Jet JNS-185 Manual

Operating and Maintenance Instructions
5” (or 4-1/2”) Angle Grinder
Model JNS-185
WALTER MEIER (Manufacturing) Inc.
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-JNS185
Ph.: 800-274-6848 Revision C1 06/2012
www.waltermeier.com Copyright © 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 Walter Meier distributor, or visit waltermeier.com.
WARRANTY
JET products carry a limited warranty which varies in duration based upon the product (MW = Metalworking, WW =
Woodworking).
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?
Five Year Warranties do not cover woodworking (WW) products used for commercial, industrial or educational
purposes. Woodworking products with Five Year Warranties that are used for commercial, industrial or education
purposes revert to a One Year Warranty. 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 (MANUFACTURING) INC., 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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Warning
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 warning labels if they become obscured or removed.
4. This angle 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 angle 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 angle 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. Gloves are recommended when operating the angle grinder. Keep hands and body away from the
wheel 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. Secure the work with clamps or a vise so that both hands are free to operate the angle grinder.
13. Before operating this angle grinder, remove tie, rings, watches and other jewelry, and roll sleeves up
past the elbows. Remove all loose clothing and confine long hair.
14. Make sure the angle grinder is in OFF position before connecting the air hose.
15. Excessive air pressure will decrease the life of the tool and may cause a hazardous situation.
16. Check air hoses for wear, and keep them away from heat and sharp edges. Do not carry the angle
grinder by the air hose.
17. Do not use this air tool near flammable objects or potentially explosive environments.
18. Do not leave a connected tool unattended. When not in use, turn off the angle grinder and disconnect
it from the air source.
19. Disconnect angle grinder from air supply before making adjustments or changing accessories.
20. Keep work area clean and free of clutter. Provide for adequate space surrounding work area and non-
glare, overhead lighting.
21. Keep visitors a safe distance from the work area. Keep children away.
22. Give your work undivided attention. Looking around, carrying on a conversation and “horse-play” are
careless acts that can result in serious injury.

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23. 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.
24. Use recommended accessories; improper accessories may be hazardous. Use only grinding wheels
that have an RPM rating equal to or greater than your angle grinder.
25. Maintain tools with care. Keep the angle grinder clean and oiled for best and safest performance.
Familiarize yourself with the following safety notices used in this manual:
This means that if precautions are not heeded, it may result in minor injury and/or
possible tool damage.
This means that if precautions are not heeded, it may result in serious injury or possibly
even death.
- - SAVE THESE INSTRUCTIONS - -
Specifications
Stock Number...............................................................................................................................JNS-185
Wheel Size (in.).................................................................................... Ø 4-1/2 x 7/8 Bore, Ø 5 x 7/8 Bore
Spindle Thread (in./TPI)................................................................................................................... 5/8-11
Free Speed [No Load] (RPM) ......................................................................................................... 11,000
Required Air Pressure (PSI)...................................................................................................................90
Average Air Consumption (CFM).............................................................................................................6
Air Inlet (in.).................................................................................................................................. 1/4 NPT
Air Hose Inside Diameter (in.)...............................................................................................................3/8
Vibration Value (m/s
2
)......................................................................................(according to EN12096) 3.4
Overall Length (in.)..................................................................................................................................9
Net Weight (lbs.)................................................................................................................................. 3.87
Shipping Weight (lbs.)...........................................................................................................................4.5
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.

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Operation
The box should include 1 Angle Grinder, 1
Handle and 2 Wrenches. Any missing parts
should be reported to your JET distributor. Read
this instruction manual thoroughly for operation,
maintenance and safety instructions.
1. Lubricate the angle grinder before operating.
See “Maintenance” section for oiling
instructions.
2. Assemble the handle to the threaded hole of
the angle grinder.
3. The disc guard can be rotated left or right.
Remove the socket head cap screws (Figure
1) with a 4mm hex wrench, and re-position
the guard. All four of the socket head cap
screws must be installed and tightened
before operating the grinder.
Figure 1
4. Remove the flange nut (Figure 1) and mount
a 4-1/2” or 5” diameter grinder wheel (not
provided) on the spindle. Re-install and
securely tighten the flange nut against the
grinding wheel, using the provided pin
wrench while holding the other wrench on
the flats of the spindle as shown.
Only use grinding wheels
that have an RPM rating equal to or greater
than the angle grinder itself.
5. Remove the cap from the grinder’s air inlet
(Figure 2) and connect the air supply hose
to the grinder. Set the air pressure to 90 psi.
IMPORTANT: Connecting a quick-change
coupling directly to the angle 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.
6. Push forward the throttle lever lock and
press up on the throttle lever (Figure 2).
How far the throttle lever is pressed
determines rotation speed.
Maintenance
The angle grinder should be lubricated daily (or
before each use) with air tool oil. During
continual operation, it should be oiled every 1 to
2 hours. This may be done using an in-line oiler,
or manually. If done manually, proceed as
follows:
1. Disconnect grinder from air supply.
2. Place a few drops of air tool oil* into the air
inlet (Figure 2).
(*Not included. Air tool oil may be purchased
from your JET dealer, or is available at
major tool and hardware stores. SAE #10-
weight oil may be used as a substitute. Do
not use detergent oil.)
Figure 2
3. Connect the grinder to the air supply. Run
the tool without load for a few seconds to
distribute the oil through the tool. NOTE:
Any excess oil may be propelled from the
spindle area – keep it pointed in a safe
direction.
4. When you are finished operating the grinder,
before storing it disconnect the air hose and
place 4 or 5 drops of air tool oil into the air
inlet, then re-connect and run the tool to
distribute the oil. This will prolong the life of
your grinder.
5. Avoid storing the grinder in a humid
environment which promotes rusting of
internal mechanisms; and always oil it
before storage.

