TM 9-4931-374-13&P
B-3. MAINTENANCE FUNCTIONS (cont)
d. Adjust. To maintain, within prescribed limits, by bringing into proper
performed by the Army. Overhaul does not normally return an item to like
or exact position, or by setting the operating characteristics to specified
new condition.
parameters.
k. Rebuild. Consists of those services/actions necessary for the
e. Aline. To adjust specified variable elements of an item to bring about
restoration of unserviceable equipment to a like new condition in accordance
optimum or desired performance.
with original manufacturing standards. Rebuild is the highest degree of
materiel maintenance applied to Army equipment. The rebuild operation
f. Calibrate. To determine and cause corrections to be made or to be
includes the act of returning to zero those age measurements (hours/ miles,
adjusted on instruments or test, measuring, and diagnostic equipment used
etc.) considered in classifying Army equipments/components.
in precision measurement. Consists of comparisons of two instruments, one
of which is a certified standard of known accuracy, to detect and adjust any
B-4. STANDARD GROUPS (COLUMNS 1 AND 2)
discrepancy in the accuracy of the instrument being compared.
a. Column 1, Group Number. Column 1 lists functional group code
g. Install. The act of emplacing, seating, or fixing into position an item,
numbers, the purpose of which is to identify components, assemblies,
part, or module (component or assembly) in a manner to allow the proper
subassemblies, and modules with the next higher assembly.
functioning of an equipment or system.
b. Column 2, Component/Assembly. Column 2 contains the names of
h. Replace. The act of substituting a serviceable like type part,
components, assemblies, subassemblies, and modules for which
subassembly, or module (component or assembly) for an unserviceable
maintenance is authorized.
counterpart.
B-5. MAINTENANCE FUNCTION (COLUMN 3)
The application of maintenance services1 or other
i. Repair.
Column 3 lists the functions to be performed on the items listed in column 2.
maintenance actions2 to 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.
1Services--inspect, test, service, adjust, aline, calibrate, or replace.
j. Overhaul. That maintenance effort (service/ action) necessary to
2Actions--welding, grinding, riveting, straightening, facing, remachining,
restore an item to a completely serviceable/operational condition as
prescribed by maintenance standards in appropriate technical publications
or resurfacing.
(i.e., DMWR). Overhaul is normally the highest degree of maintenance
B-4
