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 87 of 323
PAR
5 4
TORQUE PATH S
CHAP
2,
SEC
V
Figure 30. Second-gear, full-left-steer torque path, lockup operation
54. TORQUE PATH
-
-
SECOND GEAR,
FULL-LEFT STEER, LOCKUP
OPERATION (fig. 30)
a . Torque is transmitted to the stee r
planetary ring gears in the same manner as
that for first gear, as described in par. 47a
and b , above. From this point, to the power
train outputs, the torque paths for the right
and left sides are different.
b . The clutch-brake method is used for
second-gear steer. In this method, steering
results when the brake is applied at one side
while the drive clutch is engaged at the opposite
side. In second gear, the drive clutch is the
output clutch.
The vehicle steers toward the
side on which the brake is applied.
c . In left steer, in second gear, the left
brake is applied while the left-output clutch
is released.
The drive clutch (output clutch)
on the right side is still engaged and continues
to drive.
Hydraulic action, controlled by the
steer control valve, releases the drive clutch
and applies the brake. An opposite movement
of the steer control valve will release the
right-output clutch, apply the right brake, and
result in right steer.
d . Full and partial steer in second gear
is controlled as explained in par. 53d, above.
Refer to
TABULATED DATA,
par. 7, for
gear ratios applicable to second gear, lef t
steer .
5 7
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