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41
DEFRNLITESPTNOSVFIDAPLHUHRLV EN
0478 111 9924 C - EN
Use a slide calliper (A) to measure the
blade thickness (A) at several points.
Measure the permissible grinding (B).
Place a ruler (3) against the front blade
edge as shown for this purpose.
Wear limits
The blade thickness (A) must be at least
2.5 mm at any point. The most important
points are marked in the illustration.
The cutting edges must not be ground
back by more than 5mm - distance (B)
(permissible grinding) during sharpening.
12.3 Sharpening the mowing blade
If you do not have the necessary expertise
or auxiliary equipment, we recommend
that you have the blade sharpened by a
specialist dealer. 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 12.4)
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 (Ö 12.2).
12.4 Removing and installing
mowing blade
Removing
Hold the mowing blade (1) and loosen
the blade fastening screw (2).
Remove the blade fastening screw (2),
retaining washer (3) and mowing
blade (1).
Assembly
Clean the blade contact surface and
blade bushing (4).
Secure the blade fastening screw (2)
with Loctite 243.
Fit the mowing blade (1) onto the blade
bushing (4) as shown.
MB 4 RTP: Make sure that the thrust
washer (5) is positioned correctly.
Position the retaining washer (3) as
shown and tighten with the blade
fastening screw (2) to 60 - 65 Nm.
12.5 Engine
Maintenance interval:
See engine instruction manual.
General information:
Observe the operating and maintenance
instructions contained in the attached
engine instruction manual.
To achieve a long service life, it is always
particularly important to maintain a
sufficient level of oil and to change the oil
and air filter regularly.
The recommended oil change intervals as
well as information on engine oil and oil
capacities can also be found in the engine
instruction manual.
The cooling ribs must always be kept clean
to ensure that the engine is adequately
cooled.
12.6 Storage (winter break)
Note the following points when storing the
machine for long periods (winter break):
Clean all external parts of the machine
with care.
Thoroughly lubricate/grease all moving
parts.
Risk of injury!
Observe the safety instructions in
the "For your safety" section.
(Ö 4.7)
Risk of injury!
Always wear gloves.
The mowing blade must be
replaced if notches or cracks are
detected or if a wear limit is
reached (Ö 12.2).
21
Risk of injury!
The prescribed tightening torque
for the blade fastening screw must
be observed.
The retaining washer (3) must be
replaced each time the blade is
installed.
The blade fastening screw (2) must
be replaced each time the blade is
replaced.
43


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