a. Wheel chocks should always be set before performing any maintenance. Remove wheel chocks (1) from
holders (2) and position behind rearmost wheels.
b. Use blocking whenever possible to provide a secure, steady working base. When blocking is specific to a
procedure, blocking instructions will be included in the procedure paragraph.
Inspect all parts before, during, and after maintenance. The following general inspection should be performed
when repairing assemblies:
(1) Inspect for damaged, deteriorated, broken, or frayed parts.
(2) Inspect parts for uneven wear, out-of-roundness, scoring, and warping.
(3) Inspect all metal parts for scratches, dents, marred paint, cracks, rust, and corrosion.
(4) Inspect for loose, missing, cracked, or damaged hardware. Repair or replace as required.
(5) Inspect for damaged threads, keys, and holes
4-19. DISASSEMBLY AND ASSEMBLY.
a. Complete disassembly of a component is not always necessary to make a required repair or replacement.
Good judgement should be used to keep disassembly to a minimum.
b. When disassembling a component, first follow basic inspection procedures (para 4-18), then remove as
many major assemblies and subassemblies as necessary. These may then be disassembled, as required, into
c. During disassembly, tag critical parts such as shims, bearings, and electrical harness leads to facilitate
assembly. This is especially important for electrical equipment if circuit number tags are missing or illegible.
d. During assembly, assemble subassemblies first, combine into major assemblies where possible, and
then install to form a complete component.
Records to provide repair and replacement data and statistics should be carefully prepared and
maintained in accordance with DA Pam 738-750.