manuals.online logo
Brands
  1. Home
  2. •
  3. Brands
  4. •
  5. 3M
  6. •
  7. Sander
  8. •
  9. 3M Buffer 8125 User manual

3M Buffer 8125 User manual

Other 3M Sander manuals

3M 88936 User manual

3M

3M 88936 User manual

3M 20244 User manual

3M

3M 20244 User manual

3M 10 User manual

3M

3M 10 User manual

3M 28547 User manual

3M

3M 28547 User manual

3M 28338 Operating and maintenance manual

3M

3M 28338 Operating and maintenance manual

3M 28342 User manual

3M

3M 28342 User manual

3M 20337 User manual

3M

3M 20337 User manual

3M ELITE SERIES User manual

3M

3M ELITE SERIES User manual

3M RANDOM ORBITAL SANDERS Operating instructions

3M

3M RANDOM ORBITAL SANDERS Operating instructions

3M 64392 User manual

3M

3M 64392 User manual

3M 33577 Operator's manual

3M

3M 33577 Operator's manual

3M File Belt Sander User manual

3M

3M File Belt Sander User manual

3M 28408 Manual

3M

3M 28408 Manual

3M 28333 User manual

3M

3M 28333 User manual

3M 28825 User manual

3M

3M 28825 User manual

3M 33573 Operator's manual

3M

3M 33573 Operator's manual

3M 28337 User manual

3M

3M 28337 User manual

3M 28341 User manual

3M

3M 28341 User manual

3M MINI RANDOM ORBITAL SANDER User manual

3M

3M MINI RANDOM ORBITAL SANDER User manual

3M 20230 User manual

3M

3M 20230 User manual

3M 33573 Operator's manual

3M

3M 33573 Operator's manual

3M PN 64384 User manual

3M

3M PN 64384 User manual

3M BLT-12 User manual

3M

3M BLT-12 User manual

3M Perfect-It 3MROP15 User manual

3M

3M Perfect-It 3MROP15 User manual

Popular Sander manuals by other brands

Dynabrade 51830 user manual

Dynabrade

Dynabrade 51830 user manual

FXA FXAJD2523 instruction manual

FXA

FXA FXAJD2523 instruction manual

Grizzly T33256 owner's manual

Grizzly

Grizzly T33256 owner's manual

Silverline 631320 User instructions

Silverline

Silverline 631320 User instructions

Black & Decker 7041 instruction manual

Black & Decker

Black & Decker 7041 instruction manual

DeWalt D26441 instruction manual

DeWalt

DeWalt D26441 instruction manual

OMCA SMR 930 Handbook

OMCA

OMCA SMR 930 Handbook

Schleifhexe BS 200 Original instructions

Schleifhexe

Schleifhexe BS 200 Original instructions

Ryobi RPS80 Original instructions

Ryobi

Ryobi RPS80 Original instructions

Oliver 6305 owner's manual

Oliver

Oliver 6305 owner's manual

Jet 22-44 Pro-3 Operating instructions and parts manual

Jet

Jet 22-44 Pro-3 Operating instructions and parts manual

Workzone 47561 user guide

Workzone

Workzone 47561 user guide

Makita M9204 technical information

Makita

Makita M9204 technical information

Makita M9204 instruction manual

Makita

Makita M9204 instruction manual

Clarke Woodworker CBS1-5B Operation & maintenance instructions

Clarke

Clarke Woodworker CBS1-5B Operation & maintenance instructions

Chicago Pneumatic CP9778 Operator's manual

Chicago Pneumatic

Chicago Pneumatic CP9778 Operator's manual

Ferm FEOS-135 user manual

Ferm

Ferm FEOS-135 user manual

Unior 1510 Operating	 instruction

Unior

Unior 1510 Operating instruction

manuals.online logo
manuals.online logoBrands
  • About & Mission
  • Contact us
  • Privacy Policy
  • Terms and Conditions

Copyright 2025 Manuals.Online. All Rights Reserved.

