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 88 of 323
CHAP
2,
SEC
V
TORQUE PATH S
PAR
5 5
55.
Figure 31.
Third-gear, full-right-steer torque path, converter operation
TORQUE PATH
-
-
THIRD GEAR,
FULL-RIGHT STEER, CONVERTER
OPERATION (fig. 31)
a . Torque is transmitted to the stee r
planetary ring gears in the same manner as
described in par. 49a and b , above. Fro m
this point, to the power train outputs, the
torque paths for the right and left sides are
different.
b . The geared steer method is used for
third-gear steer. In this method, steerin g
results when the geared steer clutch is en-
gaged at one side while the drive clutch (out-
put clutch) is applied at the opposite side. The
vehicle steers toward the side on which the
geared steer clutch is engaged.
c . In right steer, in third gear, the right-
geared steer clutch is applied while the right-
output clutch is released. The drive clutch on
the left side is still engaged and continues to
drive .
Hydraulic action, controlled by the
steer control valve, releases the drive clutch
and applies the geared steer clutch. An op-
posite movement of the steer control valve will
release the left-output clutch, engage the left-
geared steer clutch, and result in left steer.
d . In full steer, the applied geared steer
clutch locks the geared steer planetary sun
gear and slows the geared steer planetary
carrier. In partial steer, the geared stee r
clutch is only partially applied and slows the
output to a lesser degree. The degree of steer
is controlled by the degree of movement of the
steer control. Refer to TABULATED DATA,
par. 7, for the gear ratios applicable to third
gear, right steer.
5 8
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