MS 251, MS 251 C
English
53
Anti-vibration elements
Check
X
X
Have them replaced by a servicing dealer
1)
X
Air intake on fan housing
Clean
X
X
X
Cylinder fins
Clean
X
X
Carburetor
Check idle adjustment – saw chain must not
rotate
X
X
Set the idle speed, have the chain saw repaired
by a servicing dealer
1)
X
Spark plug
Adjust electrode gap
X
Replace after 100 hours of operation
All accessible screws, nuts and bolts (not adjusting
screws)
Tighten
2)
X
Spark arresting screen in muffler
Have checked by a specialist dealer
1)
X
Have cleaned by a specialist dealer, or replaced
if necessary
1)
X
Chain catcher
Check
X
Replace
X
Exhaust bore
Decarbonise after 139 hours of operation, subse
-
quently after every 150 hours of operation
X
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
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.
B
ef
ore
s
ta
rtin
g
wo
rk
At
the
e
nd
of
work
and
/or
da
ily
Whe
never ta
nk is refille
d
Wee
kly
Mon
thl
y
Ye
arly
If fa
ul
ty
If
dama
ged
As
requ
ired
Summary of Contents for MS 251
Page 2: ...Instruction Manual 1 61 Manual de instrucciones 62 127 ...
Page 130: ...MS 251 MS 251 C español EE UU 128 ...
Page 131: ......