TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
END OF TESTING!
AIR-OPERATED ACCESSORIES
20. ALL AIR-OPERATED ACCESSORIES DO NOT OPERATE (HORN, WINDSHIELD WIPERS, WINDSHIELD WASHERS,
TRANSFER CASE CONTROLS), GAUGES AT NORMAL OPERATING PRESSURE
Check air pressure gauges on instrument panel.
a. If air gauges indicate normal operating pressure, defect is in air lines between the
governor and accessories or in accessories themselves.
b. If gauges indicate excessive air pressure, replace pressure protection valve
END OF TESTING!
21. COOLING FAN DOES NOT OPERATE, ENGINE TEMPERATURE ABOVE 200F (93C) AS INDICATED BY
TEMPERATURE GAUGE
Test 1. Check availability of air as indicated on secondary air system pressure gauge.
If air pressure is below normal operating pressure, perform malfunction 14.
Test 2. Check temperature gauge for proper operation. See Electrical Troubleshooting, para. 2-22.
Test 3. Check fan drive clutch actuator for proper operation.
a. Remove and replace fan drive clutch actuator with one known to be good (para. 3-73
or 3-74).
b. If fan remains inoperative, notify DS maintenance.
END OF TESTING!
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