Fein WSG8-115 Setup guide

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
Repair instructions
C-SC_CSSM
Version 1.0
2014-12-18
All rights reserved by FEIN, especially in case of industrial rights registration.
FEIN retains all rights of disposal, such as copying and circulation.
Page 1of 47

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
Contents
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Version 1.0
2014-12-18
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FEIN retains all rights of disposal, such as copying and circulation.
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1. Models described
2. Technical data
3. Notes and requirements
4. Tools required
5. Lubricants and auxiliary substances required
6. Disassembly
7. Assembly
8. Connection diagram

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
1. Models described
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These instructions describe how to repair the following models:
Model Order number
WSG 8-115 7 221 73 00 23 0
WSG 8-125 7 221 74 00 23 0
WSG 12-125P 7 221 75 00 23 0
WSG 11-125 7 221 77 00 23 0
WSG 15-125P 7 221 78 00 23 0
WSG 15-125PS 7 221 80 00 23 0
WSG 15-150P 7 221 82 00 23 0
WSG 15-70Inox 7 221 84 00 23 0

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
2. Technical data
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Technical data
The complete technical data can be found in the operating instructions for the model.
Test data
Up-to-date test data for all models can be found on the FEIN Extranet (Customer Service → Repair Guides).
Lubricants
The lubricants and container sizes available from FEIN can be found on the FEIN Extranet (Customer Service → Repair Guides).
Lists of spare parts
Lists of spare parts and exploded views are available online at www.fein.com

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
3. Notes and requirements
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2014-12-18
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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.
The provisions set out in DIN VDE 0701-0702 should be observed after repairs.
The relevant accident prevention regulations of the employers’ liability insurance associations are to be observed when
commissioning.
The German Equipment and Product Safety Act applies for correct use.
Outside Germany, the provisions applicable in the relevant country must be observed!

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
4. Tools required
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Standard tools Special tools
Plastic hammer Drawing-off socket cap 6 41 04 150 00 8
Slotted screwdriver (small) Chuck cone, 19 mm 6 41 07 019 00 7
Torx screwdriver T15; T20 Chuck cone, 26 mm 6 41 07 026 00 0
Punch Drawing-off plate 6 41 02 069 00 7
Arbor press Pipe 6 41 01 002 00 4
Ball bearing support 19 mm; 26 mm Assembly aid 6 41 22 121 01 0
Sleeves •35 mm inner diameter
•14 mm inner diameter
19 mm outer diameter
•30 mm inner diameter
42 mm outer diameter
•15 mm inner diameter
20 mm outer diameter
•15 mm inner diameter
27 mm outer diameter
Pressure piece 6 41 22 003 00 0
4x round material Diameter 20 mm;
length = 60 mm

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
5. Lubricants and auxiliary substances required
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FEIN retains all rights of disposal, such as copying and circulation.
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Lubricants
WSG 8-115; WSG 8-125; WSG 12-125P;
WSG 11-125; WSG 15-125P
Grease 0 40 101 01 00 4 21 g Gearbox
WSG 15-125PS; WSG 15-150P;
WSG 15-70Inox
Grease 0 40 101 01 00 4 29 g Gearbox
Auxiliary substances
Loctite 573 Compensating disc

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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Disassembling housing cover
1. Unscrew two screws (1) and take off bottom part of cover (2).
Tools:
- Torx T15
1
2

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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2014-12-18
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FEIN retains all rights of disposal, such as copying and circulation.
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Speedy mains cable replacement
1. Unscrew screw (1) and remove cable clamp (2).
2. Pull off cover (3).
3. Slide hook (4) into opening (5).
4. Turn hook and take out cable (6).
5. Turn hook and take out cable (7).
6. Remove cable (8) with plug
Tools:
- Torx T15
- Assembly aid
3
4
6
7
1
2
8
5

