3M 28825 User manual

1
Original Instructions
3
SANDER INSTRUCTION MANUAL
115 mm - 125 mm (4½ in - 5 in)
12,000 RPM
Important 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 pneumatic tool is intended for use in industrial locations, and used only by skilled, trained professionals in accordance with the instructions in this manual. This
pneumatic tool is designed to be used with appropriate abrasive for sanding metals, wood, stone, plastics and other materials. It should only be used for such sanding
applications and within its marked capacity and ratings. Only accessories specically recommended by 3M should be used with this tool. Use in any other manner or with
other accessories could lead to unsafe operating conditions.
Do not operate tool in water or in an excessively wet application.
Do not use abrasive products that have a Max RPM less than the RPM rating marked on the tool.
Summary of device labels containing safety information
Marking Description
WARNING: READ AND UNDERSTAND INSTRUCTION MANUAL BEFORE
OPERATING TOOL.
WARNING: ALWAYS WEAR APPROVED EYE PROTECTION
WARNING: ALWAYS WEAR APPROVED HEARING PROTECTION
Direction of Rotation
Prolonged vibration may cause injury Vibration Safety note
12,000 r/min. Maximum rotational speed
90 PSIG / 6.2 BAR MAX Maximum Air Pressure
Use accessories rated at tool speed or higher Accessories Speed Warning Note
Use appropriate guard Guard Safety Warning Note
Explanation of Signal Word Consequences
WARNING: Indicates a potentially hazardous situation which, if not avoided, may result in death or serious injury and/or property damage.
CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury and/or property damage.
WARNING!
Read the Safety
Data Sheets (SDS)
before using any materials.
Contact the suppliers of the
workpiece materials and
abrasive materials for copies
of the SDS if one is not
readily available.
Exposure to DUST generated from
workpiece and/or abrasive materials
can result in lung damage and/or other
physical injury.
Use dust capture or local exhaust as
stated in the SDS. Wear government-
approved respiratory protection and eye
and skin protection.
Failure to follow this warning can
result in serious lung damage and/or
physical injury.

2
WARNING
To reduce the risks associated with impact from abrasive product or tool breakup, sharp edges, hazardous pressure, rupture, vibration and noise:
• Read, understand and follow the safety information contained in these instructions prior to the use of this tool. Retain these instructions for future reference.
• Only personnel who are properly trained should be allowed to service this tool.
• Practice safety requirements. Work alert, have proper attire, and do not operate tool under the inuence of alcohol or drugs.
• Operators and other personnel must always wear protection for eyes, ears, and respiratory protection when in the work area or while operating this product. Follow
your employer’s safety policy for PPE’s and/or ANSI Z87.1 or local/national standards for eyewear and other personal protective
equipment requirements.
• Wear leather apron or other protective apparel, taking into consideration the type of work being done.
• Never exceed marked maximum input pressure (90psi / .62Mpa / 6.2Bars).
• Proper eye protection must be worn at all times.
• Tool shall not be operated in the presence of bystanders.
• If you notice any abnormal noise or vibration when operating the product, immediately discontinue its use and inspect for worn or damaged components. Correct or
replace the suspect component. If abnormal noise or vibration still exists, return the tool to 3M for repair or replacement. Refer to warranty instructions.
• Never operate this tool without all guards or safety features in place and in proper working order.
• Never over-ride or disable the safety features of the start-stop control such that it is in the on position.
• Make sure the tool is disconnected from its air source before servicing, inspecting, maintaining, cleaning, and before changing abrasive product.
• Prior to use, or if dropped or jammed, inspect mounting hardware, tool arbor and abrasive product for possible chips, cracks or other damage, and insure the
abrasive product is correctly secured. If damaged, or if safety labels cannot be read, replace with new abrasive product, mounting hardware, tool arbor, and/or labels available
from 3M.
• Only use accessories supplied or recommended by 3M.
• Use only with mounting hardware recommended by 3M; check with 3M for mounting hardware requirements.
• Never allow this tool to be used by children or other untrained people.
• Do not leave an unattended tool connected to air source.
To reduce the risk associated with skin abrasion, burns, cuts, or entrapment:
• Keep hands, hair, and clothing away from the rotating part of the tool.
