B-2Change 4B-2. MAINTENANCE FUNCTIONS (Con’t).c.d.e.f.g.h.i.j.k.SERVICE. Operations required periodically to keep an item in proper operating condition,to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, or gases.TM 9-2350-267-20i.e., to clean (includes decontamination, when required),ADJUST. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by setting the operating characteristics tospecified 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 equipments usedin precision measurement. Consists of comparisons of two instruments, one of which is a certified standard of known accuracy, to detect and adjustany discrepancy in the accuracy of the instrument being compared.REMOVE/INSTALL. To remove and install the same item when required to perform service or other maintenance functions. Install maybe the actof emplacing, seating, or fixing into position a spare, repair part, or module (component or assembly) in a manner to allow the proper functioning ofan equipment or system.REPLACE. To remove an unserviceable item and install a serviceable counterpart, in its place. “Replace” is authorized by the MAC and is shownas the 3d position code of the SMR code.REPAIR. The application of maintenance services, including fault Iocation/troubleshooting, removal/installation, and disassembly/assemblyprocedures, and maintenance actions to identify troubles and restore serviceability to an item by correcting specific damage, fault, malfunction, orfailure in a part, subassembly, module (component or assembly), end item, or system.OVERHAUL. That maintenance effort (service/action) required to restore an item to a completely serviceable/operational condition as required bymaintenance standards in appropriate technical publications (i.e., DMWR). Overhaul is normally the highest degree of maintenance performed bythe Army. Overhaul does not normally return an item to like-new condition.REBUILD. Consists of those services/actions necessary for the restoration of unserviceable equipment to a like-new condition in accordance withoriginal manufacturing standards. Rebuild is the highest degree of materiel maintenance applied to Army equipment. The rebuild operation includesthe act of returning to zero those age measurements (hours/miles, etc.) considered in classifying Army equipment/components.B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.a. COLUMN 1, GROUP NUMBER. Column 1 lists functional group code numbers, the purpose of which is to identify maintenance significantcomponents, assemblies, subassemblies, and modules with the next higher assembly. End item group number shall be “00.”
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