Case 580SR Service Manual page 180

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114
THE RANGE CLUTCHES
Once a directional clutch is engaged power is trans-
mitted to the range clutches (1st or 2nd).
Operation and actuation of the range clutches is
similar as the directional clutches.
The engagement of the range clutches is also mod-
ulated to enable a smooth engagement.
The modulation of these clutches is achieved by
means of a restrictor valve fitted in the control valve
and controlled electronically. It also limits the oil flow
to the clutch during shifts.
In the clutch itself the plate before the end plates is
dished to build up the clamping force of the clutch
gradually.
THE OUTPUT SECTION
With a range clutch engaged power is finally trans-
mitted to the output shafts.
The transmission can have an upper output or lower
output at the rear side of the unit, and a lower output
at the front side. The rotation of the rear upper output
is opposite to the engine rotation when forward trav-
el is selected. The rotation of the rear lower output
and of the front output is the same as the engine ro-
tation when forward travel is selected.
Ratio between upper and lower output is 0.951:1.
The lower front output has an axle disconnect clutch
to enable 4WD.
The clutch is similar as the other clutches except that
it has no modulation.
The disconnect is controlled electronically. Without
an electrical signal the clutch is always engaged.
SECTION 21 - TRANSMISSION
The range clutches
The output section
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