Fein WSg 20-180 Setup guide

Grinding
34130529060
Printed in Germany
Repair instructions
Applies to:
WSG 20-180; WSG 20-230; WSG 25-180; WSG 25-230;
WSB 20-180; WSB 20-230; WSB 25-180 X; WSB 25-230 X

Grinding
34130529060
Printed in Germany
Contents
C-SC_CSSM
Version 1.0
10.03.2021
Page 2of 73
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FEIN retains all rights of disposal, such as copying and circulation.
Contents
1Models described..............................................................................................................................4
2Technical data...................................................................................................................................5
3Symbols used....................................................................................................................................6
4Notes and requirements....................................................................................................................7
5Safety instructions.............................................................................................................................8
6Tools, lubricants and auxiliary substances required.........................................................................10
6.1 Standard tools..........................................................................................................................10
6.2 Special tools.............................................................................................................................10
6.3 Lubricants and auxiliary substances required...........................................................................11
7Test and diagnostics options...........................................................................................................12
8Disassembly....................................................................................................................................13
8.1 Removing the handle and safety hood .....................................................................................13
8.2 Disassembling the housing.......................................................................................................14
8.2.1 Removing the handle ........................................................................................................14
8.2.2 Removing the network cable.............................................................................................15
8.2.3 Disassembling the switch WSG 20/25...............................................................................16
8.2.4 Disassembling the switch WSB 20/25 ...............................................................................18
8.2.5 Removing the carbon brushes...........................................................................................19
8.2.6 Removing the electronics WSG 20/25...............................................................................20
8.2.7 Removing the electronics WSB 20/25 ...............................................................................21
8.3 Disassembling the gearbox housing WSG 20/25-180/230........................................................22
8.3.1 Removing the threaded flange ..........................................................................................22
8.3.2 Removing the bearing plate...............................................................................................23
8.3.3 Disassembling the bearing plate........................................................................................24
8.3.4 Removing the gearbox housing.........................................................................................26
8.3.5 Removing the armature.....................................................................................................28
8.3.6 Removing the housing components ..................................................................................29
8.4 Disassembling the gearbox housing WSB 20/25-180/230........................................................31
8.4.1 Remove the clamping unit.................................................................................................31
8.4.2 Removing the bearing plate...............................................................................................32
8.4.3 Disassembling the bearing plate........................................................................................33
8.4.4 Disassembling the shaft ....................................................................................................35
8.4.5 Removing the gearbox housing.........................................................................................36

Grinding
34130529060
Printed in Germany
Contents
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FEIN retains all rights of disposal, such as copying and circulation.
8.4.6 Removing the armature.....................................................................................................38
8.4.7 Removing the housing components ..................................................................................39
8.5 Removing the motor.................................................................................................................40
8.5.1 Disassembling the armature..............................................................................................40
8.5.2 Removing the stator..........................................................................................................41
9Assembly.........................................................................................................................................43
9.1 Fitting the motor .......................................................................................................................43
9.1.1 Fitting the stator ................................................................................................................43
9.1.2 Assembling the armature...................................................................................................45
9.2 Assembling the gearbox housing WSG 20/25-180/230 ............................................................46
9.2.1 Positioning the housing components.................................................................................46
9.2.2 Positioning the armature ...................................................................................................47
9.2.3 Positioning the gearbox housing........................................................................................48
9.2.4 Assembling the bearing plate............................................................................................50
9.2.5 Positioning the bearing plate.............................................................................................52
9.2.6 Positioning the threaded flange.........................................................................................53
9.3 Assembling the gearbox housing WSB 20/25-180/230.............................................................54
9.3.1 Positioning the housing components.................................................................................54
9.3.2 Positioning the armature ...................................................................................................55
9.3.3 Positioning the gearbox housing........................................................................................56
9.3.4 Assembling the shaft.........................................................................................................58
9.3.5 Assembling the bearing plate............................................................................................59
9.3.6 Positioning the bearing plate.............................................................................................61
9.3.7 Positioning the clamping unit.............................................................................................62
9.4 Assembling the housing ...........................................................................................................63
9.4.1 Positioning the carbon brushes.........................................................................................63
9.4.2 Positioning the electronics WSG 20/25..............................................................................64
9.4.3 Positioning the electronics WSB 20/25..............................................................................65
9.4.4 Positioning the network cables..........................................................................................66
9.4.5 Assembling the switch WSG 20/25....................................................................................67
9.4.6 Assembling the switch WSB 20/25....................................................................................69
9.4.7 Fitting the handle...............................................................................................................70
9.5 Assembling the handle and safety hood...................................................................................72
10 Inspection following repairs .............................................................................................................73

