Instruction Manual

MS 170, MS 170 C, MS 180, MS 180 C
English
36
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.
N Use a screwdriver to remove the E-
clip
N Remove washer
N Remove the chain sprocket
together with the needle cage from
the crankshaft
Install chain sprocket
N Clean crankshaft stub and needle
cage and lubricate with STIHL
lubricant (special accessory)
N Slide needle cage onto the
crankshaft stub
N After refitting, turn the chain
sprocket approx. 1 full turn so that
the carrier for the oil pump drive
engages
N Refit 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