GUSMER GX-8 User manual

"Teamwork & Communication"
Model GX-8
Spray Gun
Operating Manual
32943-1
April 21, 1999
Issue 1
GUSMER CORPORATION ®
A Subsidiary of Gusmer Machinery Group, Inc.
One Gusmer Drive
Lakewood, New Jersey, USA 08701-8055
Toll Free 1-800-367-4767 (USA & Canada)
Phone: [phone]
Fax: [phone]
Copyright 1999, GUSMER CORPORATION ®
http://www.gusmer.com
NOTICE: This manual contains important information for your GUSMER equipment. Read and retain for future reference.

Model GX-8 Spray Gun
232943-1, Issue 1
CONTENTS
LIST OF FIGURES..........................................................................................................3
WARRANTY ....................................................................................................................4
GENERAL SAFETY INFORMATION..........................................................................5
ACCEPTABLE EQUIPMENT USES.......................................................................................5
OPERATIONAL SAFETY PROCEDURES...............................................................................6
DESCRIPTION.................................................................................................................7
KEY FEATURES................................................................................................................7
MAJOR COMPONENTS......................................................................................................9
EQUIPMENT SUPPLIED....................................................................................................10
GUN SERVICE KITS........................................................................................................11
OPERATION..................................................................................................................12
SAFETY POSITION OF GUN .............................................................................................12
MANUAL VALVES ..........................................................................................................12
AIR LINE CONFIGURATION.............................................................................................13
START-UP......................................................................................................................13
SHUTDOWN....................................................................................................................14
CLEANING PROCEDURE...........................................................................................15
SERVICING PROCEDURES........................................................................................17
SCREEN SCREW REMOVAL AND SERVICE PROCEDURE .................................................17
CENTERLINE COMPONENT REMOVAL ............................................................................18
CENTERLINE COMPONENT INSTALLATION .....................................................................20
VALVING ROD ADJUSTMENT .........................................................................................21
AIR PISTON O-RING AND CUP SEAL REPLACEMENT ......................................................23
END CAP O-RING AND CUP SEAL REPLACEMENT..........................................................25
TRIGGER VALVE O-RING REPLACEMENT.......................................................................27
APPENDIX......................................................................................................................29
SPECIFICATIONS.............................................................................................................29
INSTRUCTION MANUAL DISCREPANCY REPORT............................................31

Operating Manual Contents
4/21/99 3
LIST OF FIGURES
FIGURE 1. MIXING MODULE..............................................................................................8
FIGURE 2. MAJOR COMPONENTS .......................................................................................9
FIGURE 3. CENTERLINE COMPONENTS...............................................................................9
FIGURE 4. STANDARD TOOL KIT ......................................................................................10
FIGURE 5. 1 QUART GUN SERVICE KIT (P/N OP205).......................................................11
FIGURE 6. 3 GALLON GUN SERVICE KIT (P/N OP206).....................................................11
FIGURE 7. ENGAGE THE SAFETY STOP..............................................................................12
FIGURE 8. DISENGAGE THE SAFETY STOP ........................................................................12
FIGURE 9. MANUAL VALVES ............................................................................................12
FIGURE 10. CENTERLINE COMPONENT REMOVAL..............................................................18
FIGURE 11. CENTERLINE COMPONENT INSTALLATION .......................................................20
FIGURE 12. PCD SPACING..............................................................................................21
FIGURE 13. VALVING ROD ADJUSTMENTS ........................................................................22
FIGURE 14. END CAP/SAFETY STOP ASSEMBLY AND PISTON ASSEMBLY REMOVAL.............24
FIGURE 15. END CAP/SAFETY STOP ASSEMBLY REMOVAL.................................................26
FIGURE 16. TRIGGER/AIR VALVE ASSEMBLY.....................................................................27

