Florida Pneumatic FP-3751R Manual
Florida Pneumatic Manufacturing Corporation
851 Jupiter Park Lane | Jupiter, Florida 33458 |Toll Free (800) 356-3392
Air Tool Safety
FLORIDA-PNEUMATIC.COM
Please contact 1-800-356-3392 for further assistance.
FP-3751R
1/4” Die Grinder
DIE GRINDERS
General Safety Information & Replacement Parts
WARNING: Risk of injury to persons. Read and
understand operation instructions. Always become familiar
with all the instructions and warnings before operating any
pneumatic tool.
General Safety Information ...........................2
Air Compressor and Air Tool Safety...................2-3
Tool Specifications ..................................3
Installation ........................................4
Maintenance / Lubrication ............................4
Troubleshooting ....................................5
Warranty ..........................................5
Service Parts.......................................6
TABLE OF CONTENTS
WARNING:This product contains chemicals known to
the State of California to cause cancer and birth defects or
other reproductive harm. Wash hands after handling.
WARNING:This product contains lead, a chemical known to
the State of California to cause cancer and birth defects or
other reproductive harm. Wash hands after handling.
FP Air Tools - Florida-Pneumatic Manufacturing Corporation
851 Jupiter Park Lane, Jupiter FL 33458
7.2.2.3 GENERAL SAFETY RULES
• Multiplehazards.Readandunderstandthesafetyinstructionsbefore
installing,operating,repairing,maintaining,changingaccessorieson,
orworkingnearthepowertool.Failuretodosocanresultinserious
bodilyinjury.
• Onlyqualiedandtrainedoperatorsshouldinstall,adjustorusethe
powertool.
• Donotmodifythispowertool.Modicationsmayreducetheeffec-
tivenessofsafetymeasuresandincreasetheriskstotheoperator.
• Donotdiscardthesafetyinstructions–givethemtotheoperator.
• Donotuseatoolifthetoolhasbeendamaged.
• Warningsshallbegivenagainsttheriskofexplosionorreduetothe
materialbeingprocessed;
• Warningsshallbegivenagainsttheriskofcutting.
7.2.2.4 PROJECTILE HAZARDS
• Failureoftheworkpiece,ofaccessories,orevenofthetoolitselfmay
generatehighvelocityprojectiles.
• Alwayswearimpact-resistanteyeprotectionduringoperationofthe
tool.Thegradeofprotectionrequiredshouldbeassessedforeach
use.
7.2.2.5 ENTANGLEMENT HAZARDS
• Entanglementhazard-choking,scalpingand/orlacerationscanoccur
ifneckware,hairorglovesarenotkeptawayfromtoolandacces-
sories.
7.2.2.6 OPERATING HAZARDS
• Useofthetoolmayexposetheoperator’shandstohazardsincluding
crushing,impacts,cutsandabrasionsandheat.Wearsuitablegloves
toprotecthands.
• Operatorsandmaintenancepersonnelmustbephysicallyableto
handlethebulk,weightandpowerofthetool.
• Holdthetoolcorrectly:bereadytocounteractnormalorsudden
movements–havebothhandsavailable.
• Maintainabalancedbodypositionandsecurefooting.
• Keephandsawayfromrotatingorreciprocationaccessories,spindles
orothermovingparts.
• Releasethestartandstopdeviceinthecaseofaninterruptionofthe
energysupply
• Useonlylubricantsrecommendedbythemanufacturer.
7.2.2.7 REPETITIVE MOTIONS HAZARDS
• Whenusingapowertool,youmayexperiencediscomfortinyour
hands,arms,shoulders,neck,orotherpartsofyourbody.
• Whileusingapowertool,positionyourbodyinacomfortable
posture.Maintainsecurefootingandavoidawkwardoroff-balanced
postures.Changingyourpostureduringextendedtasksmayhelp
avoiddiscomfortandfatigue.
• Ifyouexperiencesymptomssuchaspersistentorrecurringdiscom-
fort,pain,throbbing,aching,tingling,numbness,burningsensation,
orstiffness,donotignorethesewarningsigns.Promptlytellyour
employerandconsultaqualiedhealthprofessional.
7.2.2.8 ACCESSORY HAZARDS
• Onlyusesizesandtypesofaccessoriesandconsumablesthatare
recommendedbythepowertoolmanufacturer.
7.2.2.9 WORKPLACE HAZARDS
• Slips,tripsandfallsaremajorcausesofworkplaceinjury.Beaware
ofslipperysurfacescausedbyuseofthetoolandalsooftriphazards
causedbytheairlineorhydraulichose.