Grinding
34130529060
Printed in Germany
Models described
C-SC_CSSM
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10.03.2021
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FEIN retains all rights of disposal, such as copying and circulation.
1 Models described
These repair instructions describe how to repair the following models:
Model
Material number
WSG 20-180
7 221 07 .. .. .
WSG 20-230
7 221 08 .. .. .
WSG 25-180
7 221 26 .. .. .
WSG 25-230
7 221 27 .. .. .
WSB 20-180
7 221 05 .. .. .
WSB 20-230
7 221 06 .. .. .
WSB 25-180 X
7 221 10 .. .. .
WSB 25-230 X
7 221 11 .. .. .

Grinding
34130529060
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Technical data
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2 Technical data
Technical data
The complete technical data can be found in the operating instructions for the model.
Special tools
The special tools catalogue can be found in the FEIN electronic information system.
Lubricants and auxiliary substances
The lubricants catalogue can be found in the FEIN electronic information system.
Lists of spare parts
Lists of spare parts and exploded views are available online in our spare parts catalogue, which can be
accessed via the FEIN website.
Connection diagram
The connection diagram can be found in the FEIN electronic information system.
Documents required for further repair work
- FEIN lubricants catalogue
- FEIN special tools catalogue
- All relevant service communications

Grinding
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Symbols used
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3 Symbols used
Refers to measures for avoiding the risk of injuries.
Refers to information or instructions that should be followed. Non-observance can result in
damage or malfunctions.
Read the operating instructions.
Indicates notes that provide information or instructions that may provide a better understanding
and contribute to the more effective use of the product.
Part of the navigation interface.

Grinding
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Notes and requirements
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4 Notes and requirements
Please note
These instructions are only intended for persons with suitable technical training. It is assumed that the
reader has mechanical and electrical training.
Only use original FEIN spare parts!
Provisions
Please note that power tools may only be repaired, maintained and checked by a trained electrician, as
improper repair can result in serious risks to the user.
Outside Germany, the regulations applicable in the relevant country must be observed.
The provisions set out in DIN VDE 0701-0702 should be observed after repairs.
The relevant accident prevention regulations are to be observed during commissioning.
The German Equipment and Product Safety Act [ProdSG] applies for correct use.
Disclaimer
The content of this documentation has been carefully reviewed and produced to the best of our knowledge.
C. & E. Fein GmbH assumes no responsibility for the completeness, relevance, quality or correctness of the
information provided.
Liability claims against C. & E. Fein GmbH that relate to material or immaterial damage caused by the use
or failure to use the information provided or by the use of incorrect or incomplete information are excluded.
Claims relating to acts committed intentionally or through gross negligence are categorically excluded.
INFORMATION
Read the operating instructions for the product before
carrying out any repair work.

Grinding
34130529060
Printed in Germany
Safety instructions
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FEIN retains all rights of disposal, such as copying and circulation.
5 Safety instructions
5.1 Structure
5.2 Danger classification
Warning
This warning refers to a dangerous situation. If the situation is not avoided, this may result in severe injuries
or death.
Caution
This warning refers to a potentially dangerous situation. If the situation is not avoided, this may result in
slight or minor injuries. This may also be used as a warning against material damage.
Please note
Indicates a potentially harmful situation. If this situation is not avoided, the product or an object in its
environment could be damaged.
SIGNAL WORD FOR THE DANGER
CLASSIFICATION.
Type and source of the danger.
Possible consequences.
Measure that must be taken in order to avoid this danger.
WARNING!
Type and source of the danger.
Possible consequences.
Measure that must be taken in order to avoid this danger.
CAUTION!
Type and source of the danger.
Possible consequences.
Measure that must be taken in order to avoid this danger.
PLEASE NOTE:
Type and source of the danger.
Damage to the product or its environment.
Measure that must be taken in order to avoid this danger.

