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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, WMH Tool Group 

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.

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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. 

Summary of Contents for JNS-4031

Page 1: ...d Parts Manual 3 8 inch Reversible Air Drill Models JNS 4031 and JNS 4031KL WMH TOOL GROUP 2420 Vantage Drive Elgin Illinois 60123 Part No M JNS4031 Ph 800 274 6848 Revision A 6 06 www wmhtoolgroup com Copyright WMH Tool Group ...

Page 2: ...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 a...

Page 3: ...mium 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...

Page 4: ...cations Stock Number JNS 4031 JNS 4031KL Drilling Cap in 3 8 3 8 Free Speed no load RPM 1800 1800 Required Air Pressure PSI 90 90 Average Air Consumption CFM 6 6 Air Inlet Diameter in 1 4 NPT 1 4 NPT Air Hose Inside Diameter in 3 8 3 8 Vibration Value m s 2 according to EN12096 x 10 y 0 5 z 0 7 Overall Length in 8 07 8 07 Net Weight lbs 2 76 2 76 The above specifications were current at the time t...

Page 5: ...nually 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 Figure 1 3 Re connect the air Run the drill with...

Page 6: ...ressor and hoses Make sure compressor is set at 90psi and air lines are not twisted Stops operating 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 tri...

Page 7: ...y 1 02KL JNS4031KL 02 Keyless Chuck for Model JNS 4031KL only 1 03 JNS4031 03 Housing Sleeve 1 04 JNS4031 04 Bearing 6201 2 05 JNS4031 05 Gear Frame 1 06 JNS4031 06 Roll Pin Ø4x14 mm 3 07 JNS4031 07 Assembly Gear 3 08 JNS4031 08 Inner Gear 1 09 JNS4031 09 Washer 1 10 JNS4031 10 Front Plate 1 11 JNS4031 11 Bearing 626ZZ 1 12 JNS4031 12 Fixing Pin 1 13 JNS4031 13 Rotor 1 14 JNS4031 14 Rotor Blade 5 ...

Page 8: ...S4031 29 Trigger Base 1 30 JNS4031 30 Pin Ø2 5x24 mm 1 31 JNS4031 31 Main Housing 1 32 JNS4031 32 Exhaust Deflector 1 33 JNS4031 33 Screw M3x6 2 34 JNS4031 34 Air Inlet 1 35 JNS4031 35 Inlet Cover 1 36 JNS4031 36 Chuck Key for model JNS 4031 only not shown 1 37 JNS4031 WL Warning Label not shown 1 WMH Tool Group 2420 Vantage Drive Elgin Illinois 60123 Phone 800 274 6848 www wmhtoolgroup com ...

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