TM-9-2320-283-34-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1983
TM-9-2320-283-34-1 - Page 31 of 624
TM 9-2320-283-34-1
DESCRIPTION AND DATA.
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
f.
Transmission (Continued).
8.
Planetary Gearing (Continued).
This connection of the planetary input, reaction, and output elements and connections with the forward and
fourth clutches produces five forward speeds and one reverse speed.
The front planetary assembly, used in conjunction with the center planetary assembly,
produces
third
gear
when the
forward
and
second clutches are applied.
The center planetary is active in third, fourth, fifth, and reverse gears.
The rear planetary assembly is inactive in second, third, fourth, and fifth gears.
In second
gear, with the
application of
forward and first clutches, it transmits torque, at a reduction, through the low carrier to the output
shaft.
In third, fourth, and fifth gears, its only function is the transmitting of torque through the planetary carrier
assembly to the output shaft.
The
planetary carrier
assembly
is active
in all
gears.
With the application of the forward clutch with any
one of the other clutches (low-reverse, first, second, third, fourth) torque is transmitted, via the main shaft and
planetary components, through the carrier to the output shaft.
In reverse gear, torque is transmitted through
the fourth clutch housing, sun gear shaft assembly, center assembly, and main shaft assembly to the low sun
gear and carrier.
NOTE
In fifth gear, because both the forward and fourth clutches are engaged, all four planetary rotate
as a unit.
This gives direct drive through the transmission.
1-20
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