Stihl BT 131, Service Manual

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This service manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process with electronic
systems.
Contents
1 Safe diagnosis and repairs ............................ 2
2 Safety During Repair Work ............................ 2
2.1 Protective Gloves............................................ 2
2.2 Safety Glasses................................................ 2
2.3 Spare Parts..................................................... 2
3 Preparations for Repair.................................. 2
3.1 Preparing the Machine.................................... 2
4 Troubleshooting ............................................. 3
4.1 Clutch.............................................................. 3
4.2 Auger Brake.................................................... 3
4.3 Gearbox .......................................................... 3
5 Handlebars, Control Handle, Assist Handle... 4
5.1 Tools, Servicing Aids ...................................... 4
5.2 Removing the Handlebars .............................. 4
5.3 Removing the Control Handle......................... 4
5.4 Removing the Assist Handle........................... 4
5.5 Fitting the Assist Handle ................................. 5
5.6 Fitting the Control Handle ............................... 5
5.7 Fitting the Handlebars..................................... 5
6 Antivibration System ...................................... 6
6.1 Tools, Servicing Aids ...................................... 6
6.2 Removing the Antivibration Elements............. 6
6.3 Installing the Antivibration Elements............... 6
7 Powerhead..................................................... 8
7.1 Special Servicing Tools, Servicing Aids.......... 8
7.2 Removing the Powerhead .............................. 8
7.3 Removing and Installing the Clutch ................ 8
7.4 Disassembling and Assembling the
Powerhead...................................................... 8
7.5 Installing the Powerhead ................................ 8
8 Fan Housing, Air Guide Shroud ..................... 9
8.1 Tools, Servicing Aids ...................................... 9
8.2 Removing the Collar Screws .......................... 9
8.3 Installing the Collar Screws ............................ 9
8.4 Removing the Fan Housing ............................ 9
8.5 Installing the Fan Housing .............................. 10
8.6 Removing the Air Guide Shroud ..................... 10
8.7 Installing the Air Guide Shroud....................... 10
9 Clutch Housing with Gearbox, Handle Frame 11
9.1 Tools, Servicing Aids ...................................... 11
9.2 Removing Clutch Housing with Gearbox ........ 11
9.3 Installing Clutch Housing with Gearbox .......... 11
9.4 Removing the Clutch Housing from the
Gearbox .......................................................... 11
9.5 Mounting Clutch Housing on Gearbox............ 12
9.6 Removing the Handle Frame.......................... 12
9.7 Fitting the Handle Frame ................................ 12
10 Clutch Drum ................................................... 14
10.1 Tools, Servicing Aids ...................................... 14
10.2 Inspecting Clutch Drum .................................. 14
10.3 Removing the Clutch Drum............................. 14
10.4 Installing the Clutch Drum............................... 15
11
Auger Brake ................................................... 16
11.1 Tools, Servicing Aids ...................................... 16
11.2 Testing Auger Brake....................................... 16
11.3 Removing the Brake Band.............................. 16
11.4 Checking Brake Band for Wear ...................... 17
11.5 Removing the Brake Lever ............................. 17
11.6 Removing the Flat Springs ............................. 17
11.7 Removing the Pins ......................................... 17
11.8 Installing the Pins ........................................... 17
11.9 Installing the Flat Springs ............................... 18
11.10 Installing the Brake Lever ............................... 18
11.11 Installing the Brake Band................................ 18
12
Clutch Housing............................................... 20
12.1 Tools, Servicing Aids ...................................... 20
12.2 Disassembling the Clutch Housing................. 20
12.3 Installing the Clutch Drum............................... 20
13
Gearbox ......................................................... 21
13.1 Special Servicing Tools, Servicing Aids.......... 21
13.2 Disassembling the Gearbox............................ 21
13.3 Assembling the Gearbox ................................ 22
14
Tools, Servicing Aids...................................... 23
14.1 Tools, Servicing Aids ...................................... 23