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23 Checking and Replacing
the Chain Sprocket
► Remove the chain sprocket cover, chain and
guide bar.
► Disengage the chain brake: Pull the hand
guard towards the front handle.
23.1
Replace the chain sprocket
– after using two saw chains or sooner
– if the wear marks (arrows) on the sprocket are
deeper than approx. 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.
STIHL recommends the use of original STIHL
sprockets to ensure correct operation of the
chain brake.
4
► Use a screwdriver to remove the E-clip (1).
► Remove the washer (2).
► Remove the rim sprocket (3).
► Examine the splines on the clutch drum (4) – if
the wear marks are severe, fit a new clutch
drum.
► If the machine has a QuickStop Super chain
brake, first press the throttle trigger lockout.
Then pull the clutch drum with needle cage (5)
off the crankshaft.
72
3
5
2
1
23 Checking and Replacing the Chain Sprocket
23.2
Installing the Chain Sprocket
► Clean the crankshaft stub and needle cage,
and lubricate with STlHL grease (special
accessory).
► Push the needle cage on to the crankshaft.
► If the machine has a QuickStop Super chain
brake, first press the throttle trigger lockout.
Then rotate the clutch drum about 1 complete
turn to engage the oil pump drive.
► Fit rim sprocket with cavities facing outward.
► Refit the washer and E-clip on the crankshaft.
24 Maintaining and Sharpe‐
ning the Saw Chain
24.1
Sawing effortlessly with a prop‐
erly 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.
► Clean the saw chain
► Check the saw chain for cracks and damaged
rivets
► 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.
0458-562-8721-B
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