Model GX-8 Spray Gun
432943-1, Issue 1
WARRANTY
Gusmer Corporation (Gusmer) provides a limited warranty to the original purchaser (Customer) of
Gusmer manufactured parts and equipment (Product) against any defects in material or
workmanship for a period of one year from the date of shipment from Gusmer facilities.
In the event Product is suspected to be defective in material or workmanship, it must be returned to
Gusmer, freight prepaid. If Product is found to be defective in material or workmanship, as
determined solely by Gusmer, Gusmer will issue full credit to Customer for the freight charges
incurred in returning the defective Product, and either credit will be issued for the replacement cost
of the Product or a replacement part will be forwarded no-charge, freight prepaid to Customer.
This warranty shall not apply to Product Gusmer finds to be defective resulting from: installation,
use, maintenance, or procedures not accomplished in accordance with our instructions; normal
wear; accident; negligence; alterations not authorized in writing by Gusmer; use of “look alike”
parts not manufactured or supplied by Gusmer; or Product used in conjunction with any other
manufacturer's pumping or proportioning equipment. Further, the terms and conditions of this
warranty shall not apply to services or repairs made to Product by any third party not authorized in
writing by Gusmer. For such Product, a written estimate will be submitted to Customer at a
nominal service charge, itemizing the cost for repair. Disposition of Product will be done in
accordance with the terms stated on the written estimate.
The warranty provisions applied to product that are not manufactured by Gusmer will be solely in
accordance with the warranty provided by the original manufacturer of the product.
GUSMER MAKES NO WARRANTY WHATSOEVER AS TO THE MERCHANTABILITY OF,
OR SUITABILITY FOR, ITS PRODUCT TO PERFORM ANY PARTICULAR PURPOSE.
CREDIT FOR, OR REPLACEMENT OF, PRODUCT DEFECTIVE IN MATERIAL OR
WORKMANSHIP SHALL CONSTITUTE COMPLETE FULFILLMENT OF GUSMER
OBLIGATIONS TO CUSTOMER. NO OTHER WARRANTY, EXPRESSED OR IMPLIED ON
ANY PRODUCT IT MANUFACTURES AND/OR SELLS, WILL BE RECOGNIZED BY
GUSMER UNLESS SAID WARRANTY IS IN WRITING AND APPROVED BY AN OFFICER
OF GUSMER.
Under no circumstances shall Gusmer be liable for loss of prospective or speculative profits, or
special indirect, incidental or consequential damages. Further, Gusmer shall have no liability for
any expenses including, but not limited to personal injury or property damage resulting from failure
of performance of the product, use of the product, or application of the material dispensed through
the product. Any information provided by Gusmer that is based on data received from a third
source, or that pertains to product not manufactured by Gusmer, while believed to be accurate and
reliable, is presented without guarantee, warranty, or responsibility of any kind, expressed or
implied.
Gusmer through the sale, lease, or rental of Product in no way expresses or implies a license for the
use of, nor encourages the infringement of any patents or licenses.
To insure proper validation of your warranty, please complete the warranty card and return it to
Gusmer within two weeks of receipt of equipment.
Revised 11/12/98

Operating Manual General Safety Information
4/21/99 5
GENERAL SAFETY INFORMATION
It is necessary to understand and follow the instructions in this manual to insure proper
and safe operation of the equipment.
As with most mechanical equipment, certain safety precautions must be taken when the
equipment discussed in this manual is operated or serviced. Severe bodily injury or
damage to equipment and property may result if the instructions and precautions listed
throughout this manual are not followed.
Needless to say, sufficient guidelines cannot be developed to eliminate the need for good
common sense in the use and servicing of this equipment, and in the use and application
of the products, this equipment has been designed to process. Users of this equipment
must therefore, make their own determination as to the suitability of the information
contained in this manual to their specific operation and requirements. There should be no
assumption made that the safety measures and instructions contained herein are all-
inclusive, and that other safety measures may not be required for specific use or
application.
The following safety guidelines are generally applicable to the safe and efficient use of
the equipment.
Acceptable Equipment Uses
The equipment is designed for the dispensing of polyurethane foams, two-component
coating systems, and some two-component epoxy systems, specifically polyureas. Under
no circumstances should any acid or corrosive chemicals be used in the unit. Consult
GUSMER if there is any doubt about the compatibility of the chemical system to be used
in this equipment.
Any use of this equipment other than as indicated above constitutes misuse unless express
written approval is obtained from GUSMER.

