Stihl MS 251

MS 251, MS 251 C
English
25
N Fit the guide bar over the studs (1) –
the cutting edges on the top of the
bar must point to the right.
N Engage the peg of the tensioner
slide in the locating hole (2) –- place
the chain over the sprocket (3) at
the same time.
N Turn the tensioning
screw (4)clockwise until there is
very little chain sag on the
underside of the bar – and the drive
link tangs are engaged in the bar
groove.
N Refit the sprocket cover and screw
on the nut only fingertight.
N Go to chapter on "Tensioning the
Saw Chain"
Removing the chain sprocket cover
N Swing grip (1) into position (until it
engages)
N Turn the wing nut (2) to the left until
it hangs loosely in the chain
sprocket cover (3)
N Remove chain sprocket cover (3)
Mounting the tensioning gear
N Remove and reverse tensioning
gear (1)
N Remove screw (2)
N Position tensioning gear (1) and
guide bar (3) relative to one another
N Insert and tighten screw (2)
3
1
1
2
4
001BA187 KN
Mounting the Bar and Chain
(quick chain tensioner)
1
2
3
2310BA013 KN
1
2310BA014 KN
2310BA015 KN
2
1
3
2310BA016 KN
2
2310BA017 KN