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 86 of 323
CHAP
2,
SEC
V
TORQUE PATH S
PAR
5 3
Figure 29. First-gear, full-right-steer torque path, converter operation
53. TORQUE PATH
-
-
FIRST GEAR,
FULL-RIGHT STEER, CONVERTER
OPERATION (fig. 29)
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
first-gear steer. Steering results when the
brake is applied at one side while the drive
clutch is engaged at the opposite side. The
drive clutch is the geared steer clutch. The
vehicle steers toward the braked side.
c . In right steer, in first gear, the right
5 6
brake is applied while the right-drive clutch
is released. The drive clutch on the left side
is still engaged and continues to drive. Hy-
draulic 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 left-geared steer
clutch (the drive clutch), apply the left brake,
and result in left steer.
d . In full steer, the applied brake locks
the steer planetary carrier and rotation stops
at that side. In partial steer, the applie d
brake only slows the side toward which the
turn is made. The degree of steer is con -
trolled by the degree of movement of the steer
control. Refer to TABULATED DATA, par .
7, for the gear ratios which apply to first gear,
full-right steer.
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