Operating and Maintenance Instructions
5” (or 4-1/2”) Angle Grinder
Model JNS-185
WALTER M EIE R (Manufactur ing) Inc .
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-JNS185
Ph.: 800-274-6848 Revision C1 06/2012
www.walterm eier .com Copyright © Walter M eier (Manuf ac turing) Inc.
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, SPECI AL, 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 produc ts are not sold in Canada by Walter Meier.
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Warning
1. Read and understand thi s entire manual before attempting assembly or operation.
2. Read and understand t he warnings posted on t he tool and in t his manual. Failur e to comply with all of
these warnings may c ause serious i njury.
3. Replace warning labels if they become obscured or remov ed.
4. This angle grinder is designed and intended f or use by properly trained and experi enced personnel
only. If you are not fami liar with the proper and safe operati on of an angle grinder, do not use until
proper training and k nowl edge have been obtained.
5. Do not use this tool for other than its intended use. If used for other purposes, Walter Meier
(Manufactur ing) Inc., di sclaims any real or implied warranty and hol ds itself harmless from any injur y
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; t hey ar e not sa fety glasses.)
7. Wear ear protector s (plugs or muffs) if the noise exceeds norm al levels.
8. Gloves are recommended when operati ng the angle grinder. Keep hands and body a way from t he
wheel area of the tool.
9. Some dust created by power sanding, sawing, grinding, drilling and other construction activities
contain chemi cals known to cause cancer , birt h defects or other repr oductiv e harm. Some examples
of these chemic als are:
• Lead from lead based paint.
• Crystalline 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 whil e tired or under the influence of drugs, al c ohol or any medication.
11. Maint ain proper balanc e and keep your footi ng at all tim es. Non-slip f ootwear or anti -skid fl oor strips
are recommended.
12. S ec ur e the work with clamps or a vise so that both hands are free to operate the angle grinder .
13. Bef ore operating this angle gri nder, remove tie, rings, watches and other jewelry , and roll sleeves up
past the elbows. Remove all loose clothing and confi ne long hair .
14. M ak e sure t he angle grinder is in OFF positi on before connecting the air hose.
15. Excessiv e air pressure will decrease the life of the tool and may cause a hazardous situation.
16. Check ai r hoses for wear, and keep them away from heat and sharp edge s. Do not carry the angle
grinder by the air hose.
17. Do not use this air tool near flammable objects or potentially ex plosive environments.
18. Do not leave a c onnec ted 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 maki ng adjustm ents or changing accessories.
20. K eep work area c lean and free of clutt er . Pr ov ide for adequate space surrounding work area and nonglare, overhead lighting.
21. K eep v isitors a safe distance from the work area. Keep children away.
22. Giv e 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 f orce a tool or attachment to do a j ob for which i t was not designed. T he right tool will do t he
job better and safer .
24. Use recom mended acces sories; im proper acces sories m ay be hazardou s. Use onl y grindi ng wheels
that have an RPM rating equal to or greater than your angle grinder .
25. M aintain tools with care. Keep the angle grinder clean and oiled for best and safest performance.
Familiarize you rself with the following safety notices used in this manual:
This means that if precautions are not heeded, it may result i n mi nor i njur y and/or
possible tool dam age.
This means that if precautions are not heeded, it may result i n 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
Overall Lengt h (i n.) .................................................................................................................................. 9
Net Weigh t (lb s.) ................................................................................................................................. 3.87
Shipping Weigh t (lbs.)......................................................................................................... .................. 4.5
The above specifications were current at the tim e this manual was publi shed, but because of our policy of
continuous improvement, W alter Meier (Manufactur ing) Inc., reserves the right t o c hange specificati ons at
any time and without pri or notice, without incurring obligations.
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) ...................................................................................... (according to EN12096) 3.4
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Operation
The box should include 1 Angle Grinder, 1
Handle and 2 Wrenches. Any missing parts
should be reported t o your J ET distr ibut or. Read
this instructi on manual thoroughly for operation,
maintenance and safety instructions.
1. Lubricate t he angle grinder bef or e oper ating.
See “Maintenance” section for oiling
instructions.
2. Assemble the handle to the threaded hol e of
the angle grinder.
3. The disc guard can be rotated left or right.
Remove the socket head cap screws (F igure
1) with a 4mm hex wrench, and re-positi on
the guard. All four of the socket head cap
screws must be installed and tightened
before operati ng the grinder.
Maintenance
The angle grinder shoul d be lubricated daily (or
before each use) with air tool oil. During
continual operation, it should be oil ed every 1 t o
2 hours. This m ay be done using an i n-l i ne oiler ,
or manually. If done manually, proceed as
follows:
1. Disconnect gri nder from air supply.
2. Place a f ew drops of air tool oil* into the ai r
inlet (Figur e 2).
(*Not included. A ir tool oil may be pur c hased
from your JET dealer, or is available at
major tool and hardware stores. SAE #10weight oil m ay be used as a substitute. Do
not use detergent oil.)
Figure 1
4. Remove the fl ange 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 spindl e as shown.
Only use grinding wheels
that have an RPM rating equal to or greater
than the angle grinder itself.
5. Remove the cap fr om the grinder ’s air inl et
(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 gri nder 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 line.
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 t he gr inder,
before stori ng it disconnect t he air hose and
place 4 or 5 drops of air tool oil into t he air
inlet, then re-connect and run the tool to
distribut e the oil. This will prolong t he 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.
