TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9--2350--311--20--2 B--2 B--2 MAINTENANCE FUNCTIONS -- CONTINUED g. Remove/Install. 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 assem- bly) 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 assigned maintenance level is shown as the 3d position code of the SMR code. i. Repair. The application of maintenance services 1 including fault location/troubleshooting 2 , removal/installation and disassembly/assembly procedures, and maintenance actions 4 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/opera- tional condition as required by maintenance standards in appropriate technical manuals (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 (e.g., hours/miles) 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 mainte- nance significant components, assemblies, subassemblies, and modules with the next higher assembly. b. Column 2, Component/Assembly. Column 2 contains the item names of components, assemblies, subassemblies, and modules for which maintenance is authorized. (* indicates item applies only to M109A2/M109A3 howitzers.) (*** indicates item applies only to M109A4/M109A5 howitzers.) No asterisk indicates item is common to all vehicle configu- rations. c. Column 3, Maintenance Function. Column 3 lists the functions to be performed on the item listed in Column 2. (For detailed explanation of these functions, see paragraph B--2.) 1 Services -- Inspect, test, service, adjust, align, calibrate, and/or replace. 2 Fault location/troubleshooting -- The process of investigating and detecting the cause of equip- ment malfunctioning; the act of isolating a fault within a system or unit under test (UUT). 3 Disassembly/assembly -- The step-by-step breakdown (taking apart) of a spare/functional group coded item to the level of its least component, that is assigned an SMR code for the level of main- tenance under consideration (i.e., identified as maintenance significant. 4 Actions -- Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.