Jet JNS-7033 Manual

Operating and Maintenance Instructions
1/4-inch Air Die Grinder
Model JNS-7033
WALTER MEIER (Manufacturing) Inc.
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-JNS7033
Ph.: 800-274-6848 Revision B1 04/2013
www.waltermeier.com Copyright © 2013 Walter Meier (Manufacturing) Inc.

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WARRANTY AND SERVICE
Walter Meier (Manufacturing), Inc., warrants every product it sells. If one of our tools needs service or repair, one of
our Authorized Service Centers located throughout the United States can give you quick service. In most cases, any
of these Walter Meier Authorized Service Centers can authorize warranty repair, assist you in obtaining parts, or
perform routine maintenance and major repair on your JET® tools. For the name of an Authorized Service Center in
your area call 1-800-274-6848.
MORE INFORMATION
Walter Meier is consistently adding new products to the line. For complete, up-to-date product information, check with
your local WMH Tool Group distributor, or visit jettools.com.
WARRANTY
This JET product carries a limited 90-DAY WARRANTY.
WHAT IS COVERED?
This warranty covers any defects in workmanship or materials subject to the exceptions stated below. Cutting tools,
abrasives and other consumables are excluded from warranty coverage.
WHO IS COVERED?
This warranty covers only the initial purchaser of the product.
WHAT IS THE PERIOD OF COVERAGE?
The general JET warranty lasts for the time period specified in the product literature of each product.
WHAT IS NOT COVERED?
This warranty does not cover defects due directly or indirectly to misuse, abuse, negligence or accidents, normal
wear-and-tear, improper repair or alterations, or lack of maintenance.
HOW TO GET SERVICE
The product or part must be returned for examination, postage prepaid, to a location designated by us. For the name
of the location nearest you, please call 1-800-274-6848.
You must provide proof of initial purchase date and an explanation of the complaint must accompany the
merchandise. If our inspection discloses a defect, we will repair or replace the product, or refund the purchase price,
at our option. We will return the repaired product or replacement at our expense unless it is determined by us that
there is no defect, or that the defect resulted from causes not within the scope of our warranty in which case we will,
at your direction, dispose of or return the product. In the event you choose to have the product returned, you will be
responsible for the shipping and handling costs of the return.
HOW STATE LAW APPLIES
This warranty gives you specific legal rights; you may also have other rights which vary from state to state.
LIMITATIONS ON THIS WARRANTY
WALTER MEIER LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR
EACH PRODUCT. EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OR MERCHANTABILITY AND
FITNESS ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG THE IMPLIED
WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
WALTER MEIER 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.
Walter Meier sells through distributors only. The specifications in Walter Meier catalogs are given as general
information and are not binding. Members of Walter Meier reserve 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 Walter Meier.

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1. Read and understand this entire manual before attempting assembly or operation.
2. Read and understand the warnings posted on the tool and in this manual. Failure to comply with all of
these warnings may cause serious injury.
3. Replace the warning labels if they become obscured or removed.
4. This die grinder is designed and intended for use by properly trained and experienced personnel only.
If you are not familiar 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 than its intended use. If used for other purposes, Walter Meier
(Manufacturing) Inc., disclaims any real or implied warranty and holds itself harmless from any injury
that may result from that use.
6. Always wear approved safety glasses/face shields while using this die grinder. (Everyday eyeglasses
only have impact resistant lenses; they are not safety glasses.)
7. Wear ear protectors (plugs or muffs) if the noise exceeds normal levels.
8. Use gloves if needed when operating the die grinder. Keep hands and body away from the working
area of the tool.
9. Some dust created by power sanding, sawing, grinding, drilling and other construction activities
contain chemicals known to cause 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 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 face or dust masks that are specifically designed to filter out microscopic
particles.
10. Do not operate this tool while tired or under the influence of drugs, alcohol or any medication.
11. Maintain proper balance and keep your footing at all times. Non-slip footwear or anti-skid floor strips
are recommended.
12. Before operating this die grinder, remove tie, rings, watches and other jewelry, and roll sleeves up
past the elbows. Remove all loose clothing and confine long hair.
13. Excessive air pressure and too much free rotation may decrease the life of the tool and may cause a
hazardous situation.
14. Check air hoses for wear, and keep them away from heat and sharp edges. Do not carry the die
grinder by the air hose.
15. Do not use this air tool near flammable objects or potentially explosive environments.
16. Do not leave a connected tool unattended. When not in use, disconnect tool from the air source.
17. Disconnect die grinder from air supply before making adjustments or changing accessories.
18. Keep work area clean and free of clutter.
19. Keep visitors a safe distance from the work area. Keep children away.
20. Give your work undivided attention. Looking around, carrying on a conversation and “horse-play” are
careless acts that can result in serious injury.
21. 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 safer.

