3-14. MAINTENANCE UNDER UNUSUAL CONDITIONS-Continued.
Metal parts. Metal parts become more brittle and cannot take shock loads at arctic temperatures. Make
frequent inspections of metal areas. Remove corrosion from exterior metal surfaces with abrasive paper
(Appx. D, item 11) or cloth (Appx. D, item 40) and apply a protective coating of paint (Appx. D, item 17, 18,
19, or 20), oil, or suitable rust preventive (Appx. D, item 12 or 13).
Plastic and rubber parts. Any parts made of plastic or rubber materials must be handled carefully. These
become brittle in cold weather and may break due to vibration or handling. To prevent insulation from
cracking and causing short circuits, warm rubber or plastic insulated cables before bending and ensure all
cables are secure in vehicle.
Keep bore of machine gun and firing mechanism covered when not in use to prevent entrance of
Clean bore of machine gun while barrel is still warm, if possible.
Severe damage to weapon might result if recoil mechanism is frozen.
Recoil mechanism may stick unless it is exercised frequently. Refer to FM 23-65 or TM 9-1005-213-
10 for methods of exercising.
Vision devices. Vision devices should not be exposed to sudden changes in temperature. Equipment used
outside at low temperatures should stay outside to avoid fogging.
Extreme Hot Weather Maintenance.
Electrolyte level. In hot climates check electrolyte level daily.
Self-discharge. A battery will self-discharge faster if left standing for long periods in high
temperatures. If vehicle is parked for several days, remove batteries and store in a cool place.