30
MS 231, MS 231 C, MS 251, MS 251 C
:
Inspect the cover (1), spur gear
set (2), tensioner slide (3) and
thrust pad (4) and replace as
necessary.
– Clean all disassembled parts,
b
14
– Lubricate thread and gears with
STIHL multipurpose grease,
b
14
– Reassemble in the reverse
sequence.
5.5.1
Quick Chain
Tensioner
The quick chain tensioner is
installed in the sprocket cover.
:
Apply tool to the side (arrow) of
the wing nut (1) and carefully pry
it out of the sprocket cover.
– Check the wing nut (1) and
replace if necessary
4
2
1
3
2
533RA058 TG
1
165RA469 TG
– Swing the wing nut (1) upright.
:
Push the wing nut (1), thin side
first (see arrow), into the opening
and press it down until it snaps
into position.
:
Take out the screw (arrow).
:
Remove the cover plate (1) and
adjusting wheel (2).
When installing the adjusting wheel,
make sure its teeth face the cover
plate.
– Reassemble in the reverse
sequence.
1
165RA007 TG
2310RA045 TG
1
2
5.5.2
Chain Catcher
– Remove the chain sprocket
cover.
The chain catcher (arrow) is an
integral part of the sprocket
cover (1).
– If the chain catcher is damaged
or worn, install a replacement
chain catcher.
:
Position the replacement chain
catcher (1) so that it lines up with
the contour of the
recess (arrows).
:
Insert and tighten down the
screw (2) firmly.
– Reassemble in the reverse
sequence.
2310RA048 TG
1
2310RA428 TG
1
2
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