Grillo FD900 4WD Manuel D'utilisation page 15

WHEEL HYDRAULIC MOTORS
Check the level in the reservoir with the motors cold (fig. 4). If more oil is needed, add hydraulic oil OSO 46 (total
quantity: 9,5 litres). Carry out this control frequently. Caution! Replace both the hydraulic oil and the hydraulic filter
of the hydraulic motors after the first 500 working hours and then every 1000 working hours.
The oil has to be changed before the first 500 working hours ONLY if:
the oil is black;
-
- the oil has a whitish colour (it is contaminated with water);
- there is black coloured residue (partial oil deterioration).
To drain the oil loosen the pipe on the gear pump (fig. 22). To fill it again with fresh oil, unscrew the upper cap of the
tank (fig. 4). Pay attention to impurities, which may obstruct the circuit and damage the machine. When you change
the hydraulic oil, the oil filter must be replaced too (fig. 21). Pay attention to the filtering grade. Do not increase the
pressure of the wheel transmission hydraulic system over 280 bar because this could damage the hydraulic pump
and the hydrostatic motors.
MOWER DECK GEARBOX
Use synthetic oil LSX 75 W 90 (API GL4 + GL5; API MT1 and PG2) quantity 0,1 lt. Replace every 300 working
hours. The gearbox is equipped with a cap on the right side (fig. 23). To remove oil from the gearbox, you must
disconnect the cutter deck from the machine, remove plastic cover, put the cutter deck in vertical position and
unscrew the lid. Make sure that oil will not get on the belt. (For this kind of operation contact our service centres.) If
the operator notices oil losses, check and replace the seals to avoid damages to the whole gearbox.
Wheel closed circuit (variable displacement pump)
Hydraulic steering
Distributor
Charge pump
LUBRICATION POINTS WITH GREASE
Find the lubrication points following the scheme (fig. 2A, n°4, n°3). Lubricate with grease every 50 hours the rear
axle pivots, the pedals, the PTO transmission belt guide pulley, the pivot connected to 2 points of the cutting deck,
the grass-catcher lifting arms.
EMERGENCY AND PARKING BRAKE
The FD900 moves forward via hydraulic motors. To brake it is therefore sufficient to release the forward and reverse
gear pedals (fig. 1 n° 1 and 2). The brake pedal (fig. 1, n° 3) has to be used only in case of emergency. To engage
the parking brake, press the emergency brake (fig. 1 n° 3) and then engage the locking via the appropriate pedal
(fig. 1 n° 5). To disengage the parking brake just press again the emergency brake (fig. 1 n° 3).
Remember to always engage the parking brake, even though the machine is self-braking when the engine is off.
The engine remains on when the operator gets off the machine if the parking brake is engaged.
ADJUSTMENT OF THE PARKING BRAKE AND EMERGENCY BRAKE PEDAL
The brake adjusting screws are located under the platform (fig. 24). The drum brakes are on the front wheels, make
sure the wire does not touch the wheel.
Translation of the original instructions
HYDRAULIC PRESSURES: summary table
280 BAR
125 BAR
125 BAR. Free, hydraulic steering is
overriding.
10 BAR @ 3200 r.p.m.
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