SP 451, SP 481
English
21
Visual Inspection
N Visually inspect the whole machine
before each use and after every
refueling stop.
Screws and Nuts
N Check all accessible screws and
nuts (not the carburetor adjusting
screws) about every 25 hours of
operation.
N Check the screw union of the shaft
and pushrod in the hand guard after
every refueling stop – see
"Assembling the Unit".
Replacing the Rubber Element on the
Hook
Removing the rubber element
N Use a suitable tool to pry the clips
(1) out of the hook (2).
N Do not re-use damaged or bent
clips. Always fit new ones.
N Cut the worn rubber element (3) so
that it can be easily pulled off the
hook.
Installing the rubber element
N Coat the new rubber element (3)
and the hook (2) thoroughly with
STIHL press fluid OH 723 – see
"Special Accessories".
N Push the hook into the rubber
element as shown.
N Insert the clips (1) in the rubber
element and press them home as
far as stop.
Inspection and
Maintenance by User
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