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Stihl Chainsaw MS 240, MS 260, MS 260 C and Parts Workshop Service Repair Manual

Stihl Chainsaw MS 240, MS 260, MS 260 C and Parts Workshop Service Repair Manual

Stihl MS 240 MS 260 MS 250 MS 250 C Brushcutters Chainsaw & Parts Workshop Service Repair Manual

This Stihl MS 240 MS 260 MS 250 MS 250 C service manual contains detailed descriptions of all the repair and servicing procedures specific to this power tool. You should make use of the illustrated parts lists while carrying out repair work. They show the installed positions of the individual components and assemblies. Refer to the latest edition of the relevant parts list to check the part numbers of any replacement parts. A fault on the machine may have several causes. To help locate the fault, consult the troubleshooting charts for all assemblies and systems in this manual and the “STIHL Service Training System”. Refer to the “Technical Information” bulletins for engineering changes which have been introduced since publication of this service manual. Technical information bulletins also supplement the parts list until a revised edition is issued. The special tools mentioned in the descriptions are listed in the chapter on “Special Servicing Tools” in this manual. Use the part numbers to identify the tools in the “STIHL Special Tools” manual. The manual lists all special servicing tools currently available from STIHL.

MS240-MS260 Service Manual

This Service Repair Manual Covers: 
1. Introduction G3.171817
2. Safety Precautions G3.171952
3. Specifications G4.848424
3.1 Engine G4.848429
3.2 Fuel System G4.848058
3.3 Ignition System G4.848142
3.4 Chain Lubrication G4.848226
3.5 Tightening Torquese G5.974853
4. Troubleshooting G6.365460
4.1 Clutch G6.365465
4.2 Chain Drive, Chain Brake, Chain Tensioner G7.228685
4.3 Chain Lubrication G8.259505
4.4 Rewind Starter G9.315192
4.5 Ignition System G10.27914
4.6 Carburetor G11.849555
4.7 Engine G12.78491
5. Cutting Attachment G13.891557
5.1 Chain Catcher G13.891660
6. Clutch G13.891695
6.1 Clutch Drum G13.891912
7. Chain Brake G13.892001
7.1 Checking Operation G13.892005
7.2 Removing and Installing the Brake Band G13.892047
7.3 Brake Lever G13.892280
7.4 Cam Lever G13.892501
7.5 Pins G13.892635
7.6 Side Chain Tensioner G13.892741
7.6.1 Front Chain Tensioner G13.892829
7.6.2 Quick Chain Tensioner G13.892905
7.7 Bar Mounting Studs G13.892923
8. Engine G13.893039
8.1 Muffler / Spark Arresting Screen G13.893047
8.2 Leakage Test G13.893239
8.2.1 Preparations G13.893271
8.2.2 Vacuum Test G13.893406
8.2.3 Pressure Test G13.893472
8.3 Oil Seals G13.893566
8.4 Removing and Installing the Shroud G13.893827
8.5 Cylinder G13.893953
8.6 Crankshaft G13.894323
8.6.1 Removing and Installing G13.894327
8.6.2 Bearings / Crankcase G13.894918
8.7 Piston G13.895162
8.7.1 Removal G13.895166
8.7.2 Installing G13.895248
8.8 Piston Rings G13.895415
8.9 Decompression Valve G13.895480
9. Ignition System G13.895538
9.1 Ignition Timing G13.895573
9.2 Ignition Module G13.895585
9.2.1 Removing and Installing G13.895618
9.3 Testing the Ignition Module G13.895919
9.4 Spark Plug Boot / Ignition Lead G13.896054
9.5 Flywheel G13.896182
9.6 Short Circuit Wire G13.896310
9.6.1 Testing G13.896314
9.6.2 Removing and Installing G13.896381
9.6.3 Ground Wire G13.896740
9.7 Ignition System Troubleshooting G14.225909
10. Rewind Starter G15.58482
10.1 General G15.58486
10.2 Removing and Installing G15.58518
10.3 Pawl G15.58562
10.4 Rope Rotor G15.58626
10.5 Starter Rope / Grip G15.58765
10.6 Tensioning the Rewind Spring G15.58988
10.7 Replacing the Rewind Spring G15.59086
11. Servicing the AV System G15.59233
11.1 Annular Buffer on Chain Catcher G15.59249
11.2 Annular Buffer at Clutch Side G15.59357
11.3 Annular Buffer at Ignition Side G15.59456
11.4 Stop Buffer G15.59556
11.5 Handlebar G15.59644
11.6 Handlebar with Handle Heating G15.59735
12. Control Levers G15.60050
12.1 Switch Shaft G15.60054
12.1.1 Removing and Installing G15.60093
12.2 Throttle Trigger/Interlock Lever G15.60241
13. Chain Lubrication G15.60467
13.1 Pickup Body G15.60473
13.2 Oil Suction Hose G15.60522
13.3 Oil Delivery Hose G15.60655
13.4 Non-Adjustable Oil Pump G15.60725
13.5 Adjustable Oil Pump G15.60767
13.6 Valve G15.60963
14. Fuel System G15.61052
14.1 Air Filter G15.61060
14.2 Removing and Installing the Carburetor G15.61110
14.3 Leakage Test G15.61315
14.4 Servicing the Carburetor G15.61430
14.4.1 Inlet Needle G15.61582
14.4.2 Fixed Jet G15.61682
14.4.3 Pump Diaphragm G15.61723
14.4.4 Choke Shaft / Choke Shutter G15.61850
14.4.5 Adjusting Screws G15.61860
14.5 Adjusting the Carburetor G15.62041
14.5.1 Basic Setting G15.62045
14.5.2 Standard Setting G15.62163
14.6 Throttle Rod G15.62332
14.6.1 Removing and Installing the Intake Manifold G15.62379
14.6.2 Impulse Hose G15.62562
14.7 Tank Vent G15.62657
14.7.1 Testing G15.62659
14.7.2 Removing and Installing G15.62761
14.8 Fuel Intake G15.62808
14.8.1 Pickup Body G15.62812
14.8.2 Fuel Suction Hose G15.62881
14.8.3 Removing and Installing the Tank Housing G15.62976
15. Heating System G15.63118
15.1 Carburetor Heating G15.63124
15.1.1 Testing the Complete System G15.63146
15.1.2 Testing the Heating Element G15.63203
15.1.3 Thermostatic Switch G15.63338
15.2 Carburetor Heating System Troubleshooting Chart G16.607531
15.3 Handle Heating System G17.303820
15.3.1 Troubleshooting G17.303824
15.4 Removing and Installing the Heater Switch G17.303964
15.4.1 Heater Switch Ground Wire G17.304091
15.5 Removing and Installing Heating Element in Rear Handle G17.304204
15.6 Removing and Installing the Heating Element in the Handlebar G17.304356
15.7 Removing and Installing the Generator G17.304425
15.7.1 Handle Heating and Generator Troubleshooting Chart G18.791211
15.7.2 Test Connections and Test Values G19.579447
15.8 Wiring Harness G20.667819
16. Special Servicing Tools G21.546233
17. Servicing Aids G22.50329

MS240 – 1121 123
MS250 – 1123 153
MS250C – 1123 205
MS260 – 1121 249


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