MVP ITD Series User manual

ITD Gun
Manual
This manual is applicable to the
following models:
 ITD-3500
 ITD-3500-A
 ITD-3500-INT
 ITD-3500-MCC
 ITD-3500-MCC-INT
 ITD-6500
 ITD-6500-MCC
 ITD-4000
 ITD-4000-A
 ITD-4000-INT
 ITD-4000-MCC
 ITD-400-MCC-INT
 ITD-6000
Rev.
March 2019

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CORPORATE HEADQUARTERS
2030 Falling Waters Rd, Suite 350, Knoxville, TN 37922 · USA · Tel: [phone]
DISTRIBUTION AND PURCHASING
642 Barbrow Ln, Knoxville, TN 37932 · USA · Tel: [phone]
TECHNOLOGY CENTER AND MANUFACTURING
1862 Ives Ave, Kent, WA 98032 · USA · Tel [phone] · Fax [phone]
E-mail: [email protected]om
For a list of international distributors, visit our website at :
www.mvpind.com/mvp-international
Use of this product co nfirms that Magnum Venus Products, Inc.’s standard terms and
conditions of sale apply.

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Table of Contents
Section Page
 Table of Contents 3
 Safety & Warning Information 4
 Introduction 15
 Disassembling Gun 17
 Repairing Components 17
 Repairing Gun Head 18
 Troubleshooting 20
 Parts Drawings 21

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Safety & Warning Information
Warnings
Due to the vast number of chemicals that could be used and their varying chemical reactions, the
buyer and user of this equipment should determine all factors relating to the fluids used, including
any of the potential hazards involved. Particular inquiry and investigation should be made into
potential dangers relating to toxic fumes, fires, explosions, reaction times, and exposure of
human beings to the individual components or their resultant mixtures. MVP assumes no
responsibility for loss, damage, expense or claims for bodily injury or property damage, direct or
consequential, arising from the use of such chemical components.
The end user is responsible for ensuring that the end product or system complies with all the
relevant laws in the country where it is to be used and that all documentation is adhered to.
Recommended Occupational Safety & Health Act (OSHA) Documentation:
 1910.94 Pertaining to ventilation
 1910.106 Pertaining to flammable liquids
 1910.107
Pertaining to spray finishing operations, particularly paragraph (m),
Organic Peroxides and Dual Component Coatings
For Additional information, contact the Occupational Safety and Health Administration (OSHA)
at https://www.osha.gov/about.html.
Recommended National Fire Protection Association (NFPA) Documentation:
 NFPA No.33 Chapter 14 Organic Peroxides and Dual Component Materials
 NFPA No. 63 Dust Explosion Prevention
 NFPA No. 70 National Electrical Code
 NFPA No. 77 Static Electricity
 NFPA No. 91 Blower and Exhaust System
 NFPA No. 654 Plastics Industry Dust Hazards
Fire Extinguisher – code ABC, rating number 4a60bc using Extinguishing Media –Foam,
Carbon Dioxide, Dry Chemical, Water Fog, is recommended for this product and applications.
The following general warnings and guidelines are for the setup, use, grounding, maintenance,
and repair of equipment. Additional product-specific warnings may be found throughout this
manual as applicable. Please contact your nearest MVP Technical Service Representative if
additional information is needed.

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Safety Precautions
 Avoid skin contact and inhalation of all chemicals.
 Review Material Safety Data Sheet (MSDS) to promote the safe handling of chemicals in
use.
 Restrict the use of all chemicals to designated areas with good ventilation.
 Chemicals are flammable and reactive.
 Noxious fumes released when combusted.
 Operate equipment in a ventilated environment only.
 Uncured liquid resins are highly flammable unless specifically labeled otherwise.
 Cured laminate, accumulations of overspray, and laminate sandings are highly combustible.
 Do not operate or move electrical equipment when flammable fumes are present.
 Ground all equipment.
 If a spark is seen or felt, immediately halt operation. Do not operate the equipment until the
issue has been identified and repaired.
 Contaminated catalyst may cause fire or explosion.
 Containers may explode if exposed to fire / heat.
 Use and store chemicals away from heat, flames, and sparks.
 Do not smoke in work areas or near stored chemicals.
 Do not mix Methyl Ethyl Ketone Peroxide (MEKP) with materials other than polyethylene.
 Do not dilute MEKP.
 Keep food and drink away from work area.

