TM 5-5420-202-20-1
INTRODUCTION - Continued
(6) Leakage Definitions.
Fluid leaks affect vehicle status. Learn the following classes of fluid leaks for unit PMCS
Class I
Seepage of fluid (as indicated by wetness or discoloration) not great enough
to form drops.
Leakage of fluid great enough to form drops but not enough to cause drops
Class II
to drip from item being checked.
Leakage of fluid great enough to form drops that fall from the item being
Class III
checked.
All Class III leaks and any class fuel leak in the engine compartment or in the personnel
heater system must be repaired before operating the vehicle. Vehicle may be operated with
Class I or Class II leaks.
(7) Corrosion. Check for corrosion on entire vehicle. Become familiar with the four stages of
corrosion listed below and take the appropriate maintenance action required outlined below.
Stage 1-
Red, black, or white corrosion deposits on surface with etching or pitting.
However, base metal is sound.
Powdered granular or scaled condition. Base metal is sound.
Stage 2-
Stage 3-
Surface condition is similar to stage 2 except that metal in the corroded
area is unsound and pin holes may be present.
No metal remaining at point of severest corrosion. Corrosion holes in the
Stage 4-
area or metal completely worn away.
Stages 1 & 2- Areas are to be cleaned, primed, and painted IAW TB 43-0213.
Stages 3 & 4- Try to repair metal. If not economical or reparable, replace with new parts.
INITIAL SETUP
Preventive maintenance includes complete inspection to make sure adjustment, securing, and
assembly of all parts of the vehicle are right. All cleaning, replacement, lubrication, and
protection of parts or assemblies must be done as stated for trouble-free operation until the
next preventive maintenance is performed.
Maintenance Forms and Records. Refer to DA PAM 738-750.
Publications. Be sure all needed publications are on hand before starting task.
Special Tools. Be sure all special tools are on hand.
Supplies. Be sure all parts and supplies are on hand.
Tools. Be sure all common tools are on hand.
Modification Work Order (MWO) Application. Check the list of current MWOs in DA PAM
25-30. Do not make any vehicle modifications except as ordered by official Army directive.
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