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22. Repetitive motions and/or exposure to constant vibration can be harmful to hands and arms. Take
breaks and relax your hands occasionally during extended operation of the die grinder.
23. 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.
24. Use recommended accessories; improper accessories may be hazardous.
25. Maintain tools with care. Keep the die grinder clean and oiled for best and safest performance.
Specifications
Stock Number.............................................................................................................................JNS-7033
Collet Size (in.).....................................................................................................................................1/4
Horsepower.................................................................................................................................... 1/4 HP
Free Speed (no load) (RPM)........................................................................................................... 22,000
Required Air Pressure (PSI)...................................................................................................................90
Average Air Consumption (CFM).............................................................................................................4
Air Inlet Diameter (in.)................................................................................................................... 1/4 NPT
Air Hose Inside Diameter (in.)...............................................................................................................3/8
Vibration Value (m/s2)...........................................................................................................................5.4
Overall Length (in.)............................................................................................................................6-3/4
Noise Level (dB)....................................................................................................................................85
Net Weight (lbs.)................................................................................................................................. 1.44
The above specifications were current at the time this manual was published, but because of our policy of
continuous improvement, Walter Meier (Manufacturing) Inc., reserves the right to change specifications at
any time and without prior notice, without incurring obligations.
Record your purchase information here for quick reference:
Stock No.: Serial No.:
Purchased From: Date Purchased:

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Unpacking
The box should include 1 Air Die Grinder and 2
Wrenches. Any missing or damaged parts
should be reported to your JET®distributor.
Read this instruction manual thoroughly for
operation, maintenance and safety instructions.
Operation
1. The die grinder must be properly lubricated
before operating. See “Maintenance”
section for lubricating instructions.
2. Remove the protective cap from the air inlet,
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 quick-change couplings
farther down the line.
3. Loosen the collet nut using the two
wrenches on the flats of the collet nut and
spindle (Figure 1). Keep the wrench on the
spindle stationary while turning the wrench
on the collet nut.
4. Install a grinding point (not included) into the
collet and re-tighten the collet nut securely
using the wrenches.
5. Press forward on the safety lever and down
on the trigger (Figure 2). How far down the
trigger is pressed determines rotation speed
of the tool.
Maintenance
The die grinder should be lubricated daily (or
before each use) with air tool oil through the air
inlet. During continual operation, it should be re-
oiled every 1 to 2 hours. This can be done either
with an in-line oiler, or manually. If done
manually, proceed as follows:
1. Disconnect the air hose from the die grinder.
2. Place one or two drops of air tool oil* into
the air inlet (Figure 3).
[*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 may be used as
a substitute. Do not use detergent oil.]
3. Re-connect the air. Run the die grinder
without load for a few seconds to distribute
the oil throughout the tool.
Figure 1
Figure 2
Figure 3

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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 promotes rusting of internal
mechanisms, and always oil it before
storage.
Air Connection
1. Make sure that the air compressor supplies
clean air at the correct CFM for the die
grinder.
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 from the air compressor tank
daily, as well as any condensation from the
air lines. Water in the air line may enter the
tool and cause damage.
4. Change filters on the air system on a regular
basis.
5. Air line pressure should be increased
accordingly to compensate for extra long air
hoses (usually over 25 feet). Inside diameter
of the hose should be a minimum of 3/8”.
Troubleshooting
Trouble Probable Cause Remedy
Die Grinder does not
operate at normal
speed; or speed
remains constant as
trigger is pressed.
Air pressure is too low. Adjust air pressure to 90psi.
Air lines are twisted, or there is a
blockage in them. Untwist or clean out air lines.
Air compressor is malfunctioning, or is
not sufficient capacity for the tool. Replace air compressor.
Air regulator is malfunctioning. Have regulator repaired or replaced at
an authorized service center.
Stops operating.
No air pressure. Check air compressor and hoses.
Make sure compressor is set at 90psi,
and air lines are not twisted.
Trigger or throttle valve is
malfunctioning. Have throttle valve/trigger inspected
and repaired at an authorized service
center.
Torque is diminished. Air leakage. Check connections at the air inlet, o- rings, etc. Make adjustments/repairs
as needed.
Starts immediately as
soon as air is
connected without
trigger being pressed.
Throttle valve or trigger are
malfunctioning. Inspect and repair throttle valve and/or trigger.
Abnormal vibration
and/or excessive
heat develops in the
tool. Improper lubrication. Lubricate properly according to
instructions in this manual.

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To order parts or reach our service department, call 1-800-274-6848 Monday through Friday (see our
website for business hours, www.waltermeier.com). Having the Model Number and Serial Number of your
tool available when you call will allow us to serve you quickly and accurately.

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WALTER MEIER (Manufacturing) Inc.
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: [phone]
www.jettools.com
www.waltermeier.com