Storing The Machine; Checking And Replacing The Chain Sprocket - Stihl MS 240 Instruction Manual

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Replacing a Broken Rewind Spring
N Remove the rope rotor as described
in "Replacing the Starter Rope".
The bits of spring must still be
under tension and could fly apart
when you take them out of the
housing. To reduce the risk of
injury, wear face protection and
work gloves.
N Carefully remove the bits of the
broken spring from the housing.
N Lubricate the new spring with a few
drops of non-resinous oil.
N Remove the spring housing and
pieces of spring.
N
Fit the new spring housing. The
bottom plate must face up. Slip the
outer spring loop over the lug.
N Fit the rope rotor and tension the
rewind spring.
N Refit the fan housing and secure it in
position.
If the spring pops out of the spring
housing and uncoils: refit it
counterclockwise, starting outside and
working inwards.
34

Storing the Machine

For periods of 3 months or longer
N Drain and clean the fuel tank in a
well ventilated area.
N Dispose of fuel properly in
accordance with local
environmental requirements.
N Run the engine until the carburetor
is dry – this helps prevent the
carburetor diaphragms sticking
together.
N Remove the saw chain and guide
bar, clean them and spray with
corrosion inhibiting oil.
N
Thoroughly clean the machine –
pay special attention to the cylinder
fins and air filter.
N If you use a biological chain and bar
lubricant, e.g. STIHL BioPlus,
completely fill the chain oil tank.
N Store the machine in a dry, high or
locked location, out of the reach of
children and other unauthorized
persons.
Checking and Replacing
the Chain Sprocket
N
Remove chain sprocket cover, saw
chain and guide bar.
N Release chain brake – pull hand
guard against the front handle
Fit new chain sprocket
– after use of two saw chains or
earlier
– if the wear marks (arrows) are
deeper than 0.5 mm – otherwise the
service life of the saw chain is
reduced – use check gauge (special
accessory) to test
Using two saw chains in alternation
helps preserve the chain sprocket.
STIHL recommends use of original
STIHL chain sprockets in order to
ensure optimal functioning of the chain
brake.
MS 240