Stihl MS 311 Service Manual
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Stihl MS 311 Service Manual

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STIH)
STIHL MS 311, 391
2009-06

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Summary of Contents for Stihl MS 311

  • Page 1 STIH) STIHL MS 311, 391 2009-06...

  • Page 2: Table Of Contents

    General Cam Lever Fan housing Pins 8.2.1 Segment Chain Tensioner Pawls Bar Mounting Studs Rope Rotor Starter Rope / Grip Tensioning the Rewind Spring Replacing the Rewind Spring © ANDREAS STIHL AG & Co. KG, 2009 MS 311, MS 391...
  • Page 3 12.8 Carburetor Carrier 12.9 Intake Manifold 12.10 Tank Vent 12.10.1 Testing 12.10.2 Removing and Installing 12.11 Fuel Intake 12.11.1 Pickup Body 12.11.2 Fuel Hose 12.11.3 Fuel Suction Hose 12.11.4 Tank Housing Special Servicing Tools Servicing Aids MS 311, MS 391...

  • Page 4: Introduction And

    Use the part numbers to detailed descriptions of all the repair identify the tools in the and servicing procedures specific to "STIHL Special Tools" manual. The this power tool. manual lists all special servicing tools currently available from You should make use of the STIHL.
  • Page 5 Spilled replacement parts. Do not re-use fuel hoses after fuel must be wiped away They can be identified by the STIHL removal. Always install new hoses immediately. part number, the { logo – fuel hoses can be overstretched and the STIHL parts symbol K during removal.

  • Page 6: Clutch

    Speed-controlled oil pump with reciprocating piston and manual flow control Oil delivery rate: 11.5 (+2.5) cm /min Ematic oil pump at 10,000 rpm Oil delivery rate: 6.0 (+/-2.0)...17.5 (+3.0 / -4.5) Adjustable oil pump /min at 10,000 rpm MS 311, MS 391...

  • Page 7: Chain Brake

    1) 3) Screw M 8x1 Flywheel/crankshaft 33.0 Carburetor/collar stud Screw P 4x14 Pre-separator / engine housing Screw P 4x12 Cover plate/fan housing Spark plug M 14x1.25 Spark plug 25.0 Screw D 4x18 Ignition module / engine pan MS 311, MS 391...
  • Page 8 Power screwdriver setting for polymer: DG and P screws max. 500 rpm Do not use an impact wrench for releasing or tightening screws. Do not mix up screws with and without binding heads. MS 311, MS 391...
  • Page 9 Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Needle cage damaged Fit new needle cage Clutch shoe retainer broken Install new retainer or clutch Clutch shoes and carrier worn Install new clutch MS 311, MS 391...
  • Page 10 Replace the clutch springs Saw chain does not stop Brake spring stretched or broken Fit new brake spring immediately when brake is activated Brake band stretched or worn Fit new brake band Clutch drum worn Install new clutch drum MS 311, MS 391...
  • Page 11 Install new oil pump Worm drive spring not engaged in Engage drive spring in notch in clutch drum clutch drum Oil pump delivery rate set too low Adjust oil pump (only on version with adjustable oil pump) MS 311, MS 391...
  • Page 12 (spring degreasant (containing no windings stick together) chlorinated or halogenated hydrocarbons), then pull rope carefully several times until normal action is restored Decompression valve is not open Open, check and replace decompression valve if necessary MS 311, MS 391...

  • Page 13: Short Circuit Wire

    Check ignition lead/ignition module and replace ignition module if necessary. Check operation of spark plug. Clean the spark plug or replace if necessary. Engine housing damaged (cracks) Install new engine housing MS 311, MS 391...
  • Page 14 Diaphragm gasket leaking Fit new diaphragm gasket Metering diaphragm damaged or Fit a new metering diaphragm shrunk Tank vent faulty Replace tank vent Leak on fuel hose from tank to Seal connections or install new fuel carburetor hose MS 311, MS 391...
  • Page 15 Saw chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs MS 311, MS 391...
  • Page 16 Erratic idle – too lean Air valve does not close completely Check the end cover with air valve and replace if necessary Intake manifold faulty Install new intake manifold MS 311, MS 391...

  • Page 17: Fan Housing

    Close, check and replace decompression valve if necessary Engine overheating Insufficient cylinder cooling. Air Thoroughly clean all cooling air inlets in fan housing blocked or openings and the cylinder fins cooling fins on cylinder very dirty MS 311, MS 391...
  • Page 18 0000 893 5903 into the spark correct operation of the clutch. plug hole, wide end first, so that "OBEN-TOP" faces up. : Use hook (2) 5910 890 2800 to remove the clutch springs (1). MS 311, MS 391...
  • Page 19 : Position the clutch on the crankshaft stub so that the raised hexagon (arrow) faces outwards. : Check the clutch – all springs (arrows) must be properly attached. : Clamp the clutch in a vise (arrow). MS 311, MS 391...
  • Page 20 If there are signs of serious wear on the inside diameter of the clutch drum (1), check the remaining wall thickness. If it is less than about 80% of the original thickness, install a new clutch drum. – Install the clutch drum. MS 311, MS 391...

  • Page 21: Handlebar

    Do not overstretch the brake band. the eye. – Pull the hand guard towards the If the chain brake does not operate handlebar to simplify assembly of properly, refer to troubleshooting, the brake band. b 3.2. MS 311, MS 391...
  • Page 22 : Push the brake band (1) into its seat (arrow) as far as stop. : Hold the brake band (1) sideways, attach it to the brake lever (2) and then swing it in the direction of its seat. MS 311, MS 391...
  • Page 23 : Pull the hand guard (1) and brake lever (2) off the pivot pins – Remove the sleeve (1). (arrows) together. – Lift the hand guard a little and – Remove the hand guard and remove the fan housing. brake lever. MS 311, MS 391...
  • Page 24 : Turn the cam lever (1) to one side until the cam of the hand guard (arrow) slips passed it. – Push the hand guard bearing boss and the brake lever on to the pivot pins. MS 311, MS 391...
  • Page 25   BUY NOW  Then Instant Download  the Complete Manual  Thank you very much! ...

This manual is also suitable for:

Ms 391Ms 191

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