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 23 of 624
TM 9-2320-283-34-1
EQUIPMENT DESCRIPTION AND DATA.
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
f.
Transmission (Continued).
4.
Fourth Clutch.
The fourth clutch has a dual function.
Engaged with the forward clutch, it produces fifth
gear.
Engaged with the first clutch, it produces reverse gear.
The fourth clutch contains ten clutch plates, a clutch piston housing, and a piston.
Five plates are internally
splined and five are externally toothed.
Internally splined clutch plates, driven by the fourth-clutch driving hub, rotate any time the input shaft and the
forward-clutch housing assembly rotates.
When hydraulic pressure is directed to the piston, the piston compresses the clutch plates together.
This
locks the internally splined plates to the externally toothed plates and, in turn, to the clutch housing.
Since the center sun gear and shaft assembly is splined to the clutch housing, it will also rotate at input
speed.
5.
Second Clutch, Third Clutch, and Center Support.
The second and third clutches perform only one
function.
When engaged with forward clutch, the second clutch produces third gear, while the third clutch
produces fourth gear.
The second and third clutches are composed of two identical pistons, twenty-one clutch plates (13 in second
clutch; 8 in third clutch) and a center support.
Two pistons are separated by a wall in the center support
housing assembly.
1-12
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