Balancing The Blades; Replacing Blades - EMAK STARJET AJ102 Manual De Usuario

Before reinstalling the blades, check the shear pins that protect the mowing mechanism
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from damage. If the shear pins are damaged, replace them immediately. Replacement pins
come with the machine.
After checking the balance and the shear pins, bolt the blades back on. When installing, make sure
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the blades to not face upward inside the mowing mechanism cover. Do not switch the left one with the
right one. The right blade has leftward threads.
Carefully tighten the blades' mounting bolts using a torque wrench set to ±3 Nm. This torque is
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reached at exactly the moment when the tangential spring under a blade's mounting bolt is completely
compressed. After that, do not tighten the screw further.

 BALANCING THE BLADES

Use great care when aligning and balancing the blades. Vibration from misaligned and unbalanced
blades can damage the engine or mowing mechanism.
When balancing, insert a screwdriver into the centring hole
and place the blade in horizontal position. If the blade stays
in this position, it is balanced. If one of the ends of the blade
is heavier, grind this side until it is balanced. When grinding
for balance, do not shorten the blade! The maximum static
balance is 2 g.
If you are not sure of the procedure, contact your authorized service centre, where they will
gladly advise you.

 REPLACING BLADES

If the blades have been damaged by frequent use, they cannot be properly sharpened and must be
replaced. Proceed as follows:
Remove the grass catcher, tilt the machine to the right side, and place appropriate pads under it. We
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recommend having another person help, in order to avoid injury and damage to the machine.
Unbolt both blades. If the machine is equipped with TRIPLEX blades, remove each blade from the
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holder.
Before installing the new blades, check the shear pins that protect the mowing mechanism from
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damage. If the shear pins are damaged, replace them immediately.
Check the new blades' balance. See above.
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Bolt the new blades on. When installing, make sure the blades do not face upward inside the mowing
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mechanism cover. Do not switch the left one with the right one. The right blade has leftward threads.
Carefully tighten the blades' mounting bolts (applicable to machine types AJ102, AJ102 4x4
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and AG122) using a torque wrench set to ±3 Nm. This torque is reached at exactly the moment when
the tangential spring under a blade's mounting bolt is completely compressed. After that, do not
tighten the screw further.
In the case of machine of type AJ110, the screws are tightened with current tightening moments
M8 – 24 Nm, M10 – 48 Nm.
- As soon as the blades meet a hard object, stop the engine immediately and check
them! The shear pins may be damaged or severed.
- Whenever handling the blades, wear solid work gloves.
6.3.7 MOWING MECHANISM - INSPECTION AND BALANCING
For best mowing results, the mowing mechanism must be set to the correct height from the ground, and
each side of the mechanism must be level.
Before adjustment:
Place the machine on a perfectly level surface, inflate all tyres to the rated pressure (80 - 140 kPa,
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± 10 kPa between the individual tyres) and secure the whole machine against movement (e.g.,
with an appropriate wedge, etc.).
Set the mowing mechanism height lever to position 2.
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6.3.6b