 D-55-RECIRC 296597
295532 D-62 296598
295533 D-70 296599

Warnings
311320K 3
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 symbols refer to procedure-specific risks.
When these symbols appear in the body of this manual or on warning labels, refer back to these Warnings.
Product-specific hazard symbols and warnings not covered in this section may appear throughout the body of this
manual where applicable.
WARNING
PERSONAL PROTECTIVE EQUIPMENT
Always wear appropriate personal protective equipment and cover all skin when spraying, servicing
equipment, or when in the work area. Protective equipment helps prevent serious injury, including
long-term exposure; inhalation of toxic fumes, mists or vapors; allergic reaction; burns; eye injury and
hearing loss. This protective equipment includes but is not limited to:
• A properly fitting respirator, which may include a supplied-air respirator, chemically impermeable
gloves, protective clothing and foot coverings as recommended by the fluid manufacturer and local
regulatory authority.
• Protective eyewear and 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 Safety Data Sheets (SDSs) for handling instructions and to know the specific hazards of the
fluids you are using, including the effects of long-term exposure.
• When spraying, servicing equipment, or when in the work area, always keep work area
well-ventilated and always wear appropriate personal protective equipment. See Personal
Protective Equipment warnings in this manual.
• 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 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.
• Follow the Pressure Relief Procedure when you stop spraying and before cleaning, checking, or
servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses and couplings daily. Replace worn or damaged parts immediately.

Warnings
4311320K
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. Paint or
solvent flowing through the equipment can cause static sparking. 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 sparking).
• Ground all equipment in the work area. See Grounding instructions.
• Never spray or flush solvent at high pressure.
• 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.
• Use only grounded hoses.
• Hold gun firmly to side of grounded pail when triggering into pail. Do not use pail liners unless they
are anti-static or conductive.
•Stop operation immediately if static sparking occurs or you feel a shock.Do not use equipment until
you identify and correct the problem.
• 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 in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See in all equipment
manuals. Read fluid and solvent manufacturer’s warnings. For complete information about your
material, request Safety Data Sheets (SDSs) from distributor or retailer.
• Turn off all equipment and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’s replacement parts only.
• Do not alter or modify equipment. Alterations or modifications may void agency approvals and create
safety hazards.
• Make sure all equipment is rated and approved for the environment in which you are using it.
• 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.
WARNING

Warnings
311320K 5
PRESSURIZED EQUIPMENT HAZARD
Fluid from the equipment, leaks, or ruptured components can splash in the eyes or on skin and cause
serious injury.
• Follow the Pressure Relief Procedure when you stop spraying/dispensing 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.
BURN HAZARD
Equipment surfaces and fluid that is heated can become very hot during operation. To avoid severe
burns:
• Do not touch hot fluid or equipment.
WARNING

Important Isocyanate (ISO) Information
6311320K
Important Isocyanate (ISO) Information
Isocyanates (ISO) are catalysts used in two component materials.
Isocyanate Conditions
Spraying or dispensing fluids that contain isocyanates creates potentially harmful mists, vapors, and atomized
particulates.
• Read and understand the fluid manufacturer’s warnings and Safety Data Sheets (SDSs) to know specific
hazards and precautions related to isocyanates.
• Use of isocyanates involves potentially hazardous procedures. Do not spray with this equipment unless you
are trained, qualified, and have read and understood the information in this manual and in the fluid
manufacturer’s application instructions and SDSs.
• Use of incorrectly maintained or mis-adjusted equipment may result in improperly cured material, which could
cause off gassing and offensive odors. Equipment must be carefully maintained and adjusted according to
instructions in the manual.
• To prevent inhalation of isocyanate mists, vapors and atomized particulates, everyone in the work area must
wear appropriate respiratory protection. Always wear a properly fitting respirator, which may include a
supplied-air respirator. Ventilate the work area according to instructions in the fluid manufacturer’s SDSs.
• Avoid all skin contact with isocyanates. Everyone in the work area must wear chemically impermeable
gloves, protective clothing and foot coverings as recommended by the fluid manufacturer and local regulatory
authority. Follow all fluid manufacturer recommendations, including those regarding handling of
contaminated clothing. After spraying, wash hands and face before eating or drinking.
• Hazard from exposure to isocyanates continues after spraying. Anyone without appropriate personal
protective equipment must stay out of the work area during application and after application for the time
period specified by the fluid manufacturer. Generally this time period is at least 24 hours.
• Warn others who may enter work area of hazard from exposure to isocyanates. Follow the recommendations
of the fluid manufacturer and local regulatory authority. Posting a placard such as the following outside the
work area is recommended:
TOXIC FUMES
HAZARD
DO NOT ENTER DURING
SPRAY FOAM APPLICATION
OR FOR ___ HOURS AFTER
APPLICATION IS COMPLETE
DO NOT ENTER UNTIL:
DATE:
TIME:
____________
____________

