TM-9-2520-234-35
POWER TRAIN ASSEMBLY; ALLISON MODEL XTG411-2A
TECHNICAL MANUAL; FIELD AND DEPOT MAINTENANCE MANUAL
JULY 1962
TM-9-2520-234-35 - Page 80 of 323
Figure 23
CHAP
2,
SEC
V
TORQUE PATH S
PAR
4 7
47. TORQUE PATH – FIRST GEAR,
CONVERTER OPERATION (fig. 23)
a . In first gear, torque is transmitted to
the turbine shaft through the input transfer
gearing and the torque converter (or lockup
clutch). The low-range sun gear is splined to
the turbine shaft and imparts torque to the
low-range planetary pinions. The low-range
clutch is engaged, holding the low-range ring
gear stationary. Thus, the low--range plane-
tary pinions must rotate within the stationary
ring gear. This drives the low-range plane-
tary carrier and shaft in the same direction
as the turbine shaft but at reduced speed.
b . The low-range carrier shaft drive s
the output transfer drive gear. In turn, the
drive gear transmits torque to the output trans-
fer driven gear, causing it to rotate in the op-
posite direction. The driven gear transmits
torque to the right- and left-geared stee r
planetary ring gears.
c . The right- and left-geared stee r
clutches are engaged, holding the geared steer
sun gears stationary. The geared steer plane-
tary pinions, meshed with both the sun gears
and ring gears, are forced to rotate around
the stationary sun gears. The carrier thus
becomes the output member of the geared steer
planetary. Rotation at reduced speed is trans-
mitted to the right- and left-output couplings.
Refer to par. 7 for gear ratios applicable to
first gear.
5 0
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