Electric Wires and Connectors. Look for cracked, frayed, or broken insulation, bare wires, and loose or broken
connectors. Tighten loose connectors. Report any damaged wires to your supervisor.
Hoses and Fluid Lines. Look for wear, damage, and leaks, and make sure clamps and fittings are tight.
Wet spots show leaks, but a stain around a fitting or connector can also mean a leak. If a leak comes from a loose fitting or
connector, tighten it. If something is broken or worn out, replace it or report it to your supervisor.
c. CLEANING AGENTS
DO NOT SMOKE when using cleaning solvent. NEVER USE IT NEAR AN OPEN FLAME. Be sure
there is a fire extinguisher nearby and use cleaning solvent only in well-ventilated places. Flash point of
solvent is 138°F (60°C).
USE CAUTION when using cleaning solvents. Cleaning solvents evaporate quickly and can irritate
exposed skin if solvents contact shin. In cold weather, contact of exposed skin with cleaning solvents can
Use only those authorized cleaning solvents or agents listed in Appendix D.
(1) Treating Mildewed Areas. Canvas that has mildewed can be cleaned by scrubbing with a dry brush. If it
is necessary to use water to remove dirt, it should not be used until mildew has been removed. After removing mildew,
examine fabric. Look for evidence of deterioration. If canvas has deteriorated, it should be replaced.
Cleaning Rust or Grease. When cleaning grease buildup or rusty places, use a cleaning solvent. Then apply a thin
coat of light oil to affected area.
LEAKAGE DEFINITIONS FOR UNIT PMCS. Following are types/classes of leakage a maintainer needs to know
to be able to determine the status of the ROWPU. Learn these leakage definitions and remember that it is necessary for you
to know how fluid leakage affects the status of the ROWPU.
CLASS I - Seepage of fluid (as indicated by wetness of discoloration) not great enough to form drops.
CLASS II - Leakage of fluid great enough to form drops but not enough to cause drops to drip from item being
CLASS III - Leakage of fluid great enough to form drops that fall from item being checked/inspected.
Table 2-1. Unit Preventive Maintenance Checks and Services
Item To Check/
Not Fully Mission
a. Check Pump and Motor Pulleys
for wear, cracks and damage.
RO Pump Assembly
Any pulley damaged or
b. Check Drive Belt for cracking,
fraying or breaks.
Belt is brokencracked to the
belt fiber, has more than one
crack (l/8 inch in depth or
50% of belt thickness), has
brays more than 2 inches
long or excessive play
c. Check Belt adjustment for 1/2
d. Drain oil and check for metal
particles on magnetic plug and
milky condition. Replace oil as
necessary, check that filter cover is
tight and breather is not clogged
Cannot be adjusted
Oil is milky or has metal
particles. Breather is un-
2-4 Change 1