Stihl MSE 250 C Instruction Manual - Page 38

Maintaining and Sharpening, the Saw Chain

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English Maintaining and Sharpening the Saw Chain Cutting effortlessly with a correctly sharpened chain A properly sharpened chain slices through wood effortlessly and requires very little feed pressure. Do not work with a dull or damaged chain as it will increase the physical effort required, produce unsatisfactory results and a higher rate of wear. N Clean the chain. N Check the chain for cracks in the links and damaged rivets. N Replace any damaged or worn parts of the chain and match the new parts to the shape and size of the original parts. Carbide-tipped saw chains (Duro) are particularly wear resistant. STIHL recommends you have your chain resharpened by a STIHL servicing dealer. WARNING It is absolutely essential to comply with the angles and dimensions specified below. If the saw chain is incorrectly sharpened - and in particular if the depth gauge is set too low - there is a risk of increased kickback of the saw, with resulting risk of injury. Chain pitch a The chain pitch (a) is marked on the depth gauge end of each cutter. Mark (a) 7 1 or 1/4 6, P or PM 2 or 325 3 or 3/8 4 or 404 Chain pitch inch 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 Select file diameter according to chain pitch - see table "Sharpening Tools". You must observe certain angles when resharpening the chain cutter. Filing and side plate angles A B A Filing angle 689BA027 KN STIHL saw chains are sharpened to a filing angle of 30°. Exceptions are ripping chains with a filing angle of 10°. Ripping chains have an X in their designations. B Side plate angle The correct side plate angle is obtained automatically if you use the prescribed file holder and file diameter. Cutter shapes Angle (°) AB Micro = semi chisel cutter, 30 75 e.g. 63 PM3, 26 RM3, 36 RM Super = chisel cutter, e.g. 30 60 63 PS3, 26 RS, 36 RS3 Ripping chain, e.g. 63 PMX, 36 RMX 10 75 The angles must be the same on all cutters. If the angles are uneven: Chain will run roughly, not in a straight line, wear quickly and finally break. File holder N Use a file holder A file holder must be used for manual resharpening (see table "Sharpening Tools"). The correct filing angles are marked on the file holder. 689BA021 KN 689BA025 KN 36 MSE 250 C

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MSE 250 C
English
36
Cutting effortlessly with a correctly
sharpened chain
A properly sharpened chain slices
through wood effortlessly and requires
very little feed pressure.
Do not work with a dull or damaged
chain as it will increase the physical
effort required, produce unsatisfactory
results and a higher rate of wear.
N
Clean the chain.
N
Check the chain for cracks in the
links and damaged rivets.
N
Replace any damaged or worn
parts of the chain and match the
new parts to the shape and size of
the original parts.
Carbide-tipped saw chains (Duro) are
particularly wear resistant. STIHL
recommends you have your chain
resharpened by a STIHL servicing
dealer.
WARNING
It is absolutely essential to comply with
the angles and dimensions specified
below. If the saw chain is incorrectly
sharpened – and in particular if the depth
gauge is set too low – there is a risk of
increased kickback of the saw, with
resulting
risk of injury
.
Chain pitch
The chain pitch (
a
) is marked on the
depth gauge end of each cutter.
Select file diameter according to chain
pitch – see table “Sharpening Tools”.
You must observe certain angles when
resharpening the chain cutter.
Filing and side plate angles
A
Filing angle
STIHL saw chains are sharpened to a
filing angle of 30°. Exceptions are
ripping chains with a filing angle of 10°.
Ripping chains have an X in their
designations.
B
Side plate angle
The correct side plate angle is obtained
automatically if you use the prescribed
file holder and file diameter.
The angles must be the same on all
cutters. If the angles are uneven: Chain
will run roughly, not in a straight line,
wear quickly and finally break.
File holder
N
Use a file holder
A file holder must be used for manual
resharpening (see table "Sharpening
Tools"). The correct filing angles are
marked on the file holder.
Maintaining and Sharpening
the Saw Chain
Mark (
a
)
Chain pitch
inch
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
689BA027 KN
a
A
B
689BA021 KN
Cutter shapes
Angle (°)
A
B
Micro = semi chisel cutter,
e.g. 63 PM3, 26 RM3,
36 RM
30
75
Super = chisel cutter, e.g.
63 PS3, 26 RS, 36 RS3
30
60
Ripping chain, e.g.
63 PMX, 36 RMX
10
75
689BA025 KN