Model GX-8 Spray Gun
632943-1, Issue 1
Operational Safety Procedures
This safety information will not be repeated in the text of this manual. The symbols
pertaining to this information will appear where appropriate to alert the operator to
potential hazards.
Solvents and Chemicals
WARNING: THE SOVENTS AND CHEMICAL USED WITH THIS EQUIPMENT EXPOSE THE
OPERATOR TO CERTAIN HAZARDS.ADEQUATE PERSONAL PROTECTIVE MEASURES MUST
BETAKEN SO AS TO AVOID EXCEEDING THE THRESHOLD LIMIT VALUE (TLV) OF THE
PRODUCTS BEING USED,AS ESTABLISHED BY THE OCCUPATIONAL SAFETY AND HEALTH
ADMINISTRATION (OSHA) OR OTHER QUALIFIED AGENCY.INFORMATION CONCERNING
PERSONAL PROTECTION AND PROPER HANDLING FROM THE SUPPLIER OF SUCH CHEMICALS.
High Voltage
WARNING: TO PREVENT SERIOUS BODILY INJURY FROM ELECTRICAL SHOCK,NEVER OPEN
THE ELECTRIC CONSOLES OR OTHERWISE SERVICE THIS EQUIPMENT AND/OR EQUIPMENT USED
WITH IT BEFORE SWITCHING OFF THE MAIN POWER DISCONNECT AND INTERRUPTING SUPPLY
VOLTAGE AT THE SOURCE.THE ELECTRICAL SERVICE MUST BE INSTALLED AND MAINTAINED BY
A QUALIFIED ELECTRICIAN.
High Pressure
WARNING: THIS EQUIPMENT HAS OR IS USED WITH EQUIPMENT THAT HAS HYDRAULIC
COMPONENTS CAPABLE OF PRODUCING UP TO 3500 PSI.TO AVOID SERIOUS BODILY INJURY
FROM HYDRAULIC INJECTION OF FLUID,NEVER OPEN ANY HYDRAULIC CONNECTIONS OR
SERVICE HYDRAULIC COMPONENTS WITHOUT BLEEDING ALL PRESSURES TO ZERO.
Personal Protective
Equipment
WARNING: TO AVOID SERIOUS BODILY INJURY,PROPER PROTECTIVE GEAR MUST BE WORN
WHEN OPERATING,SERVICING,OR BEING PRESENT IN THE OPERATIONAL ZONE OF THIS
EQUIPMENT.THIS INCLUDES,BUT IS NOT LIMITED TO,EYE AND FACE PROTECTION,GLOVES,
SAFETY SHOES,AND RESPIRATORY EQUIPMENT AS REQUIRED.
High Temperature
WARNING: THIS EQUIPMENT HAS OR IS USED WITH EQUIPMENT THAT HAS HIGH
TEMPERATURE COMPONENTS SUCH AS PRIMARY HEATERS AND HEATED HOSES.TO PREVENT
SERIOUS BODILY INJURY FROM HOT FLUID OR HOT METAL,NEVER ATTEMPT TO SERVICE THE
EQUIPMENT BEFORE ALLOWING IT TO COOL.
Warning
WARNING:F
AILURE TO READ AND FOLLOW THIS SAFETY INFORMATION MAY RESULT IN
PERSONAL INJURY AND/OR DAMAGE TO THE EQUIPMENT FROM ONE OR MORE OF THE ABOVE
LISTED HAZARDS

Operating Manual Description
4/21/99 7
DESCRIPTION
Key Features
The design and development of the Gusmer Model GX-8 Spray Gun represents the next
step in the evolution of spray coating technology that Gusmer originated over 35 years
ago. We believe the GX-8 Spray Gun is the only mechanical purge gun in the world that
allows the spraying of polyureas and hybrids at outputs in the 1-2 pound per minute
range. Its lower output, lighter weight, fewer parts, and reduced air consumption are just
a few of its innovative enhancements. Yet, the GX-8 maintains many of the unique
design characteristics of its direct predecessor, the GX-7. These unique characteristics
include mechanical purge, a variety of durable mixing modules, interchangeable Pattern
Control Discs (PCD), and Gusmer quality.
The GX-8 design has successfully combined the proven concepts of other Gusmer
mechanical purge, direct impingement guns with exciting new enhancements that provide
a completely new gun that delivers:
• Unmatched low output capabilities
• Smaller gun dimensions with a 37% reduction in weight
• Increased maneuverability specifically for open mold applications
• Easy operation
• Less expensive operation
The gun is available with a variety of PCD options designed to meet most applications
that require the spraying of fast chemical systems at low outputs. Both your authorized
Gusmer Distributor and Gusmer Sales Engineers are available to help determine what
configurations are best for your specific application. Please contact either for additional
information.
The GX-8 is a combination of new concepts and existing Gusmer spray gun technology.
For example, the mixing module that is contained in the GX-8 is similar in function to the
GX-7 mixing module. However, it is very different in its final design. The module’s
modified geometry supports the mixing requirements of the extremely fast chemistries
found in polyureas and hybrid polyurethanes/polyurea. This coupled with a smaller
mechanical purge valving rod and smaller PCD insure proper mixing and timely delivery
of mixed product to the work surface. The PCD now comes standard with Gusmer’s
proprietary “gold tip” finish. This space age coating improves the non-sticking
characteristics of the tip, while simultaneously improving its durability. With improved
tip durability maintaining the spray pattern, whether round or fan shaped, for longer
periods is possible. This equates into longer tip life for the user.
The Mixing Module is the only part that requires routine replacement to insure proper gun
operation. This inexpensive plastic component will wear out through normal use. The
module incorporates a small alignment pin, which insures proper chemical port alignment
during insertion into the Gun Block. The Mixing Module is a precision-machined
component made of a proprietary engineering thermoplastic. It is cleaned using an air
pressurized Gun Cleaning Kit. However, even if irregularly serviced it can still be
cleaned using the appropriate drill bit. The Valving Rod is precision ground and made
from hardened tool steel. It is designed for long life and under normal use, will not
require routine replacement.

