Stihl MS 311 User Manual - Page 10

Chain Drive, Chain Brake, Chain Tensioner

Page 10 highlights

3.2 Chain Drive, Chain Brake, Chain Tensioner Condition Chain sprocket wears rapidly Cause Chain not properly tensioned Wrong chain pitch Insufficient chain lubrication Chain sprocket worn Remedy Tension chain as specified Fit chain of correct pitch Check chain lubrication Fit new chain sprocket Saw chain stops under load at full Clutch shoes badly worn throttle Clutch drum badly worn Brake band blocked Install new clutch Install new clutch drum Check freedom of movement and operation of brake band 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 Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Install new clutch drum MS 311, MS 391 9

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9
MS 311, MS 391
3.2
Chain Drive, Chain Brake, Chain Tensioner
Condition
Cause
Remedy
Chain sprocket wears rapidly
Chain not properly tensioned
Tension chain as specified
Wrong chain pitch
Fit chain of correct pitch
Insufficient chain lubrication
Check chain lubrication
Chain sprocket worn
Fit new chain sprocket
Saw chain stops under load at full
throttle
Clutch shoes badly worn
Install new clutch
Clutch drum badly worn
Install new clutch drum
Brake band blocked
Check freedom of movement and
operation of brake band
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
Saw chain does not stop
immediately when brake is
activated
Brake spring stretched or broken
Fit new brake spring
Brake band stretched or worn
Fit new brake band
Clutch drum worn
Install new clutch drum