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Physical Hazards
 Never look directly into the spray gun fluid tip. Serious injury or death can result.
 Never aim the spray gun at or near another person. Serious injury or death can result.
 Chemical compounds can be severely irritating to the eyes and skin.
 Inhalation, ingestion, or injection may damage internal organs and lead to pulmonary disorders, cancers,
lymphomas, and other diseases or health conditions.
 Other potential health effects include: irritation of the eyes and upper respiratory tract, headache, light-
headedness, dizziness, confusion, drowsiness, nausea, vomiting, and occasionally abdominal pain.
 Eye contact: Immediately flush with water for at least 15 minutes and seek immediate medical attention.
 Skin Contact: Immediately wash with soap and water and seek immediate medical attention.
 Inhalation: Move the person to fresh air and seek immediate medical attention.
 Do not remove shields, covers, or safety features on equipment that is in use.
 Never place fingers, hands, or any body part near or directly in front of the spray gun fluid tip. The force
of the liquid as it exits the spray tip can shoot liquid through the skin.
 Keep hands and body parts away from any moving equipment or components.
 Do not stand under plunger
 An improperly loaded drum may lead to an imbalance, causing a unit to tip over
Personal Protective Equipment (PPE)
 MVP recommends the use of personal safety equipment with all products in our catalog.
 Wear safety goggles, hearing protection, a respirator, and chemical resistant gloves.
 Wear long sleeve shirts or jackets and pants to minimize skin exposure.
 PPE should be worn by operators and service technicians to reduce the risk of injury.
For Additional information, contact the Occupational Safety and Health Administration
(OSHA). https://www.osha.gov/about.html

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Symbol Definitions
Indicates the risk of
contact with chemicals
that are hazardous, which
may lead to injury or
death.
Indicates the risk of
contact with voltage /
amperage that may lead
to serious injury or death
Indicates that the
materials being used are
susceptible to combustion
Indicates the risk of
contact with moving
components that may
lead to serious injury or
death.
Indicates that the system
or component should be
grounded before
proceeding with use or
repair.
Indicates the use of lit
cigarettes or cigars is
prohibited, because the
materials being used are
susceptible to
combustion.
Indicates that the
materials and/or the
process being performed
can lead to ignition and
explosion.
A recommendation for
the use of Personal
Protective Equipment
(PPE) before using or
repairing the product.

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Polymer Matrix Materials: Advanced Composites
Potential health hazards associated with the use of advanced composites can be controlled through
the implementation of an effective industrial hygiene and safety program.
https://www.osha.gov/dts/osta/otm/otm_iii/otm_iii_1.html#t iii:1_1
Resins
Composite Component Organ System Target
(Possible Target)
Known (Possible) Health Effect
Epoxy resins Skin, lungs, eyes Contact and allergic dermatitis,
conjunctivitis
Polyurethane resins Lungs, skin, eyes Respiratory sensitization, contact
dermatitis, conjunctivitis
Phenol formaldehyde Skin, lungs, eyes As above (potential carcinogen)
Bismaleimides (BMI) Skin, lungs, eyes As above (potential carcinogen)
Polyamides Skin, lungs, eyes As above (potential carcinogen)
Reinforcing materials
Composite Component Organ System Target
(Possible Target)
Known (Possible) Health Effect
Aramid fibers Skin (lungs) Skin and respiratory irritation, contact
dermatitis (chronic interstitial lung disease)
Carbon/graphite fibers Skin (lungs) As noted for aramid fibers
Glass fibers (continuous
filament) Skin (lungs) As noted for aramid fibers
Hardeners and curing agents
Composite Component Organ System Target
(Possible Target)
Known (Possible) Health Effect
Diaminodiphenylsulfone N/A No known effects with workplace
exposure
Methylenedianiline Liver, skin Hepatotoxicity, suspect human carcinogen
Other aromatic amines
Composite Component Organ System Target
(Possible Target)
Known (Possible) Health Effect
Meta-phenylenediamine (MPDA) Liver, skin (kidney,
bladder)
Hepatitis, contact dermatitis (kidney and
bladder cancer)
Aliphatic andcyclo-aliphatic
amines
Eyes, skin Severe irritation, contact dermatitis
Polyaminoamide Eyes, skin Irritation (sensitization)
Anhydride Eyes, lungs, skin Severe eye and skin irritation, respiratory
sensitization, contact dermatitis

