MAINTENANCE FUNCTIONS

TM 9-2320-270-20-3

MAINTENANCE FUNCTIONS - CONTINUED

Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical

characteristics of an item and comparing those characteristics with prescribed standards.

Service. Operations required periodically to keep an item in proper operating condition, i.e., to

clean (includes decontaminate when required), to preserve, to drain, to paint, or to replenish fuel,

lubricants, chemical fluids, or gases.

Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or

by setting the operating characteristics to specified parameters.

Aline. To adjust specified variable elements of an item to bring about optimum or desired

performance.

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.

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

equipment or a system.

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 3rd position code of the SMR code.

Repair. The application of maintenance services2, including fault location/troubleshooting3,

removal/installation, and disassembly/assembly4 procedures, and maintenance actions5 to identify

troubles and restore serviceability to an item by correcting specific damage, fault, malfunction, or

failure in part, subassembly, module (component or assembly), end item, or system.

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 a like new condition.

Services - inspect, test, service, adjust, aline, calibrate, and/or replace.

3Fault location/troubleshoot - The process of investigating and detecting the cause of equipment

malfunction; the act of isolating a fault within a system or unit under test (UUT).

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 category of maintenance under consideration.

Actions welding, grinding, riveting, straightening, facing, remachinery and/or resurfacing.

B-2