Pneumatic Mini HVLP Spray Gun
#505501, JAT-501
Operation & Parts Manual
M-505501
Edition 1
02/2015
JET
427 New Sanford Road
LaVergne, T N 37086
Ph.: 800- 274- 6848
www.jettools.com
Copyright © 2015 JET
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 duration 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 the 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.
Warrant y 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 further 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 Centers 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 applicable state law.
Limitations on This War ra nt y
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 ARE
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 LI A B L E FOR DEA TH, INJURIES TO PERS O NS O R PROPERTY , OR F OR INCIDE NTA L ,
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 website 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
sold in Canada by JPW I ndustries, Inc.
Product Listing with Warranty Period
90 Days
1 Year – Motors; Machine Accessories; Heavy-Duty Air Tools; Pro-Duty Air Tools
2 Year – Metalworking Machinery; Electric Hoists, Electric 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.
Parts; Consumable items; Light-Duty Air Tools
®
branded products are not
2 JAT-501 Mini HVLP Spray Gun
Safety warnings
General air tool warnings
1. Read and understand this entire manual
bef ore attempti ng assembl y or op erat i on .
2. Read and un derstan d all warn ings post ed on
the tool and in this m anual . Fai lure t o c ompl y
with all of th ese warni ngs may caus e seri ous
injury.
3. Replace warning labels if they become
obscured or remo ved.
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. Al ways wear app roved saf ety gl ass es or fac e
shield while using this tool. (Everyday
eyeglasses only have impact resistant lenses;
they ar e not safet y glas ses.)
6. Wear ear protectors (plugs or muffs) if the
noise exceeds safe levels.
7. Wear gloves and protective clothing if
oper ation pr oduces sparks or fl ying p articles.
Gloves should be tight-fitting, withou t frayed
fing ers or hanging threads . Keep han ds and
body aw ay from the work ing area of to ol.
8. Some dust created by power sanding, sawing,
grinding, drilling and other construction
acti viti es c ontai ns c hem ic als know n t o c aus e
cancer, birth defects or other reproductive
harm. Some examples of these chemicals
are:
• Lead from lead based paint.
• Crystalline silica from bricks, cement and
other m as onry prod uc ts .
• Arsenic and chromium from chemically
treated lumber.
Your risk of exposure varies, depending on
how often you do this t yp e of w ork. To reduc e
your e xposure to t hese chemic als, wor k in a
well-ventilated area and work with approved
safety equipmen t, such as face or dust masks
that are specifically designed to filter out
microscopic particles.
9. Do not operate an air tool continually at full
throttle withou t a w ork l oad on the tool .
10. The air tool must be properly lubricated before
oper atin g.
11. 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.
12. Do not operate air tool without its guards in
place. Do not modify the tool.
13. Do not operate this tool whi le tired or und er
the influence of drugs, alcohol, or any
medication.
14. Adopt a comfortable posture with proper
balance, and maintain secure footing at all
times. Non-slip footwear or anti-skid floor
strips ar e recommend ed.
15. Do not wear loose clothing or jewelry. Confine
long hair.
16. Excessive air pressure and too much free
rotati on may decr eas e lif e of th e tool an d may
caus e a haz ar d ous sit u at i on.
17. Check air hoses for wear, and keep them
away f rom heat and s harp ed ges. R epair or
replace damaged air hose immediately. Do
not carry tool by the air hose.
18. Air hose may cause tripping hazards; keep
hose away from traffic areas.
19. D o not us e this tool n ear flammabl e objects,
or in potentially explosive environments. Do
not use near live electrical wires.
JET 3
20. Do not use power tools in damp or wet
locat ion, or expose t hem t o rain. Keep w ork
area well lighted.
21. Do not leave a connected tool unattended.
When not in use, disconnect tool from air
source.
22. Shut off air supply and discharge any residual
pressure from tool before removing hose,
making adjustments, changing accessories,
or storing tool.
23. Make sure tool is switched off, and your finger
off the trigger, before connecting to air supply.
24. Remo ve adj ustin g keys and wr ench es bef or e
turnin g on t ool.
