19 After Air dryer Check exhaust port (1) for obstructions Operation such as mud and debris. Clean if (Contd) necessary. 20 Parking brake- drum Check for mud and other debris. Clean as required. ENGINE COMPARTMENT 21 Engine oil level a. Check engine oil level. Do not check oil level with engine running. b. Remove dipstick (2) from dipstick tube (3), wipe clean, and install. Remove dipstick (2) again and check that oil level is in correct position between FULL and ADD marks on dipstick (2). Table 2-2. Operator/Crew Preventive Maintenance Checks and Services (Contd). ITEM NO. INTERVAL ITEM TO CHECK/ SERVICE PROCEDURE NOT FULLY MISSION CAPABLE IF: 2-30 Change 1 TM 9-2320-386-10 NOTE Do not set parking brake after cleaning parking brake drum if temperature is below 32°F (0°C). CAUTION Do not fill above FULL mark on dipstick. Excessively high oil pressures may cause engine damage. WARNING • Hearing protection is required when maintaining vehicle with engine running. • Secure hood in raised position with safety hook before servicing engine. NOTE All fill and check levels are accom- plished with vehicle on level ground. 3 4 2 1