Operating and Maintenance Instructions
1/4-inch Air Angle Die Grinder
Model JNS-7034
JET
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-JNS7034
Ph.: 800-274-6848 Revision B2 05/2014
www.jettools.com Copyright © 2014 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 Co vered
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.
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 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 initia l p u rch a s e whe n 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 Informat io n
JET is constantly adding new products. For complete, up-to-date product information, check with your local distributor
or visit the JET website.
How S tat e Law A pplies
This warranty gives you specific legal rights, subject to applicable 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 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 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 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
Product Listing with Warranty Period
90 Days – Parts; Consumable items; Light-Duty Air Tools
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.
®
branded products are not sold in Canada by JPW Industries, Inc.
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1. Read and understand this entire manual before attempting assembly or operation.
2. Read and understand t he warnings posted on the tool and in this m anual. Failure to com ply with all of
these warnings may c ause serious i njury.
3. Replace the warning labels if they become obscured or remov ed.
4. This die grinder is designed and intended for use by properly t r ained and experienced personnel only.
If you are not famili ar with the proper and safe operation of an air operated die grinder, do not use
until proper training and knowledge have been obtained.
5. Do not use this tool for other t han its intended use. If used for other purpo se s, JET discl aims any real
or implied warranty and holds itself harmless f r om any injury that may result from that use.
6. Always wear approved saf ety glasses/f ace shiel ds while using thi s di e gri nder. (Ever yday ey eglasses
only have impact resi stant lenses; they are not safety gla sses.)
7. Wear ear protector s (plugs or muffs) if the noise exc eeds normal levels.
8. Use gloves if needed when operating the di e grinder. Keep hands and b ody away from the working
area of the tool.
9. Some dust created by power sanding, sawing, grinding, drilling and other construction activities
contains chemicals known to cause cancer, birth defects or other r epr oduc tiv e harm. Some examples
of these chemic als are:
• Lead from lead based paint.
• Crystalli ne sil ic a from bricks, cement and other m asonry pr oduc ts.
• Arsenic and chromium from chemically treated lum ber .
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 face or dust masks that are specifically designed to filter out microscopic
particles.
10. Do not operate this tool while tired or under the infl uence of dr ugs, alcohol or any medication.
11. Maint ain proper bal ance and keep your footi ng at all tim es. Non-sli p footwear or anti -skid f loor strips
are recommended.
12. Befor e operating thi s die grinder, remove tie, rings, watches and other jewelr y, and roll sleeves up
past the elbows. Remove all loose clothing and confine long hair.
13. Exc essive ai r pr essure and too m uc h free r otati on may decrease t he l if e of the t ool and m ay cause a
hazardous situat ion.
14. Check air hoses for wear, and keep them away from heat and sharp edges. Do not carry the die
grinder by the ai r hose.
15. Do not use this air tool near flammable objects or potentially explosiv e environments.
16. Do not leave a connected tool unattended. When not i n use, disconnect tool from the air source.
17. Disconnect di e gri nder from air supply before maki ng adjust ments or changing accessories.
18. Keep work area clean and fr ee of clutter.
19. Keep visit or s a safe di stanc e from the work area. Keep children away.
20. Giv e your work undivi ded attention. Looki ng around, carryi ng on a conversati on and “horse-play” ar e
careless acts that can r esul t in serious injury.
21. Do not f orce a tool or attachment to do a j ob for which i t was not designed. The ri ght tool will do the
job better and saf er .
22. Repetitiv e moti ons and/or ex posure to constant vibration can be har mful to hands and arms. Take
breaks and relax your hands occasionally during ex tended operation of the di e gri nder .
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23. Compr essed air can be harmf ul if directed toward sensi tive ar eas of the body, and m ay propel small
particles caught in the air stream. Exercise proper c aution.
24. Use recommended accessories; improper accessories may be hazardous.
25. Maintain t ools with c ar e. Keep the die grinder clean and oiled for best and safest perf ormanc e.
Specifications
Stock Number............................................................................................................................. JNS-7034
Collet Size (in.) ..................................................................................................................................... 1/4
Free Speed (no load) (RP M ) ........................................................................................................... 20,000
Required Air Pr essure (PSI)................................................................................................................... 90
Average Air Consumption (CFM) ............................................................................................................. 4
Air Inlet Diameter (in.) ................................................................................................................... 1/4 NPT
Air Hose Inside Diameter (in.) ............................................................................................................... 3/8
Vibration V alue (m/ s
Overall Lengt h (in.) ............................................................................................................................ 6 -1/4
Noise Level (dB) .................................................................................................................................... 85
Net Weigh t (lb s.) ...................................................................................................................................... 1
The above specifications were current at the time this m anual was published, but because of our policy of
continuous impr ov ement, JET reserves the ri ght to change specifications at any tim e and wit hout prior
notice, without incurring obligations.