Important Isocyanate (ISO) Information
311320K 7
Material Self-Ignition
Keep Components A and B
Separate
Moisture Sensitivity of
Isocyanates
Exposure to moisture (such as humidity) will cause ISO
to partially cure, forming small, hard, abrasive crystal
that become suspended in the fluid. Eventually a film will
form on the surface and the ISO will begin to gel,
increasing in viscosity.
NOTE: The amount of film formation and rate of
crystallization varies depending on the blend of ISO, the
humidity, and the temperature.
Foam Resins with 245 fa
Blowing Agents
Some 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
Some materials may become self-igniting if applied
too thick. Read material manufacturer’s warnings and
Safety Data Sheets (SDSs).
Cross-contamination can result in cured material in
fluid lines which could cause serious injury or damage
equipment. To prevent cross-contamination:
•Never interchange component A and component
B wetted parts.
• Never use solvent on one side if it has been
contaminated from the other side.
NOTICE
Partially cured ISO will reduce performance and the life
of all wetted parts.
• Always use a sealed container with a desiccant
dryer in the vent, or a nitrogen atmosphere. Never
store ISO in an open container.
• Keep the ISO pump wet cup or reservoir (if
installed) filled with appropriate lubricant. The
lubricant creates a barrier between the ISO and the
atmosphere.
• Use only moisture-proof hoses compatible with
ISO.
• Never use reclaimed solvents, which may contain
moisture. Always keep solvent containers closed
when not in use.
• Always lubricate threaded parts with an appropriate
lubricant when reassembling.
NOTICE
Changing the material types used in your equipment
requires special attention to avoid equipment damage
and downtime.
• 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.
• When changing between epoxies and urethanes or
polyureas, disassemble and clean all fluid
components and change hoses. Epoxies often
have amines on the B (hardener) side. Polyureas
often have amines on the B (resin) side.

Component Identification
8311320K
Component Identification
Model D Spray Gun
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

Component Identification
311320K 9
Fluid Head Components
FIG. 2 Fluid Head 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
10 311320K
Operation
Grounding
Check your local electrical code and proportioner
manual for detailed grounding instructions.
Spray gun / Dispense valve: ground through
connection to a properly grounded fluid hose and pump.
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.
Manual Valves
NOTE: Triggering gun with manual valves closed may
cause crossover if gun ports contain residual chemical.
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
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.
To prevent accidental gun operation, always
disconnect air supply before servicing gun or anytime
gun is not in use.
The equipment must be grounded to reduce the risk
of static sparking. Static sparking can cause fumes to
ignite or explode. Grounding provides an escape wire
for the electric current.
FIG. 3 Coupling Block
Coupling Block
Gaskets
Coupling Block
Mounting Screw
Never open manual valves unless coupling block is
secured to gun or exit port is directed into flush pail.
FIG. 4 Manual Valves
To prevent release of pressurized chemical, close
both manual valves before removing coupling block.
Manual Valves

Operation
311320K 11
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.
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.
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.
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. 5 Air Hose Connection
FIG. 6 Valving Rod Adjustment Screw
Pull Sleeve
Friction Lock
FIG. 7 Air Valve Adjustment
FIG. 8 Felt Wiper
Open
Close

Operation
12 311320K
Clean Felt Wiper
1. Insert nozzle of flush can into holes of felt wiper.
2. Saturate felt with gun cleaner.
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 20.
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 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. (Refer to your proportioning system
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.
NOTE: 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 Daily
Shutdown, page 13, procedure as required.
Daily Start-Up
1. Connect air supply to gun, Air Hose Connection,
page 11.
2. Adjust air cap valve, Air Cap Adjustment Valve,
page 11.
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.
NOTE: 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.
5. Open both manual valves, Manual Valves, page
10.
FIG. 9 Valving Rod (Closed Position)
1/32 in.
Ensure gun is attached to coupling block and air
hose, and the proportioning unit is at desired
temperature and pressure.

Operation
311320K 13
6. Test spray on disposable surface and adjust spray
pattern as needed. (See Spray Pattern
Adjustment procedure, page 14.)
NOTE: 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
Daily Shutdown
NOTE: 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.
1. Follow the Pressure Relief Procedure, page 13.
2. Shut down proportioning unit as required.
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
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, Air Hose Connection,
page 11.
4. If gun is removed from coupling block, follow Clean
Spray Gun, page 16.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection or splashing
fluid, follow the Pressure Relief Procedure when you
stop spraying and before cleaning, checking, or
servicing the equipment.
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 311320K
Spray Pattern Adjustment
1. 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 20.
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 withdrawing valving rod
adjustment screw from retainer case by 1/4-turn
increments in counterclockwise direction.
c. Point of valving is reached when chemical
stream mists as shown in FIG. 11.
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 pattern opens as adjustment
is made (FIG. 12).
This adjustment may create a large mass “bun” of
urethane foam. Very high temperatures 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.
FIG. 10 Valving Rod (Closed Position)
1/32 in.
FIG. 11 Point of Valving
FIG. 12 Opening Spray Pattern

