para. 12-41 para. 12-21 TM 9-2320-361-20 Table 2-1. Preventive Maintenance Checks and Services (Contd). S-Semiannually A-Annually B-Biennially Item Interval Item to be No. S A B Inspected 38 • Water separator filter M50A2 AND M50A3 WATER TANK TRUCKS NOTE Refer to TM 9-2320-361-10 for operating procedures when doing the following checks: 39 • Water pump a. Pump enough water from one compartment to another to system and make sure water pump system works properly, and there are no gravity discharge unusual noises, vibrations, or leaks. system Ž b. Gravity discharge water from one compartment to a clean c ontainer. Empty enough water to ensure gravity discharge system works properly and does not leak. 40 • Tank body I nspect manhole covers (4) and filler caps (6) to ensure they seal p roperly and are not damaged. 2-17