20 Repairing
► Unscrew screw (3) in the direction of the arrow
and remove together with washer (4).
► Remove blade (1).
► Discard screw (3) and washer (4).
Use a new screw and washer to attach
blade (1).
19.1.2
Attaching the Blade
► Switch the lawn mower off, pull out the activa‐
tion key and remove the battery.
► Upend the lawn mower.
► Lay new washer (1) on new screw (2) with the
convex side facing outwards.
► Apply Loctite 243 thread locker to the thread
of screw (2).
► Position blade (3) so that the raised areas on
contact area (4) engage in notches (5).
► Screw in screw (2) together with washer (1).
21 Troubleshooting
21.1
Remedying Lawn Mower or Battery Faults
Fault
LEDs on the
battery
The lawn mower
1 LED flashes
does not start
green.
when switched
on.
1 LED illumina‐
tes red.
0478-131-9946-D
► Block blade (1) using a piece of wood (2).
► Tighten screw (3) to 65 Nm.
19.2
Sharpening and balancing the blade correctly
requires a lot of practice.
STIHL recommends having the blade sharpened
and balanced by a STIHL specialist dealer.
■ The cutting edges of the blade are sharp. This
may result in the user cutting themselves.
► Wear work gloves made from resistant
► Switch the lawn mower off, pull out the activa‐
tion key and remove the battery.
► Upend the lawn mower.
► Remove the blade.
► Sharpen the blade. Observe the sharpening
angle and cool the blade,
Bluing of the blade during sharpening is not
permitted.
► Attach the blade.
► If anything is unclear: consult a STIHL special‐
ist dealer.
20 Repairing
20.1
The user should not repair the lawn mower or
blade themselves.
► If the lawn mower or blade is damaged: do not
use the lawn mower or blade and consult a
STIHL specialist dealer.
► If warning signs are illegible or damaged: have
the warning signs replaced by a STIHL spe‐
cialist dealer.
Cause
The battery charge
state is too low.
The battery is too
warm or too cold.
Sharpening and Balancing the
Blade
WARNING
material.
Repairing the Lawn Mower
Remedy
► Charge the battery.
► Pull out the activation key.
► Remove the battery.
► Allow the battery to cool down or warm
up.
English
22.2.
39