Benchmark 1282-943 User manual

5YearLimitedWarranty
WEAR CSA
APPROVED EYE
PROTECTION
WEAR A
FACE MASK
WEAR EAR
PROTECTION

1
PRODUCTSPECIFICATIONS
PNEUMATIC1/4”DIEGRINDER
Maxspeed
20,000RPM
MaxPSI
90PSI
AverageAirConsumption
4CFM@90PSI
Workingpressure
90PSI
Airinlet
1/4”NPT
Collets
1/4"(installedintool)and1/8"
RecommendedHose
3/8"(9.5mm)
Weight
1.3lbs.(0.6kg)
•Please note (where the ¼” NPT connecter is not already installed on the tool) your tool
may be shipped with a black plastic cap installed in the air inlet.
Pry the cap out prior to installing the ¼” NPT connector.
NEED ASSISTANCE?
Call us on our toll-free customer support line:
1-866-349-8665 (Monday through Friday 9am – 5pm Eastern Standard Time)
•Technical questions
•Replacement parts
•Parts missing from package
NOTE these instructions pertain to the tool only. Please refer
to your compressors operator’s manual and follow the
manufactures instructions.

1282-943
PNEUMATIC1/4"DIEGRINDER
2
`TABLEOFCONTENTSProductSpecifications.............................................................................................. 1TableofContents....................................................................................................... 2SafetyGudelines.....................................................................................................3-6Symbols...................................................................................................................... 7ToolSpecificWarnings.............................................................................................. 7KnowyourPneumatic1/4”DieGrinder...................................................................8AssemblyandOperating..................................................................................... 9-12Maintenance...................................................................................................... 13-15ExplodedView.......................................................................................................... 16PartsList................................................................................................................... 17Warranty................................................................................................................... 18

3
SAFETYGUIDELINESWARNING:This manual contains information that relates to PROTECTING PERSONAL SAFETY
and PREVENTING EQUIPMENT PROBLEMS. It is very important to read this manual
carefully and understand it thoroughly before using the product. The symbols listed
below are used to indicate this information.
DANGER!Potential hazard that will result in serious injury or loss of life.
WARNING!Potentialhazardthatcouldresultinseriousinjuryorlossoflife.CAUTION!Potentialhazardthatmayresultinmoderateinjuryordamagetoequipment.NOTE:-Theword"Note"isusedtoinformthereaderofsomethinghe/sheneedstoknowaboutthetool.PERSONAL SAFETY
These precautions are intended for the personal safety of the user and others
working with the user. Please take time to read and understand them.

1282-943
PNEUMATIC1/4"DIEGRINDER
4
`
Donotuseoxygenoranyothercombustibleorbottledgastopowerair-poweredtools.Failuretoobservethiswarningcancauseexplosionandseriouspersonalinjuryordeath.Useonlythecompressedairtopowertheair-poweredtools.Useaminimumof25’(7.6m)ofhosetoconnectthetooltothecompressor.Failuretocomplywillresultinseriousinjuryorlossoflife.
Riskofelectricshock:Donotexposeacompressortorain.Storeitindoors.Disconnectthecompressorfrompowersourcebeforeservicing.Compressormustbegrounded.Donotusegroundingadaptors.
Riskofpersonalinjury:Donotdirectcompressedairfromtheairhosetowardstheuserorotherpersonnel.
Riskforinhalation:Neverdirectlyinhaletheairproducedbythecompressor.
Riskofbursting:Donotadjustthepressureswitchorsafetyvalveforanyreason.Theyhavebeenpresetatthefactoryforthiscompressor’smaximumpressureTamperingwiththepressureswitchorthesafetyvalvemaycausepersonalinjuryorpropertydamage.
Riskofburns.Thepumpandthemanifoldgeneratehightemperatures.Inordertoavoidburnsorotherinjuries,donottouchthepump,themanifold,orthetransfertubewhilethecompressorisrunning.Allowthepartstocooldownbeforehandlingorservicing.Keepchildrenawayfromthecompressoratalltimes.
Riskofbursting:Makesuretheregulatorisadjustedsothatthecompressoroutletpressureissetlowerthanthemaximumoperatingpressureofthetool.Beforestartingthecompressor,pulltheringonthesafetyvalvetomakesurethevalvemovesfreely.Drainwaterfromtankaftereachuse.Donotweldorrepairtank.Relieveallpressureinthehosebeforeremovingorattachingaccessories.
Oxygen
nydrogen
Combustible
explosive
SYMBOL MEANING