• Wear suitable protective gloves while operating tool.
• Do not touch the rotating parts during operation for any reason.
• Do not force tool or use excessive force when using tool.
To reduce the risk of all hazards associated with vibration:
• If any physical hand/wrist discomfort is experienced, work should be stopped promptly to seek medical attention. Hand, wrist and arm injury may result from
repetitive work, motion and overexposure to vibration.
To reduce the risks associated with loud noise:
• Always wear protection for eyes, ears, and respiratory protection while operating this product. Follow your employer’s safety policy for PPE’s and/or
ANSI Z87.1 or local/national standards for eyewear and other personal protective equipment requirements.
• Always wear hearing protection while operating this tool. Follow your employer’s safety policy or local/national standards for personal protective
equipment requirements.
To reduce the risk associated with re or explosion:
• Do not operate the tool in explosive atmospheres, such as in the presence of ammable liquids, gases, or dust. The abrasives are able to create sparks when working
material, resulting in the ignition of the ammable dust or fumes.
• Refer to MSDS of material being worked as to potential for creating re or explosion hazard.
To reduce the risk associated with hazardous dust ingestion or eye/skin exposure:
• Use appropriate respiratory and skin protection, or local exhaust as stated in the MSDS of the material being worked on.
To reduce the risk associated with hazardous voltage:
• Do not allow this tool to come into contact with electrical power sources as the tool is not insulated against electrical shock.
CAUTION
To reduce the risk associated with whipping or hazardous pressure-rupture:
• Ensure supply hose is oil resistant and is properly rated for required working pressure.
• Do not use tools with loose or damaged air hoses or ttings.
• Be aware that incorrectly installed hoses and ttings might unexpectedly come loose at any time and create a whipping/impact hazard.
To reduce the risk associated with y off of abrasive product or parts:
• Use care in attaching abrasive product and mounting hardware; following the instructions to ensure that they are securely attached to the tool before use
or free-spinning.
• Never point this product in the direction of yourself or another person, or start tool unintentionally.
• Never over-tighten accessory fasteners.

3
Parts Page
Fig. 3M PN Description Qty
1 54069 Flange Nut, 5/8-11 2
2 54061 Autobalancer 1
3 54059 Retaining Ring 38 mm x 6 mm 1
4 54058 Felt Ring 32 mm x 4 mm 1
5 54057 Spindle 5/8-11 1
6 54055 Bearing, Main Spindle 1
7 54054 Gear Set 1
8 54060 Wick, Gear Oil 1
9 54053 Bearing, Top Spindle 1
10 54052 Circlip 1
11 54051 Oiler Screw 1
12 54081 O Ring 5.6 mm x 1 mm 2
13 54049 Handle Insert 1
14 54048 Side Handle, 2.5” x 6”, M10-1.5 1
15 54070 Spindle Lock Assembly 1
16 54050 Angle Head Housing 1
17 54089 Bearing, Motor 2
18 54090 Housing, Front Motor Bearing 1
19 54091 Cylinder, Motor 1
20 54092 Spacer, Rotor 1
21 54104 Key, Square 3 mm x 3 mm x 8 mm 1
22 54094 Rotor 1
23 54093 Rotor Vane Set of 4 1
24 54095 Housing, Rear Motor Bearing 1
25 54097 Governor 12K RPM 1
26 54071 Connector, Angle Head 1
27 54100 O Ring, 44 mm x 2 mm 1
28 54072 Air Inlet Tube 1
29 54073 Lock Ring 1
30 54074 Cover, Rear Handle Housing 1
Fig. 3M PN Description Qty
31 54075 Housing, Rear Handle 1
32 54080 Valve Stem,Throttle 1
33 54082 O Ring, 11 mm x 1.6 mm 1
34 54083 Insert, Throttle 1
35 06642 Safety Lever Assembly 1
36 54079 Pin, Safety Lever 1
37 54076 Throttle Insert 1
38 54103 O Ring, 20.5 mm x 2 mm 1
39 54077 Ball, Air Inlet 1
40 54078 Spring, Air Inlet 1
41 54102 Bushing, Air Inlet 1
42 54101 Filter, Air Inlet 1
43 54099 Screw, Exhaust M5 x 6 mm 2
44 54088 Cover, Exhaust 1
45 54098 Gasket, Exhaust 1
46 54087 Bafe, Exhaust 1
47 54086 Spring, Exhaust 2
48 54085 Piston, Exhaust 2
49 54084 Housing, Exhaust 2
50 54105 Wrench, Spanner, 4 mm x 30 mm B. C. 1
-- 54107 Rebuild Kit OPT
-- 54106 Tool Kit, Rebuild OPT
-- 28828 3M™ Air Tool Lubricant, 1 oz OPT
-- 20451 3M™ Air Tool Lubricant, 4 oz OPT
-- 20466 3M™ Air Tool and Compressor Lubricant,
Quart
OPT
-- 20467 3M™ Air Tool and Compressor Lubricant,
Gallon
OPT
-- 28827 3M™ Gear Oil, 4 oz OPT
Operation and repair notes:
Notes: FOR EQUIVALENT PARTS OF ALL TOOLS IN THESE
INSTRUCTIONS:
1. Items denoted by X in exploded view and highlighted gray in parts list
are included in Rebuild Kit PN 54107.
