TM-9-2520-254-34
TRANSMISSION, AUTOMATIC, ALLISON, MODEL TX100-1
TECHNICAL MAUAL; DIRECT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1971
TM-9-2520-254-34 - Page 36 of 126
Section III. TORQUE PATHS THROUGH TRANSMISSION
2-22. Torque Path—Neutral
(fig. 2-11)
a.
In neutral, drive from the vehicle engine to the
Transmission range gearing is always through the oil
in the torque converter. Lockup cannot occur in
neutral. The converter turbine drives the turbine
shaft and the components which are attached to it.
b.
The components attached to the turbine shaft
include
the high-range
clutch housing, in-
termediate-range planetary sun gear, and the low-
range planetary sun gear. The power take-off drive
gear, being integral with the high-range clutch
housing, is driven and can drive the power takeoff,
if the transmission is so equipped.
c.
No clutches are engaged. Thus, no drive,
except that to a power takeoff, extends beyond the
turbine shaft.
The torque
multiplication
capabilities and hydraulic drive characteristics of
the torque converter are available to drive the
power takeoff.
2-23. Torque Path—Low Range
(fig. 2-12)
a.
Lockup operation (direct drive through the
torque converter) is shown in figure 2-12. However,
converter operation is equally applicable and is
always in effect until turbine shaft speed (and front
governor speed) is sufficient to cause lockup. Thus,
the vehicle always starts in converter operation
regardless of the selector position used.
b.
In low range (first gear), the low-range clutch
is engaged. This holds the low-range planetary ring
gear stationary. The low-range planetary sun gear
drives the pinions of the low-range planetary
carrier. The pinions
must rotate within the
stationary ring gear. Their rotation within the ring
gear causes the low-range carrier to rotate in the
same direction as the turbine shaft but at reduced
speed. The carrier, integral with the transmission
output shaft, drives the output shaft.
2-27
Back to Top
