FD450/ Translation of the original instructions
IMPORTANT: this operation has to be carried out in a clean environment to prevent
impurities or ground residues from entering the hydrostatic axle and causing damage.
Therefore, we recommend the replacement of oil into the hydrostatic axle to be carried out
only by a Grillo authorised service centre.
HYDRAULIC CIRCUIT
Frequently check the hydraulic oil level in the tank when the engine is cold and the grass-catcher is
closed. Use OSO 46 hydraulic oil, total amount of 3,5 litres.
IMPORTANT: Replace the hydraulic oil after the first 500 working hours then every 1000 hours. To
drain the oil use the appropriate drain plug (fig. 14, C).
Replace the oil before 500 working hours only if:
- the oil is black
- the oil has a whitish colour (it has been contaminated with water);
- there are black residues (partial oil deterioration).
REAR WHEEL AXLE
Grease the rear wheel pivot pins every 20 hours (fig. 41, A).
DIFFERENTIAL LOCK
To engage the differential lock, press the pedal (fig. 1, n.2). Adjust the control cable and lever so
that the differential lock can be correctly engaged and disengaged (fig. 9). When releasing the
pedal, the differential lock must disengage. Do not use the differential lock when changing direction
because the differential lock components could be strained.
SHARPENING THE BLADES
A blunt blade pulls at the grass, giving it an unsightly appearance. The cutting edges of both
blades must therefore always be kept sharp and worn blades must be replaced. To sharpen the
blades first remove the mower deck (fig. 26) then follow the instructions below:
1) Position the mower deck in its lowest cutting position.
2) Remove the protection guard above the deck by unscrewing both wing nuts (fig. 25).
3) Remove the pin (fig. 25, A).
4) Turn the lever anti-clockwise (fig. 25, B).
5) Remove the PTO belt (fig. 25, C).
6) Detach the wire of the electric wire (fig. 25, F).
7) Release the fork (fig. 31, B), pull the deck forward and set it vertical (fig. 26). It is recommended
to open the grass catcher and take off the discharge chute. (fig. 32, A).
Worn blades lose their cutting efficiency and tend to become unbalanced, causing the mower to
vibrate. If the unbalance persists even after sharpening, check the balance by inserting a
screwdriver in the hole in the centre of the blade and hold up, grind the blade until it remains
horizontal and is therefore balanced. To remove a blade, take hold of it firmly, wearing safety
gloves, and undo the centre bolt (IMPORTANT: the right hand blade bolt has a left thread).
CAUTION!
Always replace damaged or worn-out blades; never attempt to repair them! ALWAYS USE
ORIGINAL BLADES!
CAUTION!
In order to reassemble the cutting deck, you have to fit together the cutting deck lead (fig.23, A)
with the one which is located on the machine, between the wheels, in the centre.
LUBRICATION WITH GREASE
Follow the lubrications points scheme (fig. 41A – 41B). Lubricate with grease every 40 hours the
rear axle joints, pedals and the grass-catcher lifting arms.
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