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TM-9-2320-361-24-1 Page 172

TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks

Page 172 of 1176


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TM 9-2320-361-24-1 0010 00 0010 00-12 COMPRESSED AIR AND BRAKE SYSTEM TROUBLESHOOTING (Contd) Table 3. Compressed Air Troubleshooting Procedures (Contd). WARNING • Do not disconnect air lines before draining air reservoirs. Small parts under pressure may shoot out with high velocity, causing injury to personnel. • Wear eyeshields when working with compressed air system. Failure to wear eyeshields may result in injury to personnel. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. NO AIR PRESSURE, OR COMPRESSED AIR READS BELOW 60 PSI (LOW AIR PRESSURE WARNING BUZZER SOUNDING, INDICATING AIR PRESSURE NOT BUILDING UP TO NORMAL OPERATING RANGE AS INDICATED BY GAUGE) 1. Check for missing or loose air compressor drivebelt (3). 2. Check for leaking compressed air lines and fittings. 3. Start engine (TM 9-2320-361-10) and feel compressor outlet line (5). Test 1. Check air reservoirs (1) for air pressure. 1. Start engine (TM 9-2320-361- 10) and allow air pressure to build up to normal operating pressure. 2. Loosen air reservoirs drain valves (2). 3. Check compressor outlet line (5) for restrictions. Test 2. Check for air pressure at air horn supply line (7). 1. Stop engine and open all drain valves (2) (TM 9-2320-361-10) until brake system air pressure is completely drained. 2. Disconnect air horn supply line (7). 3. Connect air horn supply line (7) to test gauge (8). 4. Direct assistant to start engine (TM 9-2320-361-10) and allow air pressure to build up to normal operating pressure. If air compressor drivebelt (3) is missing or loose, replace or adjust drivebelt (3) (WP 0182 00). If leaking, repair or replace compressed air lines or fittings (TM 9-243). 1. If compressor outlet line (5) is hot, proceed to test 1. 2. If compressor outlet line (5) is cool or warm, proceed to test 2. 1. If low amount of air pressure is released, perform step 3. 2. If high amount of air pressure is released, proceed to test 2. 1. If compressor outlet line (5) is restricted, repair or replace (TM 9-243). 2. If compressor outlet line (5) is not restricted, proceed to test 2.