Viking MA 339 Manual De Instrucciones página 49

● Tilt lawn mower upwards and set down
on lower handlebars (3).
Notes on cleaning:
● Clean off dirt using little water, with a
brush or with a cloth. In particular, also
clean the mowing blade. Never spray
water on motor components, seals,
bearing points or electrical components
such as batteries or switches.
● First, remove accumulated clipping
deposits using a stick.
● Remove dirt from the cooling air guide
(inlet slots) between the motor hood
and the lower housing to ensure that
the motor is adequately cooled.
● If necessary, use a special cleaner
(e.g. STIHL special cleaner).
13.3 Electric motor and wheels
The electric motor is maintenance-free.
The wheel bearings are maintenance-free.
13.4 Battery
Maintenance interval:
Before each use
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
Ensure that the cooling air slots are free of
dirt. In addition, observe the instruction
manual for the charger.
0478 131 9926 B - EN
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 the
average. A worn blade may break
off and cause serious injuries. The
instructions for blade maintenance
must therefore always be observed.
● Tilt mower upwards into cleaning
position ( 13.2).
● Clean mowing blade (1).
● Use a slide calliper (2) to measure
blade thickness at 5 points at least. In
particular, minimum thickness must
also be ensured in the area of the blade
wings.
● Place a ruler (3) against the front blade
edge and measure permissible
grinding.
Wear limits:
Blade thickness: > 1,6 mm
Permissible grinding: < 5 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.
If the mulching blade available as a special
accessory is installed on the lawn mower,
different wear limits apply (see instruction
23
manual for accessory).
13.7 Removing and installing
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
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).
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