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The drive link tangs will otherwise scrape along
the bottom of the groove – the cutters and tie
straps will not ride on the bar rails.
20 Motor Cooling
► Use a dry brush or similar tool to clean the
cooling slots at regular intervals – see "Mainte‐
nance Chart".
21 Storing the Machine
For periods of 3 months or longer
► Disconnect the plug from the wall outlet.
► Remove the saw chain and guide bar, clean
them and spray with corrosion inhibiting oil.
► Thoroughly clean the machine, especially the
cooling air inlets.
► If you use a biological chain and bar lubricant,
e.g. STIHL BioPlus, completely fill the chain oil
tank.
► Store the machine in a dry and secure location
– out of the reach of children and other unau‐
thorized persons.
22 Checking and Replacing
the Chain Sprocket
► Disconnect the plug from the wall outlet.
► Remove the chain sprocket cover, chain and
guide bar.
22.1
Replacing the Chain Sprocket
1 Chain sprocket (8 teeth)
24
a
– replace after using two saw chains or sooner
– if the wear marks (a) on the sprocket are
deeper than 0.5 mm – the life of the chain
would otherwise be reduced. Use reference
gauge (special accessory) to check the depth
of the wear marks.
It is best to use two saw chains in rotation with
one sprocket.
STIHL recommends the use of original STIHL
sprockets to ensure correct operation of the
chain brake.
3
1
► Ease the E-clip (1) off the shaft.
► Remove and inspect the washer (3) – replace
it if it shows signs of wear.
► Install the new chain sprocket in the reverse
sequence.
23 Maintaining and Sharpen‐
ing the Saw Chain
23.1
Cutting effortlessly with a cor‐
rectly sharpened chain
A properly sharpened chain slices through wood
effortlessly and requires very little feed pressure.
Do not work with a dull or damaged chain as it
will increase the physical effort required, produce
unsatisfactory results and a higher rate of wear.
► Clean the chain.
► Check the chain for cracks in the links and
damaged rivets.
► Replace any damaged or worn parts of the
chain and match the new parts to the shape
and size of the original parts.
Carbide-tipped saw chains (Duro) are particularly
wear resistant. STIHL recommends you have
your chain resharpened by a STIHL servicing
dealer.
20 Motor Cooling
0458-764-0121-B
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