Stihl 090 Instruction Manual / Owners Manual page 42

Top: RI. position for Rapld-slandard, Rapid-Micro and
Topic~M i cro
Bottom: Sh""",ning with file holder
..
,.
i
cutter
heights will be uneven
~
the
cutter lengths are diffe-
rent. If the cutters are
not
all the same height the chaln will
run roughly and eventually break.
I's ~
is very Important to.achieve unijonm cutler lengths,
~
is
best
to measure them with a slide caliper. Find and shar-
pen the shortest cutter first and then use
~
as a master for
all the others, J. e. all cutlers must be filed
back
to the
same length as the mester cutler. Sharpen all the cutters
on one side of
the
chaln first and then repeat the proce-
dure on the other side.
The file must be held level for Rapld-standard, Rapid-
File
position tor Aapid-5uper and Toplc·Super
-
to'
Micro and Topic-Micro chain so that
~
is
at
90'
to the
perpendicular faces of the chaln 'Iinks or the guide bar,
On Rapid-Super and Topic-Super chains the file must be
gulded' so that the handle Is
10'
lower
than
the tip of the
file,
i.
e. In this case the file must run upward
at
an angle of
10'
to the horizontal. A filing aid (file holder, filing
too~
must
always be used for sharpening Rapid-Super and Toplc-Su-
per chains.
File evenly and steadily and note that the file only shar-
pens on the forward stroke- Uft the file off the cutter on
the backstroke. Make sure you do not touch the tie straps
and drive links with the file. Use a piece of hardwood to re-
move bunrs from the cutting edge.
Importam: Sharpen the chain frequemly and take away
as little material as possible. Two or'three strokes of
the
file
are usually suffciem to the keep the chain sharp. varia-
tions In angles and the lengths of the cutlers cannot be
completely avoided during manual sharpening. For this
reason the chaln should be restored to
~
Original condi-
tion with a workshop chain sharpener (STIHL USG, SnHL
FG 2)' after
rt
has been resharpened about five times by
hand.
41