• Proceedwithcareinunfamiliarsurroundings.Hiddenhazardsmay
exist,suchaselectricityorotherutilitylines.
• Thispowertoolisnotintendedforuseinpotentiallyexplosiveatmo-
spheresandisnotinsulatedfromcomingintocontactwithelectric
power.
• Makesuretherearenoelectricalcables,gaspipesetc.thatcould
causeahazardifdamagedbyuseofthetool.
7.2.2.10 DUST AND FUME HAZARDS
• Dustfromsomeworkprocessescancausecancer,birthdefectsor
otherrespiratorydiseases.Riskassessmentofthesehazardsand
implementationofappropriatecontrolsisessential.
• Ifthepneumatictoolisusedinadustlledenvironmentexhaust
aircancauseadusthazard
• Dustsandfumesgeneratedwhenusingpowertoolscancause
illhealth(forexample:cancer,birthdefects,asthmaand/order-
matitis);riskassessmentofthesehazardsandimplementationof
appropriatecontrolsofisessential.
• Riskassessmentshouldincludedustcreatedbytheuseofthetool
andthepotentialfordisturbingexistingdust.
• Operateandmaintainthepowertoolasrecommendedinthese
instructions,tominimizedustorfumeemissions
• Directtheexhaustsoastominimizeddisturbanceofdustinadust
lledenvironment
• Wheredustsorfumesarecreated,thepriorityshallbetocontrol
thematthepointofemission.
• Allintegralfeaturesoraccessoriesforthecollection,extractionor
suppressionofairbornedustorfumesshouldbecorrectlyused
andmaintainedinaccordancewiththemanufacturer’sinstructions.
• Select,maintainandreplacetheconsumable/insertedtoolas
recommendedintheseinstructions,topreventanunnecessary
increaseindustorfumes
• Userespiratoryprotectionasinstructedbyyouremployeroras
requiredbyoccupationalhealthandsafetyregulations;
7.2.2.11 NOISE HAZARDS
• Unprotectedexposuretohighnoiselevelscancausepermanent,
disabling,hearinglossandotherproblemssuchastinnitus(ring-
ing,buzzing,whistlingorhummingintheears);
• Riskassessmentofthesehazardsandimplementationofappropri-
atecontrolsofisessential.
• Appropriatecontrolstoreducetheriskmayincludeactionssuchas
dampingmaterialstopreventworkpiecesfrom‘ringing’
• Usehearingprotectionasinstructedbyyouremployeroras
requiredbyoccupationalhealthandsafetyregulations;
• Operateandmaintainthepowertoolasrecommendedinthese
instructions,topreventanunnecessaryincreaseinnoiselevels;
• Select,maintainandreplacetheconsumable/insertedtoolas
recommendedintheseinstructions,topreventanunnecessary
increaseinnoise.
7.2.2.12 VIBRATION HAZARDS
• Exposuretovibrationcancausedisablingdamagetothenerves
andbloodsupplyofthehandsandarms;
• Wearwarmclothingwhenworkingincoldconditionsandkeep
yourhandswarmanddry;
• Ifyouexperiencenumbness,tingling,painorwhiteningoftheskin
inyourngersorhands,stopusingthepowertool,andtellyour
employer.Youshouldalsoseekmedicaladvicefromaqualied
occupationalhealthprofessional.
• Operateandmaintainthepowertoolasrecommendedinthese
instructions,topreventanunnecessaryincreaseinvibration;
• Select,maintainandreplacetheconsumable/insertedtoolas
recommendedintheseinstructions,topreventanunnecessary
increaseinvibrationlevels;
• Supporttheweightofthetoolinastand,tensionerorbalancer,
becausetheoperatorcanthenusealightergriptosupportthetool.
• Holdthetoolwithalightbutsafegriptakingaccountofthe
requiredhandreactionforces,becausetheriskfromvibrationis
generallygreaterwhenthegripforceishigher.
7.2.3ADDITIONAL SAFETY INSTRUCTIONS FOR PNEUMATIC
POWER TOOLS - AIR SUPPLY & CONNECTION HAZARDS
• Airunderpressurecancausesevereinjury.
• Alwaysshutoffairsupply,drainhoseofairpressureanddiscon-
necttoolfromairsupplywhennotinuse,beforechangingacces-
soriesorwhenmakingrepairs.
• Neverdirectairatyourselforanyoneelse.
• Whippinghosescancausesevereinjury.Alwayscheckfordam-
agedorloosehosesandttings.
• Wheneveruniversaltwistcouplings(clawcouplings)areused,lock
pinsmustbeinstalled.
