Maintaining And Sharpening The Saw Chain - Stihl MS 241 C-M Instruction Manual

29 Maintaining and Sharpening the Saw Chain

► Remove clutch drum or spur chain
sprocket (5) including needle cage (6) from the
crankshaft – with QuickStop Super chain
brake, press throttle trigger lockout before‐
hand
28.2 Install spur chain sprocket / rim
sprocket
► Clean crankshaft stub and needle cage and
lubricate with STIHL lubricant (special acces‐
sory)
► Slide needle cage onto the crankshaft stub
► After refitting, turn the clutch drum and/or spur
chain sprocket approx. 1 full turn so that the
carrier for the oil pump drive engages – with
QuickStop Super chain brake, press throttle
trigger lockout beforehand
► Refit the rim sprocket – cavities toward the
outside
► Refit washer and E-clip on the crankshaft
29 Maintaining and Sharpen‐
ing the Saw Chain
29.1 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.
0458-738-0121-C
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!
29.2 Chain pitch
The chain pitch marking (a) is embossed in the
area of the depth gauge of each cutter.
Marking (a)
7
1 or 1/4
6, P or PM
2 or 325
3 or 3/8
4 or 404
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.
29.3 Sharpening and side plate
angles
A
B
A Sharpening angle
STIHL saw chains are sharpened with a 30°
sharpening angle. Ripping chains, which are
sharpened with a 10° sharpening angle, are
English
a
Chain pitch
Inches mm
1/4 P 6.35
1/4 6.35
3/8 P 9.32
0.325 8.25
3/8 9.32
0.404 10.26
33