TM-9-2320-273-10
TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; OPERATOR’S MANUAL
DECEMBER 2012
TM-9-2320-273-10 - Page 94 of 452
ENGINE AND TRANSMISSION FUNCTION - CONTINUED
The M915A1 vehicles use the Allison HT 754CRD transmission, a fully automatic,
5-speed type. Gear selection is accomplished through a remote control cable connecting
a range selector lever on the side of the transmission to a manual control lever
mounted on a control tower in the cab. During normal driving operation, shifting is
controlled automatically by the transmission modulator control, which determines the
transmission gear range setting from the position of the engine fuel control lever on the
fuel injector pump. The transmission drives the speedometer through a gear and cable.
FUEL SYSTEM FUNCTION
The vehicle fuel system consists of a fuel injection pump driven off the air compressor
which is driven by the engine accessory drive. The fuel injection pump has a built-in
governor that meters fuel through a screen filter, solenoid shutoff valve, and into the
injectors.
CREW PROTECTION KIT FUNCTION
The Crew Protection Armor Kit consists of two armored doors, roof armor, windshield
ballistic glass, floor armor, firewall armor, rear cab armor panels, and an armored
emergency exit. The floor armor consists of three panels and is installed under the seat
and operator floor controls. The door armor assembly consists of an armored door,
hinge, sliding ballistic glass, and armored frame that is mounted to the existing door
opening. The rear armor consists of two panels and rests on the floor armor.
Figure 5. M915A1 Transmission Controls.
MANUAL
CONTROL
LEVER
SPEEDOMETER
CABLE
RANGE
SELECTOR
LEVER
TM 9-2320-273-10
0004
0004-6
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