4.8
Sharpening and balancing of the blades
Blunt blades damage the lawn, cause yellowing and result in
less efficient mowing. When blades are incorrectly balanced,
they cause serious vibrations during mowing.
·
Always use 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:
1. The screw for the left blade [1a] has a left-hand thread and
is unscrewed in a clockwise direction
2. The screw for the right blade [1b] has a right-hand thread
and is unscrewed in an anti-clockwise direction.
a. Sharpening
1. Both cutting edges of a blade must always be sharpened
on the bevelled side only and no further than the 10 mm
maximum blade wear level [2].
b. Balancing
1. Check the balance using the appropriate equipment until
there is a maximum difference of 2 grammes between one
side and the other.
·
During fitting, make sure that the blade vanes are
directed towards the inside of the plate and that the
concave section of the spring washer [3] is bearing on
the blade.
Tightening torque
[1a]
Left blade fastening screw
45 ¸ 50 Nm
[1b]
Right blade fastening screw
45 ¸ 50 Nm
!
WARNING :
!
WARNING :
60
