REFERRING TO FIGURE 1:
A - Maximum hydrostatic power steering pressure (see page 320).
B - Oil pressure in electrohydraulic control circuits for - P.T.O. - 4WD - Differential lock - H-M-L shift (see page 294).
C - Rear P.T.O. clutch engage pressure (see pages 173 - 175).
D - Rear P.T.O. brake apply pressure (see pages 173 - 175).
E - Relief pressure setting for auxiliary spool valves - front and rear lift (see pages 248 - 273 - 388).
F - Auxiliary spool valves operating pressure and kickout setting (see page 388).
G
- Hydraulic lift operating pressure for machines with assistor cylinders (see pages 248 - 273).
H - Transmission lubrication pressure (see page 320).
I - Front lift operating pressure (see pages 282 - 283).
L - Front P.T.O. pressures (see pages 286 - 287).
M - Hydraulic lift operating pressure for machines without assistor cylinders (see pages 248 - 273).
Oil filters
The oil filters are mounted to the left hand side of the transmission at the rear end, and are easily replaced; before
removal, however, some 15 litres of oil must be drained from the transmission housing so as to bring the level below
the position of the filter cannister and prevent spillage.
Filters must be replaced whenever the blockage indicator lights up at the instrument panel.
The filter blockage pressure switch is set at 0.5 bar, and must be replaced with another of identical specifications if
faulty. Ensure that the replacement is stamped with the correct 0.5 bar setting.
Whenever the transmission is stripped down for servicing or overhaul, clean the mesh strainer fitted to the bottom of
the housing.
CAUTION - Operate the lift system and auxiliary spool valves only when the blockage indicator is no longer alight.
IMPORTANT - If during normal operation of the machine the "SERVICE" indicator should light up, switch off the engine
immediately and proceed to locate the trouble.
Hydraulic pumps
The hydraulic pumps require no servicing or adjustment even after a long period of operation, although the splines of
the pump shaft must be inspected with care: there must be no signs of wear or damage.
Checking the relief valves of the hydraulic lift system
Using tool 5.9030.520.4, check that the circuit pressure relief valve incorporated into the auxiliary spool valves is set
at 190 bar and the system pressure shock valve at 210 bar.
Remember that for the lift to function correctly, operating pressure in the circuit should not exceed 150 bar.
The operating pressure can be measured by coupling a gauge to the oil pressure line between the directional control
valve and the lift; for machines with assistor cylinders, the gauge can be coupled to the pressure line connecting with
the assistors.
systems
hydraulic system
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