TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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TM 9-2320-280-20-1 1. Start Test 10, Engine RPM. 2. Crank or start the engine. Displayed reading is RPM. Cranking RPM should be at least 100. Idle RPM should be 625 - 675. ENGINE RPM STE/ICE-R TEST 10 REFERENCE INFORMATION ALTERNATOR Change 1 2-199 If the engine doesn't start on its own power, you should check the battery and starter circuits. NOTES ON IDLE ADJUSTMENT If idle can be adjusted to within limits, go to step 5. If idle CANNOT be adjusted to within limits, you may have a problem with the fuel system. You can either continue here or run the fuel system tests and return here. BATTERY VOLTAGE STE/ICE-R TEST 67 1. Start Test 67, battery voltage. 2. Displayed reading is in volts. Batteries should be 23-25.5 volts. Battery voltage will drop when glowplugs turn on. NOTES Check the wiring and the pins at sockets E & F at PCB/distribution box engine connector. Check the wiring and the pins at sockets D & G at PCB/distribution box body connector. Check and clean starter solenoid and battery box power stud. Check and clean battery cables and clamps. Look for loose, dirty, or broken connections and repair as necessary. If terminal voltage is still low, harness should be replaced. Notify DS maintenance. 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. 0-45 DC VOLTS STE/ICE-R TEST 89 A charged battery in good condition is a prerequisite for testing an alternator/regulator system. If battery is suspect, substitute a known good battery in the vehicle. Output for 60 amp alternator is wire 5A and stud. All other alternators have a large stud on side of housing as output terminal to connect wire 6. NOTE