25. Keep visitors a safe distance from the work
area. Keep children away.
26. Give your work undivided attention. Looking
around, carrying on a conversation and
“horse-play” are careless acts that can result
in serious injury.
27. D o not forc e a tool or att achm ent to do a job
for which it was not designed. The righ t tool
will do the job better and more safely.
28. 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 dis comf ort or f at ig u e.
29. Compressed air can be harmful if directed
toward s ensiti ve ar eas of the bod y, and may
propel small particles caught in the air stream.
Exerc ise proper c auti on.
30. Use only recommended accessories;
impr op er access ories may be haz ar d ous .
31. Maint ain t ools with care. Keep air t ool clean
and oiled for best and safest performance.
32. Do not use combustible gases, carbon
dioxide, oxygen or any bottled gas as an air
source f or the tool. Th es e can present r isk of
explosion and serious injury.
33. Do not lubricate the tool with combustible
liquids, such as kerosene, diesel or jet fuel.
34. Do not dispose of this tool with normal
household waste. Never dispose of the air tool
into fire.
Specific warnings for Spray Guns
35. Solvent and paint fumes can ignite causing an
explosion. Exercise caution and use
appropriate ventilation systems. It is the
resp onsi bilit y of the owner to un der st and and
comply with any codes or regulations
conc er ni ng h az ar d ous m at er i als .
36. Wear appropriate eye and respiratory
protec ti on when usi ng th is spray gun.
37. Read, understand and follow all safety
warnings by the material and solvent
manufacturer.
38. D o not spr ay fl ammabl e mater ials n ear open
flames, pilot lights or other sources of ignition.
Familiarize yourself with the following safety notices used in this manual:
Th is means t hat if preca utions are not he eded, it may resu lt in serio us, or ev en
fatal, injury.
This means that if precautions are not heeded, it may result in minor injury and/or
possible tool damage.
4 JAT-501 Mini HVLP Spray Gun
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
oper ating proced ures, m aintenanc e procedur es and parts breakd own. Your t ool has been d esigned an d
constr uct ed to pr ovi de c onsis tent, lon g-ter m op erati on if used in acc ordanc e wi th the ins tr ucti ons set f orth
in this docu ment.
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
oper ati on, safet y of op erator and b yst an d ers sh ou ld be fir s t priority.
If th ere are ques ti ons or comment s , p l eas e contact your loc al s u pp li er or JET. JET can also be reac h ed 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 5
Tool speci fications
Model number JAT-501
Stock number 505501
Gun type HVLP (High Volume Low Pressure)
Feed type Gravity
Cup capacity 125cc
Fluid n oz zl e provided 1.0 mm
Fluid ou tp ut 90 cc/mi n
Maximum fan pattern size 140 mm
Air cons u mption 3.8 CFM at 28 PSI (2 b ar )
Working press ure 15-28 PSI (1.05-2 b ar)
Air Inlet 1/ 4 in. PS
Fluid in l et M14 x 1.0 P
Overall length 9.84 in. (249.94 mm) with cap; 6.69 in. (169.93 mm) without cap
Body mater ial Die casting
Fluid ti p an d need le mater i al Stainl es s st eel
Net wei ght , gun body 0.64 lb (0. 29 kg)
Net wei ght , access ori es 0.35 lb (0. 16 kg)
Shipping weight 1.32 lb (0.6 kg)
1
The specif ied val ues ar e emiss ion l evels an d ar e not nec ess aril y to be seen as s afe oper atin g levels . As
workpl ac e condit i ons var y, this informat ion is int end ed to al low the us er to mak e a better esti mati on of th e
hazards and risks invo lved 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.
6 JAT-501 Mini HVLP Spray Gun
Setup an d A ss em bly
Any missing parts or damage should be reported
immediately to your JET
damaged tool. Read this instruction manual
thorou g hl y for oper at i on , m aintenance and safety
instructions.
Box contents :
1 Spray gun
1 Gravity feed cup, 125cc
1 Spanner
1 Bristle brush
1 Operati on and p art s m anu al
1 Warranty card
®
distr ibutor. Do not use a
Operation
1. Blow out air line to remove any dirt or
moisture, then connect air supply hose to
tool’s air in l et.
