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 82 of 323
CHAP
2,
SEC
V
TORQUE PATH S
PAR
4 9
Figure 25. Third-gear torque path, lockup operation
49. TORQUE PATH – THIRD GEAR,
LOCKUP OPERATION (fig. 25)
a . Torque is transmitted to the low- and
intermediate-range planetary sun gears in the
manner described in pars. 42 and 43, above.
In third gear, the low- and intermediate-range
planetary gears are compounded to produce
the desired speed reduction ratio. The inter-
mediate-range clutch is engaged, holding the
intermediate-range ring gear stationary. The
intermediate-range planetary pinions, meshed
with the intermediate-range sun gear, which
is rotating, and the stationary ring gear, must
rotate within the ring gear. This action drives
the intermediate-range planetary carrier.
b . The low-range planetary ring gear is
attached to the intermediate-range carrier and
rotates at a slower speed than the low-range
sun gear. Thus, the faster moving sun gear,
and slower moving ring gear, combine to drive
the low-range planetary pinions. The output
member of this compound arrangement is the
low-range planetary carrier and shaft.
c . The remainder of the torque path is
identical to that described for second gear
(par. 48, above) .
Refer to
TABULATE D
DATA,
par. 7, for gear ratios applicable to
third gear.
52
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