TM 9-2320-361-20 Table 2-3. Compressed Air and Brake System Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 10. AIR PRESSURE DOES NOT BUILD UP TO NORMAL OPERATING PRESSURE (ABOVE 85 PSI) ACCORDING TO GAGE 11. Step 1. Check for compressed air leaks. If leakage is found, repair or replace compressed air lines or fittings (TM 9-243). Step 2. Adjust air governor (para. 8-29). Step 3. Perform test 2 of malfunction 9. END OF TESTING! NOTE Air pressure gage on instrument panel has a maximum pressure scale of 120 psi. If old governor has been replaced with new governor, air pressure may exceed maximum pressure reading on instrument panel gage. AIR PRESSURE EXCEEDS MAXIMUM (GAGE READS OVER 120 PSI) AND SAFETY VALVE OPENS TO RELEASE PRESSURE Step 1. Step 2. Step 3. Check for air loss through accessories (refer to malfunctions 14, 15, and 16). NOTE Step 2 applies to M275A2 only. Check for excessive air pressure as indicated by instrument panel gage. If air pressure exceeds maximum and safety valve opens to release pressure, replace air governor (para. 8-29. Check governor signal line (4) for crimps, bends, or leaks. a. If governor signal line (4) is crimped, bent, or leaking, repair or replace governor signal line (4) (para. 8-15). b. If no restrictions are apparent, proceed to test 1. Test 1. Check governor signal line (4) pressure. Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. Stop engine and open all draincocks (TM 9-2320-361-10) until brake system air pressure is vented. Disconnect governor signal line (4) from adapter (3). Remove adapter (3) from air governor (2). Install tee (5) on air governor (2). Connect test gage (1) to tee (5) and governor signal line (4) to tee (5). Direct assistant to start engine (TM 9-2320-361-10) and allow air supply to built to normal operating pressure. 2-68