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.
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.
2. Unscrew cup lid and add fluid to be sprayed.
(Follow paint manufacturer’s instructions for
proper mixing.)
3. Set regul ator to desir ed air press ure. (R efer
to gun’s rated maxi m u m pressur e).
4. Loosen air cap knurled ring and rotate air cap
horns to effect horizontal or vertical spray.
Retigh ten air cap.
Horiz ont al h orns ( as s h own i n F igur e 1) wil l
produce vertical pattern for side-to-side
motion. Vertical horns produce horizontal
pattern used for top-to-bottom motion.
5. Squeez ing tr igger p art way op ens air valve.
Squeez in g fur ther r etrac ts f lui d need le, t hus
releas i ng flu id w h er e it is atom iz ed b y the air
flowing through air cap.
6. Rotate fluid control knob clockwise to
decr ease fl ow of mat erial, c ounterc lock wise
to incr ease. Tight en locking knob to secur e
setting.
Figure 1
Spray gun movement
The gun shou ld be held p erpendic ular t o surf ace
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.
Depos ited mat erial sh ould be ev en and wet. Lap
each stroke over the preceding stroke from 1/3 to
1/2, to obtain a uniform finish.
JET 7
Figure 2
it spr ays cl ear. D o NOT imm erse the entir e
gun in solvent.
2. D is c onn ec t air h os e f r om tool.
3. Remove air cap and clean. Make sure holes
in horns are cl ean .
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
nozzl e an d needle with brush and solution.
Reassemble parts by reversing above order.
6. Periodically lubricate the gun. Use a light
machin e oil (Air Tool Oil or SAE #10) on t h e
following areas. Do not use lubricants
containing silicone.
• Fluid needle packing (to prevent needle
from sticking)
• Air valve packing
• Trigger pivot point
• Threaded parts
Maintenance
Note: All parts on a spray gun should be screwed
in hand ti ght at first; this will avoid the p ossibilit y
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 mat in g part s .
All nozzles and needles are precision made – they
should be handled car efully. When changing t o 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 bef ore fluid-flow.
Do not probe any holes in
nozzle with metal instrumen ts, as damage to
spray gun can affe ct prop er operation.
Cleaning
1. After use, remove cup and drain residual
mater ial. R ins e c up wit h a c lean ing s olut ion
or water, depending upon material used.
Plac e cleani ng solut ion int o cup an d instal l
on gun. Spr ay solu tion thr ou gh th e gun un til
Storage
Hang th e spr ay gun b y its h ook wh en not i n us e,
to prevent leaks or blockages. Disconnect air
hose before storage.
Air system requi rements
1. Use proper air hose size (refer to tool
specifications). The hose should be just long
enough to serve the working area. Excessive
hose len gt h wil l c ause pressur e drop.
2. Make sure air compressor supplies clean,
dry air at correct CFM for tool.
3. Set air pressure according to tool
specifications.
Excess air pressure
and/or un clean air will sh orten the tool’ s
life and may create a hazardous situation.
4. Drain water f rom air com press or tan k dail y,
as well as any condens ation from air lin es .
W ater in the air lin e may enter the t ool and
cause damage.
5. C h ang e f ilt ers on th e air syst em on a reg ul ar
basis.
8 JAT-501 Mini HVLP Spray Gun
6. Air-line pressure may be increased
accor di n gly to compensate f or ext ra-long air
hoses (usually over 25 feet). Inside diameter
of hos e sh oul d b e mini m um 3/8-inc h .
General Air Tool
Information
If the air tool is not performing according to
specif ications , th e foll owing are am ong t he most
common causes. (See also “Troubleshooting”
section.)
• Contam inated air such as a dirty air s ystem
or water in the system.
• Using wrong size tool for the job.
• Poor maint enanc e pract ices, such as us ing
excessive air pressure or air volume.
• Improper or no lubrication.
Use safety shut-off valves so air flow can be
stopped quickly in case of a line break.
