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Appendix A. MAINTENANCE ALLOCATION CHART (MAC)
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TM-9-6115-667-13P Power Unit Diesel Engine Driven 2 1/2 Ton Trailer Mounted 30 kw 50/60 Hz PU-803 Manual
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A-4. EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS
TM 9-6115-667-13&P i. Repair. The  application  of  maintenance  services1  including  fault  location  troubleshooting2,  removal/installation, and disassembly/assembly3 procedures, and maintenance actions4 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), and 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  in  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  service/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 material 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 and components. A-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 significant components, assemblies, subassemblies, and modules with the next higher assembly. b. Column 2 - Component/Assembly. Column 2 contains the names of components, assemblies, subassemblies, and modules for which maintenance is authorized. 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 A-2.) 1Service - Inspect, test, service, adjust, aline, calibrate, and/or replace 2Fault    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). 3Disassembly/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  as  SMR  code  for  the  level  of  maintenance  under  consideration  (i.e., identification as maintenance significant). 4Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing. A-2

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