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 29 of 624
TM 9-2320-283-34-1
.
EQUIPMENT DESCRIPTION AND DATA
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
f.
Transmission (Continued).
7.
Low-Reverse Clutch (Continued).
When the low-reverse clutch is released, internally splined clutch plates are free to rotate.
Since low
planetary ring gear is splined
to the internal plates, it will also rotate freely.
When hydraulic pressure is directed to the piston, the piston compresses the
clutch plates
together.
This
locks
rotating internally splined plates to stationary externally toothed plates, preventing ring gear from
rotating.
With the application of the forward or fourth clutch in conjunction with the low-reverse clutch, a reaction
within the planetary gearing will produce either forward or reverse rotation, respectively, at the output shaft.
8.
Planetary Gearing.
The planetary gearing is composed of a gear unit and main shaft assembly and the
planetary carrier assembly with its sun gear and ring gear.
The gear
unit
and main
shaft assembly
contains
three
planetaries called front, center, and rear, so
designated because of their location in relation to each other in the gear unit.
Each of the three planetaries has a sun gear and a ring gear which are connected by the main transmission
shaft and a connecting drum.
The low planetary gear set is located behind the gear unit and main shaft assembly.
It contains
a sun gear,
a carrier
assembly, and a ring gear.
The sun gear is splined to the main shaft and the rear
carrier is splined
to the low ring gear, thereby connecting the four planetary systems.
1-18
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