5
DANGER!
Keep children away from the work area. Do not allow children to handle power
tools.
Do not use this tool in the presence of flammable liquids or gases.
Sparks that are created during use may ignite gases.
Keep air hose away from heat, oil, and sharp edges. Check air hose for wear
before each use and ensure that all connections are proper.
Always ensure that the workpiece is firmly secured leaving both hands free to
control the tool.
Always ensure that the tool has stopped before putting it down after use,
for safety purposes and to prevent possible damage to the tool/user.
Keep proper footing at all times in order to ensure correct balance.
WARNING!
Do not allow unskilled or untrained individuals to operate the tool.
Do not use the tool for any task other than that it is
designed to perform.
Locate the compressor in a well-ventilated area for cooling, and a minimum
of 12” (31 cm) away from the nearest wall.
Protect the air hose and the power cord from damage and puncture. Inspect
them for weak or worn spots every week and replace them if necessary.
Always wear hearing protection when using the air compressor. Failure to
do so may result in hearing loss.
Do not carry the compressor while it is running.
Do not operate the compressor if it is not in a stable position.
Do not operate the compressor on a rooftop or an elevated position that
could allow the unit to fall or be tipped over.
Do not connect the tool to a compressed air source with a pressure output
that is higher than 90 PSI.
Always replace a damaged gauge before operating the unit again.
CAUTION!
Always ensure that the tool has stopped before connecting to the air supply.
Do not wear watches, rings, bracelets, or loose clothing when using any
air- powered tool.
Do not overload the tool. Allow the tool to operate at its optimum
speed for maximum efficiency.
Do not use a tool that is leaking air, that has missing or damaged parts, or
that requires repairs. Verify that all screws are securely tightened.
For optimal safety and tool performance, inspect the tool daily in order to ensure
free movement of the trigger, safety mechanisms, and springs.
Always keep your air tool clean and lubricated. Daily lubrication is essential to
avoid internal corrosion and possible failures.
Ensure the floor is not slippery and wear non-slip shoes. Floors should be kept
clean and clear.
Always follow all workshop safety rules, regulations, and conditions when
using the tool.
Carry the tool by the handle only, keeping fingers away from the trigger. Do not
carry the tool by the hose, magazine, or any other parts.
Do not use the tool near or below freezing point, as doing so may cause tool
failure. Do not store the tool in a freezing environment to prevent ice formation
on the tools operating valves, as doing so may cause tool failure.
Handling and storage of oil: Use with adequate ventilation. Avoid contact of oil
with eyes, skin, and clothing. Avoid breathing spray or mist. Store in a tightly
closed container in a cool, dry, well-ventilated area free from Incompatible
substances.
Tripping hazard：The air hose may become a tripping hazard when it is
place in the work area. Use care when walking in the work area.

1282-943
PNEUMATIC1/4"DIEGRINDER
6
`
Risk to hearing Always wear ear protection when using
this tool ,failure to do so may result in hearing loss.
CAUTION!
Disconnect tool from the air supply and turn off the
compressor before performing any maintenance or
changing accessories, when clearing a jammed fastener,
when the tool is not in use, when it is being handed to
another person, and when it is left unattended. Failure to
comply may result in moderate injury or damage to
equipment.Use safety goggles and ear protection: Wear safety
glasses with side shields when operating the
tool/compressor and verify that others in the work area are
also wearing safety glasses. Safety glasses must conform to
American National Standards Institute (ANSI Z87. 1)
requirements and must provide protection from flying
particles from the front and the sides.
Air-powered tools are loud, and the sound can cause hearing
damage. Always wear ear protection to prevent hearing
damage and loss. Failure to comply may result in moderate
injury.
NOTE:Recycle unwanted materials rather than disposing of them as waste.
Sort the tools, hoses, and packaging in specific categories and take to the local
recycling center or dispose of in an environmentally safe way.
SYMBOLSWARNING: Some of the following symbols may appear on the tool.
Study these symbols and learn their meaning. Proper interpretation of
these symbols will allow for more efficient and safer operation of this
tool.
SYMBOLS
Read operator s manual: To reduce the risk of injury ,
user must read and understand operators manual before
using this product.
Eye protection: Always wear safety goggles, safety
glasses with side shields, or a full-face shield when
operating this product.

