Assembling The Unit - Stihl SR 420 Instruction Manual

English
the instruction manual. Have all other work per‐
formed by a servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer. STIHL dealers are
regularly given the opportunity to attend training
courses and are supplied with the necessary
technical information.
Only use high-quality replacement parts in order
to avoid the risk of accidents and damage to the
machine. If you have any questions in this
respect, consult a servicing dealer.
STIHL recommends the use of genuine STIHL
replacement parts. They are specifically
designed to match your model and meet your
performance requirements.
To reduce the risk of injury, always shut off the
engine before carrying out any maintenance or
repairs or cleaning the machine. – Exception:
Carburetor and idle speed adjustments.
Do not turn the engine over on the starter with
the spark plug boot or spark plug removed
unless the slide control / stop switch is on STOP
or 0 since there is otherwise a risk of fire from
uncontained sparking.
To reduce the risk of fire, do not service or store
your machine near open flames.
Check the fuel filler cap for leaks at regular inter‐
vals.
Use only a spark plug of the type approved by
STIHL and make sure it is in good condition –
see "Specifications".
Inspect the ignition lead (insulation in good con‐
dition, secure connection).
Check the condition of the muffler.
To reduce the risk of fire and damage to hearing,
do not operate your machine if the muffler is
damaged or missing.
Do not touch a hot muffler since burn injury will
result.
Vibration behavior is influenced by the condition
of the AV elements – check the AV elements at
regular intervals.
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3

Assembling the Unit

NOTICE
The throttle cable is already connected and must
not be kinked during assembly.
3.1 Mounting the Elbow
The combination wrench and carburetor screw‐
driver are stowed on the underside of the
machine.
► Line up the stops on the elbow and stub and
push the elbow (1) into the stub (2) as far as it
will go. Fit the nut (3) in the hexagon recess in
the stub
► Insert the screw in the nut from the other side
and tighten moderately – the elbow must still
turn.
3.2 Mounting the Extension Tube
1
► Rotate the pleated hose (1) as far as stop.
► Swing control handle (2) to horizontal position.
3 Assembling the Unit
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3
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