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 21 of 624
TM 9-2320-283-34-1
EQUIPMENT DESCRIPTION AND DATA.
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
f.
Transmission (Continued).
3.
Forward Clutch and In put Shaft.
The forward clutch has multiple functions.
When engaged with low
clutch, it produces first gear.
When engaged with first, second, third, or fourth clutches, it produces second,
third, fourth, or fifth gears, in that sequence.
The forward clutch has a clutch housing with input shaft attached, ten clutch plates, a piston, a forward clutch
hub and a fourth-clutch driving hub.
Five of the clutch plates are internally splined, while the remaining five are externally toothed.
The internally
splined plates are splined to the forward clutch hub.
The externally toothed plates are anchored against
rotation by the internal grooves of the forward clutch housing.
Clutch housing and shaft assembly rotate when the converter turbine rotates.
Fourth-clutch drive hub also
rotates causing the internally splined plates of the fourth-clutch pack to rotate.
When hydraulic pressure is directed to the piston, clutch plates are compressed together.
This locks forward-
clutch hub to the forward clutch housing.
Since hub is splined to the transmission main shaft, the shaft
will
rotate with the hub, at input speed.
The simultaneous application of two clutches is necessary to produce one forward or one reverse gear.
The
forward clutch is applied only in forward gears.
When the converter turbine rotates, and the forward clutch is
applied, it drives the output shaft.
1-10
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