• Donotexceedthemaximumairpressurestatedonthetool.
• Usewhipchecksafetycablestosafeguardagainstpossiblehoseto
toolandhosetohoseconnectionfailure.
• Nevercarryanairtoolbythehose.
Safety Information
FLORIDA-PNEUMATIC.COM
Please contact 1-800-356-3392 for further assistance.
Safety Information (continued)
AIR COMPRESSOR AND AIR TOOL SAFETY
1. Risk of Bursting. Do not adjust the regulator to result in output
pressure greater than the marked maximum pressure of this air
tool.
2. Ensure the hose is free of obstructions or snags. Entangled or
snarled hoses can cause loss of balance or footing and may
become damaged.
3. Never leave a tool unattended with the air hose attached.
4. Do not operate this tool if it does not contain a legible warning
label.
5. Do not continue to use a tool or hose that leaks air or does not
function properly.
6. Never direct a jet of compressed air toward people or animals.
7. Protect your lungs. Wear a face or dust mask if the operation is
dusty.
WARNING: 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
and cement and other masonry products, arsenic and
chromium from chemically-treated lumber.
Your risk from those exposures 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 dust masks that
are specically designed to lter out microscopic particles.
Important Warnings - Die Grinders
Specications
Description Model No.
Free
Speed
RPM
Collet/
Chuck Size
(in.)
Motor
HP
Weight
(lbs.)
Length
(in.)
Air
Inlet
(NPT)
Rec. Hose
Size
(in.)
Rec.
Air
Pres.
Air
Cons.
(cfm)
1/4” Die Grinder FP-3751R 20,000 1/4 1/3 1.5 5-1/2 1/4 3/8 I.D. 90 psi 4
1. Only use mounted grinding stones or mounted carbide burrs that meet ANSI standards, ISO standards or both.
2. Never adjust the die grinder, adjust the collets or change the mounted stones or mounted burrs unless the air supply and air hose is
disconnected from the die grinder.
3. Only personnel trained in the correct methods to adjust collets and change mounted stones and mounted burrs should conduct these
operations.
4. Always ensure that you are aware of the direction of the sparks being created by the grinding operation and ensure that the sparks are
not directed toward the operator or other persons in the area.
5. Never use a die grinder close to any explosive or ammable materials or air conditioners.
6. Only use mounted stones or carbide burrs that have the correct spindle diameter that matches the original collet size provided by the die
grinder manufacturer.
7. Particular care must be taken not to use metric size mounted stones and mounted burrs with die grinders that have imperial size collets,
or use imperial mounted stones and mounted burrs with die grinders that have metric collets.
FP Air Tools - Florida-Pneumatic Manufacturing Corporation
851 Jupiter Park Lane, Jupiter FL 33458
Installation
1 Cleaning the air hose
□A 3/8" air hose is required, with a maximum length of 25 ft.
□Clean the air hose of accumulated dust and moisture
before connecting it to the air supply.
NOTE: If a longer air hose is required, connect a 1/2" air
hose to the 3/8" air hose to ensure the die grinder has the
necessary air supply.
Recommended Air Line Set-Up
Part Description
AAir Tool
B Quick Plug
C Quick Coupler
D Air Hose
E In-line Regulator
F In-line Lubricator
G In-line Filter
H Air Compressor
Ensure the air line is shut-off and drained of air before removing this tool for service or changing sockets. This will prevent the tool from
operating if the throttle is accidentally engaged.
LUBRICATION
□An in-line lter-regulator-lubricator is recommended as it increases tool life and keeps the tool in sustained operation.
□Regularly check and ll the in-line lubricator with air tool oil. Avoid using excessive amounts of oil.
□Adjust the in-line lubricator by placing a sheet of paper next to the tool’s exhaust ports and holding the throttle open approximately 30
seconds. The lubricator is properly set when a light stain of oil collects on the paper.
□If it is necessary to store the tool for an extended period of time (overnight, weekend, etc.), generously lubricate the tool through the air
inlet. Run the tool for approximately 30 seconds to ensure the oil is evenly distributed throughout the tool. Store the tool in a clean and
dry environment.
□Recommended lubricants: Air tool oil or any other high grade turbine oil containing moisture absorbent, rust inhibitors, metal wetting
agents, and an EP (extreme pressure) additive.
Maintenance
FLORIDA-PNEUMATIC.COM
Please contact 1-800-356-3392 for further assistance.
Troubleshooting
Problem Possible Cause Solution
The tool runs slowly or will not
operate.
