TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9--2350--311--10 2--271 Section IV. OPERATION UNDER UNUSUAL CONDITIONS 2--19 GENERAL NOTE FM 21--17 contains important instructions on driver selection, training, and supervision. FM 21--306 gives driving instructions for operating your equipment under all conditions. a. Vehicle In addition to the normal PMCS, special care in cleaning and lubrication must be observed where extremes of temperature, humidity, and terrain conditions are present or anticipated. b. General Lubrication of Armament CAUTION During lubrication of armament, be extremely cautious not to allow ice, snow, or water to mix with lubricants. Never use heavy or non-specified lubricants. 1 Refer to Appendix G for detailed lubrication instructions. 2 In temperatures below freezing, keep the howitzer’s moving parts free from moisture. 3 During adverse conditions, lubricants should be changed more frequently to prevent damage to the equipment. c. Primary Armament When not in use, howitzer should be covered. Clean and lightly lubricate breech mechanism. Do not apply any lubrication to the firing pin. When cleaning, do not dilute or add antifreeze to CLP. Store cleaning solutions in a warm place, if available. d. Secondary Armament The unusual conditions procedures for secondary armament are the same as operation under usual conditions. Use CLP (item 8, Appx D) in cleaning and lubricating the M2 .50 caliber machine gun to ensure proper functioning. e. Sighting and Fire Control Instruments Where extremes of temperature, humidity, and other conditions cause panoramic telescope ballistic cover to fog over, treat window with anti-fogging kit (item 2, Appx D). These instruments should not be moved suddenly from cold to warm temperatures or vice versa. This may cause clouding of optics and rusting of internal parts.