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Catalyst - Methyl Ethyl Ketone Peroxide (MEKP)
MEKP is among the more hazardous materials found in commercial channels. The safe handling
of the “unstable (reactive)” chemicals presents a definite challenge to the plastics industry. The
highly reactive property which makes MEKP valuable to the plastics industry in producing the
curing reaction of polyester resins also produces the hazards which require great care and caution
in its storage, transportation, handling, processing and disposal. MEKP is a single chemical.
Various polymeric forms may exist which are more or less hazardous with respect to each other.
These differences may arise not only from different molecular structures (all are, nevertheless,
called “MEKP”) and from possible trace impurities left from the manufacture of the chemicals, but
may also arise by contamination of MEKP with other materials in its storage or use. Even a small
amount of contamination with acetone, for instance, may produce an extremely shock-sensitive
and explosive compound.
WARNING
Contamination with promoters, materials containing promoters (such as
laminate sandings), or with any readily oxidizing material (such as brass or
iron) will cause exothermic redox reactions which can be explosive in
nature. Heat applied to MEKP or heat buildup from contamination reactions
can cause the material to reach its Self-Accelerating Decomposition
Temperature (SADT).
Researchers have reported measuring pressure rates-of-rise well over 100,000 psi per second when
certain MEKP’s reach their SADT. For comparison, the highest-pressure rate-of-rise listed in
NFPA Bulletin NO.68, “Explosion Venting”, is 12,000 psi per second for an explosion of 12%
acetylene and air. The maximum value listed for a hydrogen explosion is 10,000 psi per second.
Some forms of MEKP, if allowed to reach their SADT, will burst even an open topped container.
This suggests that it is not possible to design a relief valve to vent this order of magnitude of
pressure rate-of-rise. The user should be aware that any closed container, be it a pressure vessel,
surge chamber, or pressure accumulator, could explode under certain conditions. There is no
engineering substitute for care by the user in handling organic peroxide catalysts. If, at any time,
the pressure relieve valve on top of the catalyst tank should vent, the area should be evacuated at
once and the fire department called. The venting could be the first indication of a heat, and
therefore, pressure build-up that could eventually lead to an explosion. Moreover, if a catalyst
tank is sufficiently full when the pressure relief valve vents, some catalyst may spray out, which
could cause eye injury. For this reason, and many others, anyone whose job puts them in an area
where this vented spray might go, should always wear full eye protection even when laminating
operations are not taking place.
Safety in handling MEKP depends to a great extent on employee education, proper safety
instructions, and safe use of the chemicals and equipment. Workers should be thoroughly
informed of the hazards that may result from improper handling of MEKP, especially regarding
contamination, heat, friction and impact. They should be thoroughly instructed regarding the
proper action to be taken in the storage, use, and disposal of MEKP and other hazardous
materials used in the laminating operation. In addition, users should make every effort to:
 Store MEKP in a cool, dry place in original containers away from direct sunlight and away
from other chemicals.
 Keep MEKP away from heat, sparks, and open flames.
 Prevent contamination or MEKP with other materials, including polyester over spray and
sandings, polymerization accelerators and promoters, brass, aluminum, and non-stainless
steels.

