Stihl MS 290 STIHL FARM BOSS Product Instruction Manual - Page 49

Maintaining and Sharpening, Saw Chain

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689BA020 KN 689BA021 KN English / USA Maintaining and Sharpening Saw Chain 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, cause high vibrations, produce unsatisfactory cutting results and a higher rate of wear. : Clean the chain. : Check the chain for cracks in the links and damaged rivets. : Replace any damaged or worn parts of the chain and match the new parts to the shape and size of the original parts. 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 chainsaw, with resulting risk of injury. 3/8 The chain pitch (e.g. 3/8") is marked on the depth gauge end of each cutter. Use only special saw chain sharpening files. Other files have the wrong shape and cut. Select file diameter according to chain pitch - see table "Sharpening Tools". You must observe certain angles when resharpening the chain cutter. A B A = Filing angle B = Side plate angle Chain type Rapid-Micro (RM) Rapid-Super (RS) Picco-Micro (PM/PMN) Angle (°) AB 30 85 30 60 30 85 Cutter shapes: Micro = Semi-chisel Super = Full chisel The specified angles A and B are obtained automatically if the recommended files or sharpening tools and correct settings are used. 48 MS 290, MS 310, MS 390

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48
English / USA
MS 290, MS 310, MS 390
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, cause high vibrations,
produce unsatisfactory cutting results
and a higher rate of wear.
:
Clean the chain.
:
Check the chain
for cracks in the
links and damaged rivets.
:
Replace any damaged or worn parts
of the chain and match the new
parts to the shape and size of the
original parts.
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 chainsaw, with
resulting
risk of injury
.
The chain pitch (e.g.
3
/
8
") is marked on
the depth gauge end of each cutter.
Use only special saw chain
sharpening files.
Other files have the
wrong shape and cut.
Select file diameter according to chain
pitch – see table “Sharpening Tools”.
You must observe certain angles when
resharpening the chain cutter.
A =
Filing angle
B =
Side plate angle
Cutter shapes:
Micro = Semi-chisel
Super = Full chisel
The specified angles A and B are
obtained automatically if the
recommended files or sharpening tools
and correct settings are used.
Maintaining and Sharpening
Saw Chain
3/8
689BA020 KN
Chain type
Angle (°)
A
B
Rapid-Micro (RM)
30
85
Rapid-Super (RS)
30
60
Picco-Micro (PM/PMN)
30
85
A
B
689BA021 KN