There is grit or gum in the tool. Flush the tool with air tool oil or gum solvent.
The tool is out of oil. Lubricate the tool according to the lubrication
instructions in this manual.
The air pressure is low. □Adjust the regulator on the tool to the
maximum setting.
□Adjust the compressor regulator to the tool’s
maximum setting of 90 psi.
The air hose leaks. Tighten and seal the hose ttings with pipe thread
tape if leaks are found.
The air pressure drops. □Ensure the hose is the proper size. Long
hoses or tools using large volumes of air may
require a hose with an I.D. of ½" or larger
depending on the total length of the hose.
□Do not use a multiple number of hoses
connected together with a quick connect
tting. This causes additional pressure drops
and reduces the tool power. Directly connect
the hoses together.
There is a worn rotor blade in the motor. Replace the rotor blade.
There is a worn ball bearing in the motor. Remove and inspect the bearing for rust, dirt, and
grit. Replace or clean and grease the bearing with
bearing grease.
There is moisture blowing out
of the tool’s exhaust.
There is water in the tank. Drain the tank. (See the air compressor manual
for instructions.) Lubricate the tool and run it until
water is not evident. Lubricate the tool again and
run for 1-2 seconds.
Limited Warranty
Florida Pneumatic Manufacturing Corporation warrants its tools to be free from defects in materials and workmanship. Tools thought
to be defective should be returned to the factory, or an authorized service center, transportation charges prepaid, for examination and
consequent repair or replacement. This warranty does not cover damage to tools arising from alteration, abuse, or use for other than their
intended purpose and does not cover any repairs or replacement made by anyone other than Florida Pneumatic Manufacturing Corporation
or its authorized repair stations.
The duration of the Warranty and any other Warranty including, but not limited to, any implied Warranty of merchantability is expressly
limited to two years, beginning from the date of the delivery to the original user. The obligation of Florida Pneumatic Manufacturing
Corporation under any Warranty, express or implied, is limited solely to the repair or replacement at its factory or authorized repair station
of any part which shall prove defective.
FP Air Tools - Florida-Pneumatic Manufacturing Corporation
851 Jupiter Park Lane, Jupiter FL 33458
Service Parts / Exploded View Drawing
Reference
Number
Part Number Description Qty. Reference
Number
Part Number Description Qty.
1 106120 Hose Adapter 1 12 103092 Cage 1
2 106280 Mufer Disk 1 13 116162 Rotor 1
3 118010 Valve Spring 1 14 116260 Rotor Vanes 4
4 120480 Tip Valve 1 15 113200 Front End Plate 1
5 115170 Washer 1 16 8729113 Front Bearing 1
6 111230 Lever Spring Pin 1 17 108120 Lock Nut 1
7 260348 Handle Assembly
(Includes Washer -
115170)
1 21 5910 Collet Assembly
(Includes Ref. 18, 19, 20)
1
8 120490 Valve Pin 1 18 107310 Collet Body 1
9 120510 Lever Assembly 1 19 5909 Collet Insert 1
10 81010183 Rear Bearing 1 20 5901 Collet Nut 1
11 113190 Rear End Plate 1
Not Shown 266040 Comfort Grip 1
Not Shown 120500 Pro Vale Pin Bushing 1
21
FLORIDA-PNEUMATIC.COM
Please contact 1-800-356-3392 for further assistance.
Reference
Number
Part Number Description Qty. Reference
Number
Part Number Description Qty.
1 106120 Hose Adapter 1 12 103092 Cage 1
2 106280 Mufer Disk 1 13 116162 Rotor 1
3 118010 Valve Spring 1 14 116260 Rotor Vanes 4
4 120480 Tip Valve 1 15 113200 Front End Plate 1
5 115170 Washer 1 16 8729113 Front Bearing 1
6 111230 Lever Spring Pin 1 17 108120 Lock Nut 1
7 260348 Handle Assembly
(Includes Washer -
115170)
1 21 5910 Collet Assembly
(Includes Ref. 18, 19, 20)
1
8 120490 Valve Pin 1 18 107310 Collet Body 1
9 120510 Lever Assembly 1 19 5909 Collet Insert 1
10 81010183 Rear Bearing 1 20 5901 Collet Nut 1
11 113190 Rear End Plate 1
Not Shown 266040 Comfort Grip 1
Not Shown 120500 Pro Vale Pin Bushing 1
Questions, problems, missing parts?
Call Customer Service
8 a.m.-5 p.m., EST, Monday-Friday
1-800-356-3392
FLORIDA-PNEUMATIC.COM
Retain this manual for future use.
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