TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
Page 174 of 1176
TM 9-2320-361-24-1 0010 00 0010 00-14 COMPRESSED AIR AND BRAKE SYSTEM TROUBLESHOOTING (Contd) Table 3. Compressed Air Troubleshooting Procedures (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 2. AIR PRESSURE DOES NOT BUILD UP TO NORMAL OPERATING PRESSURE (ABOVE 85 PSI) ACCORDING TO GAUGE 1. Check for compressed air leaks. 2. Adjust air governor (WP 0183 00). 3. Perform WP 0010, table 3, malfunction 1, test 2. If leak is found, repair or replace compressed air lines or fittings (TM 9-243). 3. AIR PRESSURE EXCEEDS MAXIMUM (GAUGE READS OVER 120 PSI) AND SAFETY VALVE OPENS TO RELEASE AIR PRESSURE 1. Check for air loss through accessories. (Refer to WP 0010 00, table 4, malfunctions 1, 2, and 3). 2. Check governor signal line (4) for bends, or leaks. Test 1. Check governor signal line (4) pressure. 1. Stop engine and open all drain valves (TM 9-2320-361-10) until all air pressure is released from brake system. 2. Disconnect governor signal line (4) from adapter (3). 3. Remove adapter (3) from air governor (2). 4. Install tee (5) on air governor (2). 5. Connect test gauge (1) and governor signal line (4) to tee (5). 6. Direct assistant to start engine (TM 9-2320-361-10) and allow air supply to build up to normal operating pressure. 7. Compare air pressure reading indicated on test gauge (1) to air pressure indicated on instrument panel gauge. 1. If governor signal line (4) is crimped, bent, or leaking, repair or replace governor signal line (4) (TM 9-243). 2. If no restrictions are apparent, proceed to test 1. 1. If test gauge (1) reading is below 85 psi (586 kPa), adjust governor (WP 0183 00). 2. If governor adjustment does not increase governor signal line (4) pressure above 85 psi (586 kPa) on test gauge (1), replace air governor (WP 0183 00).