Pneumatic Hammer
#505900, JAT-900
#505901, JAT-901
#505902, JAT-902
JAT-901 shown
Operation & Parts Manual
M-505900
Edition 2
06/2015
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, INJURI E S TO PERSONS OR 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; Machi n e Accesso r i e s
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 Accessor i e s;
Shop Tools; Warehouse & Dock products; Hand Tools; Air 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
®
branded products are not
2 JAT-900,901,902 Pneumatic Hammer
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.
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 .
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.
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 Air Hammer
35. If you are not familiar with the proper and safe
oper ation of an air hammer, d o not use unt il
proper training and knowledge have been
obtained.
36. Always operate air hammer with chisel
secured and held f irm l y ag ains t workpi ec e.
37. Make sure speed rating of chisel/accessory
matches or exceeds speed rating of air
hammer.
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-900,901,902 Pneumatic Hammer
About this manual
This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model
JAT-900, JAT-901 and JAT-902 Pneumatic Hammer. This manual contains instructions on safety
prec autions , gener al operatin g proc edures, m ainten ance pr ocedur es and parts breakd own. Your t ool has
been d esig n ed and c onstr uct ed to pr o vid e c onsist ent, lon g-t erm op eration if us ed i n ac c ordanc e w ith t h e
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
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 comments, pl eas e contact you r local su pp lier or J E T . J E T 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-900
Stock number 505900 505901 505902
Retainer style Coil spring Coil spring Coil spring
Strok e len gt h 1-5/8 in. 2-5/8 in. 3-1/ 2 in.
Bore size 3/4 in. 3/4 in. 3/4 in.
Shank size 0.401 in . Parker 0.401 in. Parker 0.401 in. Parker
Blows p er min ut e 5000 3200 2000
Average air consumption 3 CFM 3 CFM 3 CFM
Air inlet 1/4 in. NPT 1/4 in. NPT 1/4 in. NPT
Air hose inside diameter 3/8 in. 3/8 in. 3/8 in.
Required air pres s ure 90 psi (62 1 kP a) 90 psi (62 1 kP a) 90 psi ( 62 1 kPa)
Vibration val u e 12.6 m/s2 8.4 m/s2 11.8 m/s2
Nois e lev el 1 104 dB(A) 108 dB(A) 112 dB(A)
Speed setting Variable Variable Variable
JAT-901
JAT-902
Grip Pistol style Pistol style Pistol style
Overall Length 5-1/4 in. (133.4 mm) 6-3/4 in. (171.5 mm) 9 in. (228.6 mm)
Housing ma terial Aluminum Alum inum Aluminum
Net weight 3.28 lb. (1.49 kg) 4. 2 1 lb. (1 .9 1 kg) 4.54 lb. (2.06 kg)
Shipping weight 3. 5 7 lb. (1 .6 2 kg) 4.52 lb. ( 2.05 kg) 4.85 lb. (2.20 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-900,901,902 Pneumatic Hammer
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 ai ntenance and s afety
instructions.
®
distr ibutor. Do not use a
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.
5. Adjust speed with air regulator knob.
Box contents :
1 Pneumatic hammer
1 Spring retainer
4 Chisels
1 Operat i on and p ar ts m anu al
1 Warranty card
Operation
The air hammer must be
properly lubricated before operation. See
“Lubricati on” se ctio n.
6. Hold air hamm er with both hands, an d pr ess
chisel blade against target surface. Press
trigger to begin hammering ac tion.
7. Release trigger to stop air hammer.
Four chisels are provided with the air hammer
(Figure 2).
Figure 2 (p/n JSG-1304)
A. Flat chisel
B. Nut splitter
C. Tapered punch
D. Panel cutter
Figure 1
1. Insert chisel shank into cylinder of air
hammer. Slide spring retainer over chisel
and screw it al l the way ont o cylinder; use
rear tab for lever age. Make sure front c oil of
spring surrounds chisel (inset, Figure 1).
2. Pull on chisel to verify it is secure.
3. Remove protecti v e cap from air i nl et (Figur e
1). If an in-line oil er is not bei ng used, add 4
or 5 drops of air tool oil (not included) into the
air inlet.