2. Items listed as OPT available separately.
3. Apply one drop, 3M™ Scotch-Weld™ thread locker (or equivalent
thread locking compound), type as noted, where indicated.
4. Saturate Wick (item 8), with 3M™ Gear Oil PN 28827 (or equivalent
68 centistoke oil) prior to assembly.
5. Bafe (item 46), can be cleaned and reused by soaking in solvent and
blowing dry with compressed air.
6. Lightly coat Vanes (item 23) and Cylinder (item 19) inner diameter with
3M™ Air Tool Lubricant PN 20451 (or equivalent 10 centistoke oil)
prior to assembly.
7. Handle Insert (item 13) and Spindle Lock Assembly (item 16) are
interchangeable, allowing attachment of Side Handle (item 14) on
either side of Angle Head (item 16), for right or left hand operation.
8. Exhaust Cover (item 44) is reversible, for right or left hand operation.
PARTS LIST FOR PN 28825, 12,000 RPM

4
Parts Page
PARTS LIST FOR PN 88577, 12,000 RPM
1
3
4
21
22
23
24
5
67
8
9
2
10 11 13 14
20
15 16 17
18
19
28
36 37
39
40 42
41
43 44
45
25
26
27
28
29
30
31
32
33
34
35
35
38
12 47
46
48
Fig. 3M PN Description Qty
1 54048 54048 Antivibration Side Handle 1
2 88773 Oiler Screw 1
3 88774 Side Handle Insert 1
4 88775 88775 Angle Head (Grinder) 1
4 88776 Angle Head (Housing) 1
5 88777 Plug Screw 1
6 88778 8 O Ring Plug Screw 1
7 88779 O Ring Valve Stem 1
8 88780 Valve Stem 1
9 88781 Moulded Sleeve 1
10 88782 Governor/Throttle Housing 1
11 88783 Throttle Insert 1
12 88784 O Ring Throttle Seat 1
13 88785 Throttle Ball 1
14 88786 Throttle Spring 1
15 88787 Lock Ring 1
16 88788 Bafe Material 3
17 88789 Throttle Hose Connector 1
18 54079 Lever Pin 1
19 88790 Filter, Air Inlet 1
20 88791 Lever 1
21 88792 Lock Pin Sleeve 1
22 88793 Lock Pin Spring 1
23 88794 Lock Pin 1
24 88795 Lock Pin Housing 1
25 54052 Circlip 1
Fig. 3M PN Description Qty
26 54053 Bearing 1
27 54060 Wick, Oil Grease 1
28 54054 Gear Set 1
29 54055 Bearing, Main Spindle 1
30 54057 Spindle 5/8-11 1
31 54058 Felt Ring 32 mm x 4 mm 1
32 54059 Retaining Ring 38 mm x 6 mm 1
33 54061 Autobalancer 1
34 54062 Guard Assembly (4.5") Grinder OPT
54063 Guard Assembly, Jumbo 4 1/2" OPT
54065 Guard Assembly, Standard 5" OPT
54066 Guard Assembly, Jumbo 5" OPT
35 54069 Flange Nut, 5/8-11 2
36 54089 Bearing Motor Front 1
37 88796 Front Bearing Housing 1
38 54092 Spacer, Rotor 1
39 88797 Cylinder 1
40 54104 Key, Square 3 mm x 3 mm x 8 mm 1
41 88798 Vane 4
42 88799 Rotor 1
43 88800 Rear Bearing Housing 1
44 88801 Rear Bearing 1
45 88802 Governor 1
46 88803 Exhaust Overhose OPT
47 NA Overhose Zip Tie Strap OPT
48 54105 Wrench, Spanner, 4 mm x 30 mm B. C. 1

5
Product Conguration / Specications
Model
Number
Rotation
Speed
(r/min)
Spindle
Size
Product
Net Wt
kg (lb.)