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 Never add MEKP to anything that is hot, since explosive decomposition may result.
 Avoid contact with skin, eyes, and clothing. Protective equipment should be worn at all
times. During clean-up of spilled MEKP, personal safety equipment, gloves, and eye
protection must be worn. Firefighting equipment should be at hand and ready.
 Avoid spillage, which can heat up to the point of self-ignition.
 Repair any leaks discovered in the catalyst system immediately, and clean-up the leaked
catalyst at once in accordance with the catalyst manufacturer’s instructions.
 Use only original equipment or equivalent parts from Magnum Venus Products in the catalyst
system (i.e.: hoses, fitting, etc.) because a dangerous chemical reaction may result between
substituted parts and MEKP.
 Catalyst accumulated from the purging of hoses or the measurement of fluid output
deliveries should never be returned to the supply tank, such catalyst should be diluted with
copious quantities of clean water and disposed of in accordance with the catalyst
manufacturer’s instructions.
The extent to which the user is successful in accomplishing these ends and any additional
recommendations by the catalyst manufacturer determines largely the safety that will be present
in his operation.
Clean-Up Solvents and Resin Diluents
WARNING
A hazardous situation may be present in your pressurized fluid system! Hydro
carbon solvents can cause an explosion when used with aluminum or
galvanized components in a closed (pressurized) fluid system (pump,
heaters, filters, valves, spray guns, tanks, etc.). An explosion could cause
serious injury, death, and/or substantial property damage. Cleaning agents,
coatings, paints, etc. may contain Halogenated Hyrdrocarbon solvents. Some
Magnum Venus Products spray equipment includes aluminum or galvanized
components and will be affected by Halogenated Hydrocarbon solvents.
There are three key elements to the Halogenated Hyrdocarbon (HHC) solvent hazard.
1. The presence of HHC
solvents.
1,1,1 – Trichloroethane and Methylene Chloride are the most common of
these solvents. However, other HHC solvents are suspect if used; either
as part of paint or adhesives formulation, or for clean-up flushing.
2. Aluminum or
Galvanized Parts.
Most handling equipment contains these elements. In contact with
these metals, HHC solvents could generate a corrosive reaction of a
catalytic nature.
3. Equipment capable of
withstanding pressure.
When HHC solvent contact aluminum or galvanized parts inside a
closed container such as a pump, spray gun, or fluid handling system,
the chemical reaction can, over time, result in a build-up of heat and
pressure, which can reach explosive proportions. When all three
elements are present, the result can be an extremely violent explosion.
The reaction can be sustained with very little aluminum or galvanized
metal; any amount of aluminum is too much.

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 The reaction is unpredictable. Prior use of an HHC solvent without incident (corrosion or
explosion) does NOT mean that such use is safe. These solvents can be dangerous alone (as a
clean-up or flushing agent) or when used as a component or a coating material. There is no
known inhibitor that is effective under all circumstances. Mixing HHC solvents with other
materials or solvents such as MEKP, alcohol, or toluene may render the inhibitors ineffective.
 The use of reclaimed solvents is particularly hazardous. Reclaimers may not add any inhibitors.
The possible presence of water in reclaimed solvents could also feed the reaction.
 Anodized or other oxide coatings cannot be relied upon to prevent the explosive reaction. Such
coatings can be worn, cracked, scratched, or too thin to prevent contact. There is no known way
to make oxide coatings or to employ aluminum alloys to safely prevent the chemical reaction
under all circumstances.
 Several solvent suppliers have recently begun promoting HHC solvents for use in coating
systems. The increasing use of HHC solvents is increasing the risk. Because of their exemption
from many state implementation plans as Volatile Organic Compounds (VOCs), their low
flammability hazard, and their not being classified as toxic or carcinogenic substances, HHC
solvents are very desirable in many respects.
WARNING
Do not use Halogenated Hydrocarbon (HHC) solvents in pressurized fluid
systems having aluminum or galvanized wetted parts.
Magnum Venus Products is aware of NO stabilizers available to prevent HHC
solvents from reaction under all conditions with aluminum components in
closed fluid systems. HHC solvents are dangerous when used with aluminum
components in a closed fluid system.
 Consult your material supplier to determine whether your solvent or coating contains
Halogenated Hydrocarbon solvents.
 Magnum Venus Products recommends that you contact your solvent supplier regarding the best
non-flammable clean-up solvent with the heat toxicity for your application.
 If, however, you find it necessary to use flammable solvents, they must be kept in approved,
electrically grounded containers.
 Bulk solvent should be stored in a well-ventilated, separate building, 50 feet away from your main
plant.
 You should only allow enough solvent for one day’s use in your laminating area.
 NO SMOKING signs must be posted and observed in all areas of storage or where solvents and
other flammable materials are used.
 Adequate ventilation (as covered in OSHA Section 1910.94 and NFPA No.91) is important
wherever solvents are stored or used, to minimize, confine and exhaust the solvent vapors.
 Solvents should be handled in accordance with OSHA Section 1910.106 and 1910.107.

