Quick Chain Tensioner; Chain Catcher - Stihl MS 231 Manual

2 2
1 3
: 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.
1
: 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
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4
1
– 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.
2
: 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.
5.5.2
– Remove the chain sprocket
cover.
The chain catcher (arrow) is an
integral part of the sprocket
cover (1).
1
– If the chain catcher is damaged
or worn, install a replacement

chain catcher.

1
: 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.
MS 231, MS 231 C, MS 251, MS 251 C
Chain Catcher
1
2