Pneumatic Mini HVLP Spray Gun
#505501, JAT-501
Operation & Parts Manual
M-505501
Edition 2
11/2018
JET
427 New Sanford Road
LaVergne, TN 37086
Ph.: 800-274-6848
www.jettools.com
Copyright © 2015 JET
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Warranty and Service
JET warrants every product it sells against manufacturers’ defects. If one of our tools needs service or repair, please contact
Technical Service by calling 1-800-274-6846, 8AM to 5PM CST, Monday through Friday.
Warranty Period
The general warranty lasts for the time period specified in the literature included with your product or on the official JET branded
website.
JET products carry a limited warranty which varies in duratio n based upon the product. (See chart below)
Accessories carry a limited warranty of one year from the date of receipt.
Consumable items are defined as expendable parts or accessories expected to become inoperable within a
reasonable amount of use and are covered by a 90 day limited warranty against manufacturer’s defects.
Who is Covered
This warranty covers only the initial purchaser of the product from the date of delivery.
What is Covered
This warranty covers any defects in workmanship or materials subject to t he limitations stated below. This warranty does not cover
failures due directly or indirectly to misuse, abuse, negligence or accidents, normal wear-and-tear, improper repair, alterations or
lack of maintenance. JET woodworking machinery is designed to be used with Wood. Use of these machines in the processing of
metal, plastics, or other materials outside recommended guidelines, may void the warranty. The exceptions are acrylics and other
natural items that are made specifically for wood turning.
Warranty Limitations
Woodworking products with a Five Year Warranty that are used for commercial or industrial purposes default to a Two Year
Warranty. Please contact Technical Service at 1-800-274-6846 for f urther clarification.
How to Get Technical Support
Please contact Technical Service by calling 1-800-274-6846. Please note that you will be asked to provide proof of initial
purchase when calling. If a product requires further inspection, the Technical Service representative will explain and assist with
any additional action needed. JET has Authorized Service Ce nters located throughout the United States. For the name of an
Authorized Service Center in your area call 1-800-274-6846 or use the Service Center Locator on the JET website.
More Information
JET is constantly adding new products. For complete, up-to-date product information, check with your local distributor or visit the
JET website.
How State Law Applies
This warranty gives you specific legal rights, subject to appl icable state law.
Limitations on This Warranty
JET LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR EACH PRODUCT. EXCEPT AS
STATED HEREIN, ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE A RE
EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE
ABOVE LIMITATION MAY NOT APPLY TO YOU.
JET SHALL IN NO EVENT BE LIABLE FOR DEATH, INJURIES TO PERSONS OR PROPERTY, OR FOR INCIDENTAL,
CONTINGENT, SPECIAL, OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OF OUR PRODUCTS. SOME STATES
DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE
LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
JET sells through distributors only. The specifications listed in JET printed materials and on official JET websi te are given as
general information and are not binding. JET reserves the right to effect at any time, without prior notice, those alterations to parts,
fittings, and accessory equipment which they may deem necessary for any reason whatsoever. JET® branded products are not
sold in Canada by JPW Industries, Inc.
Product Listing with Warranty Period
90 Days – Parts; Consumable items; Light-Duty Air Tool s
1 Year – Motors; Machine Accessories; Heavy-Duty Air Tool s; Pro-Duty Air Tools
2 Year – Metalworking Machinery; Electric Hoists, El ectric Hoist Accessories; Woodworking Machinery used for industrial
or commercial purposes
5 Year – Woodworking Machinery
Limited Lifetime – JET Parallel clamps; VOLT Series Electric Hoists; Manual Hoists; Manual Hoist
Accessories; Shop Tools; Warehouse & Dock products; Hand Tools
NOTE: JET is a division of JPW Industries, Inc. References in this document to JET also apply to JPW Industries, Inc., or any of
its successors in interest to the JET brand.
JAT-501 Mini HVLP Spray Gun
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Safety warnings
General air tool warnings
1. Read and understand this entire manual
before attempting assembly or operation.
2. Read and understand all warnings posted on
the tool and in this manual. Failure to comply
with all of these warnings may cause serious
injury.
3. Replace warning labels if they become
obscured or removed.
4. Do not use this tool for other than its intended
use. If used for other purposes, JET disclaims
any real or implied warranty and holds itself
harmless from any injury that may result from
that use.
