Stihl MS 251 Manual De Instrucciones página 57

The following intervals apply to normal operating conditions only. If your daily work-
ing time is longer or operating conditions are difficult (very dusty work area, resin-
rich wood, tropical wood, etc.), shorten the specified intervals accordingly. If you only
use the saw occasionally, extend the intervals accordingly.
Cooling inlets
Air inlet on fan housing
Cylinder fins
Preseparator port and carburetor body
"Carb preheat" shutter and preheating port Clean (winter operation only)
Carburetor
Spark plug
All accessible screws and nuts (not adjust-
3)
ing screws)
4)
Spark arresting screen in muffler
Chain catcher
Exhaust port
Safety labels
1)
STIHL recommends a STIHL servicing dealer.
2)
see chapter on "Chain Brake"
3)
Firmly tighten down the cylinder base screws of professional saws (3.4 kW or more) after 10 to 20 hours of operation.
4)
not in all versions, market-specific
MS 251, MS 251 C
Clean
Clean
Clean
Clean
Check idle adjustment – chain must not
rotate
Readjust idle
Readjust electrode gap
Replace after every 100 operating hours
Retighten
Check
Clean or replace
Check
Replace
Decoke after first 139 hours of opera-
tion, then every 150 hours
Replace
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English
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X
X
X
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X
X
X
X
X
X
X
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