TM 11-6625-298-14
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
C-1. General
(component or assembly) for an unserviceable
counterpart.
This appendix provides a summary of the main-
i. Repair. The application of maintenance
tenance operations for ZM-21/U, ZM-21A/U, and
services (inspect, test, service, adjust, align,
ZM-21B/U. It authorizes categories of main-
claibrate, replace) or other maintenance actions
tenance for specific maintenance functions on
(welding, grinding, riveting, straightening, facing,
repairable items and components and the tools and
remachining, or resurfacing) to restore serv-
equipment required to perform each function. This
iceability to an item by correcting specific
appendix may be used as an aid in planning
damage, fault malfunction, or failure in a part,
maintenance operations.
subassembly, module/component/assembly, end
C-2. Maintenance Function
item or system. This function does not include the
Maintenance functions will be limited to and
trial and error replacement of running spare type
defined as follows:
items such as fuses, lamps, or electron tubes.
a. Inspect. To determine the serviceability of an
j. Overhaul. That periodic maintenance effort
item by comparing its physical, mechanical, and/or
(service/action) necessary to restore an item to a
electrical characteristics with established standards
completely serviceable/operational condition as
through examination.
prescribed by maintenance standards (e.g., DMR)
b. Test. To verify serviceability and to detect
in appropriate technical publications. Overhaul is
incipient failure by measuring the mechanical or
normally the highest degree of maintenance per-
electrical characteristics of an item and comparing
formed by the Army. Overhaul does not normally
those characteristics with prescribed standards.
return an item to like-new condition.
c. Service. Operations required periodically to
k. Rebuild. Consists of. those services/actions
keep an item in proper operating condition; i.e., to
necessary for the restoration of unserviceable
clean, preserve, drain, paint, or to replenish
equipment to a like-new condition in accordance
fuel/lubricants/hydraulic fluids or compressed air
with original manufacturing standards. Rebuild is
supplies.
the highest degree of material maintenance applied
d. Adjust. Maintain within prescribed limits by
to Army equipment. The rebuild operation includes
bringing into proper or exact position, or by
t h e act of returning to zero those age
setting the operating characteristics to the
measurements (hours, miles, etc. ) considered in
specified parameters.
classifying Army equipment/components.
e. Align. To adjust specified variable elements
C-3. Column Entries
of an item to about optimum or desired per-
a. Column 1, Group Number. Column 1 lists
formance.
group numbers, the purpose of which is to identify
f. Calibrate. To determine and cause corrections
components,
assemblies,
subassemblies, and
to be made or to be adjusted on instruments or
modules with the next higher assembly.
test measuring and diagnostic equipment used in
b. Column 2, Component/Assembly. Column 2
precision measurement. Consists of the comparison
contains, the noun names of components, assem-
of two instruments, one of which is a certified
blies, subassemblies, and modules for which
standard of known accuracy, to detect and adjust
maintenance is authorized.
any discrepancy in the accuracy of the instrument
c. Column 3, Maintenance Functions. Column 3
being compared.
lists the functions to be performed on the item
g. Install. The act of emplacing, seating, or
listed in column 2. When items are listed without
fixing into position an item, part, module (com-
maintenance functions, it is solely for purpose of
ponent or assembly) in a manner to allow the
having the group numbers in the MAC and RP-
proper functioning of the equipment/system.
STL coincide.
h. Replace. The act of substituting a serv-
d. Column 4, Maintenance Category. Column 4
iceable like-type part, subassembly, model
C-1