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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Disassembling switch (applies to: WSG 8; WSG 11)
1. Unscrew screw (1) and remove cable clamping piece (2).
2. Unscrew two screws (3) and take off upper part of cover (4).
3. Slide switch (5) out of holder.
Tools:
- Torx T15
5
4
2
3
1
5
230V variant
120V variant
5
110V variant

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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Disassembling switch (applies to: WSG 8-115; WSG 11)
1. Open rubber cover (1).
2. Open spring clips by turning with a small slotted screwdriver.
3. Remove the four stranded wires (2).
Tools:
- Slotted screwdriver
(small)
1
2

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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FEIN retains all rights of disposal, such as copying and circulation.
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Disassembling switch (applies to: WSG 12; WSG 15)
1. Unscrew screw (1) and remove cable clamping piece (2).
2. Unscrew two screws (3) and take off upper part of cover (4).
3. Slide switch (5) out of holder.
Tools:
- Torx T15
5
4
2
3
1
5
230V variant
120V variant
110V variant
5

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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Disassembling switch (applies to: WSG 12; WSG 15)
1. Lift hook (1) on both sides of switch and pull off electronics (2).
2. Open rubber cover (3).
3. Open spring clips by turning with a small slotted screwdriver.
4. Remove the four stranded wires (4).
Tools:
- Slotted screwdriver
(small)
2
4
3
1

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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FEIN retains all rights of disposal, such as copying and circulation.
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Disassembling stator
1. Pry tension spring (1) off carbon brush (2).
2. Pull out carbon brush (2).
3. Unscrew the four screws (3).
4. Pull gearbox housing (4) with armature out of housing.
Tools:
- Assembly aid
- Torx T15
3
1
2
4

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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FEIN retains all rights of disposal, such as copying and circulation.
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Disassembling stator
1. Remove air guide ring (1).
2. Lift up slide switch (2) and remove.
3. Remove two carbon bushes holders (3).
4. Pull out control rod (4).
1
2
3
4

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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Disassembling stator
1. Remove stator (1). Tools:
- Plastic hammer
1

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
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FEIN retains all rights of disposal, such as copying and circulation.
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Disassembling armature
1. Use a plastic hammer to remove armature (1).
2. Remove bearing bush (2).
3. Remove bevel pinion (3).
Tools:
- Plastic hammer
- Punch
- Arbor press
- Drawing-off plate
6 41 02 069 00 7
- Pipe
6 41 01 002 00 4
3
2
3
1

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
C-SC_CSSM
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2014-12-18
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FEIN retains all rights of disposal, such as copying and circulation.
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Disassembling armature
1. Remove grooved ball bearing (1).
2. Remove plate (2).
3. Remove grooved ball bearing (3).
4. Pull off magnet (4).
The plastic sleeve is included in the following tool types:
WSG 12; WSG 15
The magnet is destroyed during disassembly and has to be replaced.
Tools:
- Drawing-off socket cap
6 41 04 150 00 8
- Chuck cone, 26 mm
6 41 07 026 00 0
- Chuck cone, 19 mm
6 41 07 019 00 7
3
1
2
4

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
C-SC_CSSM
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2014-12-18
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FEIN retains all rights of disposal, such as copying and circulation.
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Disassembling gearbox housing
1. Remove air guide ring (1).
2. Unscrew the four screws (2) and remove spring.
3. Remove spring (3).
4. Take off bearing plate (4).
5. Remove compensating disc(s) (5).
Tools:
- Torx T20
1
5
2
4
3

WSG 8-115; 8-125; 12-125P; WSG 11-125; WSG 15-125P; WSG 15-125PS; WSG 15-150P; WSG 15-
70Inox
6. Disassembly
C-SC_CSSM
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2014-12-18
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FEIN retains all rights of disposal, such as copying and circulation.
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Disassembling gearbox housing
1. Unscrew two screws (1).
2. Remove lever (2).
3. Remove spiral spring (3).
Tools:
- Torx T20
2
1
3