Model GX-8 Spray Gun
832943-1, Issue 1
VALVING ROD
ASSEMBLY
PATTERN
CONTROL
DISC (PCD)
MIXING
MODULE
Figure 1. Mixing Module
The GX-8 has been designed for low output spraying performance, durability, reliability,
and serviceability. In order to enable the gun to dispense extremely low levels of
chemical, the Mixing Module has precision-machined chemical ports incorporated into it.
To protect these ports from clogging extremely fine screen mesh filters are used. Special
material coatings and material finishing techniques were also incorporated into the design.
A thorough understanding of this manual is essential to completely insure that this gun
provides the best service possible. In addition, the experience gained through daily use of
the gun will sharpen your operational and service skills. Functional problems can be
significantly reduced by following the techniques and service recommendations described
in this manual.
Gusmer and our Authorized Distributors have experienced, highly qualified, technical
representatives who are always available to help if a problem does occur. In most cases, a
simple telephone call to our technical representatives will provide you with a solution to
your problem. Be sure to take advantage of their experience and expertise.
IMPORTANT: Substitution of parts not designed manufactured, or recommended by
Gusmer could result in harm to the user and/or damage to the GX-8 Gun. Any
alterations to or substitutions for Gusmer parts will void the warranty provisions set
forth elsewhere in this manual

Operating Manual Description
4/21/99 9
Major Components
In keeping with the need to gain a complete and thorough understanding of the
equipment, please take time to become familiar with the major components of the GX-8
Gun (Figure 2) and its Centerline Components (Figure 3). This will be helpful later when
these items are covered in the manual.
Safety Stop
Adjustment
Air Cap Air
Valve
Piston Rod
Jam Nut
Valving Rod
Trigger
Manual Valves
Gun Block
Assembly
Air Cap
Coupling Block
Figure 2. Major Components
NOTE:
Both Round and Fan Mixing
Modules are available. The
Round Module provides a
round spray pattern and is
identified by a groove in its
cylindrical body. The Fan
Module provides a fan spray
pattern and is identified by its
smooth cylindrical body.
Figure 3. Centerline Components

Model GX-8 Spray Gun
10 32943-1, Issue 1
Equipment Supplied
The Standard Tool Kit includes the following tools for use in servicing the GX-8.
Figure 4. Standard Tool Kit
1. 10” Adjustable Wrench (P/N 909A)
2. 6” Adjustable Wrench (P/N 0908)
3. 3/8” x 5/16” Open End Wrench
(P/N 1982A)
4. 1/2” Combination Wrench (P/N 1986)
5. 5/16” Spintite (P/N 0904A)
6. Retaining Ring 45°
°°
°Pliers (P/N 32982)
7. 6” Pliers (P/N 0906)
8. 9/64” Ball Point Hex Key
(P/N 0902-9/64)
9. 5/32” Hex Key (P/N 0902-5/32)
10. 3/16” Hex Key (P/N 0902-3/16)
11. 5/64” Hex Key (P/N 0902-5/64)
12. Check Valve Removal/Cleaning Tool
(P/N 1948)
13. #80 Clean Out Drill (.0135 Dia.)
(P/N 0941-45)
14. #68 Clean Out Drill (.031 Dia.)
(P/N 0941-22)
15. #60 Clean Out Drill (.040 Dia.)
(P/N 0941-29)
16. 1/8” Dia. Clean Out Drill
(P/N 0927-1/8)
17. 21/64” Dia. Clean Out Drill
(P/N 0927-21/64)
18. Pin Vise W/Collets (P/N 6902A)
19. Brush (P/N 1945)
20. Flush Can (P/N 0919A)
21. Lubriplate Grease
(P/N 0553-2) Not Shown

