Case 580SR Service Manual page 85

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SECTION 21 - TRANSMISSION 19
1.7 TRANSMISSION POWER FLOW
When neutral is selected on the powershuttle lever
(1), the transmission forward (3) and reverse hydrau-
lic clutch packs or (4) are free to rotate and hence
there is no drive in the transmission.
With forward or reverse selected on the powershuttle
lever (1) power will be directed through the clutch
packs (3) or (4) to the gear train and selection of gear
on lever (2) will result in engagement of gears to the
output shafts.
Power for all four forward gear ratios is transmitted
from the front hydraulic clutch (3) on the input shaft.
The input shaft then transmits power to the counter
shaft forward gear and the countershaft in turn trans-
mits power to the output shaft.
Power flow for all four reverse gear ratios is the same
as for all four forward gear ratios except that the rear
clutch (4) is engaged to transmit power to the reverse
idler gear. The reverse idler gear in turn transmits
power to the gear on the countershaft and in turn
transmits power to the output shaft.
Because power is being transmitted through the re-
verse idler gear, the countershaft and output shaft
will rotate in the opposite direction as for forward
gear ratios. The rear input shaft will also rotate in the
opposite direction.