Jet JNS-4031KL Manual

Operating and Maintenance Instructions
3/8-inch Reversible Air Drill
Model JNS-4031KL
JET
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-JNS4031KL
Ph.: 800-274-6848 Revision A1 05/2014
www.jettools.com Copyright © 2014 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 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.
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 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 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®branded products are not sold in Canada by JPW Industries, Inc.
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.

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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 drill 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 drill, 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, Jet 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 drill. (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 drill. 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
contains 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 drill, 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 drill 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 drill 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.
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 drill.

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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 drill clean and oiled for best and safest performance.
Specifications
Stock Number........................................................................................................................ JNS-4031KL
Drilling Cap (in.)....................................................................................................................................3/8
Free Speed (no load)(RPM)...............................................................................................................1800
Required Air Pressure (PSI)...................................................................................................................90
Average Air Consumption (CFM).............................................................................................................6
Air Inlet Diameter (in.)................................................................................................................... 1/4 NPT
Air Hose Inside Diameter (in.)...............................................................................................................3/8
Vibration Value (m/s2).................................................................. (according to EN12096) x:10,y:0.5,z:0.7
Overall Length (in.)............................................................................................................................. 8.07
Net Weight (lbs.)................................................................................................................................. 2.76
The above specifications were current at the time this manual was published, 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.
Record your purchase information here for quick reference:
Stock No.: Serial No.:
Purchased From: Date Purchased:

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Unpacking
Any missing parts or damage should be reported
immediately to your JET®distributor. Read this
instruction manual thoroughly for operation,
maintenance and safety instructions.
Operation
1. The drill must be properly lubricated before
operating. See “Maintenance” section for
lubricating instructions.
2. Install a bit (not provided) into the chuck,
and rotate the chuck by hand until firmly
tight. Make sure the bit is centered in the
chuck.
3. 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 Air Drill 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.
Maintenance
The drill 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 drill.
2. Place 4 or 5 drops of air tool oil* into the air
inlet (Figure 1).
[*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 oil.]
3. Re-connect the air. Run the drill without load
for a few seconds to distribute the oil
throughout the tool.
Figure 1
4. When you are finished operating the air drill,
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 drill 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 drill.
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”.

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Troubleshooting
Trouble Probable Cause Remedy
Drill does not operate
at normal speed.
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.
To order parts or reach our service department, call 1-800-274-6848 Monday through Friday (see our
website for business hours, www.jettools.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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427 New Sanford Road
LaVergne, Tennessee 37086
Phone: [phone]
www.jettools.com