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 36 of 1616
TM 9-2320-440-13&P
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HYDRAULIC SYSTEM OVERVIEW
All HEMTT THAAD auxiliary hydraulics are only active when hydraulic selector switch is in the MRP position.
Outriggers are incorporated at rear of vehicle to help stabilize vehicle during elevation and firing of Missile Round
Palette (MRP).
Controls for these outriggers are located at rear of the vehicle.
Outriggers are intended to operate
with engine at low idle (700 rpm), which is regulated by a palm button switch located near outrigger control levers.
Two hydraulic MRP rack locks are located on each side of vehicle near LHS hook arm.
These rack locks are used
to hold MRP subframe in place while elevating MRP deck. Operation of rack locks is controlled by a lever located
on passenger side of vehicle.
MRP rack locks are intended to operate with engine at high idle (1500 rpm).
The
lever controlling rack locks is only active when MRP palm button switch is depressed.
MRP is elevated by two hydraulic deck elevation cylinders. Elevation of the cylinders is controlled by a lever
located on passenger side of vehicle. When activated, deck elevation cylinders begin raising with engine at low idle
(700 rpm). Engine automatically increases to high idle (1500 rpm) after deck reaches an angle of 5 degrees. The
lever controlling deck elevation cylinder operation is only active when MRP palm button switch is depressed.
A hydraulic ground rod driver is included with the HEMTT THAAD and is connected to vehicle’s hydraulic system at
a connection point located on forward side of stowage box.
The ground rod driver is a low-pressure hydraulic
device and must be operated with engine at low idle (700 rpm).
A toggle switch located on bottom of MRP palm
button switch housing restricts engine to low idle and must be turned on before ground rod driver can be used.
The high-pressure hydraulic filter is located beneath middle of driver side frame rail.
A high-volume oil reservoir is used on the HEMTT THAAD.
For further hydraulic system overview information, refer to
LOAD HANDLING SYSTEM (LHS) OVERVIEW
The LHS is fully hydraulic and powered by vehicle’s hydraulic system.
The LHS is operated by a hydraulic selector
switch and a joystick located in cab. The LHS control system is electrically powered from vehicle’s electrical
system.
The HEMTT THAAD uses two VIMs and an input module to regulate LHS and MRP operation.
The digital controller on the HEMTT THAAD causes LHS operation to be disabled under the following conditions:
•
When vehicle is moving over 3 mph.
•
When engine is operating at less than 500 rpm.
•
When any cables are connecting the MRP to the Missile Umbilical Junction Box (MUJB).
•
When MRP rack locks are engaged.
•
When deck elevation cylinders are not stowed.
The MRP can only be loaded and unloaded with the hydraulic selector switch in AUTO mode.
MANUAL mode is
not used for MRP loading and unloading, but is still available if required.
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TM 9-2320-347-10
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