Air Consumption
l/min. (CFM)
Power kW (HP) *Noise Level
dBA Pressure
(Power)
**Vibration Level
m/s2(ft/s2)
**Uncertainty
K m/s2(ft/s2)
28825 12,000 5/8-11 2.2 (4.85) 1132.7 (40.0) 1.12 (1.5) 81.9 (90.2) 1.63 (5.35) 0.54 (1.77)
88577 12,000 5/8-11 2.1 (4.5) 1132 (40.0) 1.12 (1.5) 89 (97) 3.10 (10.2) 1.02 (3.34)
* Declared noise levels; measurements carried out in accordance with standard EN ISO 15744.
** Declared vibration levels in accordance with EN ISO 20643 and EN ISO 28927-3.
IMPORTANT NOTE: The noise and vibration values stated in the table are from laboratory testing in conformity with stated codes and standards and are not sufcient risk
evaluation for all exposure scenarios. The actual exposure values and amount of risk or harm experienced to an individual is unique to each situation and depends upon
the surrounding environment, the way in which the individual works, the particular material being worked, work station design, as well as upon the exposure time and
the physical condition of the user. 3M cannot be held responsible for the consequences of using declared values instead of actual exposure values for any individual risk
assessment.
Operating / Maintenance Instructions
PRIOR TO THE OPERATION
The tool is intended to be operated as a hand held tool. It is always recommended that while using the tool, operators stand on a solid oor, in a secure position with a rm
grip and footing. Be aware that the tool can develop a torque reaction. See the section in “SAFETY PRECAUTIONS”.
Use a clean lubricated air supply that will give a measured air pressure at the tool of 6.2 bar (90 psig) when the tool is running with the lever fully depressed. It is
recommended to use an approved 12.7 mm (1/2 in) x 8 m (25 ft) maximum length airline for tool 28825 or an approved 9.5 mm (3/8 in) x 8 m (25 ft) maximum length airline
for tool 88577. Connect the tool to the air supply as shown in Figure A. Do not connect the tool to the airline system without an easily accessible air shut off valve. It is strongly
recommended that an air lter, regulator and lubricator (FRL) be used as shown in Figure A as this will supply clean, lubricated air at the correct pressure to the tool. In any
case appropriate air pressure regulators shall be used at all times while operating this tool where the supply pressure exceeds the marked maximum of the tool. Details of
such equipment can be obtained from your tool distributor. Adjust air line lubricator equipment such that two drops of 3M™ Air Tool Lubricant PN 20451 (or equivalent 10
centistoke oil) per minute are provided through the hose to the air inlet of the tool. If excessive oil is noted in the exhaust air, reduce the drip rate of the air line lubricator
equipment accordingly. If such equipment is not used, the tool should be manually lubricated. To manually lubricate the tool, disconnect the airline and put two to three drops
of 3M™ Air Tool Lubricant PN 20451 (or equivalent 10 centistoke oil) into the air inlet of the tool. Reconnect tool to the air supply and run tool slowly for a few seconds to
allow air to circulate the oil. If the tool is used frequently, lubricate it on a daily basis or lubricate it if the tool starts to slow or lose power. It is recommended that the air
pressure at the tool be 6.2 bar (90 psig) while the tool is running so the maximum RPM is not exceeded. The tool can be run at lower pressures but should never be run higher
than 6.2 bar (90 psig). If run at lower pressure the performance of the tool is reduced.