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Air Connection
1. Make sure that the air compressor supplies
the correct CFM for the grinder.
2. Set air pressure to 90 psi. Higher pressure
and/or unclean air may create a hazardous
situation, and will shorten the tool’s life.
3. Drain water from the air compressor tank
daily, as well as any condensation in the air
lines. Water in the air line can enter the tool
and cause damage.
4. Clean the air inlet filter cartridge weekly.
5. Line pressure should be increased
accordingly to compensate for extra long air
hoses (usually over 25 feet). Inside diameter
of air hoses should be a minimum of 3/8”.
Troubleshooting
Trouble Probable Cause Remedy
Grinder does not
operate at normal
speed; or speed
remains constant
when pressing the
throttle lever.
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.
Throttle is malfunctioning. Have grinder inspected and repaired
by 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.
Throttle is malfunctioning. Have grinder inspected and repaired
by an authorized service center.
Reduced torque. Air leakage. Check air connections. Make
adjustments/repairs as needed.
Starts immediately as
soon as air is
connected, even
though throttle is at
OFF position
Throttle is malfunctioning. Have grinder inspected and repaired
by an authorized service center.
Abnormal vibration
and/or excessive
heat develops in the
tool. Improper lubrication. Follow proper lubrication procedures
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, 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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Parts List for JNS-185 Angle Grinder
Index No Part No Description Size Qty
1...............JNS185-1................ Flange Nut .............................................................................................1
3...............JNS185-3................ Screw.....................................................................................................4
4...............JNS185-4................ Lock Washer..........................................................................................4
5...............JNS185-5................ Disc Cover.............................................................................................1
6...............JNS185-6................ Spindle ..................................................................................................1
7...............JNS185-7................ Flat Key..................................................................................................1
8...............JNS185-8................ Ball Bearing..........................................................6202Z........................1
9...............JNS185-9................ Spindle Collar ........................................................................................1
10.............JNS185-10.............. Bevel Gear ............................................................................................1
11.............JNS185-11.............. Ball Bearing.......................................................... 626Z.........................1
12.............JNS185-12.............. Spacer ...................................................................................................1
13.............JNS185-13.............. Screw.....................................................................................................1
14.............JNS185-14.............. Exhaust Screen .....................................................................................1
15.............TS-1531012...........Phillips Pan Head Machine Screw........................M3x6.........................2
16.............JNS185-16.............. Housing .................................................................................................1
17.............JNS185-17.............. Pinion ....................................................................................................1
18.............JNS185-18.............. Rotor Collar ...........................................................................................1
19.............JNS185-19.............. Front Plate.............................................................................................1
20.............JNS185-20..............Woodruff Key....................................................... 3x3.5mm, R6.5.........1
21.............JNS185-21.............. Vane......................................................................................................4
22.............JNS185-22.............. Rotor .....................................................................................................1
23.............JNS185-23.............. Cylinder .................................................................................................1
24.............JNS185-24.............. Roll Pin ..................................................................................................1
25.............JNS185-25.............. Bearing Plate .........................................................................................1
26.............JNS185-26.............. Ball Bearing.......................................................... 608Z.........................2
27.............JNS185-27.............. Handle...................................................................................................1
28.............JNS185-28.............. Screw.....................................................................................................1
29.............JNS185-29.............. Spring....................................................................................................1
30.............JNS185-30.............. Valve Stem Bushing...............................................................................1

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Index No Part No Description Size Qty
31.............JNS185-31.............. Valve Stem.............................................................................................1
32.............JNS185-32.............. O-Ring .................................................................Ø5x2.4mm.................1
33.............JNS185-33.............. O-Ring .................................................................Ø 9x2mm ..................1
34.............JNS185-34.............. Roll Pin ..................................................................................................2
35.............JNS185-35.............. Pendulum...............................................................................................8
36.............JNS185-36.............. Locking Nut ...........................................................................................1
37.............JNS185-37.............. Coupling Nut..........................................................................................2
38.............JNS185-38.............. Throttle Valve Housing...........................................................................1
39.............JNS185-39.............. Nut ........................................................................................................1
40.............JNS185-40.............. Spring....................................................................................................1
.................JNS185-100............ Throttle Valve Assembly (contains index# 41 and 42).............................1
41............. ..............................Throttle Valve Body ...............................................................................1
42............. ..............................Throttle Valve.........................................................................................3
43.............JNS185-43.............. Air Inlet ..................................................................................................1
44.............JNS185-44.............. Roll Pin ..................................................................................................1
.................JNS185-200............ Throttle Lever Assembly (contains index# 45 thru 48).............................1
45............. ..............................Throttle Lever Lock................................................................................1
46............. ..............................Torsion Spring .......................................................................................1
47............. ..............................Roll Pin..................................................................................................1
48............. ..............................Throttle Lever ........................................................................................1
49.............JNS285-49..............Wrench..................................................................................................1
50.............JNS285-50.............. Pin Wrench ............................................................................................1
51.............JNS185-51.............. Flange ...................................................................................................1
52.............JNS185-52.............. Bushing .................................................................................................1
53.............JNS185-WL ............Warning Label (not shown) ....................................................................1
54.............JNS185-54.............. Bearing ..................................................................................................1
55.............JNS185-55.............. Retainer.................................................................................................1
56.............JNS185-56.............. Retaining Ring........................................................................................1
.................JNS185-RB............. Rebuild Kit (includes index # 6,8,10,17,26)
.................JNS185-RP............. Repair Kit (includes index # 21,32,33,40)
NOTE: Grinding wheels are not provided; see your dealer to order.
WALTER MEIER (Manufacturing) Inc.
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: [phone]
www.waltermeier.com