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 2-5 LEAKAGE DEFINITIONS - CONTINUED b. Class II. Leakage of fluid great enough to form drops but not enough to cause drops to drip from item being checked/inspected. c. Class III. Leakage of fluid great enough to form drops that fall from the item being checked/inspected. NOTE M182 only: Leakage of 1 ml (approximately 25 drops) is permissible at the seal interface to the variable recoil rods after five (5) rounds or 24 hours after firing. 2-6 DAMAGE DEFINITIONS Damage definitions are as follows: a. Blowby. Powder markings beyond a sealing surface. b. Burrs. A raised portion, restricting the entrance of a part, component, or assembly. c. Cracks. A narrow break or separation in material. d. Gouges. A groove or cavity in a sealing surface that cannot be repaired. e. Nicks. An indentation caused by object(s) striking the material. Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF-PROPELLED HOWITZER Item No. Interval 1 2 Before Before Location Item to Check/ Service Vehicle Subfloor Drain Plugs and Access Cover Plates DRIVER 2-18 Change 2 Crewmember Procedure DRIVER Walk around vehicle. Check for any obvious fluid leakage, missing items, or damage to equipment. Do not ford if any drain plugs are missing to prevent water damage to equipment. Check all drain plugs (1) and cover plates (2) for installation. Not Fully Mission Capable If: Any Class III oil, fuel, or coolant leak found. Any drain plug (1) or cover plate (2) is missing.