Recommended Airline Size Recommended Maximum Hose Length Air Pressure
Model 28825
Model 88577
12.7 mm
9.5 mm
1/2 in
3/8 in
8 meters 25 feet Maximum Working Pressure
Recommended Minimum
6.2 bar
N/A
90 psig
N/A
Proper gear set lubrication is critical to maximizing tool life and performance. To lubricate the gear set inside the tool angle head, remove Oiler Screw (item 11) from Angle
Head (item 16) and add ve to ten drops of 3M™ Gear Oil PN 28827 (or equivalent 68 centistoke oil) to Wick (item 8) every eight hours of tool operation. If excessive oil is
noted on the Spindle (item 5) during operation, reduce the number of drops provided accordingly.

6
Description of Functions and Setting & Testing
PN 28825
PN 88577
3/8 NPT
SETTING & TESTING TOOL SPEED:
1. Ensure the Activation Lever is not depressed.
2. Connect the compressed air line.
3. Press the Activation Lever slowly and increase force until tool is at full speed.
4. Use a Rotary Tachometer to check the speed.
5. Check speed regularly.
Figure 1
Closed Loop Pipe System
Sloped in the direction of air flow
Drain Leg
Ball Valve
To Tool Station
Filter
Drain Valve
Regulator
Lubricator
Ball
Valve
Ball Valve Air Flow
Air Dryer
Air Compressor
and Tank
Air Hose
To Coupler
at or near Tool
Figure A
Safety Precautions
1. Read all instructions before using this tool. All operators must be fully
trained in its use and aware of these safety rules.
2. The tool RPM should be checked on a regular basis to ensure proper
operating speed.
3. Make sure the tool is disconnected from the air supply. Attach the 3M™
Abrasive to the sander adaptor using the wrenches supplied with the tool.
4. Always wear required safety equipment when using this tool.
5. When sanding always start the tool just prior to contacting the work piece.
Stop air ow to the tool as it is removed from the work piece.
6. Always remove the air supply to the sander before tting, adjusting or
removing the abrasive.
7. Always adopt a rm footing and grip and be aware of torque reaction
developed by the sander.
8. Use only 3M approved spare parts.
9. Always ensure the material being worked is rmly xed to avoid movement.
10. Check hose and ttings regularly for wear. Do not carry the tool by its hose;
always be careful to prevent the tool from being started when carrying the
tool with the air supply connected.
11. Dust can be highly combustible. Keep working area clean.
12. If tool is serviced or rebuilt check to ensure that the maximum tool RPM is
not exceeded and that there is no excessive tool vibration.
13. Do not exceed maximum recommended air pressure. Use safety equipment
as recommended.
14. Prior to installing any sanding or polishing accessory, always check that its
marked maximum operating speed is equal or higher than the rated speed
of this tool.
15. The tool is not electrically insulated. Do not use where there is a possibility
of contact with live electricity, gas pipes, and/or water pipes.
16. This tool is not protected against hazards inherent in grinding and cutting
operations, and no such cutting products should ever be attached.
17. Take care to avoid entanglement with the moving parts of the tool with
clothing, ties, hair, cleaning rags or loose hanging objects. If entangled,
stop air supply immediately to avoid contact with moving tool parts.
18. Keep hands clear of the spinning abrasive during use.
19. If the tool appears to malfunction, remove from use immediately and
arrange for service and repair.
20. Immediately release the start handle in the event of any disruption of
pressure; do not attempt to restart until the disruption has been corrected.
21. Do not allow the tool to free spin without taking precautions to protect any
persons or objects from the loss of the abrasive or pad ruptures.
22. When tool is not in use, store in a clean dry environment free of debris.
23. Operate tool in a well lit work area.
24. Recycle or dispose of tool according to Local, State, and Federal regulations.
25. Whenever performing maintenance procedures, use care to avoid exposure
to any hazardous substances deposited on the tool as a result of work
processes. Also, refer to warnings related to dust exposure.

