TB-9-3950-253-13-P
PALLETIZED LOAD SYSTEM TRUCK, M1075 and M1075A1 (PLS) AND HEAVY EXPANDED MOBILITY TACTICAL TRUCK, M1120, M1120A2, AND M1120A4 (HEMTT), ENHANCED CONTAINER HANDLING UNIT (E-CHU)
TECHNICAL BULLETIN; OPERATOR AND FIELD MAINTENANCE, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2009
TB-9-3950-253-13-P - Page 656 of 704
0056-2
TB 9-3950-253-13&P
0056
MAINTENANCE FUNCTIONS – CONTINUED
6.
Calibrate.
To determine and cause corrections to be made or to be adjusted on instruments of test, measuring,
and diagnostic equipment used in precision measurement. Consists of comparisons of two instruments, one of
which is a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the
instrument being compared.
7.
Remove/Install.
To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
8.
Paint (ammunition only).
To prepare and spray color coats of paint so that the ammunition can be identified
and protected. The color indicating primary use is applied, preferably, to the entire exterior surface as the
background color of the item. Other markings are to be repainted as original so as to retain proper ammunition
identification.
9.
Replace.
To remove an unserviceable item and install a serviceable counterpart in its place. “Replace” is
authorized by the MAC and assigned maintenance level is shown as the third position code of the Source,
Maintenance, and Recoverability (SMR) code.
10.
Repair.
The application of maintenance services, including fault location/troubleshooting, removal/installation,
disassembly/assembly procedures, and maintenance actions to identify troubles and restore serviceability to
an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component
or assembly), end item, or system.
NOTE
The following definitions are applicable to the “repair” maintenance function:
•
Services - Inspect, test, service, adjust, align, calibrate, and/or replace.
•
Fault location/troubleshooting - The process of investigating and detecting the cause of
equipment malfunctioning; the act of isolating a fault within a system or Unit Under Test
(UUT).
•
Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/functional
group coded item and to the level of its least component, that is assigned a SMR code for
the level of maintenance under consideration (i.e., identified as maintenance significant).
•
Actions - Weld, grind, rivet, straighten, face, machine, and/or resurface.
11.
Overhaul.
That maintenance effort (service/action) prescribed to restore an item to a completely serviceable/
operational condition as required by maintenance standards in appropriate technical publications. Overhaul is
normally the highest degree of maintenance performed by the Army. Overhaul does not normally return an item
to like new condition.
12.
Rebuild.
Consists of those services/actions necessary for the restoration of unserviceable equipment to a like
new condition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel
maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those age
measurements (hours/miles, etc.) considered in classifying Army equipment/components.
EXPLANATION OF COLUMNS IN THE MAC, TABLE 1
00056
1.
Column (1) - Group Number.
Column (1) lists Functional Group Code numbers, the purpose of which is to
identify maintenance significant components, assemblies, subassemblies, and modules with the Next Higher
Assembly (NHA).
2.
Column (2) - Component/Assembly.
Column (2) contains the item names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
3.
Column (3) - Maintenance Function.
Column (3) lists the functions to be performed on the item listed in
Column (2). (For a detailed explanation of these functions refer to
Maintenance Functions
outlined above).
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