TM 55-4920-213-15
formed during that part of the daily service it
foreign material from equipment; and the
appears in. Refer to appendix I for listing of
cleaning of such equipment as might be dam-
technical publications containing daily opera-
aged by allowing existing conditions to con-
tor services for individual items of equipment.
tinue.
e. After Operation Service. This service con-
33. Cleaning
sists of investigating any deficiencies noted dur-
Any special cleaning instructions required
ing operation and repeating parts of the before-
for specific mechanisms or parts are contained
operation service. It is the basic daily service
in the TM for the equipment (app. I). General
for equipment and consists of correcting, so far
clean-instructions are as follows:
as possible, any operating deficiencies; in this
a. Use dry-cleaning solvent to clean or wash
manner, the equipment is prepared to operate
grease or oil from all metal parts.
upon short notice.
b. A solution of one part grease-cleaning
f. Inspection. The general inspection of each
compound to four parts of dry-cleaning solvent
item is generally a check to see whether the
may be used for dissolving grease and oil from
item is in good condition, correctly assembled,
the shop and equipment other than optical in-
secure and not excessively worn. Term used
struments. After cleaning, use cold water on
to describe the inspection requirements are de-
exterior surfaces of the shop, to rinse off any
fined as follows;
solution which remains. Operating equipment
(1) Good condition. This is usually an ex-
and hand tools, exclusive of optical instru-
ternal inspection to determine whether
ments, may be wiped with a light lubricating
the unit is damaged beyond serv-
oil.
iceable limits. The term "good condi-
c. When authorized to install new parts, re-
tion" is explained further by the fol-
move any preservative materials, such as rust
lowing; not bent or twisted, not
preventive compound, protective grease, etc.;
chafed or burned, not broken or
prepare parts as required (oil seals, etc.) ; and
cracked, not bare or frayed, not dent-
for these parts requiring lubrication, apply the
ed or collapsed, not torn or cut, not
lubricant prescribed in the lubrication order.
deteriorated.
d. Name plates, caution plates, and instruc-
(2) Correctly assembled. This term refers
tion plates made of steel, rust very rapidly.
to the inspection of a unit to see that
When they are found to be in a rusted condi-
it is in the normal assembled position.
tion, they should be thoroughly cleaned and
It is usually an external visual inspec-
heavily coated with an application of clear
tion.
lacquer.
(3) Secure. This is usually an external vis-
34. General Precautions in Cleaning
ual inspection or a check by hand or
wrench for looseness. Such an exami-
a. Dry-cleaning solvent is flammable and
nation must include any brackets,
should not be used near an open flame. Fire
lockwashers, locknuts, locking wires,
extinguishers should be provided when these
or cotter pins used.
materials are used. Use only in well-ventilated
(4) Excessively worn. This inspection is to
places.
determine whether equipment is worn
b. Dry cleaning solvent evaporates quickly
beyond serviceable limits or to a point
and has a drying effect on the skin. If used
likely to result in failure if the unit
without gloves, it may cause cracks in the skin
is not replaced before the next sched-
and, in the case of some individuals, a mild ir-
uled inspection.
ritation or inflammation.
c. Avoid getting petroleum products, such as
32. Specific Procedures for Operator
dry cleaning solvent, mineral spirits paint thin-
ner, engine fuels, or lubricants, or rubber parts
Table I lists the specific procedure to be
as they will deteriorate the rubber.
performed on the shop set by the operator
in daily service. An X in a column indicates
d. The use of diesel fuel oil, gasoline, or ben-
zene (benzol) for cleaning is prohibited.
that the procedure opposite it should be per-
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