Electrical System; Air Filter - Grillo FD900 4WD Manual De Instrucciones

CAUTION: If problems continue after having carried out the operations described in this manual, contact an
authorized dealer. Never attempt to make difficult reparations without the necessary means and technical
knowledge.
IMPACT WITH A STONE OR SOME OTHER FOREIGN OBJECT
1) Turn off the blades
2) Lift the cutting deck
3) Turn off the engine and pull the parking brake
4) Check the blade fixing screws and the deck state
5) Please check that the foreign body has not got into the accelerator or the pipe
ELECTRICAL SYSTEM
The electrical system is protected by fuses which, if blown, cause the whole electrical system to cut out. There are
two main fuses, both of 40 A/h: one protects the whole wiring system, while the other protects the fan on the
radiator. The fuses protecting the other electrical components of the machine and the lights are located on the left
mudguard. In case of failure, once the faulty component has been located and repaired, replace the blown
fuse with one of the same rating. Never replace a fuse with another of a different rating. If the electrical
problems still persist even after having changed the fuses, contact the Authorised Service Centre. Never attempt to
carry out complex repairs without having the necessary means and technical knowledge available.
FUNCTIONING OF THE MAIN ELECTRICAL DEVICES
- A safety sensor detects if the grass catcher is in working position (fig. 32), otherwise the cutting deck does not
engage.
- A sensor is mounted on the thermostatic valve of the engine (fig. 33). It detects the coolant liquid temperature.
When the coolant liquid temperature goes over 88°C, the sensor sends a signal to the electronic control unit (fig. 34)
which starts the automatic cleaning cycle, inverting for some seconds the radiator fan rotating sense. It is possible
to carry out the cleaning cycle also manually by pushing the button on the dashboard (fig. 1 n° 24). There are four
radiator fan inversion relays (fig. 36).
- In addition, this sensor on the thermostatic valve sends a warning alarm and switches off the engine if its
temperature goes over 104°C.
A micro-switch is located on the forward pedal detecting if the pedal is in the stop position, allowing therefore
-
the starting of the machine (fig. 35, ref. A).
- A sensor is placed on the parking brake locking pedal (fig. 35, ref. C) that detects when the parking brake is
engaged, allowing the engine to keep on running even if the operator has get off the machine.
- A micro-switch is placed on the rod of the reverse gear pedal that activates the reverse gear warning buzzer
(fig. 35, ref. B).
- The differential lock electric valve (fig. 37) is placed under the load chute: when it activates, a red led goes on.
- The full grass catcher micro-switch is mounted on a moving deflector inside the grass catcher and sends the
signal to disengage the blades when the grass catcher is full (fig. 38). It is important to adjust the position of the full
grass-catcher micro-switch according to the type of the grass to be cut, to ensure an even filling of the grass-catcher
(fig. 2B).

AIR FILTER

Check and clean the air filter (fig. 10) and the pre-filter every 8 hours. The air filter is equipped with a depression
sensor that signals on the dashboard that the filter is clogged. For its replacement and the exact maintenance
intervals please follow the instructions and warnings in the engine manual. If working in a very dusty environment, it
is recommended to clean the air filter every 4 hours. Inside the air filter there is a safety cartridge to prevent
residues or impurities from getting inside the suction duct during the cleaning of the air filter. If the air filter looks
deteriorated or damaged, it has to be replaced.
DIESEL FILTER
Replace the diesel filter cartridge (fig. 39) every 250 hours. For its replacement and the exact maintenance intervals
please follow the instructions and advices in the engine manual.
Translation of the original instructions
- Faulty full grass-catcher micro-
switch
-Faulty closed grass-catcher
micro-switch
- Check the fuses
- Detach the connection under the grass-catcher
on the right side. Connect the white/red wire with
the blue/red wire.
- Connect the white/red wire with the red wire to
check the functioning of the closed grass-catcher
micro-switch
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