Checking And Replacing The Chain Sprocket - Stihl MS 150 TC Manual De Instrucciones

English
Checking and Replacing the
Chain Sprocket
Remove the chain sprocket cover,
N
chain and guide bar.
Disengage the chain brake: Pull the
N
hand guard toward the front handle.
Replace the chain sprocket
after using two saw chains or
–
sooner
if the wear marks (arrows) on the
–
sprocket are deeper than about
0.02 in (0.5 mm) since this would
reduce the life of the chain. You can
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.
38
A locking strip is required to block the
piston in the cylinder when the chain
sprocket and clutch are removed and
installed as described below. The
locking strip is supplied as standard with
the replacement sprocket.
STIHL recommends the use of original
STIHL sprockets to ensure correct
operation of the chain brake.
Removing
2
Remove the spark plug boot (1).
N
Unscrew the spark plug (2).
N
Turn the clutch until the piston is
N
about bottom dead center.
3
Insert the locking strip (3) into the
N
cylinder through the spark plug
hole.
Turn the clutch clockwise until the
N
piston butts against the locking
strip.
Loosen the clutch hexagon
N
clockwise (left-hand thread).
Unscrew the clutch.
N
4
Pull the chain sprocket (4) and
N
needle cage (5) off the crankshaft.
Clean the crankshaft stub and
N
needle cage, and lubricate with
STlHL grease (special accessory).
Installing
Push the needle cage and chain
N
sprocket onto the crankshaft.
Screw the clutch onto the
N
crankshaft (counterclockwise).
Tighten down the clutch to a torque
N
of 15 Nm.
Remove the locking strip from the
N
cylinder. Fit the spark plug and
tighten it down firmly.
Refit boot on the spark plug.
N
MS 150 TC