4. Blow out air line to remove any dirt or
moisture, then connect air supply hose to
tool. Set air pressure to 90 psi.
Maintenance
Lubrication
The air hammer should be lubricated daily (or
before each use) with air tool oil through the air
inlet. Durin g conti nual op erati on, it s hould b e reoiled every 1 to 2 hours. This can be done with an
in-line oiler, or manually. If done manually,
proc eed as f oll ows :
1. D is c onn ec t air h os e f r om tool.
2. Pl ace 4 or 5 dr ops of air tool oil into air in l et
(Figure 1).
NOTE: Air tool oil not provided; it is available
at most major hardware and tool stores. SAE
#10 oil or s ewing mach ine oil may b e us ed
as a substitute. Do not use detergent oil.
JET 7
3. Re-connect air. Run air hammer at low
throttle without load for a few seconds to
distri bu te the oil thr oug hout tool.
4. When finished operating air hammer,
disconnect air hose. Wipe off housing with a
dry cloth. Place 4 or 5 drops of air tool oil into
air inl et; re-c onn ec t air and r un t h e t ool for a
few s ec onds to distr i but e the oi l. Dis connec t
air.
• C ontamin ated air suc h as a dirty air system
or water in the system.
• Using wrong size tool for the job.
• P oor main tenanc e pr actic es, suc h as usin g
excess i ve air press ure or air volume.
• Improper or no lubrication.
Rule of Th um b
Storage
Avoid storing the air hammer in very humid
locations which promotes rusting of internal
mechan isms. A lways oil t he tool and disc onnect
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 the tool.
3. Set air pressure to 90 psi.
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.
6. Air-line pressure may be increased
accor di n gly to compensate f or extra- l ong 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.)
If it takes more than 8 seconds to tighten or loosen
a bolt or nut with an air impact wrench at
maxim um settin g, the air wrenc h is t oo smal l or
the air compressor CFM is not powerful enough
for the job. Continued use in either capacity will
cause damage to the tool.
Tool Pressure
JET Air Tools oper ate on 70-t o-100 psi ( pounds
per square inch) air pressure measured at the tool
when the tool is operating. Set tool to 90 psi
unless indicated otherwise. Pressure in excess of
100 psi will shorten the life of the tool.
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.
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 distr ib ut ion line. Use mois ture traps an d
in-lin e oilers on eac h down line th at is to be used
for air tools. (See Figure 3). Place oiler as close to
air tool as possible f or best lubric ati on.
8 JAT-900,901,902 Pneumatic Hammer
Lubrication
Recycling
Use a lig ht oil contai ning rust in hibitors, such as
SAE #10. Many JET air tools have integral oil
reservoirs, which should be kept filled when in-line
oilers ar e not us ed.
If greasing is required, use a grease that is highly
water res ist ant f or t he f r ont c ase c omp onen ts on
air imp act wr enc h es , gr in d er s and s an d ers.
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.
Figure 3
Recommended arrangement of air piping and air line system
JET 9
Troubleshooting JAT-900/901/902 Pneumatic Hammer
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
Tool will not st art . Air valv e cl os ed or obstruc ted. Open val v e; cl ear an y obstruct i ons .
Exc essive or abn orm al
vibration.
Starts im m ed i ately as soon
as air is connected.
Loss of power; erratic
action, or s p eed remains
const ant when turni ng
regulator.
Housing becomes
excessively hot.
Sever e air l eak ag e.
(Note: M inim a l escape of
air is oft en n or m al f or air
tools.)
Dirt or gu m d eposits on
components.
Intern al c om ponents are worn. Repl ac e w orn c om p onents.
Trigg er i n op erable. Cl ean tri gger mechanism to ens ure
Improper lubrication. Lubricate according to instructions
Throttle or trigger is
malfunctioning.
Low air pressure. Verify compressor has proper CFM
Moisture or obstr uction in air
hose.
Impr op er size of air tr ans m is s i on
lines, h oses, fitti ngs , or
couplings.
Dirt or gu m d eposits on
components.
Regulator is malfunctioning. Replace regulator.
Improper lubrication. Lubricate according to instructions
Worn components. Replace components as needed.
Air valv e obs truct ed or dam aged. Clean or rep l ac e.
