Battery; Charger; Checking Blade Wear; Maintenance Interval - Stihl RMA 443 Gebrauchsanleitung

13.4 Battery

Maintenance interval:

Before each use
● Clean the battery with a damp cloth.
● Visually check that the battery is
undamaged. Batteries with identifiable
damage (e.g. cracks or escaping fluid),
must not be used.

13.5 Charger

Maintenance interval:
Before each use
Check electric cable for damage and
ensure that cooling air slots are free of dirt.

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).
56
● 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: > 2 mm
Blade width B: > 55 mm
The blade must be replaced,
– 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
25
mowing blade
In order to prevent damage to the
blade fastening screw, use a
suitable socket (22 mm) for
loosening and tightening.
1 Removing:
● Use a suitable wooden block (1) to hold
the mowing blade (2) in place.
● 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 (7) must point downwards.
Retaining washer (4) must be
replaced each time a blade is
installed. The blade fastening
screw (3) must be replaced each
time the blade is replaced. 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.
● Place mowing blade (2) on the blade
bushing as shown. Locating lugs (5)
must be located in recesses (6) of
mowing blade.
26
● Use a suitable wooden block (1) to hold
the mowing blade (2) in place.
● Apply Loctite 243 to thread of blade
fastening screw (3).
● Place retaining washer (4) with the
convex side facing the blade and
tighten with the blade fastening
screw (3).
Tightening torque:
60 - 65 Nm

13.8 Sharpening the mowing blade

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).
0478 131 9940 B - EN