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TM 9-2350-238-20-1
B-2. MAINTENANCE FUNCTIONS (CONT).
d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact
position, or by setting the operating characteristics to specified parameters.
e.  Align. To adjust specified variable elements of an item to bring about optimum or desired
peformance.
f. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or
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.
g. Remove/lnstall. 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.
h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place.
"Replace" is authorized by the MAC and is shown as the 3d position code of the SMR code.
i. Repair. The application of maintenance services2 including fault location/troubleshooting3,
removal/installation, and disassemblyassembly4 procedures, and maintenance actions5 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.
j. 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 (i.e., DMWR). Overhaul is normally the highest degree of maintenance
performed by the Army. Overhaul does not normally return an item to like new condition.
k. 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.
2
Services-inspect, test, service, adjust, align, calibrate, and/or replace.
3
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).
4
Disassembly/assembly-Encompasses the step-by-step taking apart (or breakdown) of a
spare/functional group coded item to the level of its least componency identified as maintenance
significant (i.e., assigned an SMR code) for the level of maintenance under consideration.
5
Actions-Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
B-2

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