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Catalyst Diluents
Magnum Venus Products spray-up and gel-coat systems currently produced are designed so that
catalyst diluents are not required. Magnum Venus Products therefore recommends that diluents
not be used to avoid possible contamination which could lead to an explosion due to the handling
and mixing of MEKP and diluents. In addition, it eliminates any problems from the diluent being
contaminated through rust particles in drums, poor quality control on the part of the diluents
suppliers, or any other reason. If diluents are absolutely required, contact your catalyst supplier
and follow his instructions explicitly. Preferably the supplier should premix the catalyst to prevent
possible “on the job” contamination while mixing.
WARNING
If diluents are not used, remember that catalyst spillage and gun, hose,
and packing leaks are potentially more hazardous since each drop
contains a higher concentration of catalyst and will therefore react more
quickly with overspray and the leak.
Cured Laminate, Overspray and Laminate Sandings Accumulation
 Remove all accumulations of overspray, Fiberglass Reinforced Plastic (FRP) sandings, etc. from
the building as they occur. If this waste is allowed to build up, spillage of catalyst is more likely to
start a fire; in addition, the fire would burn hotter and longer.
 Floor coverings, if used, should be non-combustible.
 Spilled or leaked catalyst may cause a fire if it comes in contact with an FRP product, over-
sprayed chop or resin, FRP sandings or any other material with MEKP.
To prevent spillage and leakage, you should:
1. Maintain your Magnum Venus
Products System.
Check the gun several times daily for catalyst and
resin packing or valve leaks. REPAIR ALL LEAKS
IMMEDIATELY.
2. Never leave the gun hanging over
or lying inside the mold.
A catalyst leak in this situation would certainly
damage the part, possibly the mold, and may cause
a fire.
3. Inspect resin and catalyst hoses
daily for wear or stress at the entry
and exits of the boom sections and
at the hose and fittings.
Replace if wear or weakness is evident or
suspected.
4. Arrange the hoses and fiberglass
roving guides so that the fiberglass
strands DO NOT rub against any of
the hoses at any point.
If allowed to rub, the hose will be cut through,
causing a hazardous leakage of material which
could increase the danger of fire. Also, the material
may spew onto personnel in the area.