Operating Manual Description
4/21/99 11
Gun Service Kits
Cleaning the GX-8 with the 1 Quart Gun Service Kit (P/N OP205) or the 3 Gallon Gun
Service Kit (P/N OP206) is essential to the proper operation of the GX-8. Both kits are
available separately.
NOTE:
For more information
concerning the 1 Quart Gun
Service Kit consult the Parts
Identification Manual
(P/N OP205-ID).
Figure 5. 1 Quart Gun Service Kit (P/N OP205).
NOTE:
For more information
concerning the optional,
3 Gallon Gun Service Kit (P/N
OP206) consult the Parts
Identification Manual
(P/N OP206-ID).
Figure 6. 3 Gallon Gun Service Kit (P/N OP206)

Model GX-8 Spray Gun
12 32943-1, Issue 1
OPERATION
WARNING: NEVER POINT THE GUN AT OR NEAR OTHER PERSONNEL OR PLACE ANY PART OF
THE BODY IN THE PATH OF THE MATERIAL SPRAY AND DO NOT AT ANY TIME LOOK INTO THE
DISPENSING END OF THE GUN.WHEN THE GUN IS NOT BEING USED,ALWAYS SET THE REAR
STOP TO THE SAFETY OR SERVICE POSITION,AND CLOSE BOTH MANUAL VALVES.DOTHISTO
AVOID THE POSSIBILITY OF PROPERTY DAMAGE OR BODILY INJURY FROM THE ACCIDENTAL
OPERATION OF THE GUN.
Safety Position of Gun
The GX-8 has a two position Safety Stop. When engaged, it prevents accidental
triggering of the gun during servicing or down time. When disengaged, it allows the gun
to dispense.
1. ENGAGE THE SAFETY STOP-
Push in and turn the Safety Stop knob
clockwise to place the gun in the
Safety detented position.
IMPORTANT: Always engage the
Safety Stop when the gun is not in use.
Figure 7. Engage the Safety Stop
2. DISENGAGE THE SAFETY STOP-
Push in and turn the Safety Stop knob
counterclockwise to place the gun in
the Open detented position.
Figure 8. Disengage the Safety Stop
Manual valves
TOOLS REQUIRED
• 5/16” Spintite (P/N 0904A)
The GX-8 Coupling Block is equipped with
two Manual Valves which control the flow
of each chemical component to the gun.
1. OPEN BOTH MANUAL VALVES-
Using the 5/16” Spintite, turn each
Manual Valve fully counterclockwise.
NOTE:
Unnecessary triggering of the gun
with the manual valves closed
may cause crossover if there is
any residual chemical in the gun
ports.
2. CLOSE BOTH MANUAL VALVES-
Using the 5/16” Spintite, turn each
Manual Valve fully clockwise. Figure 9. Manual Valves

Operating Manual Operation
4/21/99 13
IMPORTANT: To avoid accidental gun operation determine that the coupling block
manual valves have been closed before attempting to service the gun, or any time the
gun is not in use.
Air Line Configuration
TOOLS REQUIRED
• 3/16” Hex Key (P/N 0902-3/16)
• 6” Adjustable Wrench (P/N 0908)
The GX-8 air line connection can be configured in two different ways. The standard
configuration has the air connection at the base of the handle. The optional configuration
has the air connection at the rear of the gun. To change to the optional configuration
proceed as follows:
1. REMOVE THE 4“ LONG PIPE NIPPLE- Using the 6” Adjustable Wrench, remove
the 4“ long pipe nipple from the base of the Gun.
2. REMOVE THE 1/8” PIPE PLUG- Using the 3/16” Hex Key, remove the 1/8” pipe
plug from the rear of the gun.
3. INSTALL THE 1/8” PIPE PLUG- Using the 3/16” Hex Key, install the 1/8” pipe
plug in the location previously occupied by the 4“ long pipe nipple.
4. INSTALL THE (OPTIONAL) SUPPLIED BRASS 1/8” NIPPLE- Using the 6”
Adjustable Wrench, install the supplied brass 1/8” nipple in the location previously
occupied by the 1/8” pipe plug.
Start-Up
TOOLS REQUIRED
• 5/16” Spintite (P/N 0904A)
IMPORTANT: Before attempting the following procedures, make sure the gun is
attached to the coupling block and air hoses, the proportioning unit is at the desired
temperature and pressure, and the system is ready for operation.
1. ADJUST THE AIR VALVE AIR ADJUSTMENT CAP CONTROL- The Knurled
knob on the Air Cylinder controls the amount of air that passes over the PCD. This
flow of air helps keep the PCD free of sprayed chemical. Too much air can
adversely effect spray pattern shape and create undesirable amounts of over-spray.
However, the airflow can be used to modify the spray pattern. Experiment to
determine what works best for the application.
Turn the knob Counter clockwise to open the valve and clockwise to close it.
NOTE:
If the GX-8 is shipped from the
factory without the Mixing Module
andPCDinstalledtheValvingRod
will require adjustment. See the
Valving Rod Adjustment section of
the manual.
2. OPEN BOTH MANUAL VALVES- Using the 5/16” Spintite, turn each valve fully
counterclockwise.
3. DISENGAGE THE SAFETY STOP- Push in and turn the Safety Stop knob
counterclockwise to place the gun in the Open detented position.
4. TEST SPRAY OFF TARGET

