TM9-2330-207-14
Section XV. MAINTENANCE UNDER UNUSUAL CONDITIONS
Page
Page
Extreme Cold Weather Maintenance
Maintenance After Fording
Maintenance After Operation on Unusual
Extreme Hot Weather Maintenance
Terrain
4-78. EXTREME COLD WEATHER MAINTENANCE
a. The importance of maintenance must be impressed on all concerned. Maintenance of mechanical equip-
ment in extreme cold is exceptionally difficult in the field. Even shop maintenance cannot be completed
with normal speed because the equipment must be allowed to thaw out and warm up before the mechanic
can make satisfactory repairs. In the field, maintenance must be undertaken under the most difficult of
conditions. Bare hands stick to cold metal. Fuel in contact with the hands results in supercooling due to
evaporation, and the hands can be painfully frozen in a matter of minutes. Engine oils, except subzero grade,
are unpourable at temperatures below -40 F. Ordinary greases become as solid as cold butter.
b. These difficulties increase the time required to perform maintenance. At temperatures below -400F.,
maintenance requires up to five times the normal amount of time. Complete winterization, diligent mainte-
nance, and well-trained crews are the key to effecient Arctic-winter operation.
c. Refer to FM 9-207 for general information on extreme cold weather maintenance procedures.
It is imperative that the approved maintenance procedures be followed.
FM 9-207 contains general information which is specifically applicable
to this materiel as well as all other materiel. It must be considered an
essential part of this technical manual, not merely an explanatory
supplement to it.
4-79. EXTREME HOT WEATHER MAINTENANCE
a. Corrosion. In hot, damp climates, corrosive action will occur on all parts of the materiel and will be
accelerated during rainy seasons. Evidence will appear in the form of rust, paint blisters, mildew, mold and
fungus growth.
b. Protective Action. Remove the corrosion from exterior metal surfaces with abrasive paper or cloth
and apply a protective coating of paint, or touch up the existing paint. Keep a film of preservative oil,
(item 14 or 15, Appendix C) on unfinished exposed metal surfaces. Cables and terminals should be pro-
tected by spraying with ignition insulation compound.
4-80. MAINTENANCE AFTER FORDING
a. General. Although the materiel unit housings are sealed to prevent the free flow of water into the
housings, it must be realized that due to the necessary design of these assemblies, some water may enter,
especially during submersion. The following services should be accomplished on all materiel which has been
exposed to some depth of water or completely submerged, especially in salt water. Precautions should be
taken as soon as practicable to halt deterioration and avoid damage before the materiel is driven extensively
in reguIar service.
b. Lubricate. Clean and lubricate all parts as specified on the lubrication chart. Remove wheels; clean and
repack bearings. Make sure that lubricant is generously forced into each lubrication fitting to force out any
water present.