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Toxicity of Chemicals
 Magnum Venus Products recommends that you consult OSHA Sections 1910.94, 1910.106,
1910.107 and NFPA No.33, Chapter 14, and NFPA No.91.
 Contact your chemical supplier(s) and determine the toxicity of the various chemicals used as
well as the best methods to prevent injury, irritation and danger to personnel.
 Also determine the best methods of first aid treatment for each chemical used in your plant.
Equipment Safety
Magnum Venus Products suggest that personal safety equipment such as EYE GOGGLES,
GLOVES, EAR PROTECTION, and RESPIRATORS be worn when servicing or operating this
equipment. Ear protection should be worn when operating a fiberglass chopper to protect against
hearing loss since noise levels can be as high as 116 dB (decibels). This equipment should only be
operated or serviced by technically trained personnel!
CAUTION
Never place fingers, hands, or any body part near or directly in front of the
spray gun fluid tip. The force of the liquid as it exits the spray tip can cause
serious injury by shooting liquid through the skin. NEVER LOOK DIRECTLY
INTO THE GUN SPRAY TIP OR POINT THE GUN AT OR NEAR ANOTHER
PERSON OR AN ANIMAL.
DANGER
Contaminated catalyst may cause fire or explosion. Before working on the
catalyst pump or catalyst accumulator, wash hands and tools thoroughly.
Be sure work area is free from dirt, grease, or resin. Clean catalyst system
components with clean water daily.
DANGER
Eye, skin, and respiration hazard. The catalyst MEKP may cause blindness,
skin irritation, or breathing difficulty. Keep hands away from face. Keep
food and drink away from work area.
Treatment of Chemical Injuries
CAUTION
Refer to your catalyst manufacturer’s safety information regarding the safe
handling and storage of catalyst. Wear appropriate safety equipment as
recommended.
Great care should be used in handling the chemicals (resins, catalyst and solvents) used in polyester
systems. Such chemicals should be treated as if they hurt your skin and eyes and as if they are
poison to your body. For this reason, Magnum Venus Products recommends the use of protective
clothing and eye wear in using polyester systems. However, users should be prepared in the event of
such an injury.

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Precautions include:
1. Know precisely what chemicals you are using and obtain information from your chemical
supplier on what to do in the event the chemical gets onto your skin or into the eyes, or if
swallowed.
2. Keep this information together and easily available so that it may be used by those
administering first aid or treating the injured person.
3. Be sure the information from your chemical supplier includes instructions on how to treat
any toxic effects the chemicals have.
WARNING
Contact your doctor immediately in the event of an injury. If the product’s
MSDS includes first aid instructions, administer first aid immediately after
contacting a doctor.
Fast treatment of the outer skin and eyes that contact chemicals generally includes immediate
and thorough washing of the exposed skin and immediate and continuous flushing of the eyes
with lots of clean water for at least 15 minutes or more. These general instructions of first aid
treatment may be incorrect for some chemicals; you must know the chemicals and treatment
before an accident occurs. Treatment for swallowing a chemical frequently depends upon the
nature of the chemical.
Emergency Stop Procedure
In an emergency, follow these steps to stop a system:
1. The ball valve located where the air enters the power head of the resin pump, should be moved to
the “OFF” or closed position.
Note The “open” or “on” position is when the ball valve handle is parallel (in line) with
the ball valve body. The “closed” or “off” position is when the ball valve handle
is perpendicular (across) the ball valve body.
2. Turn all system regulators to the “OFF” position (counter-clockwise) position.
3. Verify / secure the catalyst relief line, located on the catalyst relief valve.
4. Verify / secure the resin return line, located on the resin filter.
5. Place a container under the resin pump ball valve to catch ejected resin.
6. Locate the ball valve on the resin pump.
7. Rotate the ball valve 90 degrees to the “On” or open position.
Grounding
Grounding an object means providing an adequate path for the flow of the electrical charge from the
object to the ground. An adequate path is one that permits charge to flow from the object fast enough
that it will not accumulate to the extent that a spark can be formed. It is not possible to define exactly
what will be an adequate path under all conditions since it depends on many variables. In any event,
the grounding means should have the lowest possible electrical resistance.

