TM 10-4610-232-12
Table 3-1. Operator Troubleshooting Guide (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Distribution pump motor hums but won’t turn with ambient temperature below 32°F (0°C).
Step 1. Check for icing.
Allow pump heater to warm pump for 1 hour.
Step 2. Notify unit maintenance.
4. DISTRIBUTION PUMP circuit breaker opens whenever pump is started.
WARNING
Turn off DISTRIBUTION PUMP circuit breaker and make certain DISTRIBUTION PUMP OFF
pushbutton is pressed and DISTRIBUTION PUMP POWER ON light is not lit before
proceeding. Failure to do so could result in electrocution.
Step 1. Check pump power cable. Clean and dry electrical connectors.
Step 2. Notify unit maintenance.
5. DISTRIBUTION PUMP GROUND FAULT RESET trips repeatedly.
WARNING
Turn off DISTRIBUTION PUMP circuit breaker and make certain DISTRIBUTION PUMP OFF
pushbutton is pressed and DISTRIBUTION PUMP POWER ON light is not lit before
proceeding. Failure to do so could result in electrocution.
Step 1. Check pump power cable. Clean if dirty, dry if wet.
Step 2. Notify unit maintenance.
6. Distribution pump overloads trip repeatedly.
Step 1. Notify unit maintenance.
7. Distribution pump assembly leaks.
Step 1. Notify unit maintenance.
8. Distribution pump/motor assembly is noisy.
Step 1. Notify unit maintenance.
9. Distribution pump runs but does not pump water with ambient temperature above 32°F (0°C).
Step 1. Check storage tanks.
Water must be above suction hose connections.
Step 2. Check for pump air lock.
Remove discharge hoses from pump until water flows out of pump. If water does not come out of
pump discharge do step 3 and also check for plugged suction hoses.
Step 3. Check tank outlet,
[f the tank sidewall hangs over the connection, it maybe blocked by tank fabric. Drain tank out second
connection and check.
Step 4. Notify unit maintenance.
10. Distribution pump runs but does not pump water with ambient temperature below 32°F (0°C).
Step 1.
Step 2.
Step 3.
Step 4.
Refer to steps 1, 2, and 3 of problem #9.
Check dispensing hoses for freezing.
If the hoses are hard or there is ice in the end connections, take hoses inside ROWPU van to thaw out.
Make sure dispensing nozzle is thawed.
Check for ice plugging the suction hoses or inlet of pump.
Remove suction hoses from the pump back to the tanks. Remove any ice plugs found or move hoses
inside ROWPU van to thaw out.
Notify unit maintenance.
11. Distribution pump runs but water discharge pulses.
Step 1. Check storage tanks.
Water must be above level of suction hoses.
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