TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 298 of 890
TM 9-2320-280-20-1 REFERENCE INFORMATION TEMPERATURE-ENVIRONMENT ADJUSTMENT 1. Disconnect battery ground cable. 2. Remove four screws securing regulator to alternator. 3. Position regulator to allow access to the buss bar link. The buss bar link and voltage setting terminals are located under sealant. It maybe necessary to scrape away some of the sealant to access the buss bar link and terminals. 4. To adjust the voltage setting to 27.2 volts (for hot or desert condition), loosen screw E0 and remove screws E1 and E2. Rotate bus bar link to E2. Reinstall screws E1 and E2 and tighten screw E0. 5. Apply RTV sealant to fully cover buss bar link and voltage setting terminals. 6. Install regulator to alternator with four screws. 7. Connect battery ground cable. 8. Check output voltage, it should read 27.2 volts. NOTE To reset alternator output voltage to 28 volts, the buss bar link should be connected between E0 and E1. The terminal connection E0 and E3 provides an output voltage of 28.8 volts (for arctic conditions). When operation in hot weather or arctic conditions cease, the alternator output voltage should be reset to its normal 28.0 volt setting. 9. Mark the output voltage setting on the alternator and annotate the information in the vehicle log book for future reference. NOTE This procedure resets the alternator output approximately 0.8 volts on either side of 28 volts, but will not correct for larger errors. NOTE If an overcharge condition exists, wiring to regulator is satisfactory. ALTERNATOR ENGINE RPM STE/ICE-R TEST 10 1. Start test 10, Engine RPM. 2. Crank or start the engine. Displayed reading is RPM. Engine RPM should be 850. 0-45 DC VOLTS STE/ICE-R TEST 89 1. Connect RED clip to the indicated test point, BLACK clip to negative or ground. 2. Start Test 89, DC volts. 3. Displayed reading is in volts. 2-215