Grillo FD900 4WD Manuel D'utilisation page 16

Translation of the original instructions
SHARPENING THE BLADES
To sharpen the blades follow the procedure below:
1) set the cutting deck at the lowest cutting position
2) raise the grass-catcher and remove the load chute between cutting deck and grass-catcher.
3) raise the cutting deck and remove the side pivots (fig. 1, n. 10).
4) Hold the bar on the cutting deck, lean the feet against the bracket and hook the cutting deck (fig. 25). There is
no need to dismount the cardan joint. However before starting the machine, make sure that the cardan joint is well
connected and that the stop push button is protruding.
IMPORTANT: the central screw fixing the right blade disc has a left-hand thread. The tightening torque of the
central screw of the blade hub is 53 Nm (assembling scheme – fig. 26) while the screws fixing the blades have a
tightening torque of 50 Nm. To make replacement of the blades easier, remove the whole disc.
A blunt blade pulls at the grass giving it an unsightly appearance, the cutting edges of the blades must therefore be
kept sharp at all times. As the blades wear they lose their cutting efficiency and tend to become unbalanced,
causing the mower to vibrate; sharpen both blades uniformly. Caution: Always replace damaged or crooked
blades, never try to repair them!
CUTTING DECK ADJUSTMENT
An even deck is essential for achieving a uniform cut over the whole lawn. With the mower on a flat surface, check
the tyre pressures, check the distance of the cutting deck edge from the ground and act on the tie rods (fig. 27, A)
and on the adjusting screw (fig. 27, B) to put it parallel to the ground. If a satisfactory parallel set up cannot be
achieved, contact an authorized dealer.
To dismount the cutting deck follow the procedure below:
1) Raise the grass-catcher and remove the load chute.
2) Unscrew the locking screw of the cardan joint cover and unhook the cardan joint pushing on the lock button.
3) Remove the pins from the lifting arm pivots and remove these pivots.
4) Unhook the rear hooks for the cutting deck maintenance.
5) Detach the four hydraulic pipes.
6) Pull the cutting deck forward to remove it from the machine.
To mount the cutting deck again follow the same procedure from the last point to the first. Should it be complicated
to reconnect the hydraulic pipes for the cutting deck automatic cleansing, move the lever for the grass-catcher tilting
a couple of times back and forth, to discharge the oil pressure inside the pipes.
PTO BELTS
Attention: These belts are special, USE ORIGINAL BELTS.
To replace them, loosen the tie rod (fig. 6) and remove the arm fixed through two screws to the right bracket of the
engine (fig. 28). Unhook the anti-vibration spring of the clutch and the clutch electric wire. To adjust the tension use
a no. 13 spanner on the tensioning spring (fig. 5. n° A). The spring must be compressed at the length indicated by
the red arrow (fig. 6).
ADJUSTMENT OF THE GRASS CATCHER – LOAD CHUTE ALIGNMENT
To achieve best results it is important to have a perfect alignment between the grass catcher and the load chute
when the grass catcher is closed. Follow the points below:
1) Put the grass-catcher in closed position.
2) Shorten or lengthen the rod of the side hydraulic cylinders (fig. 29) for the tilting of the grass-catcher. This
operation can be carried out by unscrewing or screwing the screw set at the bottom of the cylinders rod.
3) This adjustment can also be carried out via the screws fixing the grass-catcher in the rear part (fig. 30).
GRASS CATCHER LOCKING HOOK
The grass catcher locking hook is adjusted via the appropriate screw (fig. 31). Please leave a 2 mm clearance to
make the hooking easier when closing.
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