Spray Pattern Adjustment
311320K 15
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 . Moving
the screw out beyond this point may cause the
pattern to split, as shown in FIG. 14.
b. If full-round pattern cannot be achieved, ensure
that material temperature and spray pressure
are correct. If pattern remains closed upon
reaching maximum 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 minimum number of
turns from point of valving, material temperature
is too high. Refer to FIG. 12.
d. After reaching satisfactory spray pattern, note
temperatures at proportioner and hose, and
position of notch on the adjustment screw. As
spraying proceeds, 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.
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 following
items in this order and readjust if necessary:
• Check Valving Rod Adjustment Screw/Sleeve
setting.
• Check hose temperature setting.
• Check primary heater temperature setting.
• Ensure spray pressures between chemicals 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
FIG. 13 Desired Pattern
FIG. 14 Split Pattern
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
16 311320K
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.
For more information about the 1-Quart Gun Service Kit,
see manual your Gun Service Kit manual.
For more information about the 3-Gallon Gun Service
Kit, see manual 311341.
Clean Spray Gun
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
NOTE: Clean Center Line Components using
Gun Service Kit prior to performing any repair
procedures. procedure, page 17.
NOTE: 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.
FIG. 15 1-Quart Gun Service Kit
FIG. 16 3-Gallon Gun Service Kit
Chemicals used while spraying may cause the gun
surface to become hot to touch. Thoroughly flush gun
block with gun cleaner before removing valving rod or
mixing components from gun block. Also allow
chemicals in spray gun to cool before cleaning.

Repair
311320K 17
Repair
NOTE: Clean Center Line Components using Gun
Service Kit prior to performing any repair procedures.
Remove and Service Filter
Screen
1. Perform Pressure Relief Procedure (page 13) and
Clean Spray Gun, page 16.
2. Unthread screen mounting screw. Remove screen
mounting screw and filter screen assembly from gun
block.
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 damaged.
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, page 16.
Clean Injection Slots
1. Perform Pressure Relief Procedure (page 13) and
Clean Spray Gun, page 16.
2. Remove check valves.
3. Inspect check valves to ensure sleeve is secured,
and place check valves in separate 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.
Shut down proportioner and allow chemicals to cool
before performing any repair procedures.
FIG. 17 Filter Screen Assembly
NOTICE
Any remaining material in cavity on down stream side
of screen will clog mixing chamber.
Screen Screw
Seal
Screen
Snap Ring
Mounting Screw
FIG. 18 Check Valves
A-Iso Check Valve
(tall hexhead)
Clean-out Port
(both sides)
R-Resin Check Valve
(short hexhead)

Repair
18 311320K
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, Remove Fluid
Head Component, page 19.
9. Install tall hexhead check valve on Isocyanate side,
and short hexhead on Resin side.
10. Adjust valving rod adjustment screw one turn
clockwise.
Adjust Valving Rod
In closed position, valving rod should extend
approximately 1/32 in. (1 mm) beyond tip of mixing
chamber. If it does not, follow this procedure:
1. Perform Pressure Relief Procedure (page 13) and
Clean Spray Gun, page 16.
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 cylinder.
4. Loosen felt wiper retainer 2-3 turns (DO NOT
REMOVE THE FELT WIPER RETAINER).
5. Remove valving rod. Push back firmly on piston rod
until end of Stop Bar emerges from cylinder
.
6. Loosen stop bar from positioner. Turn positioner to
adjust length of valving rod as required. Retighten
stop bar against positioner.
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 Pattern Adjustment procedure
(page 14).
NOTICE
To prevent damage to chamber, do not release trigger
while cleanout spade is in chamber slot.
FIG. 19 Valving Rod (Closed Position)
FIG. 20 Retainer Case Removal
1/32 in.
Spring Retainer Case
Spring
FIG. 21 Valving Rod Removal
Positioner
Stop Bar

Repair
311320K 19
Remove Fluid Head Component
NOTE: Refer to Figure 2 to view Fluid Head
components.
1. Perform Pressure Relief Procedure (page 13) and
Clean Spray Gun, page 16.
2. Remove air cap by hand, turning it
counterclockwise.
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 cylinder. 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 chamber 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
chamber in gun cleaner.
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.
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
undamaged, replace it.
FIG. 22 Mixing Chamber Removal
Mixing Chamber
Chamber
Knockout
Tool
NOTICE
Matching tapers on mixing chamber and center hole in
gun block are machined to an exact fit to hold
chambers in place and create a leak-proof seal. When
handling or cleaning these parts be careful not to
damage finish. Do not use metal tools to clean these
parts.
FIG. 23 Check Valves
Screw
Sleeve
Ball and Spring

Repair
20 311320K
b. Use check valve cleanout drill to clean inside of
closure screw. Insert the flattened 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 damage. 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,
compressing 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 relative 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 pressing tool into gun block, turn
it clockwise several times. Withdraw tool from
gun block; sleeve should slide out with tool.
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
chamber. Do not tighten. If not installing to gun
block, store assembly in plastic vial with
corresponding cleanout spade.
FIG. 24 Sleeve Removal Block
Check Valve Sleeve
Insert Check Valve