TM 55-4920-394-13&P
4-14. Component Repair.
4-15. General. Component repair consists of performing any repair or part replacement necessary to restore
the component to a serviceable condition. The instructions contained in the following paragraphs cover
complete overhaul of components; however, perform only the procedures necessary to make the required
repair of part replacement. The following general procedures and practices should be observed during repair
and overhaul of components:
a.
Clean all disassembled components, except electrical parts and prelubricated bearings with
solvent, Federal Specification P-D-680. Use a stiff bristle, non-metallic brush to ensure that all
orifices, packing grooves, and ports are thoroughly clean.
WARNING
Use solvent in well ventilated area. Avoid contact with open flames and
avoid inhalation of fumes as injury could result.
b.
Dry all cleaned parts using compressed air at approximately 20 psig, or a clean, lint-free cloth.
c.
After cleaning, inspect all parts for wear and defects such as nicks, burrs, scoring, cracks, corrosion
or similar defects. Inspect all threaded areas for stripped, crossed, or broken threads. Inspect
mounting holes for elongation which would affect component performance.
d.
Polish out minor defects from non-critically dimensioned surfaces using abrasive cloth, Federa
l
Specification P-C-458 for ferrous alloy parts, and abrasive cloth, Federal Specification P-C-451 for
aluminum and magnesium alloy parts. Ensure that precision fits, and seating or sealing surfaces
are not destroyed. Reclean any repaired parts.
CAUTION
Do not use abrasive cloth, Federal Specification P-C-458 on aluminum or
magnesium alloy parts as it contains an iron oxide which causes rapid
oxidation of these metals.
e.
Replace all preformed packings, backup rings, gaskets and seals at each verhaul regardless of
o
condition.
f.
During reassembly of hydraulic components, assemble parts wet, dipping them in hydraulic fluid,
Military Specification MIL-H5606 or MIL-H-82382. If components are not to be immediately
reinstalled on test stand reassemble wet using preservative fluid, Military Specification MIL-H-6083.
g.
Perform hydraulic component tests using a clean source of hydraulic fluid, Military Specification
MIL-H-5606 or MIL-H-82382, filtered to 10 microns or better.
4-2