Removing The Counter-Blade; Installing The Counter-Blade; Reversing The Blades - Stihl GHE 420 Manual De Instrucciones

● Position the assembly tool (15) on the
blade fastening screw (14) and turn
clockwise slowly and carefully until the
blade discs are stopped by the stop.
Detach the assembly tool (15).
Risk of injury:
The blade cover must always be
attached in order to tighten the
blade fastening screw (see
view Z).
● Install the blade cover. (
● Insert the assembly tool (15) into the
bore of the blade cover (16) and
position on the blade fastening
screw (14).
● Tighten the blade fastening screw (14)
to 36 - 44 Nm.
● Install the feed chute ATO 400. (

11.5 Removing the counter-blade

Risk of injury:
Always wear thick
gloves.
● Remove the feed chute ATO 400 and
the blade cover. ( 11.2), (
● Unscrew and remove the screw (1).
● Remove the counter-blade (2) from
above.

11.6 Installing the counter-blade

Risk of injury:
Always wear thick
gloves.
0478 201 9916 A - EN
● Remove the feed chute ATO 400 and
the blade cover. (
● Insert the counter-blade (1) into the
mounting (2) in the housing.
● Screw in the screw (3) and tighten to
28 - 32 Nm.
● Install the feed chute ATO 400. (

11.7 Reversing the blades

7.5)
Risk of injury:
Always wear thick
gloves.
When the blades are blunt, we
recommend that you reverse all the
blades on the particular blade disc.
7.6)
All blades (regardless of the blade
geometry) are reversed in the same
way.
● Removing the blade discs. (
23
Risk of injury:
To prevent injuries, always clamp
down the blade discs before
installing or removing the blades.
Reversing the four blades of the soft
7.4)
material blade disc (Figure A):
1. Removing:
● Unscrew screws (1) and remove
together with nuts (2).
● Remove blade (3) upwards.
2. To install:
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● Clean the blade disc.
● Reverse blade (3) and place onto the
blade disc with the sharp edge exposed
and align the bores.
● Insert screws (1) through the bores and
11.2), ( 7.4) screw on nuts (2). Tighten nuts (2) to
8 - -10 Nm.
Reversing the three blades of the hard
material blade disc (Figure B):
1. Removing:
7.6) ● Unscrew the screws (4) and M8
screws (5) and remove them together
with the nuts (6) and M8 nuts (7).
● Lift off the blades (8) and blade (9).
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2. To install:
● Clean the blade disc.
● Reverse the blades (8) and place onto
the blade disc with the sharp edge
exposed and align the bores.
● Insert screws (4) through the bores and
11.3)
screw on nuts (6). Do not tighten.
● Press the two blades (8) together (see
small illustration) and hold. There must
be no gap between the two blades (8).
● Tighten nuts (6) to 8 - -10 Nm.
● Reverse the blade (9) and place onto
the blade disc with the sharp edge
exposed.
● Insert the M8 screws (5) through the
bores, screw on the M8 nuts (7) and
tighten to 16 - 20 Nm.
There must be no gap between the
two blades (8) following installation.
A gap between the two blades
impairs the feeding function.
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