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 77 of 323
Figure 20
PAR
43-4 4
TORQUE PATH S
CHAP
2,
SEC
V
mitted hydraulically from the converter pump
to the converter turbine. When the lockup
clutch is engaged, the pump and turbine are
locked together and torque is transmitted me-
chanically.
b . When transmitted hydraulically, the
torque maybe multiplied as much as 3.3 times
(at turbine stall). When transmitted mechani-
cally, torque leaving the converter is equal to
that entering it. The lockup clutch engages
and releases automatically.
c . At lower speeds, when high torque is
required, the lockup clutch is released. At
higher speeds, when less torque is required,
the lockup clutch is engaged. Lockup engage-
ment can occur in every gear range and in
neutral. In figures 22 through 34 the converter
output is indicated by yellow when the lockup
clutch is released; by red when engaged.
44. TORQUE PATH - OUTPUT
TRANSFER GEARING (fig. 20)
a . Two gears makeup the output transfer
gearing. The drive gear is splined to the low-
range carrier shaft which is the range gearing
output for the power train regardless of which
gear is engaged.
The drive gear meshes with
the driven gear and imparts opposite rotation.
b . The driven gear transmits torque ,
through a splined shaft, to the steer planetary
ring gears on either side of the driven gear.
The speed reduction, and corresponding torque
increase, is 1.30 to 1.00.
4 7
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