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 27 of 624
TM 9-2320-283-34-1
EQUIPMENT DESCRIPTION AND DATA
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
f.
Transmission (Continued).
6.
First Clutch.
The first clutch has a single function.
Engaged with the forward clutch, it produces second
gear.
The first clutch contains thirteen
clutch plates
and a piston.
Six are internally splined clutch plates and
seven are externally toothed clutch plates.
The externally toothed plates are held stationary
by the
transmission housing, while the internally splined plates are free to rotate.
When the first clutch is released,
internally splined plates are free to rotate.
Since the
rear 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
the rotating internal plates
to the stationary external plates
preventing the ring gear from rotating.
With
the application of the forward clutch in
conjunction with the first
clutch, a
reaction within the planetary
gearing
will produce a forward rotation at the output shaft.
7.
Low-Reverse Clutch.
The low-reverse clutch has
a dual function.
When engaged
with the
forward
clutch,
it produces first gear.
When engaged with the fourth clutch, it produces reverse gear.
The low-reverse clutch contains thirteen clutch plates and a piston.
Six are internally splined clutch plates
and seven are externally toothed clutch plates.
The externally toothed plates are held stationary
by the
adapter housing, while the internally splined plates are free to rotate.
1-16
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