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) ........................................................................................................................... 2.2
Record your purchase information here f or qui c k ref er ence:
Stock No.: Seri a l N o .:
Purchased From : Date Purchased:
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Unpacking
The box should incl ude 1 Air Die Grin der and 2
Wrenches. Any missing or damaged parts
should be reported to your JET
Read this instruction manual thoroughly for
operation, maintenance and safety instr uc tions.
® distributor.
Operation
1. The die grinder m ust be properly lubri cated
before operating. See “Maintenance”
section for lubricating instructions.
2. Remove t he protective c ap from the air inlet
(see Figure 2), and connect the air supply
hose. Make sure the air pressure is set to
90psi.
IMPORTANT: Connecting a quick-change
coupling directly to the Die Grinder is not
recommended, as vibration may cause the
connection to fail. Instead, add a leader
hose and install any qui ck-change c oupli ngs
farther down the li ne.
3. Loosen the collet nut using the two
wrenches on the flats of the collet nut and
spindle (Figur e 1). Keep the wrench on the
spindle stationary while turning the wrench
on the collet nut.
4. Install a gr inding point (not included) into the
collet and re-tighten the collet nut securely
using the wrenches.
5. Press forward on the saf ety lever and up on
the trigger (Figure 2). How f ar up the tri gger
is pressed determ ines rotati on speed of t he
tool.
Maintenance
The die grinder should be lubricated daily (or
before each use) wit h air tool oil through t he air
inlet. Dur ing c ontinual operat ion, it shoul d be reoiled every 3 to 4 hours. Thi s can be done either
with an in-line oiler, or manually. If done
manually, pr oc eed as follows:
1. Disconnect the air hose fr om the die grinder.
2. Place four or five drops of air tool oil* into
the air inlet (Fi gur e 3) .
Figure 1
Figure 2
[*NOTE: Air tool oil not provided. It may be
purchased from your JET dealer, or is
available at most major hardware and tool
stores. SAE #10 weight oil or sewing
machine oil may be used as a substitute. Do
not use detergent oi l.]
Figure 3
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3. Re-connect the air. Run the die grinder
without load f or a f ew seconds to distri bute
the oil throughout the tool.
4. When you are finished operating the die
grinder, before storing it disconnect the air
hose and place 4 or 5 drops of air tool oil
into the air inlet; re-connect the air and run
the tool for a few seconds to distribute the
oil.
5. Avoid storing the grinder in very humid
locations which prom otes rusting of internal
mechanisms, and always oil it before
storage.
Air Connection
1. Make sure that the ai r compressor suppli es
clean air at the correct CFM for the die
grinder.
Troubleshooting
2. Set air pressure to 90 psi.
Excess air pressure and/or
unclean air will shorten the tool’s life and
may create a hazardous situation.
3. Drain the water f r om the air c om pr essor tank
daily, as well as any conde nsation from t he
air lines. W ater in the air line may ent er the
tool and cause dam age.
4. Change filters on the air sy stem on a regular
basis.
5. Air line pressure should be increased
accordingl y to compensate f or ext ra long ai r
hoses (usually over 25 feet). I nsi de diameter
of the hose should be a minim um of 3/8”.
Trouble Probable Cause Remedy
Air pressure is too low. Adjust air pressure to 90p si .
Die Grinder does not
operate at normal
speed.
Stops operating.
Starts immediately as
soon as air is
connected without
trigger being pr essed.
Air lines are twisted, or there is a
blockage in them .
Air compressor is malfunctioning, or is
not suffici ent capac ity for the tool.
Air leakage.
No air pressure.
Trigger or thr ottl e v alv e is
malfunctioning.
Throttle v alv e or tri gger ar e
malfunctioning.
Untwist or clean out air lines.
Replace air compr essor.
Check connections at the air inlet, orings, etc. Mak e adjustm ents/repairs
as needed.
Check air compressor and hoses.
Make sure compressor is set at 90psi,
and air lines are not twisted.
Have throttle valve/trigger inspected
and repaired at an authorized service
center.
Inspect and repair throttle valve
and/or trigger.
Abnormal vibration
and/or excessive
heat develops in the
tool.
Improper l ubri c ation.
Lubricate pr oper ly ac c or ding to
instructions in this manual.
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To order parts or reach our service department, call 1-800-274-6848 Mon day through Friday (see our
website for business hours). Hav ing the Model Number and S erial Number of your tool availabl e when
you call will all ow us to serve y ou quic kl y and ac c urately.
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427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.jettools.com
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