Viking MA 443 [56/337] Removing and installing the mowing blade
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Viking MA 443 [56/337] Removing and installing the mowing blade

Viking MA 443 [56/337] Removing and installing the mowing blade
0478 131 9922 C - EN
54
Wear limits:
Distance A:
The cutting edges may not be ground back
by more than 15mm.
Distance B:
The minimum width of the mowing blade
must not be less than 39 mm.
Distance C:
The blade thickness must be at least
2mm at any point.
The check should be performed using a
slide calliper.
If the supplied standard blade is not
installed in the lawn mower, but e.g. the
multi-blade, which is available as a special
accessory, different wear limits apply.
13.7 Removing and installing the
mowing blade
1 Removing:
● Use a suitable wooden block (1) to
counterhold the mowing blade (2).
● Tighten the blade fastening screw (3).
Remove the mowing blade (2) and
blade fastening screw (3).
2 Installing:
● Clean the blade contact surface and
blade bushing.
● Fit the mowing blade (2) onto the blade
bushing with the curved edges pointing
upwards. Locating lugs (4) must be
located in bores (5) of the mowing
blade.
● Use a suitable wooden block (1) to
counterhold the mowing blade (2).
● Screw in the blade fastening screw (3)
and tighten to a torque of 10 - 15Nm.
13.8 Sharpening the mowing blade
VIKING recommends having the mowing
blade sharpened by a technician.
Operation of the machine is impaired in the
case of an incorrectly sharpened blade
(incorrect sharpening angle, imbalance
etc.).
Sharpening instructions:
● Remove the mowing blade (Ö 13.7).
● Cool the mowing blade when
sharpening, e.g. with water. The blade
must not be allowed to display blue
colouring, as this would reduce its
cutting quality.
● Sharpen the blade evenly to prevent
vibrations due to imbalance.
● Observe a sharpening angle of 30°.
● After sharpening, remove any
sharpening burr at the cutting edge
using fine sandpaper if necessary.
Risk of injury!
A worn or damaged mowing blade
may break off and cause serious
injuries. The instructions for blade
maintenance must therefore always
be observed.
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.
In order to prevent damage to the
blade fastening screw, use a
suitable 22 mm hexagon socket
(not included in standard
equipment).
Risk of injury!
The mowing blade (2) must only be
installed as shown. The tabs (6)
must face downwards (to the lawn)
and the curved wings must point
upwards (to the machine).
Observe the specified torque of
10 - 15Nm when tightening the
blade fastening screw, as the
secure attachment of the cutting
tool depends on this. Additionally
secure the blade fastening
screw (3) with Loctite 243.
The blade fastening screw (3) must
be replaced each time the blade is
replaced.
24
Risk of injury!
Check the blade for damage before
installing. The blade must be
replaced if notches or cracks are
identified, if the cutting edges have
been sharpened back by more than
15 mm, or if the blade is thinner
than 2 mm at any point (Ö 13.6).

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