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 83 of 323
PAR
5 0
TORQUE PATH S
CHAP
2
SEC
V
50. TORQUE PATH – FOURTH
LOCKUP OPERATION (fig.
GEAR,
26)
Figure 26. Fourth-gear torque path, lockup operation
a . Torque is transmitted to the turbine
shaf in the manner described in pars. 42 and
43, above. In fourth gear, torque is trans-
mitted directly by the high-range clutch and
there is no planetary gear action. Engage-
ment of the high-range clutch locks the turbine
shaft and high-range clutch hub together. The
high-range clutch hub is integral with the
intermediate-range planetary carrier. Th e
intermediate-range sun gear is splined to the
turbine shaft. Therefore, the intermediate-
range planetary gearing is locked and rotates
as a unit.
b . The low-range ring gear is attached to
the intermediate-range planetary carrier. As
a result, when the turbine shaft rotates, all
members of all range planetary sets rotate
with the turbine shaft, at the same speed.
Thus, torque is transmitted from the turbine
shaft to the output transfer drive gear at 1 to
1 ratio.
c . The remainder of the torque path is
identical
to
that
for
third
gear.
For
gear
ratios
applicable
to
fourth
gear,
refer
to
TABULATED DATA,
par. 7.
5 3
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