23
HYDRAUlIC PRESSURES
Closed circuit transmission:
variable displacement pump and hydraulic motor
200 bar
Power steering
140 bar
Lever distributor
140 bar
Hydraulic pump loading pressure
5 bar
16.4
Maintenance
and complete disassembly of the mower deck
CAUTION
: carry out this operation with the engine switched
off and the brake applied.
Proceed as follows to remove the mower deck:
1. Lower the cutting deck by moving the distributor lever to the FLOAT
position (ig.59/1).
2.
Unscrew the cardan shaft guard screw (ig.63) and release the
cardan shaft by pressing the locking button (ig.64).
ig. 63
ig. 64
3. Release the rear arm pins by pulling them outwards and turning
them to lock the pin in the slot (Fig. 65).
ig. 65
4.
Remove the split pins (ig. 66/A) from the pins of the plate lift arms
and slide out the pins (ig. 66/B).
ig. 66
A
B
5. Disconnect the electrical wire of the motor that controls the cutting
height of the cutting deck (Fig. 67).
ig. 59
3
1
2
Check the level in the hydraulic oil tank periodically, when the oil is cold.
To check or top up the oil level, unscrew the oil level plug (ig. 60). Check
the level by means of the dipstick on the oil iller cap: the level must lie
between the two notches at the end of the dipstick. Check the level by
screwing the cap on and off completely each time. To remove the oil,
unscrew the hydraulic hose on the gear pump (ig. 61).
Change the hydraulic oil and oil ilter (Fig. 62) the irst time after 100
hours, then every 400 hours. It is not necessary to bleed the hydraulic
system. Pay attention to the degree of iltration of the ilter (10 μm).
The oil must be changed before 100 hours if:
- the oil is dark in colour;
- the oil is whitish in colour (oil is contaminated with water);
- there are black residues (partial deterioration of the oil).
Use hydraulic oil 5W50 in a quantity of 6.7 litres including illing the circuit
and the ilter.
IMPORTANT
: take particular care with any impurities that may
end up in the circuit and cause serious damage to the machine.
ig. 60
ig. 61
ig. 62
