8
MS 460, MS 460 C
4.
Troubleshooting Chart
4.1
Clutch, Chain Drive, Chain Brake,
Chain Tensioner
Condition
Cause
Remedy
Saw chain stops under load at full
throttle
Clutch shoes badly worn
Replace clutch shoes
Clutch drum badly worn
Install new clutch drum
Brake band stuck
Check freedom of movement
and function of brake band
Saw chain rotates at idle speed
Engine idle speed too high
Readjust with idle speed screw
(counterclockwise)
Clutch springs stretched or fatigued Replace the clutch springs
Clutch spring hooks broken
Replace the clutch springs
Loud noises
Clutch springs stretched or fatigued Replace all clutch springs
Needle cage damaged
Fit new needle cage
Clutch shoe retainer broken
Fit new retainer
Clutch shoes and carrier worn
Install new clutch
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
Install new chain sprocket
Chain does not stop immediately
when brake is activated
Brake spring stretched or broken
Fit new brake spring
Brake band stretched / worn /
broken
Fit new brake band