5. Always wear approved safety glasses or face
shield while using this tool. (Everyday
eyeglasses only have impact resistant lenses;
they are not safety glasses.)
6. Wear ear protectors (plugs or muffs) if the
noise exceeds safe levels.
7. Wear gloves and protective clothing if
operation produces sparks or flying particles.
Gloves should be tight-fitting, without frayed
fingers or hanging threads. Keep hands and
body away from the working area of tool.
8. Do not operate an air tool continually at full
throttle without a work load on the tool.
9. The air tool must be properly lubricated before
operating.
10. Never start a percussion type air tool (chipper,
breaker, buster, etc.) without securing the
tooling in the retainer and placing the tip
against the work surface.
11. Do not operate air tool without its guards in
place. Do not modify the tool.
12. Do not operate this tool while tired or under
the influence of drugs, alcohol, or any
medication.
13. Adopt a comfortable posture with proper
balance, and maintain secure footing at all
times. Non-slip footwear or anti-skid floor
strips are recommended.
14. Do not wear loose clothing or jewelry. Confine
long hair.
15. Excessive air pressure and too much free
rotation may decrease life of the tool and may
cause a hazardous situation.
16. Check air hoses for wear, and keep them
away from heat and sharp edges. Repair or
replace damaged air hose immediately. Do
not carry tool by the air hose.
17. Air hose may cause tripping hazards; keep
hose away from traffic areas.
18. Do not use this tool near flammable objects,
or in potentially explosive environments. Do
not use near live electrical wires.
19. Do not use power tools in damp or wet
location, or expose them to rain. Keep work
area well lighted.
20. Do not leave a connected tool unattended.
When not in use, disconnect tool from air
source.
21. Shut off air supply and discharge any residual
pressure from tool before removing hose,
making adjustments, changing accessories,
or storing tool.
22. Make sure tool is switched off, and your finger
off the trigger, before connecting to air supply.
23. Remove adjusting keys and wrenches before
turning on tool.
24. Keep visitors a safe distance from the work
area. Keep children away.
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25. Give your work undivided attention. Looking
around, carrying on a conversation and
“horse-play” are careless acts that can result
in serious injury.
26. Do not force a tool or attachment to do a job
for which it was not designed. The right tool
will do the job better and more safely.
27. Repetitive motions and/or exposure to
constant vibration can be harmful to hands
and arms. Take frequent breaks and relax
hands during extended operation. Change
posture to avoid discomfort or fatigue.
28. Compressed air can be harmful if directed
toward sensitive areas of the body, and may
propel small particles caught in the air stream.
Exercise proper caution.
29. Use only recommended accessories;
improper accessories may be hazardous.
30. Maintain tools with care. Keep air tool clean
and oiled for best and safest performance.
31. Do not use combustible gases, carbon
dioxide, oxygen or any bottled gas as an air
source for the tool. These can present risk of
explosion and serious injury.
32. Do not lubricate the tool with combustible
liquids, such as kerosene, diesel or jet fuel.
33. Do not dispose of this tool with normal
household waste. Never dispose of the air tool
into fire.
Specific warnings for Spray Guns
34. Solvent and paint fumes can ignite causing an
explosion. Exercise caution and use
appropriate ventilation systems. It is the
responsibility of the owner to understand and
comply with any codes or regulations
concerning hazardous materials.
35. Wear appropriate eye and respiratory
protection when using this spray gun.
36. Read, understand and follow all safety
warnings by the material and solvent
manufacturer.
37. Do not spray flammable materials near open
flames, pilot lights or other sources of ignition.
WARNING: This product can expose you
to chemicals including lead which is known to
the State of California to cause cancer and
birth defects or other reproductive harm. For
more information go to http://www.
p65warnings.ca. gov.
WARNING: Some dust, fumes and gases
created by power sanding, sawing, grinding,
drilling, welding and other construction
activities contain chemicals known to the State
of California to cause cancer and birth defects
or other reproductive harm. Some examples of
these chemicals are:
lead from lead based paint
crystalline silica from bricks, cement and
other masonry products
arsenic and chromium from chemically
treated lumber
Your risk of exposure varies, depending on
how often you do this type of work. To reduce
your exposure to these chemicals, work in a
well-ventilated area and work with approved
safety equipment, such as dust masks that are
specifically designed to filter out microscopic
particles. For more information go to
http://www.p65warnings.ca.gov/ and http://
www.p65warnings.ca.gov/wood.
