Stihl BT 131 Service Manual
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Stihl BT 131 Service Manual

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STIHL BT 131
Service Manual
2016-10

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Summary of Contents for Stihl BT 131

  • Page 1 STIHL BT 131 Service Manual 2016-10...

  • Page 3: Table Of Contents

    Mounting Clutch Housing on Gearbox.... 12 Removing the Handle Frame......12 Fitting the Handle Frame ........ 12 This service manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process with electronic systems. BT 131...

  • Page 4: Safe Diagnosis And Repairs

    Spare Parts Safe diagnosis and repairs If spare parts not approved by STIHL are installed, they Guide to Using this Service Manual may not fulfill the required function or deactivate safety devices. This can result in serious or fatal injuries.

  • Page 5: Troubleshooting

    Check pinion shaft, output shaft and gears clutch housing for damage, replace if necessary, then pack gearbox and clutch housings with STIHL gear grease Gearbox runs erratically and stops Clutch worn Inspect clutch and clutch drum, replace if under load...

  • Page 6: Handlebars, Control Handle, Assist Handle

    – Disassemble and assemble the control handle (2), see Knife – ‘Series 4180 Powerhead’ service manual. STIHL OH 723 press fluid – 0781 957 9000 – Removing the Assist Handle Standard commercial solvent-based degreasant – containing no chlorinated or halogenated...

  • Page 7: Fitting The Assist Handle

    Insert the screws (8) from outside. Hold the screws (8) steady and fit and tighten down the nuts (7). Lay throttle cable (13) along the handle frame and secure it with cable ties (12) – ends facing down. BT 131...

  • Page 8: Antivibration System

    – Screwdriver, T27x200 – 5910 890 2415 – Socket, 8 mm – STIHL OH 723 press fluid – 0781 957 9000 – Removing the Antivibration Elements Preparations, @ 3.1. Coat stops (4) and rubber buffers (3) with press fluid Remove the handlebar, @ 5.2.
  • Page 9 Assemble the AV housing (2). Fit the AV housing (2) with tube (8) on the frame. Insert the screws (1) from outside. Hold the screws (1) steady and fit and tighten down the nuts (5). Install the handlebars, @ 5.7. BT 131...

  • Page 10: Powerhead

    Lift the powerhead (5) off the clutch housing (4). Removing and Installing the Clutch See ‘Series 4180 Powerhead’ service manual. Disassembling and Assembling the Powerhead Refer to ‘Series 4180 Powerhead’ service manual for diagnosis and repair procedures on powerhead. BT 131...

  • Page 11: Fan Housing, Air Guide Shroud

    Install the powerhead, @ 7.2. Install handlebar together with control handle, @ 5.7. Removing the Fan Housing Preparations, @ 3.1. Remove handlebar together with control handle, @ 5.2. Remove the powerhead, @ 7.2. Take out the screws (4). BT 131...

  • Page 12: Installing The Fan Housing

    Installing the Air Guide Shroud Fit bushing (7) in the air guide shroud (6). Fit retaining lugs of air guide shroud (6) in the cooling slots of the shroud (9) and screen (8). Insert and tighten down the screw (5). BT 131...

  • Page 13: Clutch Housing With Gearbox, Handle Frame

    – Torque wrench – 5910 890 0302 – Screwdriver, T27x200 – 5910 890 2415 – STIHL gear grease – 0781 120 1118 – Dirko HT red sealant – 0783 830 2000 – Removing Clutch Housing with Gearbox Preparations, @ 3.1.

  • Page 14: Mounting Clutch Housing On Gearbox

    Open the AV housing and remove it together with tubes, @ 6.2. Remove the powerhead, @ 7.2. Remove clutch housing together with gearbox, @ 9.2. Fitting the Handle Frame Install clutch housing together with gearbox, @ 9.3. Install the powerhead, @ 7.2. BT 131...
  • Page 15 Install the antivibration elements, @ 6.3. Install the handlebars, @ 5.6. BT 131...

  • Page 16: 10 Clutch Drum

    (1). 10.2 Inspecting Clutch Drum Preparations, @ 3.1. Remove handlebar together with control handle, @ 5.2. Remove the powerhead, @ 7.2. Remove clutch housing together with gearbox, @ 9.2. Remove clutch housing from the gearbox, @ 9.4. BT 131...

  • Page 17: Installing The Clutch Drum

    (1). Fit clutch housing on the gearbox, @ 9.5. Install the clutch housing with gearbox, @ 9.3. Install the powerhead, @ 7.2. Install handlebar together with control handle, @ 5.7. BT 131...

  • Page 18: 11 Auger Brake

    – Remove the powerhead, @ 7.2. Pin punch, 3 mm (1/8 in) – Remove clutch housing together with gearbox, @ STIHL multipurpose grease – 0781 120 1110 – 9.2. STIHL gear grease – 0781 120 1118 – Remove clutch housing from the gearbox, @ 9.4.

  • Page 19: Checking Brake Band For Wear

    Unscrew the bearing pin (1). Drive pin (8) home until height ‘b’ is Remove the E-clip (10). about 6.0 - 6.2 mm (about 0.24 in). Push out the retainer (2). Install the flat springs, @ 11.10. Pull out the brake lever (9). BT 131...

  • Page 20: Installing The Flat Springs

    Fit the brake band (15) in its guide (20) in the clutch housing (7). Engage the auger brake. Fit the brake band (15) in the clutch housing (7). Fit the insert (14). Insert and tighten down the screw (13). Fit the cover (18). Fit the cover (11). BT 131...
  • Page 21 Insert and tighten down the screw (12). Install the clutch drum, @ 10.4. Fit clutch housing on the gearbox, @ 9.5. Install clutch housing together with gearbox, @ 9.3. Install the powerhead, @ 7.2. Install handlebar together with control handle, @ 5.7. BT 131...

  • Page 22: 12 Clutch Housing

    120°C (250°F). Use press arbor 1117 893 7200 to remove the ball bearings (3 and 4). Heat the clutch housing (1) in area of ball bearing (2) to about 120°C (250°F). Carefully knock out the ball bearing (2). BT 131...

  • Page 23: 13 Gearbox

    Hot air blower – Pin punch, 5 mm (1/4 in) – STIHL multipurpose grease – 0781 120 1110 – Insert 5 mm / 1/4in diameter pin punch (11) through bore (arrow) and tap to release the gearbox housing STIHL gear grease – 0781 120 1118 –...

  • Page 24: Assembling The Gearbox

    Apply Dirko sealant to the gearbox housing (1) sealing face (arrows) and check the following points: Sealant forms a bead a = 1 mm (0.04 in) high. – Sealant does not project into the gearbox housing (1). – BT 131...

  • Page 25: 14 Tools, Servicing Aids

    STIHL gear grease Packing gearbox housing, clutch housing with grease: lubricating brake band 0781 957 9000 STIHL OH 723 press fluid Rubber elements, AV elements, assist handle 0783 830 2000 Dirko HT red sealant Sealing clutch housing and gearbox housing...
  • Page 26 BT 131...
  • Page 28 RA_023_2016_01_01 englisch www.stihl.com...

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