N...92
WORKSHOP MANUAL
REMOVING, SHARPENING AND BALANCING
THE BLADES
4.9
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page
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2007
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© by GLOBAL GARDEN PRODUCTS
4.9 REMOVING, SHARPENING AND BALANC-
ING 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.
A) Removing and reassembling
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.
On assembly, be careful to:
– correctly position the keys
(3)
on the shafts;
– correctly locate the right and left blades, with the
fins facing towards the inside of the plate;
– fit the flexible disc
(4)
so that the concave part is
pressing against the knife;
– tighten the screws
(1 – 1a)
with a torque wrench
set to 45-50 Nm.
B) Sharpening and balancing
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 as possible.
The blade is to be replaced when the cutting edge
has worn down to 10 mm.
Using the appropriate equipment, check the bal-
ance to make sure that there is a maximum differ-
ence of 2 grams between one side and the other.
Tightening torques
1a
Screw for left blade ...................... 45 ÷ 50 Nm
1b
Screw for right blade .................... 45 ÷ 50 Nm
2
4/2007
2
max 10 mm
2
2
3
2
4
1a - 1b
1a
1b
1a
2
1b
2
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Summary of Contents for N 92 Hydro Series
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