Familiarize yourself with the following safety
notices used in this manual:
This means that if precautions
are not heeded, it may result in serious, or even
fatal, injury.
This means that if precautions
are not heeded, it may result in minor injury
and/or possible tool damage.
JAT-501 Mini HVLP Spray Gun
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About this manual
This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model
JAT-501 Pneumatic Mini Spray Gun. This manual contains instructions on safety precautions, general
operating procedures, maintenance procedures and parts breakdown. Your tool has been designed and
constructed to provide consistent, long-term operation if used in accordance with the instructions set forth
in this document.
The instructions and warnings in this manual may not encompass all possible workplace environments. The
operator is expected to take appropriate precautions and exercise common sense. As with any tool
operation, safety of operator and bystanders should be first priority.
If there are questions or comments, please contact your local supplier or JET. JET can also be reached at
our web site: www.jettools.com.
Record the serial number and purchase information of your tool on the cover of this manual for quick access.
Retain this manual for future reference. If the tool transfers ownership, the manual should accompany it.
JET
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Tool specifications
Model number JAT-501
Stock number 505501
Gun type HVLP (High Volume Low Pressure)
Feed type Gravity
Cup capacity 125cc
Fluid nozzle provided 1.0 mm
Fluid output 90 cc/min
Maximum fan pattern size 140 mm
Air consumption 3.8 CFM at 28 PSI (2 bar)
Working pressure 15-28 PSI (1.05-2 bar)
Air Inlet 1/4 in. PS
Fluid inlet M14 x 1.0P
Overall length 9.84 in. (249.94 mm) with cap; 6.69 in. (169.93 mm) without cap
Body material Die casting
Fluid tip and needle material Stainless steel
Net weight, gun body 0.64 lb (0.29 kg)
Net weight, accessories 0.35 lb (0.16 kg)
Shipping weight 1.32 lb (0.6 kg)
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The specified values are emission levels and are not necessarily to be seen as safe operating levels. As
workplace conditions vary, this information is intended to allow the user to make a better estimation of the
hazards and risks involved only.
Specifications were current at time of publication, but because of our policy of continuous improvement, JET
reserves the right to change specifications at any time and without prior notice, without incurring obligations.
JAT-501 Mini HVLP Spray Gun
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Setup and Assembly
Any missing parts or damage should be reported
immediately to your JET® distributor. Do not use a
damaged tool. Read this instruction manual
thoroughly for operation, maintenance and safety
instructions.
Box contents:
1 Spray gun
1 Gravity feed cup, 125cc
1 Spanner
1 Bristle brush
1 Operation and parts manual
1 Warranty card
Operation
1. Blow out air line to remove any dirt or
moisture, then connect air supply hose to
tool’s air inlet.
IMPORTANT: Connecting a quick-change
coupling directly to the tool is not
recommended, as vibration may cause the
connection to fail. Instead, add a leader hose
and install any quick-change couplings
farther down the line.
2. Unscrew cup lid and add fluid to be sprayed.
(Follow paint manufacturer’s instructions for
proper mixing.)
3. Set regulator to desired air pressure. (Refer
to gun’s rated maximum pressure).
4. Loosen air cap knurled ring and rotate air cap
horns to effect horizontal or vertical spray.
Retighten air cap.
Horizontal horns (as shown in Figure 1) will
produce vertical pattern for side-to-side
motion. Vertical horns produce horizontal
pattern used for top-to-bottom motion.
5. Squeezing trigger part way opens air valve.
Squeezing further retracts fluid needle, thus
releasing fluid where it is atomized by the air
flowing through air cap.
6. Rotate fluid control knob clockwise to
decrease flow of material, counterclockwise
to increase. Tighten locking knob to secure
setting.
7. Rotate fan control knob counterclockwise for
full, flat spray pattern; clockwise for narrower
pattern.
NOTE: To reduce overspray and obtain maximum
efficiency, always spray with the lowest possible
air pressure/fluid flow combination.
Figure 1
Spray gun movement
The gun should be held perpendicular to surface
being covered, and moved parallel with it at a
consistent pace. See Figure 2. The stroke should
be started before the trigger is pulled, and the
trigger released before the stroke is ended.