Model GX-8 Spray Gun
14 32943-1, Issue 1
Shutdown
TOOLS REQUIRED
• 5/16” Spintite (P/N 0904A)
IMPORTANT: Follow this procedure whenever the gun is out of service for any
length of time. For mid/end of day, service see the Cleaning Procedure section of this
manual.
1. ENGAGE THE SAFETY STOP- Push in and turn the Safety Stop knob clockwise to
place the gun in the Safety detented position.
2. CLOSE BOTH MANUAL VALVES- Using the 5/16” Spintite, turn each valve fully
clockwise.
3. CLEAN AS REQUIRED- See the Cleaning Procedure section of the manual.
NOTE:
Disassembling the gun daily for
cleaning is not recommended if it
has been operating properly.
However, experience will
determine whether disassembly is
necessary
IMPORTANT: As an additional safety precaution, the GX-8 air line has quick
disconnect air coupling. Disconnect the air line when transporting the gun with the
chemical hoses connected

Operating Manual Cleaning Procedure
4/21/99 15
CLEANING PROCEDURE
TOOLS REQUIRED
• 5/16” Spintite (P/N 0904A)
• 1 Quart Gun Service Kit (P/N OP205)
• Flush Can (P/N 0919A)
The Gun Block must be thoroughly cleaned with Gun Cleaner before removing the
Valving Rod or mixing components from the Gun Block. In this way, the residue left
from the two components will be completely diluted with Gun Cleaner and will not react
with one another when the Gun Block components are removed.
This procedure makes use of the 1 Quart Gun Service Kit (P/N OP205) and is the
recommended procedure for several reasons:
1) The cleaning is more efficient and uses less Gun Cleaner.
2) The gun does not have to be disassembled.
3) It can be used as a quick and efficient end of day procedure.
The 3 Gallon Gun Service Kit (P/N OP206) is also available for cleaning the GX-8.
WARNING: PROPERLY GROUND ALL EQUIPMENT INVOLVED IN THE CLEANING OPERATION
TO AVOID STATIC SPARKING WHICH COULD RESULT IN FIRE OR EXPLOSION.DO NOT CLEAN ON
OR NEAR FOAMED OR COATED SURFACES.
WARNING: WHEN SERVICING OR OPERATING THE GX-8, SUFFICIENT PROTECTIVE CLOTHING
MUST BE WORN TO PREVENT PROLONGED SKIN CONTACT WITH THE CHEMICALS OR SOLVENTS
USED IN OR WITH THE GUN.
ALWAYS WEAR APPROVED SAFETY GLASSES OR GOGGLES,GLOVES,AND RESPIRATORY
EQUIPMENT WHEN SERVICING OR OPERATING THE GX-8.
1. CLOSE BOTH MANUAL VALVES- Using the 5/16” Spintite, turn each Manual
Valve fully clockwise.
2. ENGAGE THE SAFETY STOP- Push in and turn the Safety Stop knob clockwise to
place the gun in the Safety detented position.
3. REMOVE THE GUN FROM THE COUPLING BLOCK- Using the 5/16" Spintite;
remove the Coupling Block Mounting Screw. Separate the gun from the Coupling
Block. Using a rag soaked with Gun Cleaner wipe clean the face of the Coupling
Block to prevent material build-up.
4. ATTACH THE SERVICE BLOCK OF THE GUN SERVICE KIT TO THE GUN–
Using the 5/16” Spintite; fasten the Service Block to the gun. Pressurize the
container to 100 psi.

