Checking And Replacing The Chain Sprocket - Stihl MS 193 T Instruction Manual

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Checking and Replacing the
Chain Sprocket
Remove the chain sprocket cover,
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chain and guide bar.
Disengage the chain brake: Pull the
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hand guard towards 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
0.5 mm (0.02 in) 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.
STIHL recommends the use of original
STIHL sprockets to ensure correct
operation of the chain brake.
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Removing
2
Remove the spark plug boot (1).
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Unscrew the spark plug (2).
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3
2.
Insert the locking strip (3) sideways
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in the cylinder (1) and then turn it
through 90° (2).
Rotate the clutch clockwise as far as
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stop
Loosen the clutch hexagon
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clockwise (left-hand thread).
Unscrew the clutch.
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Pull the chain sprocket (4) and
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needle cage (5) off the crankshaft.
Clean the crankshaft stub and
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needle cage, and lubricate with
STlHL grease (special accessory).
Assembling
Push the needle cage and chain
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1.
sprocket onto the crankshaft.
Screw the clutch onto the
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crankshaft (counterclockwise).
Tighten down the clutch firmly.
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Remove the locking strip from the
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cylinder. Fit the spark plug and
tighten it down firmly.
Refit boot on the spark plug.
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MS 193 T, MS 193 TC