Stihl MS 291

31MS 271 C, MS 291 C
Machines with QuickStop Super
: Drive home the pins (5 and 6) as
specified below.
: Pin (5) b = about 10.4 - 10.8 mm
Pin (6) a = about 2.9 - 3.3 mm
– Reassemble all other parts in the
reverse sequence.
– Lubricate the brake and cam
levers, b
14
2710RA059 TG
5
6
a
b
0001RA065 TG
6
5
5.7 Chain Tensioner
– Troubleshooting, b
3.2
– Remove the side plate, b
5.2
: Turn the spur gear (2) clockwise
until the tensioner slide (1) butts
against the right-hand end and
the screw (3) is visible.
: Take out the screw (3).
: Pull out the spur gear (2) and
tensioner slide (1).
– Inspect the thrust pad (3),
support (4), tensioner slide (1),
spur gear set (2) and replace as
necessary.
– Clean all disassembled parts,
b
14
– Lubricate thread with STIHL
multipurpose grease, b
14
– Reassemble in the reverse
sequence.
2710RA060 TG
1
2
3
42
1 3
2
533RA058 TG
5.7.1 Quick chain
tensioner
The quick chain tensioner is
installed in the sprocket cover.
: Carefully pry the side (arrow) of
the wing nut (1) out of the
sprocket cover.
– Check the wing nut (1) and
replace if necessary
– 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.
1
165RA469 TG
1
165RA007 TG