Checking Blade Wear; Removing And Installing Mowing Blade; Sharpening The Mowing Blade; Storage (Winter Break) - Stihl RMA 339 C Gebrauchsanleitung

● Clean the charger with a damp cloth.
● Clean the electric contacts in the
charger with a paintbrush or a soft
brush.
● Observe the instructions in the charger
instruction manual.

13.6 Checking blade wear

Maintenance interval:
Before each use
Risk of injury!
Blades are subjected to differing
degrees of wear depending on the
location and duration of use. If you
use the machine on sandy ground
or use it frequently under dry
conditions, the blade will be
subjected to greater loads and will
wear more quickly than average. A
worn blade may break off and
cause serious injuries. The
instructions for blade maintenance
must therefore always be observed.
● Set the lawn mower onto its back into
cleaning position. ( 13.2)
● Clean the mowing blade (1).
● Use a slide calliper to measure the
blade thickness A at 5 points at least.
In particular, minimum thickness must
also be ensured in the area of the blade
wings.
● Check the blade width B in the area
marked in grey X at least 3 points
using a slide calliper.
Wear limits:
Blade thickness A: 1,6 mm
Blade width B: 56 mm
The blade must be replaced,
0478 131 9927 B - EN
– if it is damaged (notches, cracks),
– if the measured values are achieved at
one or more points or are outside the
permissible limits.
13.7 Removing and installing
mowing blade
In order to prevent damage to the
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blade fastening screw, use a
suitable socket (22 mm) for
loosening and tightening.
1 Removing:
● Use a suitable wooden block (1) to
counterhold mowing blade (2).
● Unscrew blade fastening screw (3) and
remove mowing blade (2).
2 Installing:
Risk of injury!
The mowing blade must only be
installed as shown, in particular
tabs (6) must face downwards.
Always replace blade fastening
screw (3) when replacing the
mowing blade. The specified torque
when tightening the blade fastening
screw must be strictly observed, as
the secure attachment of the cutting
tool depends on this.
● Clean the blade contact surface and
blade bushing.
● Install mowing blade (2) with curved
wings pointing upwards. Locating
lugs (4) must be located in recesses (5)
of mowing blade.
● Use a suitable wooden block (1) to
counterhold mowing blade (2).
● Apply Loctite 243 to thread of blade
fastening screw (3).
● Tighten blade fastening screw (3).
Tightening torque:
10 - 15 Nm

13.8 Sharpening the mowing blade

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If you do not have the necessary expertise
or auxiliary equipment, you should have
the blade sharpened by a specialist dealer
(STIHL recommends STIHL specialist
dealers).
Operation of the machine is impaired in the
case of an incorrectly sharpened mowing
blade (incorrect sharpening angle,
imbalance, etc.), the cutting performance
(battery running time) may be reduced and
the noise emissions increased.
Sharpening instructions
● Remove the mowing blade. (
● Cool the mowing blade during
sharpening, e.g. with water.
The blade must not be allowed to
display blue colouring, as this would
reduce its cutting quality.
● Sharpen blades evenly to prevent
vibration due to imbalance.
● Observe a sharpening angle of 30°.
● Observe the wear limits. (

13.9 Storage (winter break)

Store the machine in a dry and locked
place that is generally free of dust. Make
sure that it is kept out of the reach of
children.
13.7)
13.6)
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