Housi ng loose or damag ed. T i ght en or r ep l ac e as n eeded.
Flush tool wit h gu m s olvent.
If problem persists, disassemble,
clean and lubricate internal parts.
free movement. Replace
mechanism if needed.
in this manual.
Inspect and repair throttle and/or
trigger.
rating for tool.
Che ck compressor regu lator
setting; set air pressure to 90 psi.
Set regulator knob on tool to
maximum setting.
Check for loose connections.
Air supply must be clean and dry.
Clean ou t air h os e(s ) and r em ov e
any ki nks or b ends .
Use appr opriat e-si z ed air
lines/hoses.
Verif y pr op er f itt in gs / couplin gs .
Flush tool wit h gu m s olvent.
Check and cl ean air filt er on
compress or.
Clean e xt er n al areas of tool . If
problem persists, disassemble,
clean and lubricate internal parts.
in this manual.
10 JAT-900,901,902 Pneumatic Hammer
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 s er v e yo u quickly an d acc u r ately.
JET 11
#505900, JAT-900 Pneumatic Hammer – parts breakdown
Index Part No. Description Qty
1 JAT900-01 Housing 1
2 AH-18 Regulator 1
3 AH-4 Hose adaptor 1
4 AH-8 Trigger 1
5 AH-6X Throttle valve stem 30.6mm 1
6 AH-17 O-Ring 7.8x1.9 2
7 AH -9 Steel ball seat 1
8 AH-5 Throttle spring 1
RBK-0101R Rebuild Kit, contains 5,7,8,11,15
12 JAT-900,901,902 Pneumatic Hammer
Index Part No. Descript ion Qty
9
AH-7
11 AH-10A Valve assembly 1
13 AH-2X Pin (for trigger) 3x14 1
14 AH-3X Pin (for regulator) 3x16 1
15 AH-15-1A Cylinder assembly (incl. piston) 1
17 AH-19 Valve seat 1
18 J0101S Quic k change spring retai ner 1
JSG-1304 Se t of 4 ch i sels 1
O-Ring 2x1.5
2
#505901, JAT-901 Pneumatic Hammer – parts breakdown
Index Part No. Description Qty
1 JAT901-01 Housing 1
2 AH-18 Regulator 1
3 AH-4 Hose adaptor 1
4 AH-8 Trigger 1
5 AH-6X Throttle valve stem 30.6mm 1
6 AH-17 O-Ring 7.8x1.9 2
7 AH-9 Stee l ball seat 1
8 AH-5 Throttle spring 1
RBK-0204R Rebuild Kit, contains 5,7,8,11,15
Index Part No. Descript ion Qty
9 AH-7
11 AH-10A Valv e as sembly
13 AH-2X Pin (for trigger) 3x14 1
14 AH-3X Pin (for regulator) 3x16 1
15 AH-15-2A Cylinder assembly (incl. piston) 1
17 AH-19 Valve seat 1
18 J0101S Quic k change spring retai ner 1
JSG-1304 Se t of 4 ch i sels 1
O-Ring 2x1.5
JET 13
2
1
#505902, JAT-902 Pneumatic Hammer – parts breakdown
Index Part No. Description Qty
1 JAT901-01 Housing 1
2 AH-18 Regulator 1
3 AH-4 Hose adaptor 1
4 AH-8 Trigger 1
5 AH-6X Throttle valve stem 30.6mm 1
6 AH-17 O-Ring 7.8x1.9 2
7 AH-9 Stee l ball seat 1
8 AH-5 Throttle spring 1
RBK-0304R Rebuild Kit, contains 5,7,8,11,15
14 JAT-900,901,902 Pneumatic Hammer
Index Part No. Descript ion Qty
9 AH-7
11 AH-10A Valv e as sembly
13 AH-2X Pin (for trigger) 3x14 1
14 AH-3X Pin (for regulator) 3x16 1
15 AH-15-3A Cylinder assembly (incl. piston) 1
17 AH-19 Valve seat 1
18 J0101S Quic k change spring retai ner 1
JSG-1304 Se t of 4 ch i sels 1
O-Ring 2x1.5
2
1
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JET 15
16 JAT-900,901,902 Pneumatic Hammer
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.jettools.com
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