Stihl TS 420 - 5.4 Test sequence

TS 410, TS 420
English
23
This machine is equipped with an
automatic spring-action V
-
belt
tensioning device.
Prior to tensioning of the ribbed v-belt,
the nuts(1) must be loosened and the
arrow on the tensioning nut(2) must
point to 0.
N otherwise loosen the nuts(1) and
the tensioning nut(2) with the
combination wrench
counterclockwise –
approx.1/4turn, as far as
possible=0
N to tighten the ribbed v-belt, fit the
combination wrench over the
tensioning nut as illustrated
WARNING
The tensioning nut is spring-loaded –
hold the combination wrench securely.
N Turn the tensioning nut clockwise
approx.1/8turn – the tensioning nut
will be engaged by the spring
N Continue turning approx.1/8turn –
up to the stop
NOTICE
Do not turn the combination wrench
further by force.
The ribbed V
-
belt is automatically
tensioned by the force of the spring in
this position.
N Remove the combination wrench
from the tensioning nut
N Tighten up the nuts(1)
Retensioning the ribbed V
-
belt
The V
-
belt is retensioned without the aid
of the tensioning nut.
N Undo the nuts(1)
The V
-
belt is automatically tensioned by
the force of the spring.
N Tighten up the nuts(1) again
The engine must be switched off for
fitting or replacement – set slide control
to STOPor0.
Blocking the shaft
N Slide the locking pin(1) through the
bore in the V
-
belt guard
N Turn the shaft with the combination
wrench until the locking pin(1)
engages in the bore behind the
guard
Tensioning the ribbed V
-
belt
1
1
1
2
370BA037 KN
0
1
1
1
370BA012 KN
1
1
1
370BA013 KN
Mounting an Abrasive Wheel
370BA014 KN
1