Stihl MS 440 Service Manual

7MS 440, MS 440 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 Adjust idle speed screw
(counterclockwise)
Clutch springs stretched or fatigued Replace clutch springs
Clutch spring hooks broken Replace 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 Fit new chain sprocket
Saw chain does not stop
immediately when brake is
activated
Brake spring stretched or broken Fit new brake spring
Brake band stretched, worn or
broken
Fit new brake band

Stihl MS 440 Specifications

General

Displacement	70.7 cc
Chain Pitch	3/8"
Ignition system	Electronic
Starter	Recoil starter
Vibration reduction	Anti-vibration system
Weight (without bar and chain)	6.4 kg
Fuel tank volume	0.73 L
Oil Capacity	0.36 L
Guide Bar Length	40-63 cm
Guide Bar Length (recommended)	40-71 cm (16-28 in)