7
TOOLSPECIFICWARNINGS•Always ensure that the workpiece is firmly secured leaving both
hands free to control the tool.
•Always ensure that the tool has stopped before connecting it to the
air supply.
•Verify that grinding accessories that are used with this tool are rated
at or above the tool's speed rating (20,000 RPM). Failure to properly
match the accessory to the tool could result in serious personal injury.
•Always ensure that the accessories are rated/designed for use with
the tool.
•Ensure that the accessories are correctly and securely fastened
before connecting the tool to the air supply.
•Do not overload the tool. Allow the tool to operate at its optimum speed
for maximum efficiency.
Excessive overload can cause the tool casing to split and may also lead
to excessive wear on moving parts and possible failure.
DPo AtNen GtEia Rl!hazard that will result in serious injury or loss of
life.
Carefully read all instructions provided in this manual and
understand them thoroughly before using the tool. Do not
use grinding accessories other than those that are
specifically designed for use with an air powered die
grinder.
Falure to comply will result in serious injury or loss life
Hold the tool firmly with both hands. Always point abrasive
material away from you while operating the tool.
Do not apply additional or excessive force to the tool
when grinding.

8
KNOWYOURPNEUMATIC1/4”DIEGRINDER3
12
No.12
DescriptionAirinletTrigger
No.3
DescriptionGrindingcollet/Chuck

9
PNEUMATIC1/4”DIEGRINDER
1282-943
ASSEMBLYANDOPERATINGTheAir-poweredDieGrinderfeaturesadurable,lightweightcompositehousingdesignedtoreducevibration.Exhaustisdischargedthroughtherearofthegrinder.Thetoolisidealforlightweldbreaking,grinding,porting,polishingapplications,andforsmoothingsharpedges.COMPATIBLECOMPRESSORSGUIDELINESFORPROPERUSEANDOPERATIONBe sure to use a proper air compressor with air-powered tools. The compressor should
be able to supply a minimal air delivery of 4 CFM @ 90 PSI to ensure the compressor
can run continuously with the tool.
AirCompressorSizeandPower
11/2-2HP
21/2HP
3+HP
4-5Gallons
Light-dutyandIntermittentuse
Light-dutyandIntermittentuse
Light-dutyandIntermittentuse
6-11Gallons
Light-dutyandIntermittentuse
Medium-dutyandIntermittentuse
Medium-dutyandIntermittentuse
15+Gallons
Medium-dutyandIntermittentuse
Heavy-dutyandContinuoususe
Heavy-dutyandContinuoususe

10
AIR SYSTEM
Always use clean, dry, regulated, compressed air at 4 to 6.2 bar (60 to 90 PSI)
Do not exceed the maximum or minimum pressures. Operating the tool at the wrong
pressure (too low or too high) will cause excessive noise or rapid wear of tool.
No.
Description
No.
Description
1
Die Grinder
6
Regulator 0-90 PSI (0-6.2 bar)
2
Quick connector
7
Filter
3
Quick coupler
8
Cut-off valve
4
Air hose
9
Air compressor
5
Lubricator

PNEUMATIC1/4”DIEGRINDER
1282-943
11
WARNINGIt is recommended that a filter-regulator-lubricator is used and located as close to the tool as
possible.
If a filter-regulator-lubricator is not installed, place up to 6 drops of compressor oil into the
NPT inlet plug before each use.
If a filter-regulator-lubricator is installed, keep the air filter clean. A dirty filter will reduce the
air pressure to the tool, which will cause reduction in power, efficiency, and general
performance.
For optimal performance, install a quick coupler in the hose, if applicable.
Verify that all of the connections in the air supply system are sealed in order to prevent air
from leaking.
Airtools
ReadthisInstructionManualcarefullybeforeusingthetoolRead and follow all the safety instructions at the beginning of this manual. Inspect the air-
powered tool prior to each use in order to:
-Ensure that the proper power source is being used.
-Verify that the tool is in proper working order.
-Verify that the air pressure level (s) are properly set on the air compressor. Do
not use the tool if it is not in proper working order.
Do not use oxygen, CO2(carbon dioxide) or any other combustible, or bottled gas to power this
tool.
Do not use this tool in the presence of any flammable liquids or gases.
Do not point the tool towards the operator or other people.

