Stihl TS 420 Manual page 85

1
: Remove the screw (arrow).
– Remove the lever (1).
1
: Take off the ring (1) and the
sealing ring underneath.
– Pull out the air valve shaft,
unhooking and relieving the
torsion spring at the same time.
– Clean the air valve shaft and
guides, b 14.
84
1
3
2
– Examine the air valve shaft (1),
ring (2), sealing ring (3) and
torsion spring (4), replace if
necessary.
– Note the installed position (arrow)
of the torsion spring.
3
2
Ring (2) and sealing ring (3) must
be present.
: Push the air valve shaft (1) into
the air valve housing (arrow).
: Hook the leg of the torsion spring
into the connector (arrow) on the
air valve housing.
1
4
: Turn the lever on the air valve
shaft (1) clockwise until it is
above the connector (arrow).
– Push the air valve shaft in as far
as possible and hold it there.
1
1
: Fit the sealing ring (2) and
ring (1).
1
: Slide the lever (1) into the hole
(arrow) on the air valve shaft so
that the number is no longer
visible.
– Insert and tighten down the
screw.
2
TS 410, TS 420