7
Product Use: Many factors beyond 3M’s control and uniquely within user’s
knowledge and control can affect the use and performance of a 3M product in
a particular application. Given the variety of factors that can affect the use and
performance of a 3M product, user is solely responsible for evaluating the 3M
product and determining whether it is t for a particular purpose and suitable for
user’s method of application.
Warranty, Limited Remedy, and Disclaimer: Unless an additional warranty is
specically stated on the applicable 3M product packaging or product literature, 3M
warrants that each 3M product meets the applicable 3M product specication at the
time 3M ships the product. 3M MAKES NO OTHER WARRANTIES OR CONDITIONS,
EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY
OR CONDITION OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR
ANY IMPLIED WARRANTY OR CONDITION ARISING OUT OF A COURSE OF DEALING,
CUSTOM OR USAGE OF TRADE. If the 3M product does not conform to this warranty,
then the sole and exclusive remedy is, at 3M’s option, replacement of the 3M
product or refund of the purchase price.
Limitation of Liability: Except where prohibited by law, 3M will not be liable for
any loss or damage arising from the 3M product, whether direct, indirect, special,
incidental or consequential, regardless of the legal theory asserted, including
warranty, contract, negligence or strict liability.
Submitting a Warranty Claim: Contact your dealer when submitting a warranty
claim in accordance with the restrictions listed above. Please note that all warranty
claims are subject to manufacturer’s approval. Be sure to keep your sales receipt
in a safe place. This must be submitted when ling a warranty claim, within 1 year
from the date of purchase. For additional assistance call 1-800-362-3550.
Product Repair after Warranty Has Expired: Repair of 3M Abrasive Power tools
that are not under warranty is available through 3M or a 3M Authorized Tool Repair
Representative. Contact your 3M Abrasive Power Tool Distributor for details, or call
1-800-362-3550.
For 3M Product Information Call:
800-3M HELPS (800-364-3577) toll free
651-737-6501 direct dial
3
Abrasive Systems Division
3M Center
St. Paul, MN 55144-1000
www.3M.com/abrasives
© 3M 2021.
3M and Scotch-Weld are trademarks of 3M Company.
34-8715-6567-6
«F1» 1 - 2
EU DECLARATION OF CONFORMITY28825-88577 030821
Name and address of the manufacturer and, where applicable, his authorised representative:
3M Co., Abrasive Systems Division
3M Center, Building 223-6N-02
St Paul, MN USA 55144
This declaration of conformity is issued under the sole responsibility of the manufacturer.
Product model/product (product, type, batch or serial number):
Description: 3M™ Angle Sanders, 1 5 HP, 12,000, 115 mm –125 mm (4.5 in –5.0 in)
Model Number: 28825, 88577
Serial Number Range: 80000-00 –81999-99, where the first 2 digits represent the design of the unit,
the next 3 digits represent the sequence of manufacture, and the final 2 digits represent the yr of manufacture.
Object of the declaration :
Grinder with associated accessories
The object of the declaration described above is in conformity with the relevant Union harmonisation legislation:
Machinery Directive 2006/42/EC
References to the relevant harmonised standards used or references to the other technical specifications in
relation to which conformity is declared. References must be listed with their identification number and version
and, where applicable, date of issue:
Machinery Directive 2006/42/EC
EN ISO 12100:2010
EN ISO 11148-8:2011
EN ISO 28927-3:2009
EN ISO 15744:2009
List stds. and rev. dates
List stds. and rev. dates
«F1» 2 - 2
Where applicable, the notified body
Click to enter, name and number
performed
Click to enter, description of intervention
and issued the certificate:
Click to enter, name and certificate number
Where applicable, description of accessories and components, including software, which allow the radio equipment
to operate as intended and covered by the EU declaration of conformity:
Click to enter, description
Signed for and on behalf of:
03-08-2021
St. Paul, Minnesota, USA
Signature
Betty Z. Mei
Name of Signer
Technical Director
Title of Signer
Location of Technical File
Document Holder
Mr. Ivan Hristov - Hardware
Development Engineer, 3M Germany
GmbH Carl-Schurz-Str.1, 41453
Neuss Germany
Division/EBC/EBU
ASD Global Systems Lab, 3M
Central Europe Region
Phone [phone]
Original Language: English