Instruction Manual

MS 170, MS 170 C, MS 180, MS 180 C
English
43
N Remove the chain sprocket cover,
chain and guide bar.
N Disengage the chain brake: Pull the
hand guard toward the front handle.
Replace the chain sprocket
– after using two saw chains or
sooner
– if the wear marks (arrows) are
deeper than 0.02 in (0.5 mm) since
this would reduce the life of the
chain. Use a 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.
N Use a screwdriver to remove the E-
clip.
N Remove the washer.
N Pull the sprocket and needle cage
off the crankshaft.
Installing the chain sprocket
N Clean the crankshaft stub and
needle cage, and lubricate with
STlHL grease (special accessory).
N Push the needle cage on to the
crankshaft.
N After fitting the chain sprocket,
rotate it about one turn to engage oil
pump drive.
N Refit the washer and E-clip on the
crankshaft.
Sawing effortlessly with a properly
sharpened saw chain
A properly sharpened saw chain cuts
through wood effortlessly even with very
little pushing.
Never use a dull or damaged saw chain
– this leads to increased physical strain,
increased vibration load, unsatisfactory
cutting results and increased wear.
N Clean the saw chain
N Check the saw chain for cracks and
damaged rivets
N Replace damaged or worn chain
components and adapt these parts
to the remaining parts in terms of
shape and level of wear – rework
accordingly
Carbide-tipped (Duro) saw chains are
especially wear-resistant. For an optimal
sharpening result, STIHL recommends
STIHL servicing dealers.
WARNING
Compliance with the angles and
dimensions listed below is absolutely
necessary. An improperly sharpened
saw chain – especially depth gauges
that are too low – can lead to increased
kickback tendency of the chain saw –
risk of injury!
Checking and Replacing the
Chain Sprocket
143BA042 KN
001BA086 KN
Maintaining and Sharpening
the Saw Chain