Model GX-8 Spray Gun
16 32943-1, Issue 1
5. CLEAN THE GUN
NOTE:
Opening one manual valve at a
time will allow flushing of
individual chemicals. This is
useful when flushing high
viscosity materials and insures
maximum effectiveness in purging
the gun of chemical.
a) Open either one of the Manual Valves on the Service Block
b) Disengage the Safety Stop by pushing in and turning the Safety Stop
Knob counterclockwise to place the gun in the Open detented position.
c) Trigger the Gun Service Kit and the Gun simultaneously catching the
Gun Cleaner in an appropriate container.
(A fine, unobstructed mist of cleaner should exit the Tip.)
d) Release both triggers and close the Manual Valves on the Service
Block.
e) Repeat the Procedure for the other side of the Gun.
6. REMOVE THE SERVICE BLOCK OF THE GUN SERVICE KIT FROM THE
GUN– Using the 5/16” Spintite; disconnect the Service Block from the gun.
7. CLEAN SCREENS AND SCREEN SCREW- Using the Flush Can, flush out the
Screens and the Screen Screw Cavities completely.SeetheScreen Screw Service
Procedure section of this manual
Important: At this time it is a good idea to inspect the Air Cap, PCD, Module, and
Gun Block for build up of material and clean them as required.

Operating Manual Servicing Procedures
4/21/99 17
SERVICING PROCEDURES
Screen Screw Removal And Service Procedure
TOOLS REQUIRED
• 3/8” x 5/16” Open End Wrench (P/N 1982A)
• 1/8” Dia. (P/N 0927-1/8) Clean Out Drill
• 21/64” Dia. (P/N 0927-21/64) Clean Out Drill
• Pin Vise W/Collets (P/N 6902A)
• Flush Can (P/N 0919A)
WARNING: BE SURE TO CLEAN THE “CENTER LINE COMPONENTS”USING THE GUN SERVICE
KIT PRIOR TO REMOVAL FOR SERVICING AS THEY ARE EXPOSED TO THE CHEMICAL.SEE THE
CLEANING PROCEDURES SECTION OF THIS MANUAL.
1. REMOVE THE SCREEN SCREW ASSEMBLY- Using the 3/8” x 5/16” Open End
Wrench, unthread the Screen Screw from the Gun Block. Remove the Screen Screw
retainer, the small ring-like part at the bottom of the screen, before removing the
screen. Remove the Retainer by hand. Now, slide off the Screen. If there are solid
particles attached to the Screen, attempt to soak the screen in Gun Cleaning Solvent.
However, if the screen is especially dirty and clogged, it is better to replace it.
2. CLEAN THE SCREEN SCREW CAVITY- Inspect the cavity, if any particles are
visible remove them with a combination of the Clean Out Drills mentioned above and
Cleaning Solvent.
WARNING: ANY MATERIAL LEFT IN THE CAVITY ON THE DOWNSTREAM SIDE OF THE SCREEN
WILL GO DIRECTLY INTO THE MODULE AND PROBABLY CLOG IT.
3. REPLACE THE SCREEN SCREW- Using the 3/8” x 5/16” Open End Wrench,
replace the Screen Screw. Make sure the screw is tight to insure the integrity of this
metal to metal seal.
4. CLEAN THE GUN- Clean the gun after cleaning the Cavities and Screens. See the
Cleaning Procedure section of this manual. In this case, flush the gun with the
module removed. This insures that all particles are expelled from the gun block and
prevents blockage of the module ports.

Model GX-8 Spray Gun
18 32943-1, Issue 1
Centerline Component Removal
TOOLS REQUIRED
• 10” Adjustable Wrench (P/N 909A)
• 3/8” x 5/16” Open End Wrench (P/N 1982A
• 1/2” Combination Wrench (P/N 1986)
• 5/16” Spintite (P/N 0904A)
• Lubriplate Grease (P/N 0553-2)
The Center Line Components consist of the following:
Pattern Control Disc
Rear Seal
Gun Block
PCD Retainer
Mixing Module
Packing Nut
Valving Rod
(PCD)
Screen Retainer
Iso Screen
Screen
Screen Retainer
Resin Screen
Screen Jam Nut
Screw
Screw
Assembly
Figure 10. Centerline Component Removal
WARNING: DISCONNECT THE CHEMICAL HOSES AND AIRLINE BEFORE SERVICING THE GUN.
IN ADDITION,BE SURE TO CLEAN THE “CENTER LINE COMPONENTS”WITH THE GUN SERVICE
KIT PRIOR TO REMOVAL FOR SERVICING AS THEY ARE EXPOSED TO THE CHEMICAL
1. CLOSE BOTH MANUAL VALVES- Using the 5/16” Spintite, turn each Manual
Valve fully clockwise.
2. ENGAGE THE SAFETY STOP- Push in and turn the Safety Stop knob clockwise to
place the gun in the Safety detented position.
3. REMOVE THE AIR CAP- Remove the Air Cap by hand.
4. REMOVE PCD RETAINER-Use the 10” Adjustable Wrench, to remove the PCD
Retainer.
5. REMOVE THE PATTERN CONTROL DISC (PCD)- Lift the PCD off the nose of
the Gun Block.