Distance between gun and surface should be 6 to
12 inches depending upon material and atomizing
pressure.
Deposited material should be even and wet. Lap
each stroke over the preceding stroke from 1/3 to
1/2, to obtain a uniform finish.
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Figure 2
Maintenance
Note: All parts on a spray gun should be screwed
in hand tight at first; this will avoid the possibility
of cross threading the parts. If parts cannot be
turned by hand easily, make sure you have the
correct parts, unscrew, realign and try again.
Never use undue force in mating parts.
All nozzles and needles are precision made – they
should be handled carefully. When changing to a
different nozzle size, make sure that complete
nozzle set is exchanged (air cap/nozzle/needle).
Adjust fluid control knob so that when gun is
triggered, air-flow occurs before fluid-flow.
Do not probe any holes in
nozzle with metal instruments, as damage to
spray gun can affect proper operation.
Cleaning
1. After use, remove cup and drain residual
material. Rinse cup with a cleaning solution
or water, depending upon material used.
Place cleaning solution into cup and install
on gun. Spray solution through the gun until
it sprays clear. Do NOT immerse the entire
gun in solvent.
2. Disconnect air hose from tool.
3. Remove air cap and clean. Make sure holes
in horns are clean.
4. Use solvent and the provided brush to
remove any deposits around fluid nozzle.
5. For more detailed cleaning, use provided
spanner to remove fluid control knob, fluid
nozzle, and needle (in that order). Clean
nozzle and needle with brush and solution.
Reassemble parts by reversing above order.
6. Periodically lubricate the gun. Use a light
machine oil (Air Tool Oil or SAE #10) on the
following areas. Do not use lubricants
containing silicone.
Fluid needle packing (to prevent needle
from sticking)
Air valve packing
Trigger pivot point
Threaded parts
Storage
Hang the spray gun by its hook when not in use,
to prevent leaks or blockages. Disconnect air
hose before storage.
Air system requirements
1. Use proper air hose size (refer to tool
specifications). The hose should be just long
enough to serve the working area. Excessive
hose length will cause pressure drop.
2. Make sure air compressor supplies clean,
dry air at correct CFM for tool.
3. Set air pressure according to tool
specifications.
and/or unclean air will shorten the tool’s
life and may create a hazardous situation.
4. Drain water from air compressor tank daily,
as well as any condensation from air lines.
Water in the air line may enter the tool and
cause damage.
5. Change filters on the air system on a regular
basis.
Excess air pressure
JAT-501 Mini HVLP Spray Gun
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6. Air-line pressure may be increased
accordingly to compensate for extra-long air
hoses (usually over 25 feet). Inside diameter
of hose should be minimum 3/8-inch.
General Air Tool
Information
If the air tool is not performing according to
specifications, the following are among the most
common causes. (See also “Troubleshooting”
section.)
Contaminated air such as a dirty air system
or water in the system.
Using wrong size tool for the job.
Poor maintenance practices, such as using
excessive air pressure or air volume.
Improper or no lubrication.
Air System Recommendations
Equip the air compressor intake with a
replaceable air filter that can be easily cleaned.
Use safety shut-off valves so air flow can be
stopped quickly in case of a line break.
When using multiple hoses, air hoses should be
larger than leader hose. Join multiple hoses
directly, rather than with quick connect fittings
which may cause pressure drops and tool power
reduction.
Use anti-whip devices across hose couplings to
prevent hose from whipping in the event of a hose
failure or coupling disconnect.
Always use moisture traps at the compressor for
the main distribution line. Use moisture traps on
each downline that is to be used for air tools.
Recycling
Protect the environment. Your tool contains
materials which can be recovered or recycled.
When its useful life has expired, please leave tool
at a specialized facility.
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Troubleshooting JAT-501 Mini HVLP Spray Gun
Any disassembly of the tool should be done by qualified service personnel. For problems not addressed
below, contact JET technical service at 800-274-6846.
Problem Possible cause Remedy
Correct normal pattern. No correction necessary.
Material bubbles or “boils”
in cup.
Dirty or damaged air cap.
Dirty or damaged fluid tip.
Pressure too high for material
viscosity being sprayed.