12
Operation
•Donotallowthetooltorunfreeforanextendedperiodoftime.Doingsowillshortenthelifeofthetool.•Verifythattheairsupplyiscleanandairpressuredoesnotexceed90PSI(6.3bar)whileoperatingthetool.Iftheairpressureistoohighorunclean,itwillshortenthelifeofthetool.Failuretocomplycouldresultinseriousinjuryorlossoflife.
Ensure the tool (1) is disconnected
from the air hose (compressor)
(2) (fig. A).
Insert the desired grinding accessory into
the correct collet and then insert into the
chuck of the tool. Firmly re tighten the
chuck to lock the grinding accessory in
place using the wrenches.
NOTE all accessories must be inserted
into a collet before being inserted into
the chuck of the tool.
StorageIf it is necessary to store the tool for an extended period of time, apply a
generous amount of lubrication before storing.
This tool should be allowed to run for approximately 30 seconds after
lubricating, in order to ensure that the lubrication is uniformly distributed
throughout the tool.

PNEUMATIC1/4”DIEGRINDER
1282-943
13
Maintenance
NOTE:Donotstorethetoolanywherethetemperaturewillfallbelowfreezing.DANGER!•Disconnectthetoolfromtheaircompressorbeforemaintenance/service.adjustingandwhennotinuse.•Repairsmustbeperformedbyaqualifiedtechnicianonly.•Failuretocomplywillleadtoseriousinjuryorlossoflife.
MAINTENANCEREQUIRED
DESCRIPTION
TOOLSORMATERIALSREQUIRED
MAXIMUMSERVICEINTERVAL
Eachuseorevery2hrs.
Monthly
Asneeded
Generalinspection-freemovement
Trigger,spring,
None
X
In-depthinspection
Wornorbrokenparts
X
X
Replacewornorbrokenparts
X
Lubrication
Seebelow
Pneumatic
tooloil
X
• Lubrication: If the tool and the
compressor are not equipped with an
in-line lubrication system, place up to
6 drops of pneumatic tool oil into the
air inlet before each use or after
every 2 hours of continuous use,
depending on the characteristics of
workpiece.
•
Air-operated tools must be inspected periodically, and worn or broken parts must
be replaced in order to keep tools operating safely and efficiently.
•
Inspect and replace worn or damaged 0-rings, seals, etc. Tighten all screws and
caps frequently in order to help prevent personal injury.
Loss of power or erratic action may be due to the following
- Excessive drain in the air line.
- Moisture or restriction in the air pipe.
- Incorrect size or type of hose connector. Check the air supply and follow instructions.
- Grit or gum deposits in the Die Grinder may also reduce performance.

14
•Inspect the trigger, the spring, and the safety mechanism for free movement on a regular
basis in order to ensure that the safety system is fully functional.
•Verity that no part is loose or missing and that no part is stuck or jammed.
•
Disconnect the tool from the air supply, clean, and store it in a safe, dry, and childproof
location, when tool is not in use.
•When temperatures are below freezing, keep tools as warm as possible using any safe,
convenient method.
•Check the air supply for correct size and type of hose connectors. To avoid loss of power or
erratic action, ensure that there is no additional drain on the air line and no moisture or
restriction in the air pipe.
Troubleshooting
DANGER
If any of the following symptoms appear while the tool is in use, turn it off and
disconnect it from the air supply immediately.
Failure to comply will lead to serious injury or loss of life.
Disconnect the tool from the air supply before making any adjustments.
Repairs must be performed by a qualified service technician only.
The following chart lists common issues and solutions. Please read it carefully
and follow all instructions closely.
Problem
Possiblecauses
Solutions
Toolrunsatnormalspeedbutlosespowerunderload.
1.Wornordamagedmotorparts.2.Camclutchiswornorstuckduetoinsufficientlubrication
1.Lubricateclutchhousing.2.Checkforexcessclutchoilastheclutchrequiresonlyfiftypercentofoilfill.Over-fillingcancausedraggingofhigh-speedparts.Atypicaloiled/lubricateddiegrinderrequires1/2oz(15mL)ofoil.GreaseLubrication:Heatusuallyindicatesinsufficientamountofgrease.Severeoperatingconditionsmayrequirefrequentlubrication.

