TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0020 00 0020 00-17 LUBRICATION INSTRUCTIONS (Contd) NOTES 1. Fuel Filters Drain primary fuel filter. If fuel filter contains dirt or water, drain secondary and final filters. If dirt or water is found in final filter, notify organizational maintenance. Replace primary and secondary filter elements and gaskets every 6,000 mi (9,656 km), 12 months, or whichever occurs first, or at the discretion of the Maintenance Officer, as local conditions warrant. Change final fuel filter during engine overhaul/rebuild or during troubleshooting. Do not drain filters completely. 2. Fuel Filter Replace fuel filter every 6,000 mi (9,656 km) or 12 months, whichever occurs first. 3. Oil Filter Remove filter drain plug and elements; clean inside of filter case and reinstall drain plug, new elements, and gaskets. Oil filters must be serviced, changed, or cleaned when: 1. They are clogged or known to be contaminated. 2. Prescribed hard-time intervals are reached. 4. Crankcase To check engine oil level, wait at least one minute after shutting down engine to allow oil to drain into crankcase. Safe operating level is between ADD and FULL on the dipstick. Adjust oil level accordingly. When vehicle or engine is placed in storage other than administrative storage, service the crankcase with grade 30 engine oil conforming to specification MIL-PRF-21260, Lubricating Oil, Internal Combustion Engine, Preservative and Break-In. MIL-PRF-21260 engine oil is an operational lubricant and may be used until the initial scheduled oil change after reactivation of the vehicle or engine. For administrative storage, engine oil conforming to the specification and grade established should be used. 5. Gear Cases Change gear lubricant only when required by maintenance repair action, or if contaminated by water or other foreign material. Check lubricant for proper level and for contamination annually. Drain only when unit is hot after operation. At axle differentials, transfer case and transmission; check fluid level within 1/2-in. (12.70 mm) of level plug opening. The level in the winch end bearing frame housing on the right side is 6-7/8 inches (174.62 mm) below filter plug. Use the full level plug located on the left side of the winch worm housing to check lubrication level. At the time of a scheduled lubrication, a gear housing lubricant retaining seal that indicates questionable leakage may be considered functional if a safe level of lubricant is present in the gear housing. Questionable leaks that may indicate a potential problem area may be subject to frequent observation. When seepage or leakage of lubricant adversely affects the proper function of parts within the area (e.g. brakes), the retaining seal is non-functional regardless of lubricant level.