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 Sharpen‐
ing 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.
WARNING
Compliance with the angles and dimensions lis‐
ted 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!
24.2 Chain pitch
The chain pitch marking (a) is embossed in the
area of the depth gauge of each cutter.
Marking (a) Chain pitch
Inches mm
7 1/4 P 6.35
1 or 1/4 1/4 6.35
6, P or PM 3/8 P 9.32
2 or 325 0.325 8.25
3 or 3/8 3/8 9.32
4 or 404 0.404 10.26
The diameter of file to be used depends on the
chain pitch – see table "Sharpening tools".
The angles of the cutter must be maintained dur‐
ing resharpening.
24.3 Sharpening and side plate
angles
A Sharpening angle
STIHL saw chains are sharpened with a 30°
sharpening angle. Ripping chains, which are
sharpened with a 10° sharpening angle, are
24 Maintaining and Sharpening the Saw Chain English
0458-567-0121-B 31