STIHL MS 250 manual If necessary1 Chain catcher Check Replace Exhaust bore

									English
The following information applies under normal operating conditions. The specified intervals must be
shortened accordingly when working for longer than normal each day or under difficult conditions		workstartingBefore	and/orworkofendtheAt daily	refilledistankWhenever	Weekly	Monthly	Yearly	faultyIf	damagedIf	requiredAs
(extensive dust, highly resinous lumber, lumber from tropical trees, etc.). If the machine is only used
occasionally, the intervals can be extended accordingly.
Anti-vibration elements	Check	X						X
	Have them replaced by a servicing dealer1)								X
Air intake on fan housing	Clean		X		X					X
Cylinder fins	Clean		X			X
	Check idle adjustment – saw chain must not	X		X
	rotate
Carburetor
	Set the idle speed, have the chain saw repaired									X
	by a servicing dealer1)
Spark plug	Adjust electrode gap							X
	Replace after 100 hours of operation
All accessible screws, nuts and bolts (not adjusting	Tighten2)									X
screws)
	Have checked by a specialist dealer1)							X
Spark arresting screen in muffler
	Have cleaned by a specialist dealer, or replaced								X
	if necessary1)
Chain catcher	Check	X
	Replace								X
Exhaust bore	Decarbonise after 139 hours of operation, subse-									X
	quently after every 150 hours of operation
Safety information label	Replace								X

1)STIHL recommends STIHL servicing dealers

2)During initial use of professional chain saws (with a power output of 3.4 kW or more), tighten the cylinder block screws after 10 to 20 hours of operation

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