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

  TB-9-3950-253-13-P - Page 219 of 704

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TB 9-3950-253-13&P
FIELD MAINTENANCE
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GENERAL MAINTENANCE INSTRUCTIONS
GENERAL
00020
1. These general maintenance instructions contain general shop practices and specific methods with which you
must be familiar to properly maintain the Enhanced Container Handling Unit (E-CHU). You should read and
understand these practices and methods before performing any Field Maintenance procedures.
2. Before beginning a task, find out how much repair, modification or replacement is needed to fix the equipment.
Sometimes the reason for equipment failure can be seen right away and complete teardown is not necessary.
Disassemble equipment only as far as necessary to repair or replace damaged parts.
3. In some cases, a part may be damaged during removal. If the part appears to be good, and other parts behind
it are not defective, leave it in place and continue with the procedure. Here are a few simple rules:
a. DO NOT remove dowel pins or studs unless loose, bent, broken, or otherwise damaged.
b. DO NOT remove bearings or bushings unless damaged. If you need to remove them to access parts
behind, carefully pull out bearings and bushings.
c.
Replace all gaskets, lockwashers, locknuts, seals, sealing washers, sealing rings, cotter pins, and O-rings.
WORK SAFETY
00020
1. Before beginning a procedure, think about the safety risks and hazards to yourself and to others. Wear
protective gear such as safety goggles or lenses, safety shoes, rubber apron, or gloves.
2. Before beginning a procedure, ensure the following conditions have been observed, unless otherwise
specified:
a. Engine must be off (PLS: TM 9-2320-364-14&P, HEMTT: TM 9-2320-326-14&P).
b. Components must be at operating temperature to be tested.
c.
Components which are hot at operating temperatures (i.e., hydraulic systems) must cool down before they
are removed.
3. Immediately clean up spilled fluids, IAW spill containment plan, to avoid slipping.
4. When lifting heavy parts, have someone help you. Ensure lifting equipment or jack is working properly, meets
weight requirement of part being lifted, and is securely fastened to part.
5. Always use power tools carefully.
6. Observe all WARNINGs, CAUTIONs, and NOTEs.
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