4.10 SHARPENING AND BALANCING OF THE
BLADES
A badly sharpened blade causes grass to become
yellow and reduces grass collection capability. If
not balanced, excessive vibration can be caused
during use.
Always wear protective gloves when handling
the blades and protect eyes when sharpening.
For removing a blade it must be firmly held and the
central screw
(1)
undone, bearing in mind that:
– the screw on the left blade
(1a)
is unscrewed anti-
clockwise
– the screw on the right blade
(1b)
is unscrewed
clockwise.
A) Sharpening
Always sharpen both cutting edges of the blade
(2)
using a medium grade grinder. Sharpening must only
be done from the rounded side, removing as little
material as possible.
The blade is to be replaced when the cutting edge
has worn down to 10 mm.
B) Balancing
Using the appropriate equipment, check the balance
to make sure that there is a maximum difference of 2
grams between one side and the other.
On reassembly, be sure to position the right and left
blades correctly, as well as that the splines
(3)
are cor-
rectly positioned on the shafts, the wings on the
blades are turned towards the inside of the deck and
that the concave part of the spring disc
(4)
is pressing
against the blade.
Tightening torques
1a
Screw for left blade ....................... 45 ÷ 50 Nm
1b
Screw for right blade ..................... 45 ÷ 50 Nm
1b
1a
4
2
4
2
3
2
4
1a - 1b
3/2003
2
2
max 10 mm
2
2
1b
1a
102 - 122
4.10
.
1
- SHARPENING AND BALANCING OF THE
BLADES
1 / 1
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2000
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••••
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