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Grounding straps should be installed on all loose conductive objects in the spraying area. This
includes material containers and equipment. Magnum Venus Products recommends grounding straps
be made of AWG No.18 stranded wire as a minimum and the larger wire be used where possible.
NFPA Bulletin No77 states that the electrical resistance of such a leakage path may be as low as 1
meg ohm (10 ohms) but that resistance as high as 10,000 meg ohms will produce an adequate leakage
path in some cases.
CAUTION
Whenever flammable or combustible liquids are transferred from one container to
another, or from one container to the equipment, both containers or container and
equipment shall be effectively bonded and grounded to dissipate static electricity.
For further information, see National Fire Protection Association (NFPA) 77, titled
“Recommended Practice on Static Electrical”. Refer especially to section 7-7
titled “Spray Application of Flammable and Combustible Materials”.
Introduction
MVP’s ITD guns are in the AT, or air trigger, series of guns. The AT series guns feature low
maintenance, few adjustments, superb quality, and long service life. As the gun trigger is pulled,
air is shifted from one side of a piston to the other. The pistons are attached to gun needles that
open and close the gun.
This manual provides information for the operation, maintenance, and simple repair of the MVP
ITD Gun. The following procedures are included:
 Step-by-step assembly and disassembly
 Troubleshooting information
Please read this manual carefully and retain for future reference. Follow the steps
in the order given, otherwise you may damage the equipment or injure yourself.
As you disassemble the equipment, lay out the components on a clean surface in the correct order
and direction to aid in reassembly.
This manual covers all of the variations of the ITD gun:
 ITD-3500-XXX External Mix Gelcoat Gun
 ITD-6500-XXX External Mix Gelcoat Gun – with Signal
 ITD-4000-XXX External Mix Chopper Gun
 ITD-6000-XXX External Mix Chopper Gun – with Signal

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Gun Overview
Catalyst Weep
Hole
Air Assist
Adjustment
Trigger
Lock
Trigger
Retaining
Ring
Spray
Tip
Resin Weep
Hole
Mounting
Screws

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Disassembling Gun
1. Remove the two Allen screws from the side of the gun to separate the handle from the
head/cylinder.
2. Remove the two screws on the back of the cylinder.
3. Using caution, remove the cylinder from the back of the gun head.
Disassemble the Handle
4. Loosen the set screw on the trigger button assembly and remove the button.
5. Unscrew and remove the trigger lock.
6. Remove the trigger housing.
7. Remove the trigger valve assembly from the front of the gun.
8. Unscrew the refinement air adjustment screw and remove from the side of the gun.
9. Remove the refinement air spring and adjustment screw from the side of the gun.
10. Unscrew the refinement air packing nut from the side of the gun and remove the O-rings.
11. Remove the three O-rings on the top of the handle.
Repairing Components
Assemble the Handle
1. Thoroughly clean and inspect all parts for wear or damage.
2. Open the seal kit and match the O-rings with the ones being replaced.
3. Replace the O-rings on the trigger valve.
Note A special tool is available to install the O-rings on the trigger valve, part
number ATC-40103-1.
4. Install the spring onto the trigger valve and install into the front of the gun.
5. Thread the trigger housing into the front of the gun over the trigger valve using a 716
”
wrench.
6. Thread the trigger lock into the trigger housing.
7. Place the trigger button onto the end of the trigger valve, depressing it all the way.
8. While holding the trigger down, tighten the set screw on the side of the trigger button to hold
it in place.
9. Replace the O-rings in the air refinement needle valve on the side of the handle, placing the
Buna (black) O-ring first and then the Teflon (white).
10. Install the packing nut just until it stops.
11. Place the spring onto the refinement air needle.

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12. Lubricate the refinement air needle with Super O Lube and install into the side of the gun.
13. Replace the O-rings on top of the handle.
14. Set the handle aside.
Repair the Cylinder
15. Remove and check the spring from the inside of the cylinder.
16. Check the inside of the cylinder.
17. Check and clear air ports on the bottom of the cylinder.
18. If you have a gelcoat gun, lubricate the inside of the cylinder and then skip to step 26.
19. Remove the chopper air fitting from the back of the cylinder.
20. Push out the chopper air poppet valve and spring from the inside of the cylinder.
21. Replace the O-rings on the chopper poppet valve.
22. Lubricate the inside of the cylinder and the chopper poppet valve.
23. Push the chopper poppet valve and spring into the back of the cylinder.
24. Replace the O-ring on the chopper air fitting.
25. Push the end of the poppet valve from the inside of the cylinder to check that it is moving
freely.
26. Reinstall the spring into the cylinder.
Repairing Gun Head
1. Remove the catalyst spool valve assembly.
2. Unscrew the valve back from the catalyst piston, using caution not to lose the lock nut.
3. Replace the O-rings on the valve back and catalyst piston.
Note A special tool is available to install the O-rings on the catalyst spool valve; part
number ATC-40204-1.
4. Install the lock washer on the valve back.
5. Thread the valve back into the catalyst piston.
Note Use a drop of removable thread lock compound on threads of the valve front
and back during reassembly.
6. Unscrew the valve front from the valve back.
Note The threads on the valve front are reverse threaded and will unscrew
clockwise from the valve back.
7. Install new O-rings on the valve front and an O-ring between the valve front and valve back.
8. Thread the valve front into the valve back and set the catalyst spool aside.

