TM 10-4130-237-14
Section IV. UNIT TROUBLESHOOTING
4-7.
UNIT TROUBLESHOOTING. Table 4-2, Troubleshooting, lists common malfunctions which may be found
during normal operation or during an inspection, check procedure, or scheduled testing. Perform the tests/inspections and
corrective actions in order listed. This manual cannot list all malfunctions that may occur or list all tests/inspections and
corrective actions. If a malfunction occurs that is not listed or covered in corrective action, notify your supervisor.
Table 4-2. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE FAILS TO START WITHOUT EXTERNAL POWER OR CRANKS BUT FAILS TO
START WITH EXTERNAL POWER.
Step 1. Disconnect wiring harness, wire number 4, from toggle switch S3, terminal number 2. Try to start water
chiller engine (para 2-6).
If engine starts, turn engine off and reconnect wiring harness, wire number 4 to toggle switch
S3, terminal number 2. Check high and low pressure switches and wiring harness for continuity
(paras 4-29, 4-30 and 4-11). If switches and wiring harness have continuity, notify Direct Sup-
port to check refrigeration.
If engine does not start, proceed with steps 2 through 8 below until engine malfunction has been
corrected and engine starts. Reconnect wiring harness, wire number 4, to toggle switch S3, ter-
minal number 2, and restart engine. Check high and low pressure switches and wiring harness
for continuity (paras 4-29, 4-30 and 4–11). If switches and wiring harness have continuity, no-
tify Direct Support to check refrigeration.
Step 2. Check to see if water supply temperature is below 60°F (16°C) or above 120°F (49°C).
Water chiller is not designed to run if water supply temperature is below 60°F (16°C) or above
120°F (49°C). Do not run water chiller until proper conditions exist.
Step 3. Check fuel line and fuel filter for damage or blockage.
Repair fuel line or replace fuel falter (para 4-39).
Step 4. Check spark plugs for fouling or damage.
Clean or replace spark plugs (para 4-24).
Step 5. Check carburetor for damage, blockage, or proper adjustment.
Replace or adjust carburetor (para 4-21).
Step 6. Test toggle switch S3 (para 4-12).
Replace toggle switch S3 (para 4-12).
4-11