Operating Manual Servicing Procedures
4/21/99 19
Important: To free a PCD that appears to be stuck, set the Safety Stop to the Open
position, then depress and release the gun trigger to unseat it.
6. REMOVE THE MIXING MODULE- Reconnect the air line. Disengage the Safety
Stop and depress the trigger and release. The Mixing Module should unseat itself
from the Gun Block. Lift the Mixing Module off the end of the Valving Rod.
Engage the Safety Stop and disconnect the air line.
Important: Do not attempt to dig out the Module using knives or sharp objects.
7. LOOSEN THE PACKING NUT-Using the 5/16” Wrench, back out the Packing Nut
threeorfourturns.
NOTE:
By removing the Packing Nut
entirely the Rear Seal can be
removed and replaced.
8. REMOVE THE GUN BLOCK- Using the 5/16” Spintite, remove the Gun Block
Retaining Screw. Carefully slide the Gun Block away from the Valving Rod and Air
Cylinder. If dried chemical has built up on the Gun Block removal may be difficult.
Removing the dried chemical will make removal easier. Be careful not to lose the
small “O” Ring seal located in the top if the Gun Block.
9. REMOVE THE VALVING ROD- Using the 3/8” Wrench, on the hex shaped
Valving Rod Shank and the ½” Wrench on the Jam Nut loosen the Jam Nut by
turning it clock wise. (As viewed from the front of the gun.) Continue to back the
Jam Nut away from the Valving Rod Shank by three or four full turns. Remove the
Valving Rod by unthreading it from the Piston Assembly.
10. CLEAN ALL COMPONENTS THOROUGHLY BEFORE REASSEMBLY- Using
the appropriate Brass Brushes, Clean Out Drills, etc. remove residual chemical. Use
Cotton Swabs soaked with Gun Cleaner if necessary. When finished, coat the
threads and the mating surfaces of the Gun Block, Gun Block Bracket, and Gun with
Lubriplate Grease. Do not get any grease in the chemical ports located in the Gun
Block or Mixing Module as this could interfere with chemical flow.
11. INSPECT THE GUN BLOCK- It is important to keep the Gun Block clean and free
from damage to insure proper operation of the Spray Gun. It has been coated with a
proprietary coating to help protect it from damage and make it more difficult for
chemical to adhere to it. However, it still requires periodic attention.

Model GX-8 Spray Gun
20 32943-1, Issue 1
Centerline Component Installation
TOOLS REQUIRED
• 10” Adjustable Wrench (P/N 909A)
• 3/8” x 5/16” Open End Wrench (P/N 1982A
• 1/2” Combination Wrench (P/N 1986)
• 5/16” Spintite (P/N 0904A)
The Center Line Components consist of the following:
Pattern Control Disc
Rear Seal
Gun Block
PCD Retainer
Mixing Module
Packing Nut
Valving Rod
(PCD)
Screen Retainer
Iso Screen
Screen
Screen Retainer
Resin Screen
Screen Jam Nut
Screw
Screw
Assembly
Figure 11. Centerline Component Installation
1. INSTALL THE VALVING ROD- Thread the Jam Nut as far back on the Piston Rod
as possible. Screw the shank end of the Valving Rod onto the threaded end of the
Piston Rod.
2. INSTALL THE GUN BLOCK- Carefully slide the Gun Block onto the Valving Rod
towards the Air Cylinder. Using the 5/16” Spintite, install the Gun Block onto the
Gun Block Mounting Bracket.
3. INSTALL THE MIXING MODULE- With the air line connected, depress the Gun
Trigger Lever and slide the Mixing Module over the end of the Valving Rod while
making sure its alignment pin enters the alignment slot in the Gun Block. Keep the
Gun Trigger Lever depressed and proceed to Step 4.
Important: It is extremely important that these parts align properly. If they do not
the chemical flow from the Gun Block ports will not enter the Mixing Module when
triggering the gun
4. INSTALL THE PATTERN CONTROL DISC (PCD)- Maintain the Gun Trigger
Lever in the depressed position and place the PCD over the Mixing Module while
making sure the slot in the tip aligns with the Mixing Module alignment pin. If
installing a fan tip decide what orientation the fan spray pattern needs (vertical or
horizontal), and orient the PCD appropriately. Keep the Gun Trigger Lever
depressed and proceed to Step 5.