10-13
1.
BOOST PUMP
FUNCTION
·
The rotary movement and torque transmitted to the pump shaft are converted into hydraulic energy and the pres-
surised oil flow is sent to the variable displacement pump and for lubrication of the gearbox secondary shaft.
OPERATION
·
The boost pump (1) draws oil from the rear gearbox and sends it under pressure to the filter (2) and to the variable di-
splacement pump (3).
·
The pressurised oil is also used for lubrication of the secondary shaft (4).
·
The pressure generated by the boost pump is controlled by the pressure limiting valve (5) (setting 15 bar (21.7 psi))
which prevents excessive pressure in the lubrication circuit when the tractor is started from cold.
·
The boost circuit is also equipped with a filter by-pass valve (6) (setting 3.5 bar (50.7 psi)) which excludes the filter (2)
from the circuit when its is clogged .
In this event, the filter clogging sensor (7) illuminates the warning light to alert the operator.
D0003580
1
2
3
4
5
6
7
REAR GEARBOX
FRONT GEARBOX
BOOST PUMP