Sharpening Metal Cutting Blades; Maintaining The Mowing Head - Stihl FS 70 Instruction Manual

English
► Start the engine and run it at idling speed until
it stops.
► Remove, clean and inspect the cutting attach‐
ment. Coat metal cutting attachments with cor‐
rosion inhibitor.
► Thoroughly clean the machine – pay special
attention to the cylinder fins and air filter.
► Store the machine in a dry and secure location
– out of the reach of children and other unau‐
thorized persons.
21 Sharpening Metal Cutting
Blades
► Use a sharpening file (special accessory) to
sharpen dull cutting attachments. In case of
more serious wear or nicks: Resharpen with a
grinder or have the work done by a dealer –
STIHL recommends a STIHL servicing dealer.
► Sharpen frequently, take away as little metal
as possible – two or three strokes of the file
are usually enough.
1 1
2
2
► Resharpen the teeth (1) uniformly – do not
alter the contour of the parent blade (2) in any
way.
See cutting attachment packaging for additional
sharpening instructions. Keep the packaging for
future reference.
21.1 Balancing
► After resharpening about 5 times, check the
cutting attachment for out-of-balance on a
STIHL balancer (special accessory) or have it
checked by a dealer and re-balanced as nec‐
essary – STIHL recommends a STIHL servic‐
ing dealer.
28
22 Maintaining the Mowing
22.1
► Shut off the engine.
► Lay your power tool on its back so that the cut‐
22.2
Always check the mowing head for signs of wear
1
before replacing the nylon line.
If there are signs of serious wear, replace the
complete mowing head.
2
The nylon mowing line is referred to as "nylon
line" or "line" in the following.
The mowing head is supplied with illustrated
instructions for replacing the nylon line. Keep the
instructions for the mowing head in a safe place.
► If necessary, remove the mowing head.
22.3
STIHL SuperCut
Fresh line is advanced automatically if the
remaining line is at least 6 cm (2 1/2 in) long.
The blade on the deflector trims overlong lines to
the correct length.
STIHL AutoCut
► With the engine running, hold the rotating
► Tap it on the ground once – fresh line is
Fresh line is advanced every time the mowing
head is tapped on the ground. For this reason
observe the mowing head's cutting performance
during operation. If the mowing head is tapped

21 Sharpening Metal Cutting Blades

Head
Placing power tool on the
ground
ting attachment mounting face is pointing up.
Replacing Nylon Line
WARNING
Adjusting Nylon Line
mowing head above the grass surface.
advanced and the blade on the deflector trims
it to the right length.
0458-570-8321-B