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Page | 19
9. Install a new O-ring onto the catalyst cylinder on the gun head.
10. Remove the two set screws on the side of the gun head assembly holding the catalyst
cylinder in place.
11. Remove catalyst cylinder from the gun head.
12. Make note of the O-ring positions on the catalyst cylinder.
Note Installing the new O-rings in the wrong positions will cause the gun to work
improperly.
13. Replace the old O-ring with the new O-rings from the seal kit.
14. Lubricate the O-rings with SSL-10 or petroleum jelly.
15. Reinstall the catalyst cylinder into the gun head by rotating it back and forth while pushing it
into the gun, using caution not to damage the O-rings.
16. Align the hole in the catalyst cylinder with the hole in the side of the gun head.
17. Replace the set screws in the gun head.
18. Using a ½” nut driver, remove the diffuser seat from the front of the gun.
19. Pull the resin needle piston assembly from the back of the gun head.
20. Replace the O-ring on the resin needle piston.
21. Remove the packing retainer from the back of the gun head and replace the O-ring with a
new one.
22. Replace the packing retainer into the back of the gun head.
23. Replace the O-ring for the resin cylinder seal.
24. Replace the two tip pin O-rings on the front of the gun.
25. Remove the catalyst cylinder plug on the front of the gun head and replace the O-ring.
26. Reinstall the catalyst cylinder plug into the front of the gun head.
27. Replace the O-rings on the diffuser seat.
28. Replace the packing, positioning it so that the resin needle can pass through it.
29. Press the diffuser seat as far as it will go into the front of the gun head.
30. Using a ½” nut driver, screw the diffuser seat in a few threads.

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Page | 20
31. Install the resin needle assembly into the back of the gun head.
32. Using the ½” nut driver, adjust the diffuser seat to snug and then just a bit more.
33. Insert the catalyst spool valve assembly into the back of the gun head.
34. Using the two screws, attach the cylinder assembly to the gun head.
35. Attach the gun head and cylinder to the handle.
Troubleshooting
AT Gun Troubleshooting
Symptom Possible Cause Remedy
Air leaking from exhaust
port on back of handle
while trigger is OFF
O-ring material worn or cut
Replace O-rings
O-rings on catalyst piston worn
or cut
O-rings on trigger valve worn or
cut
Air leaking from exhaust
port on back of handle
while trigger is either
ON or OFF
O-rings on trigger valve worn or
cut Replace O-rings
O-rings on catalyst valve and/or
material piston worn or cut
Catalyst leaking from
catalyst tip while gun is
not being triggered
O-rings on catalyst valve worn or
cut Replace O-rings
Catalyst leaks from
weep hole on catalyst
side of gun
O-rings on catalyst valve worn or
cut Replace O-rings
No catalyst coming from
gun
Catalyst air piston not actuating
Check for clogged catalyst air passages (small
holes under back cylinder)
Note There is more than one passageway
Plugged catalyst restrictor (Allen
screw with orifice located in front
of catalyst valve)
Clean and clear orifice in front of catalyst valve
Plugged catalyst passageway in
head of gun or catalyst tips Inspect, clean, and clear passageways
No catalyst flow to gun Service the slave pump. Refer to your system
manual
Material leaking from tip
(front of gun)
Loose diffuser seat
Tighten diffuser seat ¼ to ½ turn at a time until
snug and then one more ¼ turn.
Note Overtightening may cause material
needle binding
Worn needle packing Replace packing and adjust as indicated above