TM-5-2350-378-24-P
HYDRAULIC DIAGNOSTIC CENTER (HDC) SUPPORTING ARMORED COMBAT EARTHMOVER (ACE), M9
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
TM-5-2350-378-24-P - Page 739 of 790
0068 00--2
TM 5--2350--378--24&P
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9.
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
S
The following definitions are applicable to the “repair” maintenance function:
S
Services. Inspect, test, service, adjust, align, calibrate, and/or replace.
S
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).
S
Disassembly/assembly. The step--by--step breakdown (taking apart) of a spare/function-
al group coded item to the level of its least component, that is assigned an SMR code for
the level of maintenance under consideration (i.e., identified as maintenance significant).
S
Actions. Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
10. 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.
11. 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 (e.g., hours/miles) considered in classifying Army equipment/components.
Explanation of Columns in the MAC
Column (1) Group Number. Column (1) lists Functional Group Code (FGC) numbers, the purpose of which is to
identify maintenance significant components, assemblies, subassemblies, and modules with the Next Higher As-
sembly (NHA).
Column (2) Component/Assembly. Column (2) contains the item names of components, assemblies, subassem-
blies, and modules for which maintenance is authorized.
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.)
Column (4) Maintenance Level. Column (4) specifies each level of maintenance authorized to perform each func-
tion listed in column (3), by indicating work time required (expressed as man--hours in whole hours or decimals) in
the appropriate subcolumn. This work time figure represents the active time required to perform that maintenance
function at the indicated level of maintenance. If the number or complexity of the tasks within the listed mainte-
nance function varies at different maintenance levels, appropriate work time figures are to be shown for each lev-
el. The work time figure represents the average time required to restore an item (assembly, subassembly, compo-
nent, module, end item, or system) to a serviceable condition under typical field operating conditions. This time
includes preparation time (including any necessary disassembly/assembly time), troubleshooting/fault location
time, and quality assurance time in addition to the time required to perform the specific tasks identified for the
maintenance functions authorized in the MAC. The symbol designations for the various maintenance levels are
as follows:
C
Operator or crew maintenance
O
Unit maintenance
F
Direct support maintenance
L
Specialized repair activity (SRA)
H
General support maintenance
D
Depot maintenance
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