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 TM 55-1905-223-24-3
Table 2-2 lists the common fault conditions that may be found during operation or maintenance of the
equipment. Look for causes and do corrective actions in the order listed. This manual cannot list every
symptom that may show up, and it cannot list all of the possible causes and corrective actions. If a symptom is
not listed, or if it keeps up after you have performed the corrective actions, notify your supervisor.
TABLE 2-2. TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
Coolant temperature above normal.
WARNING
Make sure engine is cooled to below 120 (50 ) to avoid burn injury.
F
C
STEP 1. Check if coolant level is low.
Add coolant as required. Refer to PMCS Item 5.
STEP 2. Check function of shutoff valves on either side of the water filter.
Make sure they are completely open, counterclockwise, (para. 2-27).
STEP 3. Check for collapsed or restricted hoses (refer to PMCS Table 2-1, Item 2).
Replace hoses as needed (paras. 2-27 and 2-28).
STEP 4. Check if water pump belt is loose.
Check belt tension and tighten if necessary (para. 2-33).
STEP 5. Check if oil level is incorrect.
Add or drain engine oil. Refer to PMCS Table 2-1, Items 4 and 15.
STEP 6. Check if pressure cap on remove expansion tank is incorrect or malfunctioning.
Check the gasket on expansion tank fill cap (TM 55-1905-223-24-18).
STEP
7.
Check if temperature gauge is malfunctioning.
a.
Test the gauge as follows:
(1)
Check for a blown fuse.
(2)
Check the wiring from the gauge to the sending unit for a broken connection.
(3)
Check the temperature sending unit in the front upper water manifold.
(4)
Use a temperature gauge of known accuracy to check system.
(5)
Replace faulty gauge (para. 2-26).
2-24
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