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Sharpening procedure:
Remove the grass catcher, tilt the machine on to the right side and prop it up using suitable supports. It is recommended
to invite another person to help with tilting the mower in order to prevent damaging a part of the mower or an injury.
Unscrew both blades and clean them.
6.3.6a
First sharpen with a grinder and then with a file.
Do not sharpen directly on the mowing deck.
After sharpening the blades, do not install them yet, but check their balance, see procedure below.
Prior to reinstalling the blades, check the condition of the break pins which serve as protection of the mowing deck.
If the break pins are damaged, replace them immediately. Spare pins are supplied with the mower.
6.3.6b
After checking the balance and the brake pins, screw the blades back in position. During installation, ensure that the bend of the
blades points upwards into the mowing deck body. Do not interchange the left and right blades. The right blade has a bolt with a left
thread.
Carefully tighten the fastening bolts using a torque wrench using the prescribed tightening torque of 30 ± 3 Nm. This torque is
achieved the moment when the tangential (convex) spring under the fastening bolt is fully compressed and from this point on the
bolt is not tightened.
BALANCING THE BLADES
Pay increased attention to levelling and balancing the blades. The vibration of blades that are not levelled and balanced may damage
the engine or the mowing deck.
When balancing, insert the screwdriver into the centring hole and set the blade
into a horizontal position. If the blade remains in this position, it is balanced.
If one of the ends is weighs down, grind this side until it is balanced. When
balancing by grinding, do not shorten the length of the blade! The permitted
static imbalance may not be greater than 2 g.
If you are not certain about the procedure, please contact an authorised service centre, where they will gladly provide
advice.
REPLACING BLADES
If due to frequent use the blades are damaged, they cannot be balanced or sharpened properly, it is necessary to replace them.
Proceed as follows:
Remove the grass catcher, tilt the machine on to the right side and prop it up using suitable supports. It is recommended to invite
another person to help with tilting the mower in order to prevent damaging a part of the mower or an injury.
Screw out both blades.
Prior to installing new blades, check the condition of the brake pins which serve as protection of the mowing deck. If the break pins
are damaged, replace them immediately.
Check that the blades are balanced, see above.
Screw on the new blades. During installation, ensure that the bend of the blades points upwards into the mowing deck body. Do not
interchange the left and right blades. The right blade has a bolt with a left thread.
Carefully tighten the fastening bolts using a torque wrench using the prescribed tightening torque of 30 ± 3 Nm. This torque is
achieved the moment when the tangential (convex) spring under the fastening bolt is fully compressed and from this point on the
bolt is not tightened.
When the blades impact a solid obstacle, immediately stop the engine and check the blades! The break pins may be
damaged or broken.
Whenever handling the mowing blades, always use heavy-duty work gloves.
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