W hen using multip le hos es, air hoses shou ld be
larger than leader hose. Join multiple hoses
directly, rather than with quick connect fittings
which m ay caus e pressure dr ops and tool power
reduction.
Use anti-whip devices across hose couplings to
prevent hose from whipping in the event of a hose
failur e or c oup li ng dis connec t.
Always us e m oist ure tr aps at th e c ompr ess or f or
the main distribu tion line. Use moist ure 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.
W hen its us eful life has expired, please leave tool
at a specialized facility.
Air System Recommendations
Equip the air compressor intake with a
replaceable air filter that can be easily cleaned.
JET 9
Troubleshooting JAT-501 Mini HVLP Spray Gun
Any dis ass embly of the tool sh ould be don e by qualif ied servic e personnel. F or problems not ad dressed
below, contact JET technical service at 800-274-6846.
Problem Possible cause Remedy
Correct normal pattern. No correction necessary.
Dirty or damaged air cap.
Dirty or damage d fluid tip.
Pressure too high for material
viscosity being sprayed.
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 doe s not
correct, replacement is necessary.
Reduce air pressu re.
Incr eas e m aterial vis cosity.
Pattern may also be corrected by
narrowing fan size with spray width
adjuster control knob.
Material bubble s or “boils”
in cup.
Dirt y or dis torted air horn holes . Rotate air cap 180- d egrees:
One of th e a i r h orn holes
completel y obs truc ted.
Air getting int o pain t stream.
Excess air blowing back into cup. Tighten fluid nozzle.
If pattern is following air cap,
problem is in air cap. Clean and
inspect the horn holes. If horn
holes are distort ed, replac em en t is
necessary.
Check and tighten fluid needle
packin g nut.
Tighten fluid nozzle.
Check fluid nozzle seat for
damage.
Check for poor gun-to-cup seating.
Che ck that cup is correctly
fast en ed on g un.
Check fluid nozzle seat.
Check for da maged fluid seat on
nozzle or seat on gu n he ad.
10 JAT-501 Mini HVLP Spray Gun
Problem Possible cause Remedy
Gun leaks from fluid
nozzle.
Paint em erges fr om n eed le
packing.
Too much oversp r ay. Gun too far away. Move gun closer to w ork s urface.
“Orange peel” finish
(textured instead of
smooth).
Foreign substances between
fluid n oz zl e an d need l e.
Needle packing is damaged or
missing.
Excessive fluid. Reduce fluid flow.
Excess ive air pressure. Reduc e air fl ow .
Nozzle too large for project. Try smaller nozzle kit.
In sufficient air pressure for
prop er atomization.
Fluid too thick. Thin the fluid and retry.
Applying fluid at an angle. Apply perpendicular to work
Disassemble and clean nozzle and
needle.
Replace packing.
Incr eas e air f l ow.
surface.
Replac em e nt par t s
Service parts are listed on the following pages. To order parts or reach our service department, call 1-800274-6 848 Mon day thr ough Fr iday, 8: 00 a.m. to 5:00 p. m. CST. P leas e have the st ock num ber an d serial
number of y our t ool available when you c all, so that we m ay serve yo u quickly an d acc uratel y.
JET 11
#505501, JAT-501, Mini HVLP Spray Gun – exploded view
12 JAT-501 Mini HVLP Spray Gun
#505501, JAT-501, Mini HVLP Spray Gun – parts list
Index Part No. Description Qty
1 JAT501-01 Air cap assembly 1.0mm 1
2 JA T5 01-02 Fl ui d nozzl e 1. 0m m 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
Index Part No. Description Qty
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, Nozzl e kit 0.8mm (includes air cap, flui d n oz zl e and f lui d n ee dle)
505595, Nozzl e kit 0.5mm (includes air cap, flui d n oz zl e and f lui d n ee dle)
505596, Spray Gun Cleaning Kit, 17pc.
505596
JET 13
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14 JAT-501 Mini HVLP Spray Gun
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JET 15
16 JAT-501 Mini HVLP Spray Gun
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.jettools.com
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