1
3M
Buffer 8125
Owner’s Manual
A table of contents:
A. SAFETY INFORMATION 1
B. OPERATING INSTRUCTION 4
C. SPARE PARTS INFORMATION (exploded view) 5
D. DISASSEMBLY METHOD 7
E. ASSEMBLY METHOD 10
F. GUIDELINE FOR PARTS EXCHANGE 11
G. PARTS DEPO AND REPAIR SERVICE 12
Appendix. – TROUBLESHOOTING CHART
A. SAFETY INFORMATION
Please read, understand, and follow all safety information contained in these instructions prior to the use of this tool.
Retain these instructions for future reference.
Intended Use:
This tool is designed as a buffing solution for repairing automobile bodies and parts, clear coat painting on metal, fiber
reinforced plastic (RFP) and wood. It should not be operated in water or in an excessive wet application.
Explanation of Signal Word Consequences
Indicates a potentially hazardous situation which, if not avoided, may result in death or serious injury
and/or property damage.
Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury and/or property damage.
WARNING:
CAUTION:
2
To reduce the risks associated with excessive pneumatic pressure, noise, vibration, eye/skin irritation, and tool breakage during
the use of this product:
•Readandfollowthesafetyinformationcontainedintheseinstructionspriortotheuseofthistool.Retaintheseinstructionsforfuture
reference.
•Alwayswearprotectionforeyes*andearswhileoperatingthisproduct.FollowANSIZ87.1orlocal/nationalstandardsforeyewearand
other personal protective equipment requirements.
•Neverexceedmaximuminputpressureof90PSI(6.2bar).
•Neverpointthistoolinthedirectionofyourbodyorthatofanotherperson.
•Ifyounoticeanyabnormalnoiseorvibrationwhenoperatingtheproduct,immediatelydiscontinueitsuseandreturntothemanufacturer
for service or repair. Refer to warranty instructions.
•Discontinueuseofthetoolifabnormalhand/wristdiscomfortisexperienced.Ifdiscomfortcontinuesseekmedicalattention.
•UsedustcaptureorlocalexhaustasstatedintheMSDS.
•UsecareinfasteningHookit™DiscBackupPadtoensurethatitissecurelyattachedtothetoolbeforeuse.
•Makesurethetoolisdisconnectedfromtheairsourcebeforecleaning,inspecting,servicingorchanginganyparts.
WARNING
•Toreducetheriskofskinabrasion,cutsorburns,donottouchrotatingpartsduringoperationforanyreason.
CAUTION
•Improperusecancausethetooltobreakapartandmaycauseinjurytooperatorsandbystanders.
•Neverfreespinthetoolorallowittobestartedunintentionally.
•Neveroperatethetoolwithoutallguardsorsafetyfeaturesinplaceandinproperworkingorder.
•Inspectbackuppadandreplaceifunusualwearisnoticed.
•Replacebackuppadatnormalintervalsaccordingtoinstructions.
CAUTION
Motor
RPM
Orbit Dia. Air Flow Air
Pressure
Weight Pad Size Noise Vibration Length Height
10,500 0.472 in
(12 mm)
380LPM
(13.4 SCFM)
90PSI
(6.2bar)
2.09lbs
(0.95kg)
2.83in
(72 mm)
80dBA 1.34–1.46
m/s2
91/8in
(232 mm)
35/8in
(93mm)
*For information on eye and face protection, see ANSI Standard Z87.1,
“Practice for Occupational and Educational Eye and Face Protection”.
Available from American National Standards Institute, Inc., 1430 Broadway,
New York, NY 10018. +1 (212) 642-4900.
3
HOW TO HANDLE
