TB-9-3950-253-13-P
PALLETIZED LOAD SYSTEM TRUCK, M1075 and M1075A1 (PLS) AND HEAVY EXPANDED MOBILITY TACTICAL TRUCK, M1120, M1120A2, AND M1120A4 (HEMTT), ENHANCED CONTAINER HANDLING UNIT (E-CHU)
TECHNICAL BULLETIN; OPERATOR AND FIELD MAINTENANCE, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2009
TB-9-3950-253-13-P - Page 655 of 704
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TB 9-3950-253-13&P
SUPPORTING INFORMATION
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MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
THE ARMY MAINTENANCE SYSTEM MAC
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1. This introduction provides a general explanation of all maintenance and repair functions authorized at the two
maintenance levels under the Two-Level Maintenance System concept.
2. The MAC designates overall authority and responsibility for the performance of maintenance functions on the
identified end item or component. The application of the maintenance functions to the end item or component
shall be consistent with the capacities of the designated maintenance levels, which are shown in the MAC ( in
column (4) as:
Field - includes subcolumns:
C - Crew
O - Service
F - Field
Sustainment - includes subcolumns:
H - Below Depot
D - Depot
3. The Tools and Test Equipment Requirements list the tools and test equipment (both special tools and common
tool sets) required for each maintenance function as referenced from the MAC.
4. The Remarks column contains supplemental instructions and explanatory notes for a particular maintenance
function.
MAINTENANCE FUNCTIONS
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Maintenance functions are limited to and defined as follows:
1.
Inspect.
To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical
characteristics with established standards through examination (e.g., by sight, sound, or feel).
2.
Test.
To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics of
an item and comparing those characteristics with prescribed standards on a scheduled basis, i.e., load testing
of lift equipment.
3.
Service.
Operations required periodically to keep an item in proper operating condition; e.g., to clean (includes
decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids,
or gases. The following are examples of service functions:
a. Unpack. To remove from packing box for service or when required for the performance of maintenance
operations.
b. Repack. To return item to packing box after service and other maintenance operations.
c.
Clean. To rid of the item of contamination.
d. Touch up. To spot paint scratched or blistered surfaces.
e. Mark. To restore obliterated identification.
4.
Adjust.
To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting the
operating characteristics to specified parameters.
5.
Align.
To adjust specified variable elements of an item to bring about optimum or desired performance.
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