Agroshift unit
The Agroshift unit is composed of an epicyclic speed reducer and three oil-immersed multiple disc clutches
(LOW - MED - HIGH)
The unit is located between the clutch-coupled shaft and the gearbox.
The speed reducer is engaged and disengaged selectively by way of the three clutches, which are operated
electrohydraulically from a button mounted to the knob of the shift lever.
Selecting the control, the MED clutch releases as the force of the belleville discs is overcome by hydraulic pressure;
at the same time, the HIGH clutch engages, locking the planet carrier of the epicyclic train to the relative housing so
that drive is transmitted to the range input shaft with no speed reduction whatever.
Selecting the control, the MED clutch releases as the force of the belleville discs is overcome by hydraulic pressure;
at the same time, the LOW clutch engages, and the shaft carrying the sun wheel is locked to the structure of the
transmission housing. As a result, the planet carrier is made to rotate as one with the epicyclic housing and drive is
transmitted to the layshaft at a speed reduction of 0.695 (the ratio between the annulus and the sun wheel gear teeth).
Selecting the control, the Agroshift unit is isolated from hydraulic pressure altogether and the belleville discs are
able to engage the MED clutch, with the result that the shaft in mesh with the larger planet wheel is locked to the
transmission housing. This gives a reduction of 0.828, by reason of the compound ratio between the planet wheels
and the flange of the speed reducer in mesh with the range input shaft.
Fig. 1 - Range selection indicators mounted to the instrument panel.
Fig. 2 - Plate indicating selection of electro-
hydraulic control.
Technical specifications
Clutch
maker SAME - DEUTZ FAHR GROUP
number of friction discs 4 2 2
diameter of friction discs mm 129,5 129,5 129,5
overall thickness of assembled friction discs
maximum wear - 16,96 10,35
nominal 16
÷
16.2 18,15
÷
18,65 11,5
5÷
12,05
number of intermediate discs 3 +1 2 + 1 2 + 1
disc lubrication pressure bar 5 5 5
maximum pressure bar 18 18 18
piston thrust Kg 1986 1986 1986
Nm 19463 19463 19463
Oil filter
filtration capacity micron 25 25 25
Epicyclic speed reducer
- LOW 1 + (32/72) = 1,444
- MEDIUM 1 + (20x18) : (72x24) = 1,208
- HIGH 1
clutch transmission
agroshift
27
2
119
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