Stihl MS 251 Manual De Instrucciones página 58

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
(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
Air intake on fan housing
Cylinder fins
Carburetor
Spark plug
All accessible screws, nuts and bolts (not adjusting
screws)
Spark arresting screen in muffler
Chain catcher
Exhaust bore
Safety information label
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
56
Check
Have them replaced by a servicing dealer
Clean
Clean
Check idle adjustment – saw chain must not
rotate
Set the idle speed, have the chain saw repaired
1)
by a servicing dealer
Adjust electrode gap
Replace after 100 hours of operation
2)
Tighten
Have checked by a specialist dealer
Have cleaned by a specialist dealer, or replaced
1)
if necessary
Check
Replace
Decarbonise after 139 hours of operation, subse-
quently after every 150 hours of operation
Replace
X
1)
X
X
X X
1)
X
X
X
X
X
X
X
X
X
X
MS 251, MS 251 C
X
X
X
X