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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 exceed 2g.
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 machine in order to prevent damaging
a part of the machine 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.
6.3.7 MOWING DECK - INSPECTION AND BALANCING
To achieve the best mowing results the mowing deck must be set at the correct mowing
height and both sides of the deck must be level. Therefore, regularly check the distances A,
B and C.
Distance A is the front edge of the mowing deck in the travel direction and it should be 23-
25 mm above the ground.
Distance B is the rear edge of the mowing deck in the travel direction and it should be 28 -32
mm above the ground, i.e. the rear edge must be 5-8 mm higher than the front edge.
Distance C represents the setting of the mowing deck in the side direction and the distance
between the left and right side should not be more than 5 mm.
Prior to starting adjustment, place the machine on an optimally even surface, inflate all
the tyres to the prescribed pressure (80 -140 Kpa, ± 10 Kpa difference between the
individual tyres) and secure the entire machine against movement (e.g using a suitable
wedge, etc.).
Release the safety pins on the mowing deck cover on the right side by sliding a screwdriver
into the groove of the pin and turning it anticlockwise. Take the cover off the machine.
Unscrew two nuts and washer from the drive belt tensioning mechanism on the mowing
deck. This will release the spring and the belt. Remove the belt from the pulley wheels.
96
6.3.7a
6.3.7b
6.3.7c
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