15
1282-943
PNEUMATIC1/4”DIEGRINDER
Problem
Possiblecauses
Solutions
Toolrunsslowlyandairflowsslightlyfromexhaust
1.Motorpartsarejammed.2.Powerregulatorisinclosedposition.3.Airflowisblockedduetodirt.
1.Checkfilterandairinletforblockage.2.Pourpneumatictooloilintoairinletasperinstructions.3.Operatethetoolinforwardand/orreverserotationswithinashortduration.Repeattheabovestepsasperrequirements.Ifthisfails,returnthetooltotheservicecenter.
Toolisnotrunning.Airflowsfreelyfromexhaust.
Motorvanesarestuckduetomaterialbuildup.
1.Pourpneumatictooloilintoairinlet.2.Operatethetoolinforwardand/orreverserotationwithinashortduration.3.Tapmotorhousinggentlywithplasticmallet.4.Disconnectthetoolfromtheairsupply.Operatethemotormanuallybyrotatingdriveshank(whereverapplicable).5.Iftoolremainsjammed,returntoservicecenter.
Tooldoesnotshutoff.
O-ringsorthrottlevalvearedislodgedfromseatvalve.
ReplaceO-ringsorreturntoserviceCentre.

16
EXPLODEDVIEW
22212019182517
1
32445
262728
2324
1413
106982912117
161530

17
1282-943
PNEUMATIC1/4”DIEGRINDER
PARTSLISTWARNING: Whenservicing,useonlyoriginalequipmentreplacementparts.Theuseofanyotherpartsmaycreateasafetyhazardorcausedamagetothetool.Anyattempttorepairorreplaceelectricalpartsonthistoolmaycreateasafetyhazardunlessrepairsareperformedbyaqualifiedtechnician.Formoreinformation,calltheToll-freeHelpline,at1-866-349-8665.AlwaysorderbyPARTNUMBER,notbykeynumber.
Key#
Part#
PartName
Qty
1
1282-943-001
HOUSING
1
2
1282-943-002
BEARING
1
3
1282-943-003
BACKCYLINDERHEAD
1
4
1282-943-004
JSPRINGPIN
2
5
1282-943-005
CYLINDER
1
6
1282-943-006
ROTOR
1
7
1282-943-007
BLADE
4
8
1282-943-008
WASHER
1
9
1282-943-009
FRONTCYLINDERHEAD
1
10
1282-943-010
PIN
1
11
1282-943-011
BEARING
1
12
1282-943-012
COLLETHOLDER
1
13
1282-943-013
LOCKINGRING
1
14
1282-943-014
LOCKFRONTPLATE
1
15
1282-943-015
1/4"COLLET
1
16
1282-943-016
COLLETNUT
1
17
1282-943-017
O-RING
1
18
1282-943-018
O-RING
1
19
1282-943-019
PIN
1
20
1282-943-020
TAPERSPRING
1
21
1282-943-021
O-RING
1
22
1282-943-022
NUT
1
23
1282-943-023
LEVER
1
24
1282-943-024
SPRINGPIN
1
25
1282-943-025
O-RING
1
26
1282-943-026
MUFFLECOVER
1
27
1282-943-027
O-RING
1
28
1282-943-028
AIRINLETPONNECTOR
1
29
1282-943-029
WRENCHES
2
30
1282-943-030
1/8"COLLET
1

18
WARRANTYBENCHMARK WARRANTY
If this Benchmark tool fails due to a defect in material or workmanship within
five years from the date of purchase, return it to any Home Hardware store
with the original bill of sale for exchange. 3-year warranty for the battery and
charger. This warranty does not include expendable parts including but not
limited to blades, brushes, belts, light bulbs. This warranty covers defects in
material or workmanship only. It does not cover normal wear and tear, failure
due to abuse/misuse, or defects caused by careless or accidental mishandling.
If this Benchmark product is used for commercial or rental purposes,
this warranty does not apply.

5YearLimitedWarranty
TMMCBENCHMARKTOOLSCANADAST.JACOBS,ONTARION0B2N0©2021HomeHardwareStoresLimitedCUSTOMERSERVICE/TECHSUPPORT1-866-349-8665
1282-943MadeinChina
*This BenchmarkTM product carries a five (5) year LIMITED warranty
against defects in workmanship and materials. See Owner’s Manual for full
details.
READ ALL INSTRUCTIONS BEFORE FIRST USE.
KEEP THIS MANUAL FOR FUTURE REFERENCE.
KEEP AWAY FROM CHILDREN.
WEAR CSA APPROVED
EYE PROTECTION
WEAR EAR
PROTECTION
WEAR A
FACE
MASK