Stihl HT 75 Instruction Manual - Page 38

Maintaining and Sharpening Saw Chain, Correctly sharpened chain

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Maintaining and Sharpening Saw Chain english 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 saw chain as it will increase the physical effort required, produce unsatisfactory 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 by filing back as necessary. It is necessary to comply with the angles and dimensions specified below. If the saw chain is incorrectly sharpened - especially if the depth gauges are too low - there is an increased risk of kickback and resulting injury! The pruner's saw chain cannot be locked in place on the guide bar. Therefore, it is best to remove the chain from the bar and resharpen it on a workshop sharpening tool (FG 2, HOS, USG). : Select the appropriate sharpening tools for the chain pitch. See "Specifications" for the permitted chain pitches. 3/8 The chain pitch (e.g. 3/8) is marked on the depth gauge of each cutter. Use only special saw chain files! Other files have the wrong shape and cut. 689BA020 KN 689BA021 KN Select the file diameter according to the chain pitch (se table "Sharpening Tools" at the end of this chapter). You must also observe the following angles when resharpening the chain cutters. A B A = Filing angle B = Side plate angle Chain type Picco Micro Mini (PMN) Angle (°) AB 30 85 Cutter shape: Micro = Semi-chisel Specified angles A and B are more readily obtained if recommended files or sharpening tools and correct settings are used. HT 70, HT 75 37

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37
HT 70, HT 75
english
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 saw
chain as it will increase the physical
effort required, produce unsatisfactory
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 by filing back as
necessary.
It is necessary to comply with the
angles and dimensions specified
below. If the
saw
chain is
incorrectly sharpened
– especially
if the depth gauges are too low –
there is an increased risk of
kickback and resulting
injury!
The pruner’s saw chain cannot be
locked in place on the guide bar.
Therefore, it is best to remove the
chain from the bar and resharpen it
on a workshop sharpening tool
(FG 2, HOS, USG).
:
Select the appropriate sharpening
tools for the chain pitch.
See "Specifications" for the
permitted chain pitches.
The chain pitch (e.g. 3/8) is marked on
the depth gauge of each cutter.
Use only special saw chain files!
Other files have the wrong shape and
cut.
Select the file diameter according to the
chain pitch (se table "Sharpening Tools"
at the end of this chapter).
You must also observe the following
angles when resharpening the chain
cutters.
A =
Filing angle
B =
Side plate angle
Cutter shape: Micro = Semi-chisel
Specified angles A and B are more
readily obtained if recommended files or
sharpening tools and correct settings
are used.
Maintaining and Sharpening
Saw Chain
3/8
689BA020 KN
Chain type
Angle (°)
A
B
Picco Micro Mini (PMN)
30
85
A
B
689BA021 KN