Maintaining And Sharpening The Saw Chain - Stihl MS 231 Instruction Manual

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5
4
► Use a screwdriver to remove the E-clip (1)
► Remove the washer (2)
► Remove rim sprocket (3)
► Inspect transport profile on the clutch drum (4)
– if there are also heavy signs of wear, also
replace the clutch drum
► 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
34
6
2
1
3
6
2
1

29 Maintaining and Sharpening the Saw Chain

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.
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
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
0458-737-8321-C