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PARTS LIST FOR PN 28331 & 28346, Extended 18,000 RPM DIE GRINDERS
Parts Page
* Declared noise levels; measurements carried out in accordance with standard EN ISO 15744:2002.
** Declared vibration levels in accordance with EN12096; measurements carried out in accordance with standard EN ISO 8662-13:1997.
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
sufficient 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.
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 floor, in a secure position
with a firm grip and footing. Be aware that the sander can develop a torque reaction. See the section inSAFETY PRECAUTIONS in.
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 10 mm (3/8 in) x 8 m (25 ft) maximum length airline. Connect the tool to the air supply as shown in Figure 1. Do not connect
the tool to the airline system without an easily accessible air shut off valve. It is strongly recommended that an air filter, regulator and lubricator (FRL) be used
as shown in Figure 1 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 for your tool
distributor. If such equipment is not used, the tool should be manually lubricated. To manually lubricate the tool, disconnect the airline and put 2 to 3 drops of
suitable pneumatic motor lubricating oil such as 3M™ Air Tool Lubricant PN 20451, Fuji Kosan FK-20 or Mobil ALMO 525 into the hose end (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.
Product Configuration / Specifications
Operating / Maintenance Instructions
Model Number
Collet
Speed RPM
Product Net
Wt kg
(lb)
Height
mm (in)
Length mm
(in)
*Noise Lever
dBA Pressure
(Power)
**Vibration
Level m/s
2
(ft/s
2
)
**Uncertainty
K m/s
2
20237
25126
1/4 in
6 mm
20,000
0.77 (1.69)
0.77 (1.69)
76.2 (3)
76.2 (3)
196 (7.5)
196 (7.5)
83.5 (95.1)
83.5 (95.1)
< 2.5 (< 8.2)
< 2.5 (< 8.2)
NA
NA
20238
25127
1/4 in
6 mm
18,000
0.77 (1.69)
0.77 (1.69)
76.2 (3)
76.2 (3)
196 (7.5)
196 (7.5)
83.5 (95.1)
83.5 (95.1)
< 2.5 (< 8.2)
< 2.5 (< 8.2)
NA
NA
20239
25128
1/4 in
6 mm
12,000
0.93 (2.06)
0.93 (2.06)
81.2 (3.2)
81.2 (3.2)
254 (10)
254 (10)
83.5 (95.1)
83.5 (95.1)
3.62 (11.9)
3.62 (11.9)
1.81
1.81
20240
25129
1/4 in
6 mm
8,000
0.93 (2.06)
0.93 (2.06)
81.2 (3.2)
76.2 (3.2)
254 (10)
254 (10)
83.5 (95.1)
83.5 (95.1)
3.62 (11.9)
3.62 (11.9)
1.81
1.81
28332
28347
1/4 in
6 mm
4,000
0.717 (1.58)
0.717 (1.58)
69.9 (2.75)
69.9 (2.75)
200 (8.875)
200 (8.875)
87.0 (98.6)
87.0 (98.6)
5.52
5.52
0.732
0.732
28330
28345
1/4 in
6 mm
18,000
0.512 (1.13)
0.512 (1.13)
69.9 (2.75)
69.9 (2.75)
174.6 (6.875)
174.6 (6.875)
87.0 (98.6)
83.5 (95.1)
1.91
1.91
NA
NA
28331
28346
1/4 in
6 mm
18,000
0.697 (1.54)
0.697 (1.54)
69.9 (2.75)
69.9 (2.75)
269.9 (10.625)
269.9 (10.625)
87.0 (98.6)
87.0 (98.6)
2.53
2.53
0.295
0.295
Recommended Airline
Size - Minimum
10 mm 3/8 in
Recommended Maximum Hose Length
8 meters 25 feet
Air Pressure
Maximum Working Pressure 6.2 bar 90 psig
Recommended Minimum N/A N/A
Fig.
3M PN
Description
1
06572
Collet Nut
2
06575
Collet (1/4 in)
2
06573
Collet (1/8 in)
2
06574
Collet (3/16 in)
2
06545
Collet (3/8 in)
2
06576
Collet (3mm)
2
06577
Collet (6mm)
2
06546
Collet (8mm)
3
30371
Collet Body
4
06611
Ball Bearing (3)
5
30420
Clamp Nut
6
30421
Extension Shaft
7
30423
Pilot (.75 ID)
8
30392
Spring Washer (2)
9
06629
Front End Plate
10
06621
O-Ring
11
30418
Front End Plate Spacer
12
30422
Rotor
13
06647
Vane, Set of 4
14
06631
Cylinder Liner
15
30373
Motor Restricting Washer
Fig.
3M PN
Description
16
06630
Rear End Plate
17
06612
Ball Bearing
18
06625
Housing
19
30400
O-Ring
20
06626
Trigger Valve Stem
21
06616
Pin
22
06614
Compression Spring
23
06620
O-Ring
24
06627
Air Regulator
25
06613
Compression Spring
26
06622
Steel Ball
27
06599
Housing Cover, .5 HP
28
06635
Paddle Assembly
29
06617
Roll Pin
30
06632
Muffler Material
31
06615
Disc Spring
32
06628
Exhaust Deflector
33
06618
Inlet Bushing
34
06569
9/16 in x 3/4 in Wrench (2)