•Checkforloosescrewsandmissingpartsbeforeoperation.
•Connectairhosesaftercleaningallappropriatettingstoreducecontaminationfromforeignobjects,dust,sand,etc.
•Duringinspectionofeachpartmakesuretodetachairhoses.
•Whenconnectingairhoseswithanairtool,donotsqueezethetrigger.
•Donotthrowthetool.
•Donotdragthetoolwhileholdingtheairhose.
•Donotusethetoolinanon-recommendedapplication.
•Operationwithoutlubricationwillcauserapidwearonthemotorandcanleadtorotationfailure.
•Priortostoring,lubricatethetoolatalowspeedtospreadoilinsidethemotor.
•Selectadryandsafeplaceforstorage.
•Frequentcleaningofairconnectionswillreducecontaminationofthemotor.
•Abnormalnoiseorvibrationduringoperationindicatesanimmediateneedfortoolrepair.
•Ifrepairisnecessarynotifysalesofceorrepaircenterfromwhereyoupurchasedthistoolregardinginspectionandrepair.
•Useonlyrecommendedreplacementparts.
PRIOR TO OPERATION
•Keeptheworkareaclean,orderlyandfreeofobstacles.
•Inspectforlooseparts(toolandattachment)priortooperation.
•Conrmthatairpressuredoesnotexceed90PSI/6.2bar.
•Whenconnectingtoanairhoseensureasecureconnectionthatwillnotloosenduringoperation.
•Centerthebufngpadonthebackuppad.
•Pressthebufngpadsecurelyintoplace.
START AND STOP
•Placethetoolincontactwiththeworkpiece.
•Startthetoolbypressingthelever/triggerlightly.
•Keepthetoolatwhileincontactwiththeworksurface.
•Slowthetooldownbeforeremovingfromtheworkpiece.
•Detachairhosewhenthetoolisnotinuse.
•Detachthetoolfromtheairsourcewhentransporting.
DURING OPERATION
•Speedcanbeadjustedfromlowtohighwiththespeedcontrollerknob.
•Donotapplyexcessiveforcetothetool.Excessiveforcecanleadtoinefcienttoolperformanceanddecreasedtoollife.
B. OPERATING INSTRUCTIONS
PRIOR TO OPERATION
•Makesuretheworkplaceisneatandisinappropriatecondition.
•Checkforlooseparts(pad,etc.).
•Makesuretheairpressureisappropriatelessthan90PSI(6.2bar).
•Whenacouplerorextensionisused,besureitistightsothatitwillnotcomeloosebecauseofvibration,etc.
START OF OPERATION
•Thetoolstartswhentheleverispressed.Itstopswhentheleverisreleased.Whenyouwork,besuretooperatetheleverafterthebufng
padcontactstheworksurface.
4
PRIOR TO OPERATION AND AFTER OPERATION
•Besuretooilthetoolmotorthroughtheairsupplyopening.Afteroiling,runthetoolatlowspeed.
•Whennotinproduction,removeairhoseandstoreinsafe,dryplace.
5
12
3
4
5
6
7
8
10
11
12
13
14
15
16-3
16-416-2
16-1
16-3
17
18
20
28
27
26
25
24
23
21
22 29
31
30
32
33
19
9
Parts Page
6
C. SPARE PARTS INFORMATION - continued
ITEM No. PART No. DESCRIPTION QTY
1 410320 Spring pin ( 3” x 20”) 1
2  22975A  Valvelever  1
3  OV12  Snapring(OV-12) 1
4  20820  Valvepinsleeve  1
5  KS07  Oring(KS-7)  1
6  KS02  Oring(KS-2)  1
7  20823  Valve   1
8  25814  Valvespring  1
9  229013A Body   1
10  22952  Silencer  2
11  22953  Silencercap  1
12 130512 Screw (M5 x 12”) 1
13  3805  Washer(M5)  1
14  6000ZZ  Ballbering(6000ZZ) 1
15  207083  U-baringcase  1
16  216031A Cylinderset  1set
16-1  216031  Cylinderset  1
16-2  KS05  O-ring(KS-5)  1
16-3  410308  Springpin(3”x8”) 2
16-4  410304  Springpin(3”x4”) 1
17  22621  Rotor   1