6. Push forward the throttle lever lock and
press up on the throttle lever (Figure 2).
How far the throttle lever is pressed
determines rot ati on speed.
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Air Connection
1. Make sure that the air compressor supplies
the correct CFM for the gri nder .
2. Set air pressure to 90 psi. Higher pressure
and/or unclean ai r may create a hazardous
situation, and will shorten the tool’s lif e.
3. Drain water from the air compressor tank
daily, as well as any condensati on in the air
lines. W ater in the ai r line can ent er the tool
and cause damage.
4. Clean the air inlet filt er c ar tridge weekly.
5. Line pressure should be increased
accordingl y to compensate f or ext ra long ai r
hoses (usually over 25 f eet). Inside diameter
of air hoses should be a minim um of 3/8”.
Troubleshooting
Trouble Probable Cause Remedy
Air pressure is too low. Adjust air pressure to 90p si .
Grinder does not
operate at normal
speed; or speed
remains constant
when pressing the
throttle lever.
Stops operating.
Reduced torque. Air leakage.
Starts immediately as
soon as air is
connected, even
though throttl e is at
OFF position
Abnormal vibration
and/or excessive
heat develops in t he
tool.
Air lines are twisted, or there is a
blockage in them .
Air compressor is malfunctioning, or is
not sufficient capac ity for the tool.
Throttle is malfunctioning.
No air pressure.
Throttle is malfunctioning.
Throttle is malfunctioning.
Improper l ubri c ati on.
Untwist or clean out ai r li nes.
Replace air compr essor.
Have grinder inspected and repaired
by an authorized serv ic e c ent er.
Check air compressor and hoses.
Make sure compressor is set at 90psi ,
and air lines are not twisted.
Have grinder inspected and repaired
by an authorized serv ic e c ent er.
Check air connections. Make
adjustment s/r epairs as needed.
Have grinder inspected and repaired
by an authorized serv ic e c ent er.
Follow proper lubr ication 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 ac c ur ately.
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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 B eari ng ..........................................................6202Z ........................1
9......... .. ....JNS185-9.... .. .......... Spindle Collar ........................................................................................1
10.............JNS185-10.............. Bevel Gear ............................................................................................1
11.............JNS185-11.............. B all B eari ng .......................................................... 626Z .........................1
12.............JNS185-12.............. S pac er ...................................................................................................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.............. Housi ng .................................................................................................1
17.............JNS185-17.............. Pi nion ....................................................................................................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.............. V ane ......................................................................................................4
22.............JNS185-22.............. Rotor .....................................................................................................1
23.............JNS185-23.............. Cyli nder .................................................................................................1
24.............JNS185-24.............. Roll Pi n ..................................................................................................1
25.............JNS185-25.............. B eari ng Pl ate .........................................................................................1
26.............JNS185-26.............. B all B eari ng .......................................................... 608Z .........................2
27.............JNS185-27.............. Handle ...................................................................................................1
28.............JNS185-28.............. Screw .....................................................................................................1
29.............JNS185-29.............. S pri ng ....................................................................................................1
30.............JNS185-30.............. V alv e Stem Bushing ...............................................................................1
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Index No Part No Description Size Qty
31.............JNS185-31.............. V alv e Stem.............................................................................................1
32.............JNS185-32.............. O-Ring .................................................................Ø5x2.4mm.................1
33.............JNS185-33.............. O-Ring .................................................................Ø 9x2mm ..................1
34.............JNS185-34.............. Roll Pi n ..................................................................................................2
35.............JNS185-35.............. P endulum ...............................................................................................8
36.............JNS185-36.............. Loc ki ng Nut ...........................................................................................1
37.............JNS185-37.............. Coupling Nut ..........................................................................................2
38.............JNS185-38.............. Throttle Valve Housing ...........................................................................1
39.............JNS185-39.............. Nut ........................................................................................................1
40.............JNS185-40.............. S pri ng ....................................................................................................1
.................JNS185-100............ Throttle Valve Assembly (contains index# 41 and 42) .............................1
41 ............. .............................. Thrott le Valve Body ...............................................................................1
42 ............. .............................. Thrott le Valve .........................................................................................3
43.............JNS185-43.............. Ai r Inlet ..................................................................................................1
44.............JNS185-44.............. Roll Pi n ..................................................................................................1
.................JNS185-200............ Throttle Lever Assembly (contains index# 45 thru 48) .............................1
45 ............. .............................. Thrott le Lever Lock ................................................................................1
46 ............. .............................. Tors ion Spring .......................................................................................1
47 ............. .............................. Roll Pin ..................................................................................................1
48 ............. .............................. Thrott le Lever ........................................................................................1
49.............JNS285-49 .............. Wrench ..................................................................................................1
50.............JNS285-50.............. Pi n Wrenc h ............................................................................................1
51.............JNS185-51.............. Flange ...................................................................................................1
52.............JNS185-52.............. B ushi ng .................................................................................................1
53.............JNS185-WL ............ Warning Label (not shown) ....................................................................1
54.............JNS185-54.............. B eari ng ..................................................................................................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 Ki t (inc ludes index # 21,32,33,40)
NOTE: Grinding wheels are not pr ov ided; see your dealer to order.
WALTER M EIE R (Manufactur ing) Inc .
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.waltermeier.com
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