TM-9-2320-440-13-P
TERMINAL HIGH ALTITUDE AREA DEFENSE (THAAD) CARRIER
TECHNICAL MANUAL; OPERATOR’S AND FIELD LEVEL MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
AUGUST 2010
TM-9-2320-440-13-P - Page 35 of 1616
TM 9-2320-440-13&P
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OPERATOR MAINTENANCE
THEORY OF OPERATION
SYSTEMS INTRODUCTION
All HEMTT THAAD vehicles contain the same functional systems as M977 vehicles, with some modifications.
Differences for the HEMTT THAAD are outlined in the following paragraphs.
For all systems information not
contained in this manual, refer to
ELECTRICAL SYSTEM OVERVIEW
The electrical system of the HEMTT THAAD has been changed by the addition of several auxiliary components.
The HEMTT THAAD uses a digital control system that includes two Vehicle Interface Modules (VIM), a Joystick
Control Module, and an Input Module. All hardware communicates over the data bus network and controls the
various functions necessary for operation of LHS and MRP-related components. Additional proximity and limit
switches have also been incorporated to provide signals for various safety interlocks. The electrical system
contains a voltage shutdown system. The system will not respond to battery voltage readings less than 8.25 vdc or
greater than 32 vdc.
The battery box for the electrical system has been relocated to the driver side of vehicle; however, its functions are
the same as other HEMTT models.
Auxiliary work lamps have been provided to illuminate the HEMTT THAAD-specific hydraulic controls located at
rear of vehicle and on passenger side. As a safety feature, electric palm button switches located nearby are used
to activate these hydraulic controls.
For further electrical system overview information, refer to
PNEUMATIC SYSTEM OVERVIEW
The rear tandem axles on the HEMTT THAAD incorporate an air-ride suspension.
This suspension incorporates
ride-height valves that self-adjust the air bags to correct setting when vehicle is loaded or unloaded.
Ball valves
have been provided to turn off the self-adjusting feature during air transportation of the HEMTT THAAD.
For further pneumatic system overview information, refer to
FUEL SYSTEM OVERVIEW
Fuel to Tactical Quiet Generator (TQG) fuel tank is supplied from the main HEMTT THAAD fuel tank.
A tee fitting
on the fuel tank connects fuel line supplying the TQG and main fuel line to engine.
This tee fitting also incorporates
check valves on either end, preventing engine from pulling fuel from TQG’s tank.
Fuel/water separator has been relocated near MRP controls on passenger side of vehicle.
For further fuel system overview information, refer to
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TM 9-2320-347-10
TM 9-2320-347-10
TM 9-2320-347-10
TM 9-2320-347-10
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