18  22622  Vane   8
19  22342  L-bearingcase  1
20  6300ZZ  Ballbearing(6300ZZ) 1
21 22340 Shaft with head 1
22  510313  H/Rkey(13”x3”) 1
23  20913  Retainerbolt  1
24  6001DD Ballbearing(6001DD) 2
25  22309  18feltring  1
26  22308  Dustseal  1
27 22341 Pad retainer 1
28  OV28  Snapring(OV-28) 1
29  22907  Bodygasket  1
30  22951  Basering  1
31  22908  Dustpacking  1
32 150412 Screw (M4 x 12) 4
33  *  3”pad  1
* 3M™ Disc Pad 00-51111-55764-8
Special Tools for repair operation
ITEM No. PART No. DESCRIPTION QTY
1  ST005  6200bearingpunch 1
2 ST007 3 mm pin punch 1
3  ST008  945Ashaftbearingpuller 1
4 ST024 Bearing puller stand 1
5 ST502 Snap ring pliers 1
7
D. DISASSEMBLY METHOD
Remove the air hose before disassembling the tool. Disassembly while the air hose is still attached is very dangerous.
CAUTION
1. Remove pad holder.
Use the attached spanner to remove the pad. Secure the pad retainer (27) and rotate the pad (33)
inthecounterclockwisedirection.
2. Removing the Base Ring
Removefourscrews(32)andremovethebasering(30).Removethebodygasket(29).
3. Disassembly of the Motor
Remove the motor assembly. Remove the screw (12) from the up-
per end of the motor assembly.
Remove the ball bearing as well as
theU-bearingcase(14&15).
8
Remove the ball bearing (14)
using a special puller.
Removethecylinderset(16). Removethevanes(18).
Remove the ball bearing (14)
using a special puller.
RemovetheH/Rkey(22). TheL-bearingcaseandtheballbearing
(19&20)areremovedusingaplastichammer
so that the shaft (21) will not be damaged.
Theballbearing(20)isremovedfromtheL-bearingcase(19)usingaspecialpuller.
Removethesnapring(28)from
the shaft assembly.
Remove the pad retainer assembly
using a special tool.
Clamp the pad retainer (27) in a vise
and remove the retainer bolt.
9
Remove the ball bearing (24)
using a special tool.
Removethedustseal(26)andthe
18Diafeltring(25).
4. Disassembly of the Valve
Removethedustseal(26)and
f18diameterfeltring(25).
Using a snap ring tool, remove the
snap ring (3).
Remove the valve pin sleeve and the
O-ringKS-7(4&5)togetherwiththe
O-ringKS-2andthevalve(6&7).
Be careful not to lose the valve spring.
RemovetheO-ringKS-2andthe
valve(6&7)fromthevalvepin
sleeveandtheO-ringKS-7(4&5).
RemovetheO-ringKS-7(5)outfrom
the valve pin sleeve (4).
RemovetheO-ringKS-2(6)from
the valve (7).
10
ST502
ST005 ST008
ST024
ST007
1) ST005  6200bearingpunch
2) ST007 3 mm pin punch
3) ST008  945Ashaftbearingpuller
4) ST024 Bearing puller stand
5) ST502 Snap ring pliers
5. Special tools for the repair operation (to help the disassembly)
E. ASSEMBLY METHOD
•Beforeassembly,inspecteachpartforwearordamage.
•Useonlyrecommendedspareparts.
•Applyoillightlyoneachpart.
•ExchangedamagedOrings.DonotomittheOrings.
•Applygrease(generalpurposegrease).
•Assemblethepartscarefullyinthereverseorderfromthedisassembly.
•Assemblethemotor,payingspecialattentiontotherequiredupperandlowerclearance.
•Whenassemblyisnished,checkforloosescrews,etc.
•Pourafewdropsofairtooloilintotheairinletpart,andrunataslowspeed.
•Checkthatitrotatesfreely.