Cleaning The Machine; Blade Maintenance - Viking GB 370 S Instruction Manual

11.2 Cleaning the machine

Maintenance interval:
After each use
Clean the machine thoroughly each time it
has been used. Care of the machine will
protect it against damage and extend its
service life.
Cleaning position of the garden
shredder:
It is only permitted to clean the machine in
the position shown.
● Remove the feed chute. (
The machine (engine) may be damaged if
the garden shredder is not positioned as
described.
Never spray water onto
motor or engine components,
seals, bearing points or
electrical parts such as
switches. This would result in
expensive repairs.
If you are unable to remove
the dirt and accumulated
deposits with a brush, a damp
cloth or a stick, VIKING
recommends the use of a
special cleaner (e.g. STIHL
special cleaner).
Do not use aggressive cleaning agents.
Clean the blade discs regularly.
Remove dirt from the cooling ribs, fan
wheel, area around the air filter, exhaust,
etc. to ensure that the engine is
adequately cooled.
0478 216 9901 B - EN

11.3 Blade maintenance

17
Risk of injury!
Always wear thick
gloves.
Maintenance interval:
Before each use
● Remove the feed chute. (
● Check the blades for damage (notches
or cracks) and wear; reverse or replace
if necessary.
Wear limits of the blades:
7.8)
The blades must be reversed or
replaced before the specified wear
limits are reached. VIKING
recommends VIKING specialist
dealers.
● On the blades, measure the distance
between the bore to the edge of the
blade at several points.
Minimum distance 6 mm
Reversing the blades:
The cutting blades are designed as
reversible blades. This means that
blunt blades can be reversed and
the machine is ready for use again.
Always reverse both blades.
● Remove the blade disc. (
● Unscrew screws (1) and remove
together with nuts (2).
● Remove blade (3) upwards.
● Clean the blade disc.
● Reverse blade (3) and place onto the
blade disc with the sharp edge exposed
and align the bores.
● Insert screws (1) through the bores and
screw on nuts (2). Tighten nuts (2) to
22 - -28 Nm.
18
● Install the blade disc. (
Sharpening the blades:
Blades which are blunt on both sides must
be sharpened before resuming work.
In order to ensure optimum machine
operation, the blades should only be
7.8)
sharpened by a technician. VIKING
recommends VIKING specialist dealers.
● Remove the blades for sharpening.
● Cool the blades 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.
● Check blades for damage before
installing: The blades must be replaced
if notches or cracks are visible or if the
blades have reached the wear limits.
● Sharpen blades at a sharpening angle
of 30°.
● Sharpen the blades against the cutting
edge.
● After sharpening, remove any
sharpening burr at the cutting edge
using fine sandpaper.
7.6)
● Observe the tightening torques
contained in the "Reversing the blades"
section when installing the blades.
7.5)
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