Balancing The Blades; Replacing Blades - EMAK EF 92S/13H Manual Del Usuario

 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.
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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 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.
- 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
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
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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
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deck. This will release the spring and the belt. Remove the belt from the pulley wheels.
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6.3.7a
6.3.7b
6.3.7c