Stihl MS 171 Manual page 27

7.4 Flat Spring
The flat spring and hand guard cam
hold the hand guard in position.
– Remove the brake lever, b 7.3
1
: Pull out the flat spring (1), check
it and replace if necessary.
1
: Push the flat spring (1) into the
guides (arrows).
– Lubricate the flat spring, b 16
– Reassemble all other parts in the
reverse sequence.
– Tightening torques, b 3.5
26
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7.5 Pins
The anchor pins secure the springs.
Worn pins must be replaced.
All parts have been removed from
the pins in the following illustrations
for greater clarity.
3 2
– Remove the engine, b 8.5
: Use a suitable punch to drive out
the pins (1+2) in the direction of
the engine – use suitable
support.
: Use a suitable punch to drive out
the pin (3) in the direction of the
clutch – use suitable support.
1
– Before installing the new pin (1),
coat its knurled shank with
Loctite, b 16
: Position the new pin (1) in the
bore (arrow) so that the knurling
on the pin meshes with the
existing knurling in the bore. Turn
pin back and forth as necessary.
3
1
: Drive home pins (1+2+3) to
specified lengths.
3
View from air filter side.
: Carefully tap home the pins
squarely to obtain the following
dimensions:
Pin (1) a = 8.9 mm
Pin (2) b = 12.1 mm
Pin (3) c = 4.0 mm
– Reassemble all other parts in the
reverse sequence.
– Tightening torques, b 3.5
– Lubricate the brake lever and flat
spring, b 16
2
1
b
2
1
a
c
MS 171, MS 181, MS 211