► Use a screwdriver to remove the E-clip
► Remove washer
► Remove the chain sprocket together with the
needle cage from the crankshaft
27.2
Install chain 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 chain sprocket approx.
1 full turn so that the carrier for the oil pump
drive engages
► Refit washer and E-clip on the crankshaft
28 Maintaining and Sharpen‐
ing the Saw Chain
28.1
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!
28.2
Chain pitch
689BA027 KN
a
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.
28.3
Sharpening and side plate
angles
A
B
689BA021 KN
A Sharpening angle
STIHL saw chains are sharpened with a 30°
sharpening angle. Ripping chains, which are
sharpened with a 10° sharpening angle, are
28 Maintaining and Sharpening the Saw Chain
English
0458-206-0121-C
31
Summary of Contents for MS 170
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