Operating and Maintenance Instructions
1/2-inch Reversible Air Drill
Model JNS-4041KL
JET
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-JNS4041KL
Ph.: 800-274-6848 Revision A1 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 provi d e pr o of
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 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 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 WARRANTI ES 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 drill is designed and i ntended for use by properl y trai ned and ex peri enced per sonnel onl y. If you
are not fami liar with the proper and saf e operation of an air operat ed drill, 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 approv ed safety glasses/f ace shields while using this drill. (Ever yday eyeglasses only
have impact resistant lenses; they are not safety glasses. )
7. Wear ear protector s (plugs or muffs) if the noise exc eeds normal levels.
8. Use gloves if needed when op erating t he drill . Keep hands and b ody away f rom 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. B efore operati ng this drill, remove tie, rings, watches and other jewelry, and roll sl eeves 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 ai r hoses for wear, and kee p them away from heat and shar p edges. Do not car ry the dri ll by
the air 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 drill from air supply befor e making adjustments 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 motions and/or exposure to constant vi bration can be harmf ul to hands and arms. Take
breaks and relax your hands occasionally during ex tended operation of the air drill.
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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 tools wit h c ar e. Keep the drill clean and oiled for best and safest performance.
Specifications
Stock Number........................................................................................................................ JNS-4041KL
Chuck (in.) ............................................................................................................................................ 1/2
Free Speed (no load)(RP M ) ................................................................................................................. 400
Required Air Pr essure (PSI)................................................................................................................... 90
Average Air Consumption (CFM) ............................................................................................................. 8
Air Inlet Diameter (in.) ................................................................................................................... 1/4 NPT
Air Hose Inside Diameter (in.) ............................................................................................................... 3/8
Vibration V alue (m/ s
Overall Lengt h (in.) ............................................................................................................................. 8.86
Net Weigh t (lb s.) ................................................................................................................................. 3.86
The above specifications were current at the time this m anual was published, but because of our policy of
continuous impr ovement, JET reserves the ri ght to change specifications at any tim e and without prior
notice, without incurring obligations.
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) ................................................................ (according to EN12096) x:0.7,y:0.7,z:0.5
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 include an air drill, a handle,
and a handle mounting collar. Any damaged
or missing parts should be repor ted im mediately
to your JET
manual thoroughly for operation, maintenance
and safety instruc tions.
® distributor. Read this instruction
Operation
1. The drill must be properl y lubricated before
operating. See “Maintenance” section for
lubricating instructions.
2. Slide the mounting collar onto the barrel of
the drill. If it will not slide over the chuck,
wedge a flat blade screwdriver into the slit of
the mounting collar and slightly pry it open
until it will cl ear the chuc k .
3. Screw the handle onto the threads of the
mounting coll ar unt il it i s ti ght. The m ounti ng
collar and handle can be rotated to any
convenient posit ion on the barrel of t he drill
and re-tightened in place.
4. 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.
5. Remove the protectiv e c ap from t he air inlet,
and connect your 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 coupli ngs
farther down the li ne.
Maintenance
The drill should be lubricated daily (or before
each use) with air tool oil through the air inlet.
During conti nual operation, it shoul d be re-oiled
every 1 to 2 hours. T his can be done eit her with
an in-line oiler, or manually. If done manually,
proceed as follows:
1. Disconnect the air hose fr om the drill.
2. Place four or five drops of air tool oil* into
the air inlet (Fi gur e 1) .
[*NOTE: Air tool oil not provided. It may be
purchased fr om your JET deal er, or is av ailable
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.]
Figure 1
3. Re-connect the air. Run the drill without load
for a few seconds to distribute the oil
throughout the tool.
4. When you are finished operating the drill,
before stori ng it disconnect t he air hose and
place 4 or 5 drops of air tool oil i nto the air
inlet; r e- c onnec t the air and run the tool f or a
few seconds to distri bute the oil.
5. Avoid storing the drill in v er y humi d locations
which promotes rusting of internal
mechanisms, and always oil it before
storage.
Air Connection
1. Make sure t hat the air com pressor 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 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”.
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Troubleshooting
Trouble Probable Cause Remedy
Air pressure is too low. Adjust air pressure to 90p si .
Air lines are twisted, or there is a
blockage in them .
Drill does not operate
at normal speed.
Stops operating.
Torque is dimi nished. Air leak age.
Starts immediately as
soon as air is
connected without
trigger being pr essed.
Abnormal vibration
and/or excessive
heat develops in the
tool.
Air compressor is malfunctioning, or is
not suffici ent capac ity for the tool.
Air regulat or i s malf unc tioning.
No air pressure.
Trigger or thr ottl e v alv e is
malfunctioning.
Throttle v alv e or tri gger ar e
malfunctioning.
Improper l ubri c ation.
Untwist or clean out air lines.
Replace air compr essor.
Have regulator repaired or replaced at
an authorized service center.
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.
Check connections at the air inlet, orings, etc. Mak e adjustm ents/repairs
as needed.
Inspect and repair throttle valve
and/or trigger.
Lubricate pr oper ly ac c or ding to
instructions in this manual.
To order parts or reach our service department, call 1-800-274-6848 Mon day through Friday (see our
website for business hours, www.jett ools.com). Havi ng the Model Number and S er ial Num ber of your tool
available when you call wi ll allow us to serve you quickly and accurately.
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7
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.jettools.com
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