Grinding
34130529060
Printed in Germany
Safety instructions
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FEIN retains all rights of disposal, such as copying and circulation.
5.3 Information
Indicates notes that provide information or instructions that may provide a better understanding and
contribute to the more effective use of the product.
INFORMATION
Tip

Grinding
34130529060
Printed in Germany
Tools, lubricants and auxiliary substances required
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FEIN retains all rights of disposal, such as copying and circulation.
6 Tools, lubricants and auxiliary substances required
6.1 Standard tools
Torx
T20; T25
Cross-head screwdriver
PH2
Slotted screwdriver
Arbor press
Punch
2 mm; 6 mm; 8 mm; 10 mm
Plastic hammer
Circlip pliers
Pin-type face wrench
62910022002
35 mm
Sleeve
18 mm outer diameter
Sleeve
22 mm outer diameter
Sleeve
29 mm outer diameter
Sleeve
34 mm outer diameter
Sleeve
39 mm outer diameter
Sleeve
54 mm outer diameter
Sleeve
10 mm inner diameter
Sleeve
13 mm inner diameter
Sleeve
18 mm inner diameter
Sleeve
31 mm inner diameter
Sleeve
65 mm inner diameter
6.2 Special tools
Assembly aid
64122121010
Drawing-off plate
64102070009
Sleeve
120 mm inner diameter
130 mm outer diameter
64101002004
Drawing-off socket cap
64104150008
Chuck cone
32 mm
64107032000
Chuck cone
26 mm
64107026000

Grinding
34130529060
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Tools, lubricants and auxiliary substances required
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6.3 Lubricants and auxiliary substances required
The manufacturer's specifications for the lubricants used can be found in the FEIN lubricants catalogue.
Grease
SM 0001
85 g
Gearbox
Sealant
Loctite 573
n.a.
Gearbox housing

Grinding
34130529060
Printed in Germany
Test and diagnostics options
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7 Test and diagnostics options
Test data
The permitted parameters for the machine can be found in the FEIN electronic information system.

Grinding
34130529060
Printed in Germany
Disassembly
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8 Disassembly
8.1 Removing the handle and safety hood
Tools:
- None
1. Unscrew the handle (1).
2. Remove the safety hood (2).
1
2

Grinding
34130529060
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Disassembly
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8.2 Disassembling the housing
8.2.1 Removing the handle
Tools:
- PH2 cross-head screwdriver
1. Unscrew the four screws (1).
2. Remove the handle half shell (2).
3. Remove the switch (3).
4. Remove the handle half shell (4).
INFORMATION
Press the switch pushbutton (5) at the same time.
5. Remove the switch pushbutton (5).
6. Remove the spring (6).
INFORMATION
Secure the spring (6).
1
2
6
3
4
5
5

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Disassembly
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8.2.2 Removing the network cable
Steps that must be completed:
- Remove handle
Tools:
- PH2 cross-head screwdriver
1. Unscrew the screw (1).
2. Remove the cable clamp (2).
3. Unscrew the two screws (3).
4. Remove the cable (4).
5. Remove the cable grommet (5).
1
5
2
4
3

Grinding
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Disassembly
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FEIN retains all rights of disposal, such as copying and circulation.
8.2.3 Disassembling the switch WSG 20/25
Steps that must be completed:
- Removing the handle
- Removing the network cable
Tools:
- Assembly aid
- PH2 cross-head screwdriver
1. Remove the plug (1).
2. Remove the plug (2).
3. Remove the plug (3).
3
2
1

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Disassembly
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4. Unscrew the screw (1).
5. Remove the connecting piece (2).
INFORMATION
Only remove the connecting piece (2), if necessary.
1
2

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Disassembly
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8.2.4 Disassembling the switch WSB 20/25
Steps that must be completed:
- Removing the handle
- Removing the network cable
Tools:
- Assembly aid
- PH2 cross-head screwdriver
1. Remove the plug (1).
2. Remove the plug (2).
3. Remove the plug (3).
4. Unscrew the screw (4).
5. Remove the cable (5).
6. Unscrew the screw (6).
7. Remove the connecting piece (7).
INFORMATION
Only remove the connecting piece (7), if necessary.
4
2
1
3
5
6
7

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Disassembly
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8.2.5 Removing the carbon brushes
Tools:
- PH2 cross-head screwdriver
- Assembly aid
1. Unscrew the screw (1).
2. Remove the cover (2).
3. Remove the plug (4).
4. Lift up the spring (5).
5. Remove the carbon brush (6).
6. Unscrew the screw (7).
7. Remove the carbon brush holder (8).
8. Remove the cable (3).
9. Repeat steps 1 to 8 on the opposite side of the machine.
4
1
2
5
6
7
8
3

Grinding
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Disassembly
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FEIN retains all rights of disposal, such as copying and circulation.
8.2.6 Removing the electronics WSG 20/25
Steps that must be completed:
- Remove handle
- Removing the switch
Tools:
- PH2 cross-head screwdriver
1. Remove the plug (1).
2. Unscrew the four screws (2).
3. Remove the housing (3).
4. Remove the electronics (4).
5. Remove the pressure piece (5).
4
5
3
1
2