Dirty or distorted air horn holes. Rotate air cap 180-degrees:
One of the air horn holes
completely obstructed.
Air getting into paint stream.
Excess air blowing back into cup. Tighten fluid nozzle.
Rotate air cap 180-degrees:
If pattern is following air cap,
problem is in air cap. Clean and
inspect. If pattern does not correct,
replacement is necessary.
If pattern is NOT following air cap,
problem is with fluid tip. Clean and
inspect tip for dried paint, dirt or
damage. If pattern does not
correct, replacement is necessary.
Reduce air pressure.
Increase material viscosity.
Pattern may also be corrected by
narrowing fan size with spray width
adjuster control knob.
If pattern is following air cap,
problem is in air cap. Clean and
inspect the horn holes. If horn
holes are distorted, replacement is
necessary.
Check and tighten fluid needle
packing nut.
Tighten fluid nozzle.
Check fluid nozzle seat for
damage.
Check for poor gun-to-cup seating.
Check that cup is correctly
fastened on gun.
Check fluid nozzle seat.
Check for damaged fluid seat on
nozzle or seat on gun head.
JAT-501 Mini HVLP Spray Gun
11
Problem Possible cause Remedy
Gun leaks from fluid
nozzle.
Paint emerges from needle
packing.
Too much overspray. Gun too far away. Move gun closer to work surface.
“Orange peel” finish
(textured instead of
smooth).
Foreign substances between
fluid nozzle and needle.
Needle packing is damaged or
missing.
Excessive fluid. Reduce fluid flow.
Excessive air pressure. Reduce air flow.
Nozzle too large for project. Try smaller nozzle kit.
Insufficient air pressure for
proper atomization.
Fluid too thick. Thin the fluid and retry.
Disassemble and clean nozzle and
needle.
Replace packing.
Increase air flow.
Applying fluid at an angle. Apply perpendicular to work
surface.
Replacement parts
Service parts are listed on the following pages. To order parts or reach our service department, call 1-800274-6848 Monday through Friday, 8:00 a.m. to 5:00 p.m. CST. Please have the stock number and serial
number of your tool available when you call, so that we may serve you quickly and accurately.
JET
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#505501, JAT-501, Mini HVLP Spray Gun – exploded view
JAT-501 Mini HVLP Spray Gun
13
#505501, JAT-501, Mini HVLP Spray Gun – parts list
Index Part No.
Description
Qty
Index Part No.
Description
Qty
1 JAT501-01 Air cap assembly 1.0mm 1
2 JAT501-02 Fluid nozzle 1.0mm 1
3 JAT501-03 Plastic gasket 1
4 JAT501-04 Brass screw 1
5 JAT501-05 Seal 1
6 JAT501-06 Spring 1
7 JAT501-07 Gun body 1
8 JAT501-08 Fluid inlet 1
9 JAT501-09 Nylon cup and cover 125cc 1
10 JAT501-10 Fluid needle assembly 1.0mm 1
11 JAT501-11 Spring 1
12 JAT501-12 Fluid control knob 1
13 JAT501-13 Fan control assembly 1
14 JAT501-14 Fan control knob 1
15 JAT501-15 Screw M2.6x5 1
16 JAT501-16 Air inlet 1/4in. PS 1
17 JAT501-17 Air regulator assembly 1
18 JAT501-18 Pivot pin 1
19 JAT501-19 Pin with hole 1
20 JAT501-20 Trigger 1
21 JAT501-21 E-ring 2
22 JAT501-22 Air valve body 1
23 JAT501-23 Air valve shaft 1
24 JAT501-24 Air valve 1
25 JAT501-25 Spring 1
26 JAT501-26 Wrench 1
27 JAT501-27 Bristle brush 1
JAT501-RPK, Repair Kit, contains 5,6,11,21(2),24,25
JAT501-NK, Replacement Nozzle Kit 1.0mm, contains #1,2,10
Accessories for JAT-501:
505594, Nozzle kit 0.8mm (includes air cap, fluid nozzle and fluid needle)
505595, Nozzle kit 0.5mm (includes air cap, fluid nozzle and fluid needle)
505596, Spray Gun Cleaning Kit, 17pc.
505596
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JAT-501 Mini HVLP Spray Gun
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JET
16
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.jettools.com
JAT-501 Mini HVLP Spray Gun
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